java data_error ai_generated true

org.opentest4j.AssertionFailedError: Expected java.lang.RuntimeException to be thrown, but java.lang.NullPointerException was thrown

ID: java/junit-assert-throws-wrong-type

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80%Fix Rate
82%Confidence
0Evidence
2024-12-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
8+ active — — —

Root Cause

assertThrows expects a specific exception type, but a different exception is thrown.

generic

中文

assertThrows 期望特定的异常类型，但抛出了不同的异常。

Workarounds

  1. 95% success Use assertThrows with correct exception type 
    assertThrows(NullPointerException.class, () -> {
    // code that throws NPE
});
  2. 80% success Use assertThrowsAny for multiple exception types 
    assertThrowsAny(RuntimeException.class, () -> {
    // code
});

Dead Ends

Common approaches that don't work:

  1. Catching the actual exception and ignoring 60% fail

    Test passes incorrectly; real exception type mismatch is hidden.

  2. Changing expected type to Exception 50% fail

    Too broad; may hide other issues.