I am seeing this issue with PMD 6.11.0, using Java 8. It happens sometimes on our CI server, but I was unable to reproduce it consistently for now.
PMD is configured to use 8 threads on an 8 cores machine.
Here's the relevant part from a stack trace.
net.sourceforge.pmd.PMDException: Error while processing
at net.sourceforge.pmd.SourceCodeProcessor.processSourceCode(SourceCodeProcessor.java:102)
at net.sourceforge.pmd.SourceCodeProcessor.processSourceCode(SourceCodeProcessor.java:51)
at net.sourceforge.pmd.processor.PmdRunnable.call(PmdRunnable.java:78)
at net.sourceforge.pmd.processor.PmdRunnable.call(PmdRunnable.java:24)
...
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
at java.util.ArrayList.add(ArrayList.java:463)
at net.sourceforge.pmd.lang.java.typeresolution.typedefinition.JavaTypeDefinitionSimple.getGenericType(JavaTypeDefinitionSimple.java:138)
at net.sourceforge.pmd.lang.java.typeresolution.typedefinition.JavaTypeDefinitionSimple.getGenericType(JavaTypeDefinitionSimple.java:107)
at net.sourceforge.pmd.lang.java.typeresolution.typedefinition.JavaTypeDefinitionSimple.getGenericType(JavaTypeDefinitionSimple.java:97)
at net.sourceforge.pmd.lang.java.typeresolution.typedefinition.JavaTypeDefinitionSimple.resolveTypeDefinition(JavaTypeDefinitionSimple.java:183)
at net.sourceforge.pmd.lang.java.typeresolution.typedefinition.JavaTypeDefinitionSimple.resolveTypeDefinition(JavaTypeDefinitionSimple.java:177)
at net.sourceforge.pmd.lang.java.typeresolution.typedefinition.JavaTypeDefinitionSimple.resolveTypeDefinition(JavaTypeDefinitionSimple.java:157)
at net.sourceforge.pmd.lang.java.typeresolution.MethodTypeResolution.getApplicableMethods(MethodTypeResolution.java:481)
at net.sourceforge.pmd.lang.java.typeresolution.ClassTypeResolver.visit(ClassTypeResolver.java:387)
at net.sourceforge.pmd.lang.java.ast.ASTName.jjtAccept(ASTName.java:35)
...
Maybe this is a data race in the lazy initialization of a JavaTypeDefinitionSimple.genericArgs?
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