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Showing content from https://github.com/pmd/pmd/issues/2783 below:

[java] Error while parsing with lambda of custom interface · Issue #2783 · pmd/pmd · GitHub

Affects PMD Version: 6.21.0

Description:

A PMDException occurs with the message "Error while parsing ..."
The code sample below can be used to reproduce the issue. I have reduced the code as much as possible.
Further changes will make the error go away, such as

• remove the cast
• remove the second parameter of the interface method
• Simplify the lambda to one line (without the braces and return)

Maybe this helps when analyzing the issue.

Code Sample demonstrating the issue:

import java.util.List;

public class PMDError {

  public Spec<String> test() {
    return (Spec<String>) (a, b) -> {
      return a.toArray(String[]::new);
    };
  }

  public interface Spec<T> {
    String[] process(List<T> var1, List<?> var2);
  }
}

Steps to reproduce:

1. ... running pmd:check using the maven-pmd-plugin on the above code
2. ... A warning is printed on the console with the PMDException message

Running PMD through: Maven

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