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Thread: How do I log exception when it is thrown

  1. #1
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    Default How do I log exception when it is thrown

    Here is the situation. When I throw an exception, I want my wrapper class to pick it up and put it into a database. (For simplicity I am just printing it in this example).
    However, when I throw the exception, the constructor for my exception subclass never gets called.

    public class SmartHomeXcp extends Exception
    {
        private final StackTraceElement trace[]; 
        private int sizeOfTrace;
        public SmartHomeXcp(String message)
        {
            super(message);
            trace = getStackTrace();
            sizeOfTrace = trace.length;
            printSize();
        }
     
        public void printSize()
        {
            System.out.println("Size " + sizeOfTrace);
            for(int i = 0; i < sizeOfTrace; i++)
            System.out.println("Trace: " + trace[0]);
            System.out.println("Did we make it here?");
        }
     
    }


    public class ExceptionGiver 
    {
        public static void causeException()
        {
             throw new SmartHomeXcp("Dude exception here!!!!");
        }
     
        public static void main(String[] args)
        {
            ExceptionGiver.causeException();
        }
    }


  2. #2
    Administrator copeg's Avatar
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    Default Re: How do I log exception when it is thrown

    However, when I throw the exception, the constructor for my exception subclass never gets called.
    I'm not sure what you mean - the code you posted won't even compile (Exceptions must be caught or thrown).

    When I throw an exception, I want my wrapper class to pick it up and put it into a database.
    If you wish to log exceptions, you might consider looking into a logging API such as Apache log4j. You can use a FileAppender or JDBCAppender to write to a file or database, respectively, without the need for a wrapper class.

  3. The Following User Says Thank You to copeg For This Useful Post:

    huntorotron (March 26th, 2014)

  4. #3
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    Default Re: How do I log exception when it is thrown

    Oh wow is it a compile error???
    I did not even notice that thank you... I thought it was the exception that I was getting in the red letters

  5. #4
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    Default Re: How do I log exception when it is thrown

    when you throw an Exception, I think you should also handle it, it is either you catch it or you throws it beside the method.
    example:
    public void doExceptions() throws Excetion {
         throw new Exception("balh blah blah");
    }
    or
    public void doException() {
         try {
                throw new Exception("blah blah blah");
         } cathc (Exception e) {
                // do something here
         }
    }

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