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From Bob Jacobsen <Bob_Jacob...@lbl.gov>
Subject Re: Log4J logging then stops; due to multiple root categories?
Date Sat, 04 Aug 2001 18:56:50 GMT
Thank you!  That was exactly the clue I needed to track this down!

In case anybody encounters this particular problem again, log4j works 
fine if you initialize it _after_ JUnit, rather than before. 
Specifically, if you put the log4j initialization in the base 
testsuite definition (the public static Test suite() {} that appears 
in the class that initializes JUnit), it works fine.

Bob



At 10:28 AM +0200 8/4/01, Ceki Gülcü wrote:
>Hello Bob,
>
>There is only one line of code that creates the root category and it 
>is called when Category class is initialized. You probably have a 
>situation where the Category class is loaded by multiple 
>classloaders. I believe that junit uses its  own class loader which 
>explains what you are seeing. Regards, Ceki
>
>At 15:33 03.08.2001 -0700, Bob Jacobsen wrote:
>>I have a program where Log4J starts up fine with a basic configuration,
>>logging to std output, and then seems to forget how to log.  When I look
>>closer, the problem seems to be due to multiple root category objects
>>being created.  Example output:
>>
>>   51 [Thread-2] INFO jmri  - Test message
>>   log4j:ERROR No appenders could be found for category 
>>(jmri.tests.symbolicprog.SymbolicProgTest).
>>   log4j:ERROR Please initialize the log4j system properly.
>>
>>Note that it was logging OK, then seems to have lost its configuration.
>>
>>I've put the details below, in case I've made a mistake in my reasoning,
>>but it looks to me like later Category.getInstance(...) calls get confused
>>and create a new root Category object instead of using an existing
>>configured one.
>>
>>Can anybody suggest how I can debug this?
>>
>>Bob
>>
>>
>>
>>Details:
>>
>>In my main class, I've got:
>>
>>    static org.apache.log4j.Category log = 
>>org.apache.log4j.Category.getInstance("jmri");
>>
>>In the main proc itself, I initialize log4j & immediately test it:
>>
>>    org.apache.log4j.BasicConfigurator.configure();
>>    log.info("Test message");
>>    System.out.println("log4j "+org.apache.log4j.Category.getRoot());
>>
>>At this point, life is good.  Std output gets:
>>
>>    0 [Thread-2] INFO jmri.progdebugger.ProgDebugger  - Test message
>>    log4j org.apache.log4j.spi.RootCategory@294279a
>>
>>Note the address of the RootCategory object above.
>>
>>I then start JUnit, which eventually gets to a specific
>>SymbolicProgTest test class that contains
>>
>>    static org.apache.log4j.Category log = 
>>org.apache.log4j.Category.getInstance(SymbolicProgTest.class.getName());
>>
>>The full name of the SymbolicProgTest is 
>>jmri.tests.symbolicprog.SymbolicProgTest.
>>One of its tests includes a log4j request of the form:
>>
>>    log.info("message from log4j");
>>    System.out.println("log4j "+org.apache.log4j.Category.getRoot());
>>
>>where I added that second statement to debug this problem.  The std 
>>output gets:
>>
>>    log4j:ERROR No appenders could be found for category 
>>(jmri.tests.symbolicprog.SymbolicProgTest).
>>    log4j:ERROR Please initialize the log4j system properly.
>>    log4j org.apache.log4j.spi.RootCategory@282434d
>>
>>Note that the RootCategory object's address in the third line is _different_
>>from what was seen earlier.  That's what makes me believe that 
>>log4j is creating
>>multiple roots.
>>
>>System specifics:  Macintosh OS 9.1 with MRJ 2.2.5; log4j 1.1.3 using
>>distributed .jar file; java compiler is CodeWarrior most recent patch level.
>>
>>Any help, even debugging pointers, would be greatly appreciated.
>>
>>Bob
>>--
>>--------------
>>Bob Jacobsen (Bob_Jacobsen@lbl.gov, 510-486-7355, fax 510-495-2957)
>>Working off large email backlog from trip; if its urgent, call!
>>
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>
>--
>Ceki Gülcü - http://qos.ch
>
>
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-- 
--------------
Bob Jacobsen (Bob_Jacobsen@lbl.gov, 510-486-7355, fax 510-495-2957)
Working off large email backlog from trip; if its urgent, call!

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