Thorsten Heit created SLF4J-456:
-----------------------------------
Summary: SLF4J 1.8 on JVMs < 9
Key: SLF4J-456
URL: https://jira.qos.ch/browse/SLF4J-456
Project: SLF4J
Issue Type: Bug
Components: Core API, jcl-over-slf4j
Affects Versions: 1.8.0-beta2
Reporter: Thorsten Heit
Assignee: SLF4J developers list
When I use slf4j-1.8.0-beta2 in an application that is being deployed to our
Websphere 9 server, I see error messages in the deployment manager console:
{noformat}
(...)
[2/18/19 15:51:31:862 CET] 000022bd WSModuleDescr E WSWS7011E: The
configuration for the myapp-war-2019.4.0-SNAPSHOT.war application module cannot
load correctly.
The following error occurred:
com.ibm.ws.metadata.annotations.AnnotationException: Annotation processing
failed for class: module-info.class
at
com.ibm.ws.metadata.annotations.AnnotationConfigReader.getAnnotationData(AnnotationConfigReader.java:883)
at
com.ibm.ws.metadata.annotations.AnnotationConfigReader.getAnnotationDataForZippedArchive(AnnotationConfigReader.java:766)
at
com.ibm.ws.metadata.annotations.AnnotationConfigReader.getAnnotationData(AnnotationConfigReader.java:696)
at
com.ibm.ws.metadata.annotations.AnnotationConfigReader.populateModuleData(AnnotationConfigReader.java:353)
at
com.ibm.ws.metadata.MetaDataOrchestrator.getModuleData(MetaDataOrchestrator.java:112)
at
com.ibm.ws.websvcs.annotations.collector.WASAnnotationCollector.getMDO(WASAnnotationCollector.java:258)
at
com.ibm.ws.websvcs.annotations.collector.WASAnnotationCollector.collect(WASAnnotationCollector.java:146)
at
com.ibm.ws.websvcs.desc.WSModuleDescriptorImpl.getClassDataObjects(WSModuleDescriptorImpl.java:1458)
at
com.ibm.ws.websvcs.desc.WSModuleDescriptorImpl.initDBCMap(WSModuleDescriptorImpl.java:2153)
at
com.ibm.ws.websvcs.desc.WSModuleDescriptorImpl.buildJAXWSServiceRefs(WSModuleDescriptorImpl.java:1137)
at
com.ibm.ws.websvcs.desc.WSModuleDescriptorImpl._containsWebServiceClients(WSModuleDescriptorImpl.java:639)
at
com.ibm.ws.websvcs.desc.WSModuleDescriptorImpl.containsWebServiceClients(WSModuleDescriptorImpl.java:611)
at
com.ibm.ws.websvcs.deploy.WSCacheWriter.writeModuleCache(WSCacheWriter.java:583)
at
com.ibm.ws.websvcs.deploy.WSCacheWriter.writeApplicationCache(WSCacheWriter.java:242)
at
com.ibm.ws.websvcs.deploy.WSCacheWriter.writeApplicationCache(WSCacheWriter.java:167)
at
com.ibm.ws.websvcs.deploy.PersistentStorageInstallSaveTask.performTask(PersistentStorageInstallSaveTask.java:196)
at
com.ibm.ws.management.application.sync.AppBinaryProcessor$ExpandApp.expand(AppBinaryProcessor.java:1770)
at
com.ibm.ws.management.application.sync.AppBinaryProcessor$AppBinThread.run(AppBinaryProcessor.java:1276)
at java.lang.Thread.run(Thread.java:811)
Caused by: java.lang.IllegalArgumentException
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at
com.ibm.ws.metadata.annotations.AnnotationConfigReader.getAnnotationData(AnnotationConfigReader.java:836)
... 18 more
(...){noformat}
Switching back to the older 1.7.25 version lets this error message disappear.
The reason is that Websphere (still) uses Java 8 which cannot parse / process
the {{module-info.class}} that was compiled with Java 9.
My WAR inside the EAR actually only uses {{slf4j-api-1.8.0-beta2.jar}} and
{{jcl-over-slf4j-1.8.0-beta2.jar}}, but I assume that all Jars containing this
file are affected.
Solution:
Move the class to {{META-INF/versions/9}} and mark the resulting jar as being a
multi-release jar. See the example in
[https://github.com/apache/maven-compiler-plugin/blob/master/src/it/multirelease-patterns/singleproject-runtime/pom.xml]
for how to do this
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