├── .gitignore ├── .travis.yml ├── LICENSE ├── README.md ├── build.gradle ├── ci └── build.sh ├── dependencies.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle ├── uncheck-exceptions-codegen ├── build.gradle └── src │ ├── main │ └── java │ │ └── com │ │ └── artemzin │ │ └── uncheckexceptions │ │ └── codegen │ │ └── CodegenUncheckExceptions.kt │ └── test │ └── java │ └── com │ └── artemzin │ └── uncheckexceptions │ └── codegen │ ├── CodegenUncheckExceptionsTest.kt │ ├── JavaTest.java │ └── TestClassLoader.kt └── uncheck-exceptions-integration-test ├── build.gradle └── src └── test └── java └── com └── artemzin └── uncheckexceptions └── integrationtest └── UncheckExceptionsIntegrationTest.java /.gitignore: -------------------------------------------------------------------------------- 1 | /.idea/ 2 | *.iml 3 | local.properties 4 | !.idea/codeStyleSettings.xml 5 | out/ 6 | 7 | .DS_Store 8 | 9 | .gradle 10 | build/ 11 | 12 | *.jar 13 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | sudo: false 2 | 3 | language: java 4 | jdk: 5 | - oraclejdk8 6 | 7 | # Override default Travis install step that calls `./gradlew assemble`. 8 | install: true 9 | 10 | script: ci/build.sh 11 | 12 | cache: 13 | directories: 14 | - $HOME/.gradle/wrapper 15 | - $HOME/.gradle/caches 16 | -------------------------------------------------------------------------------- /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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The text should be enclosed in the appropriate 184 | comment syntax for the file format. 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 [2018] [Artem Zinnatullin] 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 | # Java Uncheck Exceptions 2 | 3 | ## Problem 4 | 5 | In Java language (source code) you can't throw checked exceptions if method doesn't declare that. 6 | 7 | Typical solution is to wrap it into `RuntimeException`, but this way you [hide exception type](https://github.com/ReactiveX/RxJava/issues/5965). 8 | 9 | There are big production projects that have a method that wrap exception into `RuntimeException` to avoid declaring checked exceptions in methods: 10 | 11 | - [RxJava 2.x ExceptionHelper.wrapOrThrow](https://github.com/ReactiveX/RxJava/blob/v2.1.12/src/main/java/io/reactivex/internal/util/ExceptionHelper.java#L38) 12 | - [Guava Throwables.propagate](https://github.com/google/guava/wiki/ThrowablesExplained), they even deprecated it and propose manual wrapping into `RuntimeException()` 13 | 14 | ## Goal 15 | 16 | Throw checked `Exception`s and `Throwable`s **without wrapping** and **without declaring** it in method description. 17 | 18 | ## Implementation 19 | 20 | From Java bytecode and JVM POV it's totally ok to throw checked exceptions anywhere, see [`ATHROW` opcode documentation](https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-6.html#jvms-6.5.athrow). 21 | 22 | The only problem is that you can't write Java code that does this because Java compiler won't let you compile it… 23 | 24 | So I codegen bytecode that does it with [ASM](http://asm.ow2.org/) and then create a jar! 25 | 26 | ## API 27 | 28 | Library has 0 dependencies, targets Java 6 and provides a single static method: 29 | 30 | ```java 31 | UncheckExceptions.thr0w(Throwable t); 32 | ``` 33 | 34 | I highly recommend statically import `thr0w` method, so it'll look like standard `throw`: 35 | 36 | ```java 37 | import static com.artemzin.uncheckexceptions.UncheckExceptions.thr0w; 38 | 39 | public static void main(String[] args) { // Note that it doesn't declare `throws Exception`! 40 | thr0w(new Exception()); 41 | } 42 | ``` 43 | 44 | ## Download 45 | 46 | I haven't published it to Maven Central yet (hopefully will do soon, Gradle publishing is ridiculous). 47 | 48 | However you can download jar to play with from [Releases page](https://github.com/artem-zinnatullin/java-uncheck-exceptions/releases). 49 | 50 | ## Alternatives 51 | 52 | - "Sneaky Throw" (just google that), it's a trick with Java generics that lets you do it from Java code. [Example in Okio](https://github.com/square/okio/blob/5f09744e1720e7d4a7da9076b701a2350bf7ec39/okio/src/main/java/okio/Util.java#L64) 53 | - [Lombok's `@SneakyThrows` feature](https://projectlombok.org/features/SneakyThrows) allows you do just that, but requires to use Lombok (duh). 54 | - [Kotlin lets you throw any exceptions as unchecked](https://kotlinlang.org/docs/reference/exceptions.html#checked-exceptions), but requires to use Kotlin (duh). It's a great alternative though, but there are foundational projects like RxJava that can't use Kotlin 55 | 56 | ## Contributing 57 | 58 | ### Project Structure 59 | 60 | Project has two modules: 61 | 62 | - `uncheck-exceptions-codegen` generates bytecode that can throw checked exception as unchecked (has unit tests). 63 | - `uncheck-exceptions-integration-test` consumes generated `uncheck-exceptions.jar` and runs integration tests to make sure library works as expected. 64 | 65 | ### Building 66 | 67 | To build project you need Bash and JDK 7+, then run: 68 | 69 | ```console 70 | ci/build.sh 71 | ``` 72 | 73 | It'll output something like: 74 | 75 | ```console 76 | … 77 | Done! 78 | uncheck-exceptions.jar can be found in build/libs directory. 79 | ``` 80 | 81 | ### IDE 82 | 83 | You can import project in IntelliJ or your JVM IDE of choice. 84 | 85 | Note: 86 | 87 | >`uncheck-exceptions-integration-test` might be red in IDE until you run `ci/build.sh` because it links to jar that needs to be generated first. 88 | >PRs to wire it properly via Gradle is very welcome! 89 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | apply from: 'dependencies.gradle' 2 | 3 | buildscript { 4 | // Gradle will not find vars defined in an external file when referring to them 5 | // in the buildscript block, unless you link it from the buildscript block, too. 6 | apply from: 'dependencies.gradle' 7 | 8 | repositories { 9 | jcenter() 10 | } 11 | 12 | dependencies { 13 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$versions.kotlin" 14 | classpath 'com.github.ben-manes:gradle-versions-plugin:0.13.0' 15 | classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.3' 16 | } 17 | } 18 | 19 | allprojects { 20 | repositories { 21 | jcenter() 22 | } 23 | 24 | apply plugin: 'com.github.ben-manes.versions' 25 | } 26 | -------------------------------------------------------------------------------- /ci/build.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | set -eu 3 | 4 | # You can run it from any directory. 5 | DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" 6 | 7 | pushd "$DIR/.." > /dev/null 8 | 9 | # Clean previous build output. 10 | echo "Cleaning previous build output..." 11 | ./gradlew clean 12 | 13 | # Build codegen app. 14 | echo "Building codegen app..." 15 | ./gradlew :uncheck-exceptions-codegen:build 16 | 17 | # Run codegen to generate uncheck-exceptions.jar 18 | echo "Generating uncheck-exceptions.jar..." 19 | ./gradlew :uncheck-exceptions-codegen:run 20 | mkdir -p build/libs 21 | mv uncheck-exceptions-codegen/uncheck-exceptions.jar build/libs 22 | 23 | # Run integration tests against uncheck-exceptions.jar 24 | echo "Running integration tests against uncheck-exceptions.jar..." 25 | ./gradlew :uncheck-exceptions-integration-test:build 26 | 27 | echo "Done!" 28 | echo "uncheck-exceptions.jar can be found in build/libs directory." 29 | -------------------------------------------------------------------------------- /dependencies.gradle: -------------------------------------------------------------------------------- 1 | ext.versions = [ 2 | kotlin: '1.2.31', 3 | asm : '6.1.1', 4 | junit : '4.12', 5 | ] 6 | 7 | ext.libraries = [ 8 | kotlinStdlib: "org.jetbrains.kotlin:kotlin-stdlib:$versions.kotlin", 9 | asm : "org.ow2.asm:asm:$versions.asm", 10 | asmUtil : "org.ow2.asm:asm-util:$versions.asm", 11 | ] 12 | 13 | ext.testLibraries = [ 14 | junit4: "junit:junit:$versions.junit", 15 | ] 16 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/artem-zinnatullin/java-uncheck-exceptions/c7e56f91d31542fb2407c78e7283f5be50c61317/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionBase=GRADLE_USER_HOME 2 | distributionPath=wrapper/dists 3 | distributionUrl=https\://services.gradle.org/distributions/gradle-4.7-bin.zip 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn () { 37 | echo "$*" 38 | } 39 | 40 | die () { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save () { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':uncheck-exceptions-codegen' 2 | include ':uncheck-exceptions-integration-test' 3 | -------------------------------------------------------------------------------- /uncheck-exceptions-codegen/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'kotlin' 2 | apply plugin: 'java' 3 | apply plugin: 'application' 4 | 5 | mainClassName = 'com.artemzin.uncheckexceptions.codegen.CodegenUncheckExceptionsKt' 6 | 7 | jar { 8 | manifest { 9 | attributes( 10 | 'Main-Class' : mainClassName 11 | ) 12 | } 13 | } 14 | 15 | dependencies { 16 | compile libraries.kotlinStdlib 17 | compile libraries.asm 18 | compile libraries.asmUtil 19 | } 20 | 21 | dependencies { 22 | testImplementation testLibraries.junit4 23 | } 24 | -------------------------------------------------------------------------------- /uncheck-exceptions-codegen/src/main/java/com/artemzin/uncheckexceptions/codegen/CodegenUncheckExceptions.kt: -------------------------------------------------------------------------------- 1 | package com.artemzin.uncheckexceptions.codegen 2 | 3 | import org.objectweb.asm.ClassWriter 4 | import org.objectweb.asm.ClassWriter.COMPUTE_FRAMES 5 | import org.objectweb.asm.Opcodes.* 6 | import org.objectweb.asm.util.CheckClassAdapter 7 | import java.io.ByteArrayOutputStream 8 | import java.io.File 9 | import java.util.jar.Attributes.Name.* 10 | import java.util.jar.JarEntry 11 | import java.util.jar.JarOutputStream 12 | import java.util.jar.Manifest 13 | 14 | /** 15 | * Throwing checked exceptions & {@code Throwable} without declaring {@code throws Exception} or wrapping them in a 16 | * {@code RuntimeException} is not possible in Java source code, Java compiler declines attempts to compile such code. 17 | * 18 | * However, it's perfectly legal to throw any extender of {@code Throwable} from Java bytecode POV. 19 | * See https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-6.html#jvms-6.5.athrow. 20 | * 21 | * Since it's not possible to get Java compiler to generate such bytecode, we need to generate bytecode ourselves… 22 | */ 23 | fun main(args: Array) { 24 | val UncheckExceptionsClass = generateUncheckExceptionsClass() 25 | val jar = generateJar(UncheckExceptionsClass to "com/artemzin/uncheckexceptions/UncheckExceptions.class") 26 | 27 | File("uncheck-exceptions.jar").writeBytes(jar) 28 | } 29 | 30 | fun generateUncheckExceptionsClass(): ByteArray { 31 | val classWriter = ClassWriter(COMPUTE_FRAMES) 32 | val classVisitor = CheckClassAdapter(classWriter) 33 | 34 | classVisitor 35 | .visit( 36 | V1_6, 37 | ACC_PUBLIC + ACC_FINAL, 38 | "com/artemzin/uncheckexceptions/UncheckExceptions", 39 | null, 40 | "java/lang/Object", 41 | null 42 | ) 43 | 44 | classVisitor 45 | .visitMethod( 46 | ACC_PUBLIC + ACC_STATIC, 47 | "thr0w", 48 | "(Ljava/lang/Throwable;)V", 49 | null, 50 | null 51 | ) 52 | .apply { 53 | // Consider adding @NotNull annotation, but JSR305 is screwed so it's unclear for now. 54 | visitCode() 55 | 56 | visitVarInsn(ALOAD, 0) 57 | visitInsn(ATHROW) 58 | 59 | visitMaxs(1, 1) 60 | } 61 | .visitEnd() 62 | 63 | classVisitor.visitEnd() 64 | 65 | return classWriter.toByteArray() 66 | } 67 | 68 | fun generateJar(generatedClass: Pair): ByteArray { 69 | val manifest = Manifest().apply { 70 | mainAttributes[MANIFEST_VERSION] = "1.0" 71 | } 72 | 73 | val outputStream = ByteArrayOutputStream() 74 | val jarOutputStream = JarOutputStream(outputStream, manifest) 75 | 76 | val jarEntry = JarEntry(generatedClass.second) 77 | jarEntry.time = System.currentTimeMillis() 78 | 79 | jarOutputStream.putNextEntry(jarEntry) 80 | 81 | jarOutputStream.write(generatedClass.first) 82 | jarOutputStream.closeEntry() 83 | jarOutputStream.close() 84 | 85 | return outputStream.toByteArray() 86 | } 87 | -------------------------------------------------------------------------------- /uncheck-exceptions-codegen/src/test/java/com/artemzin/uncheckexceptions/codegen/CodegenUncheckExceptionsTest.kt: -------------------------------------------------------------------------------- 1 | package com.artemzin.uncheckexceptions.codegen 2 | 3 | import org.junit.Test 4 | 5 | import org.junit.Assert.* 6 | import org.objectweb.asm.ClassReader 7 | import org.objectweb.asm.util.TraceClassVisitor 8 | import java.io.PrintWriter 9 | import java.io.StringWriter 10 | 11 | class CodegenUncheckExceptionsTest { 12 | 13 | @Test 14 | fun generateClassDoesNotThrowExceptions() { 15 | generateUncheckExceptionsClass() 16 | } 17 | 18 | @Test 19 | fun generateClassProducesExpectedJavaBytecode() { 20 | val classReader = ClassReader(generateUncheckExceptionsClass()) 21 | val stringWriter = StringWriter() 22 | 23 | classReader.accept(TraceClassVisitor(PrintWriter(stringWriter)), 0) 24 | 25 | assertEquals( 26 | "// class version 50.0 (50)\n" + 27 | "// access flags 0x11\n" + 28 | "public final class com/artemzin/uncheckexceptions/UncheckExceptions {\n" + 29 | "\n" + 30 | "\n" + 31 | " // access flags 0x9\n" + 32 | " public static thr0w(Ljava/lang/Throwable;)V\n" + 33 | " ALOAD 0\n" + 34 | " ATHROW\n" + 35 | " MAXSTACK = 1\n" + 36 | " MAXLOCALS = 1\n" + 37 | "}\n", 38 | stringWriter.toString() 39 | ) 40 | } 41 | } 42 | -------------------------------------------------------------------------------- /uncheck-exceptions-codegen/src/test/java/com/artemzin/uncheckexceptions/codegen/JavaTest.java: -------------------------------------------------------------------------------- 1 | package com.artemzin.uncheckexceptions.codegen; 2 | 3 | import org.junit.Test; 4 | 5 | import java.lang.reflect.InvocationTargetException; 6 | import java.lang.reflect.Method; 7 | 8 | import static org.junit.Assert.assertSame; 9 | import static org.junit.Assert.fail; 10 | 11 | public class JavaTest { 12 | 13 | private static final class TestCheckedException extends Exception { 14 | 15 | } 16 | 17 | @Test 18 | public void thr0wThrowsCheckedExceptionAsIs() throws NoSuchMethodException, IllegalAccessException { 19 | Class UncheckExceptions = new TestClassLoader() 20 | .loadClass("com.artemzin.uncheckexceptions.UncheckExceptions"); 21 | 22 | Method thr0w = UncheckExceptions.getDeclaredMethod("thr0w", Throwable.class); 23 | 24 | TestCheckedException testException = new TestCheckedException(); 25 | 26 | try { 27 | thr0w.invoke(null, testException); 28 | fail(); 29 | } catch (InvocationTargetException expected) { 30 | assertSame(testException, expected.getCause()); 31 | } 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /uncheck-exceptions-codegen/src/test/java/com/artemzin/uncheckexceptions/codegen/TestClassLoader.kt: -------------------------------------------------------------------------------- 1 | package com.artemzin.uncheckexceptions.codegen 2 | 3 | class TestClassLoader : ClassLoader() { 4 | override fun loadClass(name: String): Class<*> { 5 | return when (name) { 6 | "com.artemzin.uncheckexceptions.UncheckExceptions" -> { 7 | val generatedClass = generateUncheckExceptionsClass() 8 | defineClass(name, generatedClass, 0, generatedClass.size) 9 | } 10 | 11 | else -> super.loadClass(name) 12 | } 13 | } 14 | } 15 | -------------------------------------------------------------------------------- /uncheck-exceptions-integration-test/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'java-library' 2 | 3 | dependencies { 4 | testImplementation files('../build/libs/uncheck-exceptions.jar') 5 | testImplementation testLibraries.junit4 6 | } 7 | -------------------------------------------------------------------------------- /uncheck-exceptions-integration-test/src/test/java/com/artemzin/uncheckexceptions/integrationtest/UncheckExceptionsIntegrationTest.java: -------------------------------------------------------------------------------- 1 | package com.artemzin.uncheckexceptions.integrationtest; 2 | 3 | import org.junit.Test; 4 | 5 | import static com.artemzin.uncheckexceptions.UncheckExceptions.thr0w; 6 | import static org.junit.Assert.assertSame; 7 | 8 | public class UncheckExceptionsIntegrationTest { 9 | 10 | @Test(expected = Exception.class) 11 | public void thr0wDoesNotRequireExceptionInMethodSignature() { 12 | thr0w(new Exception()); 13 | } 14 | 15 | private static final class TestCheckedException extends Exception { 16 | 17 | } 18 | 19 | @Test 20 | public void thr0wThrowsCheckedExceptionAsIsWithoutDeclaration() { 21 | TestCheckedException testException = new TestCheckedException(); 22 | 23 | try { 24 | thr0w(testException); 25 | } catch (Throwable expected) { // Loooool, compiler doesn't let us declare expected exception as TestCheckedException because it doesn't see it in method description xD 26 | assertSame(testException, expected); 27 | } 28 | } 29 | } 30 | --------------------------------------------------------------------------------