Re: [Wrapper-user] Wrapper as Linux daemon

[Leif M. <le...@ta...>]

Yuval,

Yuval Zantkeren wrote:

>I fixed the problem it was again as you said the java was not configure
>properly in the wrapper.conf file.
>  
>
Great glad you got things working.

>I have one more question, How do I debug the errors that I receive I see it
>like this in the log:
>INFO   | jvm 1    | 2004/03/22 20:04:27 | Error:
>java.lang.NullPointerException
>  
>
Where is the above message coming from?  I am pretty sure that is not 
from the
Wrapper code.   Most likely you have some code like the following:
try {
  // Do something that is broken
} catch ( Exception e ) {
    System.out.println( "Error: " + e );
}

The problem with the above is that it will tell you that you had an 
exception, but not
what it is.   If you want to get a stack trace, and you do, then you 
should do the
following.
try {
  // Do something that is broken
} catch ( Exception e ) {
    System.out.println( "Error: " + e );
    e.printStackTrace();
}

The stack trace will then let you find where in your program the 
exception is being
thrown.

Logging tools make the above a lot cleaner.


>how can I get more details about the error? If I configure
>wrapper.debug=true will help?
>  
>
It depends where the error is coming from.  setting debug to true only 
helps with Wrapper
related problems.  The above was in your log file anyways wasn't it?

Cheers,
Leif