[LOG4J2-2487] IllegalArgumentException when compiling plugin with Eclipse batch compiler

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.8, 2.10.0, 2.11.1
• Component/s: Plugins

Environment

Ubuntu 18.04 or OSX machine. ECJ version 4.7 or 4.9. Java 8, either OpenJDK and Oracle. Reproduced with Log4j 2.8, 2.10.0 and 2.11.1.

• Assignee: Unassigned
• Reporter: Javier Armendáriz
• Created: 26/Oct/18 07:11
• Updated: 26/Oct/18 07:16

Description

Recently I started using log4j 2 in my project and I created some custom appenders and configuration factories using the @Plugin annotation.

It all worked fine and show no errors compiling in Eclipse 4.9 and IntelliJ Idea. However, using the Eclipse batch compiler, my code fails with the following stacktrace:

Processing annotations
java.lang.IllegalArgumentException: Unknown location : CLASS_OUTPUT
	at org.eclipse.jdt.internal.compiler.apt.util.EclipseFileManager.getFileForOutput(EclipseFileManager.java:436)
	at org.eclipse.jdt.internal.compiler.apt.dispatch.BatchFilerImpl.createResource(BatchFilerImpl.java:89)
	at org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor.writeCacheFile(PluginProcessor.java:117)
	at org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor.process(PluginProcessor.java:78)
	at org.eclipse.jdt.internal.compiler.apt.dispatch.RoundDispatcher.handleProcessor(RoundDispatcher.java:142)
	at org.eclipse.jdt.internal.compiler.apt.dispatch.RoundDispatcher.round(RoundDispatcher.java:124)
	at org.eclipse.jdt.internal.compiler.apt.dispatch.BaseAnnotationProcessorManager.processAnnotations(BaseAnnotationProcessorManager.java:162)
	at org.eclipse.jdt.internal.compiler.Compiler.processAnnotations(Compiler.java:940)
	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:450)
	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
	at org.eclipse.jdt.internal.compiler.batch.Main.performCompilation(Main.java:4693)
	at org.eclipse.jdt.internal.compiler.batch.Main.compile(Main.java:1781)
	at org.eclipse.jdt.internal.compiler.batch.Main.main(Main.java:1485)
Processing annotations
No elements to process
1. ERROR: Unknown location : CLASS_OUTPUT
1 problem (1 error)

In order to reproduce this bug, I created this project with the minimal code to test my scenario.