0039557: Eclipse warnings task fails when processing log4j annotations

Description

The project compiles without errors in Eclipse IDE. However, using the ecj batch compiler in the eclipse-warnings task it fails in the annotation processing step with the following message:

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)

This issue has already been reported in:
- Stack Overflow: https://stackoverflow.com/questions/52998733/ecj-fails-with-illegalargumentexception-processing-log4j-annotations [^]
- Log4j Jira: https://issues.apache.org/jira/browse/LOG4J2-2487 [^]
- Eclipse issue tracker: https://bugs.eclipse.org/bugs/show_bug.cgi?id=540569 [^]

Steps To Reproduce

The following repository contains a minimal scenario to reproduce this issue:

https://github.com/katanagari7c1/ecj-error-log4j [^]

Just clone this repository and execute run-ecj.sh.

Proposed Solution

Until either Eclipse/Apache comes with a patch to solve this issue, log4j's annotation processor can be skipped in batch build by removing META-INF/services/javax.annotation.processing.Processor in log4j-core-x.y.z.jar.

This should be done only in eclipse-warnings task.

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Relationships [ Relation Graph ] [ Dependency Graph ]

related to

feature request

0039504

closed

jarmendariz

Openbravo ERP

Upgrade Log4j to version 2

Notes
(0107658) jarmendariz (developer) 2018-10-30 14:28	Repository: ci/eclipse-warnings Changeset: ada4fd8fd3c2 Author: Javier Armendáriz <javier.armendariz <at> openbravo.com> Date: Mon, 29 Oct 2018 17:24:08 +0100 URL: https://code.openbravo.com/tools/ci/eclipse-warnings/rev/ada4fd8fd3c2 [^] Fixed issue 39557: Ecj fails when processing log4j annotations This replaces the log4j-core library in the classpath with a customized jar with no annotation processing as a workaround until this bug is solved. Also wrapped all js code in CDATA tags to avoid problems with the && operator. --- M build-eclipse.xml A log4j-core-2.11.1.jar ---

Issue History
Date Modified	Username	Field	Change
2018-10-29 16:42	jarmendariz	New Issue
2018-10-29 16:44	jarmendariz	Relationship added	related to 0039504
2018-10-29 16:45	jarmendariz	Assigned To	=> jarmendariz
2018-10-29 16:45	jarmendariz	Status	new => scheduled
2018-10-30 14:28	jarmendariz	Note Added: 0107658
2018-10-30 14:28	jarmendariz	Status	scheduled => resolved
2018-10-30 14:28	jarmendariz	Resolution	open => fixed
2018-10-30 14:29	jarmendariz	Review Assigned To	=> alostale
2018-11-08 09:56	alostale	Status	resolved => closed