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  1. logback
  2. LOGBACK-1223

Nested exception message is printed null instead of toString()

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    Description

      When nested exceptions are used and the exception does not have a message, logback library prints null. However, the expected detail should be calling toString() instead of printing null. Difference is evident between logback library and java logging library. 

      class TestException extends Exception
        {
            private String exceptionCode;
            private String exceptionMessage;

            @Override
            public String toString()
            {
                return "TestException [exceptionCode=" + exceptionCode + ", exceptionMessage=" + exceptionMessage + "]";
            }
        }

        try
        {
            TestException testException = new TestException();
            testException.exceptionCode = "Test exception code";
            testException.exceptionMessage = "Test exception message";
            throw new IOException("Io message", testException);
        }
        catch (Exception e)
        {
            logger.error("Error message ", e);
            java.util.logging.Logger.getAnonymousLogger().log(java.util.logging.Level.SEVERE, "Error message", e);
        }

      Prints the nested exceptions as:

      // SLF4J logging
java.io.IOException: Io message
    at test.Test.testMethod(Test.java:224)
    at test.Test.main(Test.java:119)
Caused by: test.Test$1TestException: null
    at test.Test.testMethod(Test.java:221)
    ... 1 common frames omitted
Nov 17, 2016 11:52:04 AM test.Test testMethod

// Java Util logging
SEVERE: Error message
java.io.IOException: Io message
    at test.Test.testMethod(Test.java:224)
    at test.Test.main(Test.java:119)
Caused by: TestException [exceptionCode=Test exception code, exceptionMessage=Test exception message]
    at test.Test.testMethod(Test.java:221)
    ... 1 more

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            logback-dev Logback dev list
            sudharsannr Sudharsan Rajagopal
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            Dates

              Created:
              Updated: