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Showing content from https://github.com/pmd/pmd/issues/4383 below:

Object is not an array type! · Issue #4383 · pmd/pmd · GitHub

Affects PMD Version:

6.50.0 - 6.54.0
I cannot reproduce the error in 6.49.0.

Description:

When analyzing the source code below I sometimes get 'PMDException: Error while processing' caused by an IllegalStatementException. Most of the times it works just fine, but then after 3-10 successfully runs the error appears. Maybe a race condition somewhere?

Exception Stacktrace:

net.sourceforge.pmd.PMDException: Error while processing C:\Tmp\pmd\src\org\example\Main.java
        at net.sourceforge.pmd.SourceCodeProcessor.processSourceCodeWithoutCache(SourceCodeProcessor.java:128)
        at net.sourceforge.pmd.SourceCodeProcessor.processSourceCode(SourceCodeProcessor.java:100)
        at net.sourceforge.pmd.SourceCodeProcessor.processSourceCode(SourceCodeProcessor.java:62)
        at net.sourceforge.pmd.processor.PmdRunnable.call(PmdRunnable.java:89)
        at net.sourceforge.pmd.processor.PmdRunnable.call(PmdRunnable.java:30)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.IllegalStateException: Object is not an array type!
        at net.sourceforge.pmd.lang.java.typeresolution.typedefinition.JavaTypeDefinitionSimple.getComponentType(JavaTypeDefinitionSimple.java:243)
        at net.sourceforge.pmd.lang.java.typeresolution.MethodType.getVarargComponentType(MethodType.java:63)
        at net.sourceforge.pmd.lang.java.typeresolution.MethodType.getArgTypeIncludingVararg(MethodType.java:74)
        at net.sourceforge.pmd.lang.java.typeresolution.MethodTypeResolution.checkSubtypeability(MethodTypeResolution.java:111)
        at net.sourceforge.pmd.lang.java.typeresolution.MethodTypeResolution.selectMostSpecificMethod(MethodTypeResolution.java:418)
        at net.sourceforge.pmd.lang.java.typeresolution.MethodTypeResolution.getBestMethodReturnType(MethodTypeResolution.java:388)
        at net.sourceforge.pmd.lang.java.typeresolution.ClassTypeResolver.visit(ClassTypeResolver.java:467)
        at net.sourceforge.pmd.lang.java.ast.ASTName.jjtAccept(ASTName.java:38)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:403)
        at net.sourceforge.pmd.lang.java.typeresolution.ClassTypeResolver.visit(ClassTypeResolver.java:1132)
        at net.sourceforge.pmd.lang.java.ast.ASTPrimaryPrefix.jjtAccept(ASTPrimaryPrefix.java:48)
        at net.sourceforge.pmd.lang.java.typeresolution.ClassTypeResolver.visit(ClassTypeResolver.java:956)
        at net.sourceforge.pmd.lang.java.ast.ASTPrimaryExpression.jjtAccept(ASTPrimaryExpression.java:25)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:298)
        at net.sourceforge.pmd.lang.java.typeresolution.ClassTypeResolver.visit(ClassTypeResolver.java:816)
        at net.sourceforge.pmd.lang.java.ast.ASTExpression.jjtAccept(ASTExpression.java:37)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:538)
        at net.sourceforge.pmd.lang.java.ast.ASTReturnStatement.jjtAccept(ASTReturnStatement.java:25)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:448)
        at net.sourceforge.pmd.lang.java.ast.ASTStatement.jjtAccept(ASTStatement.java:25)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:463)
        at net.sourceforge.pmd.lang.java.ast.ASTBlockStatement.jjtAccept(ASTBlockStatement.java:25)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:458)
        at net.sourceforge.pmd.lang.java.ast.ASTBlock.jjtAccept(ASTBlock.java:27)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:238)
        at net.sourceforge.pmd.lang.java.ast.ASTMethodDeclaration.jjtAccept(ASTMethodDeclaration.java:37)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:58)
        at net.sourceforge.pmd.lang.java.ast.ASTClassOrInterfaceBodyDeclaration.jjtAccept(ASTClassOrInterfaceBodyDeclaration.java:44)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:53)
        at net.sourceforge.pmd.lang.java.ast.ASTClassOrInterfaceBody.jjtAccept(ASTClassOrInterfaceBody.java:35)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:23)
        at net.sourceforge.pmd.lang.java.ast.ASTClassOrInterfaceDeclaration.jjtAccept(ASTClassOrInterfaceDeclaration.java:55)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:208)
        at net.sourceforge.pmd.lang.java.typeresolution.ClassTypeResolver.visit(ClassTypeResolver.java:258)
        at net.sourceforge.pmd.lang.java.ast.ASTTypeDeclaration.jjtAccept(ASTTypeDeclaration.java:39)
        at net.sourceforge.pmd.lang.java.ast.AbstractJavaNode.childrenAccept(AbstractJavaNode.java:62)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:13)
        at net.sourceforge.pmd.lang.java.ast.JavaParserVisitorAdapter.visit(JavaParserVisitorAdapter.java:183)
        at net.sourceforge.pmd.lang.java.typeresolution.ClassTypeResolver.visit(ClassTypeResolver.java:229)
        at net.sourceforge.pmd.lang.java.ast.ASTCompilationUnit.jjtAccept(ASTCompilationUnit.java:44)
        at net.sourceforge.pmd.lang.java.typeresolution.TypeResolutionFacade.initializeWith(TypeResolutionFacade.java:21)
        at net.sourceforge.pmd.lang.java.AbstractJavaHandler$5.start(AbstractJavaHandler.java:121)
        at net.sourceforge.pmd.SourceCodeProcessor.usesTypeResolution(SourceCodeProcessor.java:178)
        at net.sourceforge.pmd.SourceCodeProcessor.processSource(SourceCodeProcessor.java:205)
        at net.sourceforge.pmd.SourceCodeProcessor.processSourceCodeWithoutCache(SourceCodeProcessor.java:118)
        ... 10 more

Code Sample demonstrating the issue:

package org.example;

import org.apache.commons.lang3.ArrayUtils;

public final class Main {
	
    private Main() {}
	
    public static void main(final String[] args) {
        final byte[] a = new byte[]{1, 2, 3};
        final byte[] b = new byte[]{4, 5, 6};

        concatByteArrays(a, b);
    }

    public static byte[] concatByteArrays(final byte[] array1, final byte[] array2) {
        return ArrayUtils.addAll(array1, array2);
    }
}

Steps to reproduce:

Please provide detailed steps for how we can reproduce the bug.

pmd.bat -f text -R rulesets/java/quickstart.xml --no-cache -d <src_dir>
Execute the above command repeatably until it print outs 'PMDException: Error while processing'

JDK 18, Windows 11

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