Tuesday, May 24, 2022

[FIXED] Errors when running Eclipse on Java 17

May 24, 2022 eclipse, java, java-17

Issue

I get errors when I try to start Eclipse 2021-06 (4.20.0) on a Java 17 JRE.

The errors show in a dialog and the Error Log:

src="https://i.stack.imgur.com/nq7oN.png" alt="Screen shot" />

How can I fix this?

The contents of the error messages is this:

java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @2bc378f7
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
    at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
    at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.overrideLoadResult(ModuleClassLoader.java:86)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
    at org.eclipse.jdt.internal.compiler.parser.Parser.endParse(Parser.java:11750)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:12949)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:13176)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:13133)
    at org.eclipse.jdt.internal.compiler.parser.Parser.dietParse(Parser.java:11521)
    at org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:850)
    at org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:394)
    at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:444)
    at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
    at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:377)
    at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.compile(BatchImageBuilder.java:214)
    at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:309)
    at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.build(BatchImageBuilder.java:79)
    at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildAll(JavaBuilder.java:272)
    at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:192)
    at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:846)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:229)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:277)
    at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:330)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:333)
    at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:385)
    at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:406)
    at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:154)
    at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:244)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @2bc378f7
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
    at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
    at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.overrideLoadResult(ModuleClassLoader.java:86)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
    at org.eclipse.jdt.internal.compiler.parser.Parser.endParse(Parser.java:11750)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:12949)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:13176)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:13133)
    at org.eclipse.jdt.internal.compiler.parser.Parser.dietParse(Parser.java:11521)
    at org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:850)
    at org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:394)
    at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:444)
    at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
    at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:377)
    at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.compile(BatchImageBuilder.java:214)
    at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:309)
    at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.build(BatchImageBuilder.java:79)
    at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildAll(JavaBuilder.java:272)
    at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:187)
    at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:846)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:229)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:277)
    at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:330)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:333)
    at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:385)
    at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:406)
    at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:154)
    at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:244)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

java.lang.reflect.InaccessibleObjectException: Unable to make field private static volatile java.net.Authenticator java.net.Authenticator.theAuthenticator accessible: module java.base does not "opens java.net" to unnamed module @1ab8b487
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
    at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
    at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
    at net.sf.eclipsecs.core.config.configtypes.RemoteConfigurationType$RemoteConfigAuthenticator.getDefault(RemoteConfigurationType.java:376)
    at net.sf.eclipsecs.core.config.configtypes.RemoteConfigurationType.getCheckstyleConfiguration(RemoteConfigurationType.java:99)
    at net.sf.eclipsecs.core.config.CheckConfiguration.getCheckstyleConfiguration(CheckConfiguration.java:161)
    at net.sf.eclipsecs.core.builder.CheckerFactory.getCacheKey(CheckerFactory.java:157)
    at net.sf.eclipsecs.core.builder.CheckerFactory.createChecker(CheckerFactory.java:99)
    at net.sf.eclipsecs.core.builder.Auditor.runAudit(Auditor.java:139)
    at net.sf.eclipsecs.core.builder.CheckstyleBuilder.handleBuildSelection(CheckstyleBuilder.java:307)
    at net.sf.eclipsecs.core.builder.CheckstyleBuilder.build(CheckstyleBuilder.java:173)
    at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:846)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:229)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:277)
    at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:330)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:333)
    at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:385)
    at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:406)
    at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:154)
    at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:244)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Solution

My problems turned out to be caused by the Eclipse plugins that I was using, not Eclipse itself.

The plugins are these:

Lombok 1.18.20.
Eclipse Checkstyle 8.36.1

The solution for me is to run Eclipse using an older JRE.

Cause

The problems are caused by the fact that the plugins make use of internal JDK components that never were intended to be exposed. They have been encapsulated in the lasted JDK as part of this change:

https://openjdk.java.net/jeps/403

Update: Fixes

Eclipse Checkstyle claims to have fixed the problem in this ticket (I have not verified): https://github.com/checkstyle/eclipse-cs/issues/281
Lombok claims to have fixed the problem in this ticket (I have not verified): https://github.com/projectlombok/lombok/issues/2810

I welcome other solutions that make it possible to continue running Eclipse with the same old plugins even on Java 17!

Answered By - Lii
Answer Checked By - Mary Flores (JavaFixing Volunteer)

This Answer collected from stackoverflow and tested by JavaFixing community admins, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0