├── .gitignore ├── .mvn └── wrapper │ ├── MavenWrapperDownloader.java │ ├── maven-wrapper.jar │ └── maven-wrapper.properties ├── LICENSE ├── README.md ├── mvnw ├── mvnw.cmd ├── pom.xml └── src ├── main ├── java │ └── com │ │ └── web │ │ └── client │ │ └── demo │ │ ├── DemoApplication.java │ │ ├── config │ │ └── WebClientConfiguration.java │ │ ├── model │ │ └── User.java │ │ └── service │ │ └── UserService.java └── resources │ └── application.properties └── test └── java └── com └── web └── client └── demo ├── DemoApplicationTests.java └── service ├── UserServiceMockWebServerTest.java └── UserServiceMockitoTest.java /.gitignore: -------------------------------------------------------------------------------- 1 | HELP.md 2 | target/ 3 | !.mvn/wrapper/maven-wrapper.jar 4 | !**/src/main/**/target/ 5 | !**/src/test/**/target/ 6 | 7 | ### STS ### 8 | .apt_generated 9 | .classpath 10 | .factorypath 11 | .project 12 | .settings 13 | .springBeans 14 | .sts4-cache 15 | 16 | ### IntelliJ IDEA ### 17 | .idea 18 | *.iws 19 | *.iml 20 | *.ipr 21 | 22 | ### NetBeans ### 23 | /nbproject/private/ 24 | /nbbuild/ 25 | /dist/ 26 | /nbdist/ 27 | /.nb-gradle/ 28 | build/ 29 | !**/src/main/**/build/ 30 | !**/src/test/**/build/ 31 | 32 | ### VS Code ### 33 | .vscode/ 34 | -------------------------------------------------------------------------------- /.mvn/wrapper/MavenWrapperDownloader.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2007-present the original author or authors. 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * https://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | import java.net.*; 17 | import java.io.*; 18 | import java.nio.channels.*; 19 | import java.util.Properties; 20 | 21 | public class MavenWrapperDownloader { 22 | 23 | private static final String WRAPPER_VERSION = "0.5.6"; 24 | /** 25 | * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided. 26 | */ 27 | private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/" 28 | + WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar"; 29 | 30 | /** 31 | * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to 32 | * use instead of the default one. 33 | */ 34 | private static final String MAVEN_WRAPPER_PROPERTIES_PATH = 35 | ".mvn/wrapper/maven-wrapper.properties"; 36 | 37 | /** 38 | * Path where the maven-wrapper.jar will be saved to. 39 | */ 40 | private static final String MAVEN_WRAPPER_JAR_PATH = 41 | ".mvn/wrapper/maven-wrapper.jar"; 42 | 43 | /** 44 | * Name of the property which should be used to override the default download url for the wrapper. 45 | */ 46 | private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl"; 47 | 48 | public static void main(String args[]) { 49 | System.out.println("- Downloader started"); 50 | File baseDirectory = new File(args[0]); 51 | System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath()); 52 | 53 | // If the maven-wrapper.properties exists, read it and check if it contains a custom 54 | // wrapperUrl parameter. 55 | File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH); 56 | String url = DEFAULT_DOWNLOAD_URL; 57 | if(mavenWrapperPropertyFile.exists()) { 58 | FileInputStream mavenWrapperPropertyFileInputStream = null; 59 | try { 60 | mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile); 61 | Properties mavenWrapperProperties = new Properties(); 62 | mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream); 63 | url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url); 64 | } catch (IOException e) { 65 | System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'"); 66 | } finally { 67 | try { 68 | if(mavenWrapperPropertyFileInputStream != null) { 69 | mavenWrapperPropertyFileInputStream.close(); 70 | } 71 | } catch (IOException e) { 72 | // Ignore ... 73 | } 74 | } 75 | } 76 | System.out.println("- Downloading from: " + url); 77 | 78 | File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH); 79 | if(!outputFile.getParentFile().exists()) { 80 | if(!outputFile.getParentFile().mkdirs()) { 81 | System.out.println( 82 | "- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'"); 83 | } 84 | } 85 | System.out.println("- Downloading to: " + outputFile.getAbsolutePath()); 86 | try { 87 | downloadFileFromURL(url, outputFile); 88 | System.out.println("Done"); 89 | System.exit(0); 90 | } catch (Throwable e) { 91 | System.out.println("- Error downloading"); 92 | e.printStackTrace(); 93 | System.exit(1); 94 | } 95 | } 96 | 97 | private static void downloadFileFromURL(String urlString, File destination) throws Exception { 98 | if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) { 99 | String username = System.getenv("MVNW_USERNAME"); 100 | char[] password = System.getenv("MVNW_PASSWORD").toCharArray(); 101 | Authenticator.setDefault(new Authenticator() { 102 | @Override 103 | protected PasswordAuthentication getPasswordAuthentication() { 104 | return new PasswordAuthentication(username, password); 105 | } 106 | }); 107 | } 108 | URL website = new URL(urlString); 109 | ReadableByteChannel rbc; 110 | rbc = Channels.newChannel(website.openStream()); 111 | FileOutputStream fos = new FileOutputStream(destination); 112 | fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE); 113 | fos.close(); 114 | rbc.close(); 115 | } 116 | 117 | } 118 | -------------------------------------------------------------------------------- /.mvn/wrapper/maven-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/stanislaw-wein/spring-boot-web-client-examples/f10639ffe17de87f593b85a337f489e80a702648/.mvn/wrapper/maven-wrapper.jar -------------------------------------------------------------------------------- /.mvn/wrapper/maven-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip 2 | wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar 3 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [2021] [Stanislav Vain] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## Medium Article 2 | 3 | [Spring Boot WebClient Cheat Sheet](https://medium.com/swlh/spring-boot-webclient-cheat-sheet-5be26cfa3e) 4 | 5 | -------------------------------------------------------------------------------- /mvnw: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | # ---------------------------------------------------------------------------- 3 | # Licensed to the Apache Software Foundation (ASF) under one 4 | # or more contributor license agreements. See the NOTICE file 5 | # distributed with this work for additional information 6 | # regarding copyright ownership. The ASF licenses this file 7 | # to you under the Apache License, Version 2.0 (the 8 | # "License"); you may not use this file except in compliance 9 | # with the License. You may obtain a copy of the License at 10 | # 11 | # https://www.apache.org/licenses/LICENSE-2.0 12 | # 13 | # Unless required by applicable law or agreed to in writing, 14 | # software distributed under the License is distributed on an 15 | # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 | # KIND, either express or implied. See the License for the 17 | # specific language governing permissions and limitations 18 | # under the License. 19 | # ---------------------------------------------------------------------------- 20 | 21 | # ---------------------------------------------------------------------------- 22 | # Maven Start Up Batch script 23 | # 24 | # Required ENV vars: 25 | # ------------------ 26 | # JAVA_HOME - location of a JDK home dir 27 | # 28 | # Optional ENV vars 29 | # ----------------- 30 | # M2_HOME - location of maven2's installed home dir 31 | # MAVEN_OPTS - parameters passed to the Java VM when running Maven 32 | # e.g. to debug Maven itself, use 33 | # set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 34 | # MAVEN_SKIP_RC - flag to disable loading of mavenrc files 35 | # ---------------------------------------------------------------------------- 36 | 37 | if [ -z "$MAVEN_SKIP_RC" ] ; then 38 | 39 | if [ -f /etc/mavenrc ] ; then 40 | . /etc/mavenrc 41 | fi 42 | 43 | if [ -f "$HOME/.mavenrc" ] ; then 44 | . "$HOME/.mavenrc" 45 | fi 46 | 47 | fi 48 | 49 | # OS specific support. $var _must_ be set to either true or false. 50 | cygwin=false; 51 | darwin=false; 52 | mingw=false 53 | case "`uname`" in 54 | CYGWIN*) cygwin=true ;; 55 | MINGW*) mingw=true;; 56 | Darwin*) darwin=true 57 | # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home 58 | # See https://developer.apple.com/library/mac/qa/qa1170/_index.html 59 | if [ -z "$JAVA_HOME" ]; then 60 | if [ -x "/usr/libexec/java_home" ]; then 61 | export JAVA_HOME="`/usr/libexec/java_home`" 62 | else 63 | export JAVA_HOME="/Library/Java/Home" 64 | fi 65 | fi 66 | ;; 67 | esac 68 | 69 | if [ -z "$JAVA_HOME" ] ; then 70 | if [ -r /etc/gentoo-release ] ; then 71 | JAVA_HOME=`java-config --jre-home` 72 | fi 73 | fi 74 | 75 | if [ -z "$M2_HOME" ] ; then 76 | ## resolve links - $0 may be a link to maven's home 77 | PRG="$0" 78 | 79 | # need this for relative symlinks 80 | while [ -h "$PRG" ] ; do 81 | ls=`ls -ld "$PRG"` 82 | link=`expr "$ls" : '.*-> \(.*\)$'` 83 | if expr "$link" : '/.*' > /dev/null; then 84 | PRG="$link" 85 | else 86 | PRG="`dirname "$PRG"`/$link" 87 | fi 88 | done 89 | 90 | saveddir=`pwd` 91 | 92 | M2_HOME=`dirname "$PRG"`/.. 93 | 94 | # make it fully qualified 95 | M2_HOME=`cd "$M2_HOME" && pwd` 96 | 97 | cd "$saveddir" 98 | # echo Using m2 at $M2_HOME 99 | fi 100 | 101 | # For Cygwin, ensure paths are in UNIX format before anything is touched 102 | if $cygwin ; then 103 | [ -n "$M2_HOME" ] && 104 | M2_HOME=`cygpath --unix "$M2_HOME"` 105 | [ -n "$JAVA_HOME" ] && 106 | JAVA_HOME=`cygpath --unix "$JAVA_HOME"` 107 | [ -n "$CLASSPATH" ] && 108 | CLASSPATH=`cygpath --path --unix "$CLASSPATH"` 109 | fi 110 | 111 | # For Mingw, ensure paths are in UNIX format before anything is touched 112 | if $mingw ; then 113 | [ -n "$M2_HOME" ] && 114 | M2_HOME="`(cd "$M2_HOME"; pwd)`" 115 | [ -n "$JAVA_HOME" ] && 116 | JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`" 117 | fi 118 | 119 | if [ -z "$JAVA_HOME" ]; then 120 | javaExecutable="`which javac`" 121 | if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then 122 | # readlink(1) is not available as standard on Solaris 10. 123 | readLink=`which readlink` 124 | if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then 125 | if $darwin ; then 126 | javaHome="`dirname \"$javaExecutable\"`" 127 | javaExecutable="`cd \"$javaHome\" && pwd -P`/javac" 128 | else 129 | javaExecutable="`readlink -f \"$javaExecutable\"`" 130 | fi 131 | javaHome="`dirname \"$javaExecutable\"`" 132 | javaHome=`expr "$javaHome" : '\(.*\)/bin'` 133 | JAVA_HOME="$javaHome" 134 | export JAVA_HOME 135 | fi 136 | fi 137 | fi 138 | 139 | if [ -z "$JAVACMD" ] ; then 140 | if [ -n "$JAVA_HOME" ] ; then 141 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 142 | # IBM's JDK on AIX uses strange locations for the executables 143 | JAVACMD="$JAVA_HOME/jre/sh/java" 144 | else 145 | JAVACMD="$JAVA_HOME/bin/java" 146 | fi 147 | else 148 | JAVACMD="`which java`" 149 | fi 150 | fi 151 | 152 | if [ ! -x "$JAVACMD" ] ; then 153 | echo "Error: JAVA_HOME is not defined correctly." >&2 154 | echo " We cannot execute $JAVACMD" >&2 155 | exit 1 156 | fi 157 | 158 | if [ -z "$JAVA_HOME" ] ; then 159 | echo "Warning: JAVA_HOME environment variable is not set." 160 | fi 161 | 162 | CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher 163 | 164 | # traverses directory structure from process work directory to filesystem root 165 | # first directory with .mvn subdirectory is considered project base directory 166 | find_maven_basedir() { 167 | 168 | if [ -z "$1" ] 169 | then 170 | echo "Path not specified to find_maven_basedir" 171 | return 1 172 | fi 173 | 174 | basedir="$1" 175 | wdir="$1" 176 | while [ "$wdir" != '/' ] ; do 177 | if [ -d "$wdir"/.mvn ] ; then 178 | basedir=$wdir 179 | break 180 | fi 181 | # workaround for JBEAP-8937 (on Solaris 10/Sparc) 182 | if [ -d "${wdir}" ]; then 183 | wdir=`cd "$wdir/.."; pwd` 184 | fi 185 | # end of workaround 186 | done 187 | echo "${basedir}" 188 | } 189 | 190 | # concatenates all lines of a file 191 | concat_lines() { 192 | if [ -f "$1" ]; then 193 | echo "$(tr -s '\n' ' ' < "$1")" 194 | fi 195 | } 196 | 197 | BASE_DIR=`find_maven_basedir "$(pwd)"` 198 | if [ -z "$BASE_DIR" ]; then 199 | exit 1; 200 | fi 201 | 202 | ########################################################################################## 203 | # Extension to allow automatically downloading the maven-wrapper.jar from Maven-central 204 | # This allows using the maven wrapper in projects that prohibit checking in binary data. 205 | ########################################################################################## 206 | if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then 207 | if [ "$MVNW_VERBOSE" = true ]; then 208 | echo "Found .mvn/wrapper/maven-wrapper.jar" 209 | fi 210 | else 211 | if [ "$MVNW_VERBOSE" = true ]; then 212 | echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..." 213 | fi 214 | if [ -n "$MVNW_REPOURL" ]; then 215 | jarUrl="$MVNW_REPOURL/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar" 216 | else 217 | jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar" 218 | fi 219 | while IFS="=" read key value; do 220 | case "$key" in (wrapperUrl) jarUrl="$value"; break ;; 221 | esac 222 | done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties" 223 | if [ "$MVNW_VERBOSE" = true ]; then 224 | echo "Downloading from: $jarUrl" 225 | fi 226 | wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" 227 | if $cygwin; then 228 | wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"` 229 | fi 230 | 231 | if command -v wget > /dev/null; then 232 | if [ "$MVNW_VERBOSE" = true ]; then 233 | echo "Found wget ... using wget" 234 | fi 235 | if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then 236 | wget "$jarUrl" -O "$wrapperJarPath" 237 | else 238 | wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" 239 | fi 240 | elif command -v curl > /dev/null; then 241 | if [ "$MVNW_VERBOSE" = true ]; then 242 | echo "Found curl ... using curl" 243 | fi 244 | if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then 245 | curl -o "$wrapperJarPath" "$jarUrl" -f 246 | else 247 | curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f 248 | fi 249 | 250 | else 251 | if [ "$MVNW_VERBOSE" = true ]; then 252 | echo "Falling back to using Java to download" 253 | fi 254 | javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java" 255 | # For Cygwin, switch paths to Windows format before running javac 256 | if $cygwin; then 257 | javaClass=`cygpath --path --windows "$javaClass"` 258 | fi 259 | if [ -e "$javaClass" ]; then 260 | if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then 261 | if [ "$MVNW_VERBOSE" = true ]; then 262 | echo " - Compiling MavenWrapperDownloader.java ..." 263 | fi 264 | # Compiling the Java class 265 | ("$JAVA_HOME/bin/javac" "$javaClass") 266 | fi 267 | if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then 268 | # Running the downloader 269 | if [ "$MVNW_VERBOSE" = true ]; then 270 | echo " - Running MavenWrapperDownloader.java ..." 271 | fi 272 | ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR") 273 | fi 274 | fi 275 | fi 276 | fi 277 | ########################################################################################## 278 | # End of extension 279 | ########################################################################################## 280 | 281 | export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"} 282 | if [ "$MVNW_VERBOSE" = true ]; then 283 | echo $MAVEN_PROJECTBASEDIR 284 | fi 285 | MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS" 286 | 287 | # For Cygwin, switch paths to Windows format before running java 288 | if $cygwin; then 289 | [ -n "$M2_HOME" ] && 290 | M2_HOME=`cygpath --path --windows "$M2_HOME"` 291 | [ -n "$JAVA_HOME" ] && 292 | JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"` 293 | [ -n "$CLASSPATH" ] && 294 | CLASSPATH=`cygpath --path --windows "$CLASSPATH"` 295 | [ -n "$MAVEN_PROJECTBASEDIR" ] && 296 | MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"` 297 | fi 298 | 299 | # Provide a "standardized" way to retrieve the CLI args that will 300 | # work with both Windows and non-Windows executions. 301 | MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@" 302 | export MAVEN_CMD_LINE_ARGS 303 | 304 | WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain 305 | 306 | exec "$JAVACMD" \ 307 | $MAVEN_OPTS \ 308 | -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \ 309 | "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \ 310 | ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@" 311 | -------------------------------------------------------------------------------- /mvnw.cmd: -------------------------------------------------------------------------------- 1 | @REM ---------------------------------------------------------------------------- 2 | @REM Licensed to the Apache Software Foundation (ASF) under one 3 | @REM or more contributor license agreements. See the NOTICE file 4 | @REM distributed with this work for additional information 5 | @REM regarding copyright ownership. The ASF licenses this file 6 | @REM to you under the Apache License, Version 2.0 (the 7 | @REM "License"); you may not use this file except in compliance 8 | @REM with the License. You may obtain a copy of the License at 9 | @REM 10 | @REM https://www.apache.org/licenses/LICENSE-2.0 11 | @REM 12 | @REM Unless required by applicable law or agreed to in writing, 13 | @REM software distributed under the License is distributed on an 14 | @REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 | @REM KIND, either express or implied. See the License for the 16 | @REM specific language governing permissions and limitations 17 | @REM under the License. 18 | @REM ---------------------------------------------------------------------------- 19 | 20 | @REM ---------------------------------------------------------------------------- 21 | @REM Maven Start Up Batch script 22 | @REM 23 | @REM Required ENV vars: 24 | @REM JAVA_HOME - location of a JDK home dir 25 | @REM 26 | @REM Optional ENV vars 27 | @REM M2_HOME - location of maven2's installed home dir 28 | @REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands 29 | @REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending 30 | @REM MAVEN_OPTS - parameters passed to the Java VM when running Maven 31 | @REM e.g. to debug Maven itself, use 32 | @REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 33 | @REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files 34 | @REM ---------------------------------------------------------------------------- 35 | 36 | @REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on' 37 | @echo off 38 | @REM set title of command window 39 | title %0 40 | @REM enable echoing by setting MAVEN_BATCH_ECHO to 'on' 41 | @if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO% 42 | 43 | @REM set %HOME% to equivalent of $HOME 44 | if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%") 45 | 46 | @REM Execute a user defined script before this one 47 | if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre 48 | @REM check for pre script, once with legacy .bat ending and once with .cmd ending 49 | if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat" 50 | if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd" 51 | :skipRcPre 52 | 53 | @setlocal 54 | 55 | set ERROR_CODE=0 56 | 57 | @REM To isolate internal variables from possible post scripts, we use another setlocal 58 | @setlocal 59 | 60 | @REM ==== START VALIDATION ==== 61 | if not "%JAVA_HOME%" == "" goto OkJHome 62 | 63 | echo. 64 | echo Error: JAVA_HOME not found in your environment. >&2 65 | echo Please set the JAVA_HOME variable in your environment to match the >&2 66 | echo location of your Java installation. >&2 67 | echo. 68 | goto error 69 | 70 | :OkJHome 71 | if exist "%JAVA_HOME%\bin\java.exe" goto init 72 | 73 | echo. 74 | echo Error: JAVA_HOME is set to an invalid directory. >&2 75 | echo JAVA_HOME = "%JAVA_HOME%" >&2 76 | echo Please set the JAVA_HOME variable in your environment to match the >&2 77 | echo location of your Java installation. >&2 78 | echo. 79 | goto error 80 | 81 | @REM ==== END VALIDATION ==== 82 | 83 | :init 84 | 85 | @REM Find the project base dir, i.e. the directory that contains the folder ".mvn". 86 | @REM Fallback to current working directory if not found. 87 | 88 | set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR% 89 | IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir 90 | 91 | set EXEC_DIR=%CD% 92 | set WDIR=%EXEC_DIR% 93 | :findBaseDir 94 | IF EXIST "%WDIR%"\.mvn goto baseDirFound 95 | cd .. 96 | IF "%WDIR%"=="%CD%" goto baseDirNotFound 97 | set WDIR=%CD% 98 | goto findBaseDir 99 | 100 | :baseDirFound 101 | set MAVEN_PROJECTBASEDIR=%WDIR% 102 | cd "%EXEC_DIR%" 103 | goto endDetectBaseDir 104 | 105 | :baseDirNotFound 106 | set MAVEN_PROJECTBASEDIR=%EXEC_DIR% 107 | cd "%EXEC_DIR%" 108 | 109 | :endDetectBaseDir 110 | 111 | IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig 112 | 113 | @setlocal EnableExtensions EnableDelayedExpansion 114 | for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a 115 | @endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS% 116 | 117 | :endReadAdditionalConfig 118 | 119 | SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe" 120 | set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar" 121 | set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain 122 | 123 | set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar" 124 | 125 | FOR /F "tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO ( 126 | IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B 127 | ) 128 | 129 | @REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central 130 | @REM This allows using the maven wrapper in projects that prohibit checking in binary data. 131 | if exist %WRAPPER_JAR% ( 132 | if "%MVNW_VERBOSE%" == "true" ( 133 | echo Found %WRAPPER_JAR% 134 | ) 135 | ) else ( 136 | if not "%MVNW_REPOURL%" == "" ( 137 | SET DOWNLOAD_URL="%MVNW_REPOURL%/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar" 138 | ) 139 | if "%MVNW_VERBOSE%" == "true" ( 140 | echo Couldn't find %WRAPPER_JAR%, downloading it ... 141 | echo Downloading from: %DOWNLOAD_URL% 142 | ) 143 | 144 | powershell -Command "&{"^ 145 | "$webclient = new-object System.Net.WebClient;"^ 146 | "if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^ 147 | "$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^ 148 | "}"^ 149 | "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^ 150 | "}" 151 | if "%MVNW_VERBOSE%" == "true" ( 152 | echo Finished downloading %WRAPPER_JAR% 153 | ) 154 | ) 155 | @REM End of extension 156 | 157 | @REM Provide a "standardized" way to retrieve the CLI args that will 158 | @REM work with both Windows and non-Windows executions. 159 | set MAVEN_CMD_LINE_ARGS=%* 160 | 161 | %MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %* 162 | if ERRORLEVEL 1 goto error 163 | goto end 164 | 165 | :error 166 | set ERROR_CODE=1 167 | 168 | :end 169 | @endlocal & set ERROR_CODE=%ERROR_CODE% 170 | 171 | if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost 172 | @REM check for post script, once with legacy .bat ending and once with .cmd ending 173 | if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat" 174 | if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd" 175 | :skipRcPost 176 | 177 | @REM pause the script if MAVEN_BATCH_PAUSE is set to 'on' 178 | if "%MAVEN_BATCH_PAUSE%" == "on" pause 179 | 180 | if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE% 181 | 182 | exit /B %ERROR_CODE% 183 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | demo 6 | 7 | 8 | 9 | spring-boot-maven-plugin 10 | 11 | 12 | 13 | lombok 14 | org.projectlombok 15 | 16 | 17 | 18 | org.springframework.boot 19 | 20 | 21 | 22 | 23 | 24 | spring-boot-starter-webflux 25 | org.springframework.boot 26 | 27 | 28 | 29 | lombok 30 | org.projectlombok 31 | true 32 | 33 | 34 | spring-boot-starter-test 35 | org.springframework.boot 36 | test 37 | 38 | 39 | reactor-test 40 | io.projectreactor 41 | test 42 | 43 | 44 | 45 | mockwebserver 46 | com.squareup.okhttp3 47 | test 48 | 4.10.0 49 | 50 | 51 | okhttp 52 | com.squareup.okhttp3 53 | 4.10.0 54 | 55 | 56 | 57 | 58 | mockito-core 59 | org.mockito 60 | test 61 | 5.2.0 62 | 63 | 64 | mockito-junit-jupiter 65 | org.mockito 66 | test 67 | 5.2.0 68 | 69 | 70 | 71 | Demo project for Spring Boot 72 | com.example 73 | 4.0.0 74 | demo 75 | 76 | spring-boot-starter-parent 77 | org.springframework.boot 78 | 79 | 3.0.0-SNAPSHOT 80 | 81 | 82 | 83 | spring-milestones 84 | Spring Milestones 85 | 86 | false 87 | 88 | https://repo.spring.io/milestone 89 | 90 | 91 | spring-snapshots 92 | Spring Snapshots 93 | 94 | false 95 | 96 | https://repo.spring.io/snapshot 97 | 98 | 99 | 100 | 101 | 17 102 | 103 | 104 | 105 | spring-milestones 106 | Spring Milestones 107 | 108 | false 109 | 110 | https://repo.spring.io/milestone 111 | 112 | 113 | spring-snapshots 114 | Spring Snapshots 115 | 116 | false 117 | 118 | https://repo.spring.io/snapshot 119 | 120 | 121 | 0.0.2-SNAPSHOT 122 | 123 | 124 | -------------------------------------------------------------------------------- /src/main/java/com/web/client/demo/DemoApplication.java: -------------------------------------------------------------------------------- 1 | package com.web.client.demo; 2 | 3 | import com.web.client.demo.service.UserService; 4 | import lombok.AllArgsConstructor; 5 | import lombok.extern.slf4j.Slf4j; 6 | import org.springframework.boot.CommandLineRunner; 7 | import org.springframework.boot.SpringApplication; 8 | import org.springframework.boot.autoconfigure.SpringBootApplication; 9 | 10 | @SpringBootApplication 11 | @Slf4j 12 | @AllArgsConstructor 13 | public class DemoApplication implements CommandLineRunner { 14 | 15 | private final UserService userService; 16 | 17 | public static void main(String[] args) { 18 | SpringApplication.run(DemoApplication.class, args); 19 | } 20 | 21 | @Override 22 | public void run(final String... args) { 23 | userService 24 | .getUserByIdAsync("1") 25 | .subscribe(user -> log.info("Get user async: {}", user)); 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /src/main/java/com/web/client/demo/config/WebClientConfiguration.java: -------------------------------------------------------------------------------- 1 | package com.web.client.demo.config; 2 | 3 | import io.netty.channel.ChannelOption; 4 | import io.netty.handler.timeout.ReadTimeoutHandler; 5 | import io.netty.handler.timeout.WriteTimeoutHandler; 6 | import java.util.concurrent.TimeUnit; 7 | import org.springframework.beans.factory.annotation.Value; 8 | import org.springframework.context.annotation.Bean; 9 | import org.springframework.context.annotation.Configuration; 10 | import org.springframework.http.client.reactive.ReactorClientHttpConnector; 11 | import org.springframework.web.reactive.function.client.WebClient; 12 | import reactor.netty.http.client.HttpClient; 13 | 14 | @Configuration 15 | public class WebClientConfiguration { 16 | 17 | @Value("${api.base.url}") 18 | private String baseUrl; 19 | @Value("${api.timeout}") 20 | private int timeout; 21 | 22 | @Bean 23 | public WebClient webClientWithTimeout() { 24 | final var httpClient = HttpClient.create().option(ChannelOption.CONNECT_TIMEOUT_MILLIS, timeout) 25 | .doOnConnected(connection -> { 26 | connection.addHandlerLast(new ReadTimeoutHandler(timeout, TimeUnit.MILLISECONDS)); 27 | connection.addHandlerLast(new WriteTimeoutHandler(timeout, TimeUnit.MILLISECONDS)); 28 | }); 29 | 30 | return WebClient.builder().baseUrl(baseUrl) 31 | .clientConnector(new ReactorClientHttpConnector(httpClient)).build(); 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /src/main/java/com/web/client/demo/model/User.java: -------------------------------------------------------------------------------- 1 | package com.web.client.demo.model; 2 | 3 | import lombok.AllArgsConstructor; 4 | import lombok.Data; 5 | import lombok.NoArgsConstructor; 6 | 7 | @Data 8 | @AllArgsConstructor 9 | @NoArgsConstructor 10 | public class User { 11 | 12 | private Integer id; 13 | private String name; 14 | private String email; 15 | } 16 | -------------------------------------------------------------------------------- /src/main/java/com/web/client/demo/service/UserService.java: -------------------------------------------------------------------------------- 1 | package com.web.client.demo.service; 2 | 3 | import com.web.client.demo.model.User; 4 | import java.time.Duration; 5 | import lombok.RequiredArgsConstructor; 6 | import lombok.extern.slf4j.Slf4j; 7 | import org.springframework.http.HttpStatus; 8 | import org.springframework.stereotype.Service; 9 | import org.springframework.web.reactive.function.client.WebClient; 10 | import reactor.core.publisher.Mono; 11 | import reactor.util.retry.Retry; 12 | 13 | @Service 14 | @RequiredArgsConstructor 15 | @Slf4j 16 | public class UserService { 17 | 18 | private static final int MAX_RETRY_ATTEMPTS = 3; 19 | private static final int DELAY_MILLIS = 100; 20 | private final WebClient webClient; 21 | static final String USERS_URL_TEMPLATE = "/users/{id}"; 22 | static final String BROKEN_URL_TEMPLATE = "/broken-url/{id}"; 23 | 24 | public Mono getUserByIdAsync(final String id) { 25 | return webClient.get() 26 | .uri(USERS_URL_TEMPLATE, id) 27 | .retrieve() 28 | .bodyToMono(User.class); 29 | } 30 | 31 | public User getUserByIdSync(final String id) { 32 | return webClient.get() 33 | .uri(USERS_URL_TEMPLATE, id) 34 | .retrieve() 35 | .bodyToMono(User.class) 36 | .block(); 37 | } 38 | 39 | public User getUserWithRetrySync(final String id) { 40 | return webClient.get() 41 | .uri(BROKEN_URL_TEMPLATE, id) 42 | .retrieve() 43 | .bodyToMono(User.class) 44 | .doOnError(error -> log.error("An error has occurred {}", error.getMessage())) 45 | .retryWhen(Retry.fixedDelay(MAX_RETRY_ATTEMPTS, Duration.ofMillis(DELAY_MILLIS))) 46 | .block(); 47 | } 48 | 49 | public Mono getUserWithRetryAsync(final String id) { 50 | return webClient.get() 51 | .uri(BROKEN_URL_TEMPLATE, id) 52 | .retrieve() 53 | .bodyToMono(User.class) 54 | .doOnError(error -> log.error("An error has occurred {}", error.getMessage())) 55 | .onErrorResume( 56 | e -> Mono.error(new RuntimeException("Something went wrong: " + e.getMessage()))) 57 | .retryWhen(Retry.fixedDelay(MAX_RETRY_ATTEMPTS, Duration.ofMillis(DELAY_MILLIS))); 58 | } 59 | 60 | public User getUserWithFallback(final String id) { 61 | return webClient.get() 62 | .uri(BROKEN_URL_TEMPLATE, id) 63 | .retrieve() 64 | .bodyToMono(User.class) 65 | .doOnError(error -> log.error("An error has occurred {}", error.getMessage())) 66 | .onErrorResume(error -> Mono.just(new User())) 67 | .block(); 68 | } 69 | 70 | public User getUserWithErrorHandling(final String id) { 71 | return webClient.get() 72 | .uri(BROKEN_URL_TEMPLATE, id) 73 | .retrieve() 74 | .onStatus(HttpStatus.NOT_FOUND::equals, 75 | error -> Mono.error(new RuntimeException("API not found"))) 76 | .onStatus(HttpStatus.SERVICE_UNAVAILABLE::equals, 77 | error -> Mono.error(new RuntimeException("Server is not responding"))) 78 | .bodyToMono(User.class) 79 | .block(); 80 | } 81 | } 82 | -------------------------------------------------------------------------------- /src/main/resources/application.properties: -------------------------------------------------------------------------------- 1 | api.base.url=https://jsonplaceholder.typicode.com 2 | api.timeout=1000 3 | 4 | logging.level.org.springframework=INFO -------------------------------------------------------------------------------- /src/test/java/com/web/client/demo/DemoApplicationTests.java: -------------------------------------------------------------------------------- 1 | package com.web.client.demo; 2 | 3 | import org.junit.jupiter.api.Test; 4 | import org.springframework.boot.test.context.SpringBootTest; 5 | 6 | @SpringBootTest 7 | class DemoApplicationTests { 8 | 9 | @Test 10 | void contextLoads() { 11 | } 12 | 13 | } 14 | -------------------------------------------------------------------------------- /src/test/java/com/web/client/demo/service/UserServiceMockWebServerTest.java: -------------------------------------------------------------------------------- 1 | package com.web.client.demo.service; 2 | 3 | import static org.assertj.core.api.Assertions.assertThat; 4 | import static org.junit.jupiter.api.Assertions.assertThrows; 5 | 6 | import com.fasterxml.jackson.core.JsonProcessingException; 7 | import com.fasterxml.jackson.databind.ObjectMapper; 8 | import com.web.client.demo.model.User; 9 | import java.io.IOException; 10 | import java.util.concurrent.TimeUnit; 11 | import okhttp3.mockwebserver.MockResponse; 12 | import okhttp3.mockwebserver.MockWebServer; 13 | import okhttp3.mockwebserver.RecordedRequest; 14 | import org.junit.jupiter.api.AfterAll; 15 | import org.junit.jupiter.api.BeforeAll; 16 | import org.junit.jupiter.api.Test; 17 | import org.junit.jupiter.api.TestInstance; 18 | import org.springframework.web.reactive.function.client.WebClient; 19 | import reactor.core.publisher.Mono; 20 | import reactor.test.StepVerifier; 21 | 22 | @TestInstance(TestInstance.Lifecycle.PER_METHOD) 23 | class UserServiceMockWebServerTest { 24 | 25 | private static MockWebServer mockWebServer; 26 | private static UserService userService; 27 | private static ObjectMapper objectMapper; 28 | 29 | // Set up the test environment by initializing the mock web server and user service 30 | @BeforeAll 31 | static void setUp() throws IOException { 32 | objectMapper = new ObjectMapper(); 33 | mockWebServer = new MockWebServer(); 34 | mockWebServer.start(); 35 | userService = new UserService(WebClient.builder() 36 | .baseUrl(String.format("http://localhost:%s", mockWebServer.getPort())) 37 | .build()); 38 | } 39 | 40 | // Tear down the test environment by shutting down the mock web server 41 | @AfterAll 42 | static void tearDown() throws IOException { 43 | mockWebServer.shutdown(); 44 | } 45 | 46 | // Test the asynchronous getUserById method 47 | @Test 48 | void whenGetUserByIdAsync_thenShouldReturnUser() throws JsonProcessingException { 49 | User expectedUser = new User(1, "Eric Cartman", "eric.cartman@email.com"); 50 | mockWebServer.enqueue(new MockResponse().setBody(objectMapper.writeValueAsString(expectedUser)) 51 | .addHeader("Content-Type", "application/json")); 52 | 53 | Mono userMono = userService.getUserByIdAsync("1"); 54 | 55 | StepVerifier.create(userMono).thenAwait().expectNextMatches(user -> user.equals(expectedUser)) 56 | .verifyComplete(); 57 | } 58 | 59 | // Test the synchronous getUserById method 60 | @Test 61 | void whenGetUserByIdSync_thenShouldReturnUser() 62 | throws JsonProcessingException, InterruptedException { 63 | User expectedUser = new User(1, "Eric Cartman", "eric.cartman@email.com"); 64 | mockWebServer.enqueue(new MockResponse().setBody(objectMapper.writeValueAsString(expectedUser)) 65 | .addHeader("Content-Type", "application/json")); 66 | 67 | User actualUser = userService.getUserByIdSync("1"); 68 | RecordedRequest request = mockWebServer.takeRequest(1, TimeUnit.SECONDS); 69 | 70 | assertThat(request).isNotNull(); 71 | assertThat(request.getMethod()).isEqualTo("GET"); 72 | assertThat(request.getPath()).isEqualTo("/users/".concat(String.valueOf(expectedUser.getId()))); 73 | assertThat(actualUser).isEqualTo(expectedUser); 74 | } 75 | 76 | // Test the getUserWithRetryAsync method when the API keeps failing 77 | @Test 78 | void whenGetUserWithRetryAsync_apiKeepsFailing_thenShouldReturnError() { 79 | mockWebServer.enqueue(new MockResponse().setResponseCode(418)); 80 | mockWebServer.enqueue(new MockResponse().setResponseCode(418)); 81 | mockWebServer.enqueue(new MockResponse().setResponseCode(418)); 82 | mockWebServer.enqueue(new MockResponse().setResponseCode(418)); 83 | 84 | Mono userMono = userService.getUserWithRetryAsync("1"); 85 | 86 | StepVerifier.create(userMono) 87 | .expectErrorMatches(throwable -> throwable.getMessage() 88 | .equals("Retries exhausted: 3/3") && throwable.getCause() 89 | .getMessage() 90 | .contains("Something went wrong: 418 I'm a teapot")) 91 | .verify(); 92 | } 93 | 94 | // Test the getUserWithRetryAsync method when the API eventually succeeds 95 | @Test 96 | void whenGetUserWithRetryAsync_apiEventuallySucceeds_thenShouldReturnUser() 97 | throws JsonProcessingException { 98 | User expectedUser = new User(1, "Eric Cartman", "eric.cartman@email.com"); 99 | // Enqueue two failed responses and then a successful response 100 | mockWebServer.enqueue(new MockResponse().setResponseCode(500)); 101 | mockWebServer.enqueue(new MockResponse().setResponseCode(500)); 102 | mockWebServer.enqueue(new MockResponse().setBody(objectMapper.writeValueAsString(expectedUser)) 103 | .addHeader("Content-Type", "application/json")); 104 | 105 | Mono userMono = userService.getUserWithRetryAsync("1"); 106 | 107 | StepVerifier.create(userMono).expectNextMatches(user -> user.equals(expectedUser)) 108 | .verifyComplete(); 109 | } 110 | 111 | // Test the getUserWithFallback method when the API fails 112 | @Test 113 | void whenGetUserWithFallback_thenShouldReturnFallbackUser() { 114 | User fallbackUser = new User(); 115 | mockWebServer.enqueue(new MockResponse().setResponseCode(500)); 116 | 117 | User actualUser = userService.getUserWithFallback("1"); 118 | 119 | assertThat(actualUser).isEqualTo(fallbackUser); 120 | } 121 | 122 | // Test the getUserWithErrorHandling method when the API returns a Not Found error 123 | @Test 124 | void whenGetUserWithErrorHandling_notFound_thenShouldReturnError() { 125 | mockWebServer.enqueue(new MockResponse().setResponseCode(404)); 126 | Exception exception = assertThrows(RuntimeException.class, 127 | () -> userService.getUserWithErrorHandling("1")); 128 | 129 | assertThat(exception.getMessage()).isEqualTo("API not found"); 130 | } 131 | 132 | // Test the getUserWithErrorHandling method when the API returns a Service Unavailable error 133 | @Test 134 | void whenGetUserWithErrorHandling_serviceUnavailable_thenShouldReturnError() { 135 | mockWebServer.enqueue(new MockResponse().setResponseCode(503)); 136 | Exception exception = assertThrows(RuntimeException.class, 137 | () -> userService.getUserWithErrorHandling("1")); 138 | 139 | assertThat(exception.getMessage()).isEqualTo("Server is not responding"); 140 | } 141 | } -------------------------------------------------------------------------------- /src/test/java/com/web/client/demo/service/UserServiceMockitoTest.java: -------------------------------------------------------------------------------- 1 | package com.web.client.demo.service; 2 | 3 | import static com.web.client.demo.service.UserService.BROKEN_URL_TEMPLATE; 4 | import static org.assertj.core.api.Assertions.assertThat; 5 | import static org.assertj.core.api.Assertions.catchThrowable; 6 | import static org.mockito.ArgumentMatchers.eq; 7 | import static org.mockito.Mockito.when; 8 | 9 | import com.web.client.demo.model.User; 10 | import org.junit.jupiter.api.Test; 11 | import org.junit.jupiter.api.extension.ExtendWith; 12 | import org.mockito.InjectMocks; 13 | import org.mockito.Mock; 14 | import org.mockito.junit.jupiter.MockitoExtension; 15 | import org.springframework.web.reactive.function.client.WebClient; 16 | import org.springframework.web.reactive.function.client.WebClientResponseException; 17 | import reactor.core.publisher.Mono; 18 | 19 | @ExtendWith(MockitoExtension.class) 20 | class UserServiceMockitoTest { 21 | 22 | @Mock 23 | private WebClient webClient; 24 | 25 | @Mock 26 | private WebClient.RequestHeadersUriSpec requestHeadersUriSpec; 27 | 28 | @Mock 29 | private WebClient.RequestHeadersSpec requestHeadersSpec; 30 | 31 | @Mock 32 | private WebClient.ResponseSpec responseSpec; 33 | 34 | @InjectMocks 35 | private UserService userService; 36 | 37 | // Test the getUserByIdAsync method using Mockito 38 | @Test 39 | void whenGetUserByIdAsync_thenShouldReturnUser() { 40 | User expectedUser = new User(1, "Eric Cartman", "eric.cartman@email.com"); 41 | when(webClient.get()).thenReturn(requestHeadersUriSpec); 42 | when(requestHeadersUriSpec.uri(eq(UserService.USERS_URL_TEMPLATE), eq("1"))) 43 | .thenReturn(requestHeadersSpec); 44 | when(requestHeadersSpec.retrieve()).thenReturn(responseSpec); 45 | when(responseSpec.bodyToMono(User.class)).thenReturn(Mono.just(expectedUser)); 46 | 47 | Mono userMono = userService.getUserByIdAsync("1"); 48 | 49 | assertThat(userMono.block()).isEqualTo(expectedUser); 50 | } 51 | 52 | // Test the getUserByIdSync method using Mockito 53 | @Test 54 | void whenGetUserByIdSync_thenShouldReturnUser() { 55 | User expectedUser = new User(1, "Eric Cartman", "eric.cartman@email.com"); 56 | when(webClient.get()).thenReturn(requestHeadersUriSpec); 57 | when(requestHeadersUriSpec.uri(eq(UserService.USERS_URL_TEMPLATE), eq("1"))) 58 | .thenReturn(requestHeadersSpec); 59 | when(requestHeadersSpec.retrieve()).thenReturn(responseSpec); 60 | when(responseSpec.bodyToMono(User.class)).thenReturn(Mono.just(expectedUser)); 61 | 62 | User actualUser = userService.getUserByIdSync("1"); 63 | 64 | assertThat(actualUser).isEqualTo(expectedUser); 65 | } 66 | 67 | // Test the getUserWithRetryAsync method when the API keeps failing 68 | @Test 69 | void whenGetUserWithRetryAsync_apiKeepsFailing_thenShouldReturnError() { 70 | when(webClient.get()).thenReturn(requestHeadersUriSpec); 71 | when(requestHeadersUriSpec.uri(eq(BROKEN_URL_TEMPLATE), eq("1"))) 72 | .thenReturn(requestHeadersSpec); 73 | when(requestHeadersSpec.retrieve()).thenReturn(responseSpec); 74 | when(responseSpec.bodyToMono(User.class)).thenReturn( 75 | Mono.error(new RuntimeException("API is down"))); 76 | 77 | Throwable throwable = catchThrowable(() -> userService.getUserWithRetryAsync("1").block()); 78 | assertThat(throwable).isInstanceOf(RuntimeException.class) 79 | .hasMessage("Retries exhausted: 3/3"); 80 | assertThat(throwable.getCause()).isInstanceOf(RuntimeException.class) 81 | .hasMessage("Something went wrong: API is down"); 82 | } 83 | 84 | // Test the getUserWithFallback method when the API fails 85 | @Test 86 | void whenGetUserWithFallback_thenShouldReturnFallbackUser() { 87 | User fallbackUser = new User(); 88 | when(webClient.get()).thenReturn(requestHeadersUriSpec); 89 | when(requestHeadersUriSpec.uri(eq(UserService.BROKEN_URL_TEMPLATE), eq("1"))) 90 | .thenReturn(requestHeadersSpec); 91 | when(requestHeadersSpec.retrieve()).thenReturn(responseSpec); 92 | when(responseSpec.bodyToMono(User.class)).thenReturn(Mono.error( 93 | WebClientResponseException.create(503, "Service Unavailable", null, null, null))); 94 | } 95 | } --------------------------------------------------------------------------------