JavaBuilder handling CoreException

[Eskibear]

org.eclipse.core.internal.resources.ResourceException(.......)[368]: java.lang.Exception: File not found: .........
	at org.eclipse.core.internal.resources.ResourceException.provideStackTrace(ResourceException.java:42)
	at org.eclipse.core.internal.resources.ResourceException.<init>(ResourceException.java:38)
	at org.eclipse.core.internal.localstore.FileSystemResourceManager.read(FileSystemResourceManager.java:835)
	at org.eclipse.core.internal.resources.File.getContents(File.java:277)
	at org.eclipse.jdt.internal.core.util.Util.getResourceContentsAsByteArray(Util.java:1172)
	at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.writeClassFileCheck(IncrementalImageBuilder.java:942)
	at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.writeClassFileContents(IncrementalImageBuilder.java:884)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.writeClassFile(AbstractImageBuilder.java:866)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.acceptResult(AbstractImageBuilder.java:194)
	at org.eclipse.jdt.internal.compiler.Compiler.processCompiledUnits(Compiler.java:615)
	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:475)
	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:379)
	at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.compile(IncrementalImageBuilder.java:371)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:311)
	at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.incrementalBuildLoop(IncrementalImageBuilder.java:190)
	at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.build(IncrementalImageBuilder.java:147)
	at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildDeltas(JavaBuilder.java:289)
	at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:212)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:860)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:232)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:281)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:334)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:337)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:392)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:417)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:161)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:255)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

org.eclipse.core.internal.resources.ResourceException(.......)[275]: java.lang.Exception: A resource exists with a different case: '.........'.
	at org.eclipse.core.internal.resources.ResourceException.provideStackTrace(ResourceException.java:42)
	at org.eclipse.core.internal.resources.ResourceException.<init>(ResourceException.java:38)
	at org.eclipse.core.internal.resources.Resource.checkDoesNotExist(Resource.java:318)
	at org.eclipse.core.internal.resources.Resource.checkDoesNotExist(Resource.java:296)
	at org.eclipse.core.internal.resources.File.create(File.java:109)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.writeClassFileContents(AbstractImageBuilder.java:887)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.writeClassFile(AbstractImageBuilder.java:866)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.acceptResult(AbstractImageBuilder.java:194)
	at org.eclipse.jdt.internal.compiler.Compiler.processCompiledUnits(Compiler.java:615)
	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:475)
	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:379)
	at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.compile(BatchImageBuilder.java:214)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:311)
	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.buildDeltas(JavaBuilder.java:294)
	at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:212)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:860)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:232)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:281)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:334)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:337)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:392)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:417)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:161)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:255)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

[github-actions]

Hi @Eskibear, I'm an AI Support assistant here to help with your issue. While the team reviews your request, I wanted to provide some possible tips and documentation that might help you in the meantime.

Possible solutions

• Refresh workspace after external build
  Ensure the language server sees updated class files by forcing VS Code/Eclipse to refresh the output folder:
  • In VS Code, run “File: Refresh” or enable polling watchers on target/classes (see https://github.com/redhat-developer/vscode-java/issues/572#issuecomment-… ).
  • In Eclipse, enable Refresh on access or invoke F5 on the project.

• Clean/restart the Java language server
  Use “Java: Clean the Java language server workspace” (VS Code) or “Project → Clean…” (Eclipse) after a Maven/Gradle build to re-sync class files.

• Disable auto-build (incremental builder)
  If you see frequent CoreExceptions, consider disabling incremental builds:
  • VS Code: set "java.autobuild.enabled": false
  • Eclipse: uncheck Build Automatically

• Fix case-sensitivity conflicts on Windows
  The A resource exists with a different case error indicates two class files whose names differ only by letter case. Rename packages/types so that generated .class names match exactly the folder/file casing on disk.

High-confidence references

• Language server throws 'File not found' exception even file is there
  Reports the same JavaBuilder handling CoreException … File not found and recommends workspace refresh and file‐watcher adjustments.

• External clean build gets jdt.ls out-of-sync
  Describes JavaBuilder handling CoreException: File not found… after a Maven build; suggests manual refresh/clean and LS restart.

Other references with low confidence

• Fail to compile Java 21 unnamed class
  Similar JavaBuilder handling CoreException stack trace but caused by invalid characters in anonymous-class names. No direct fix for file-not-found.

The team will respond to your issue shortly. I hope these suggestions are helpful in the meantime. If this comment helped you, please give it a 👍. If the suggestion was not helpful or incorrect, please give it a 👎. Your feedback helps us improve!

[Eskibear]

stale