javaeclipsejava-17
Errors when running Eclipse on Java 17
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:
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!
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