Affects PMD Version:
PMD 7.10.0 (db70a20, 2025-01-31T09:22:09Z)
Description:
Unknown error occurred while executing a PmdRunnable: java.lang.StackOverflowError
Exception Stacktrace:
Exception in thread "main" java.lang.StackOverflowError
at net.sourceforge.pmd.lang.java.types.SentinelType.acceptVisitor(SentinelType.java:66)
at net.sourceforge.pmd.lang.java.types.TypeOps.isSameType(TypeOps.java:134)
at net.sourceforge.pmd.lang.java.types.TypeOps.access$000(TypeOps.java:50)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.typeArgContains(TypeOps.java:769)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitClass(TypeOps.java:854)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitClass(TypeOps.java:586)
at net.sourceforge.pmd.lang.java.types.JClassType.acceptVisitor(JClassType.java:312)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.isConvertible(TypeOps.java:656)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.isConvertible(TypeOps.java:598)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitTypeVar(TypeOps.java:808)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitTypeVar(TypeOps.java:586)
at net.sourceforge.pmd.lang.java.types.JTypeVar.acceptVisitor(JTypeVar.java:103)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.isConvertible(TypeOps.java:656)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.isConvertible(TypeOps.java:598)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.typeArgContains(TypeOps.java:788)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitClass(TypeOps.java:854)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitClass(TypeOps.java:586)
at net.sourceforge.pmd.lang.java.types.JClassType.acceptVisitor(JClassType.java:312)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.isConvertible(TypeOps.java:656)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.isConvertible(TypeOps.java:598)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitTypeVar(TypeOps.java:808)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitTypeVar(TypeOps.java:586)
at net.sourceforge.pmd.lang.java.types.JTypeVar.acceptVisitor(JTypeVar.java:103)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.isConvertible(TypeOps.java:656)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.isConvertible(TypeOps.java:598)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.typeArgContains(TypeOps.java:788)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitClass(TypeOps.java:854)
at net.sourceforge.pmd.lang.java.types.TypeOps$SubtypeVisitor.visitClass(TypeOps.java:586)
at net.sourceforge.pmd.lang.java.types.JClassType.acceptVisitor(JClassType.java:312)
...
Code Sample demonstrating the issue:
package org.example;
import java.util.Collection;
import java.util.Collections;
import java.util.Optional;
public class Main {
public static <T extends Comparable<? super T>> Optional<T> getMaxElementCausesStackoverflow(Collection<? extends T> collection) {
return collection == null || collection.isEmpty() ? Optional.empty() : Optional.of(Collections.max(collection));
}
public static <T extends Comparable<? super T>> Optional<T> getMaxElementIsFine(Collection<? extends T> collection) {
return Optional.ofNullable(collection).filter(c -> !c.isEmpty()).map(Collections::max);
}
}
Steps to reproduce:
pmd check -d ./Main.java -R rulesets/java/quickstart.xml
Running PMD through: CLI
Java version: 21.0.2, vendor: Amazon.com Inc
OS: macOS 14.5
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