log4j does not appear to append the stack trace onto the event before
passing it onto my appender. Here is a quick test I just did:
--CUT--- MyAppender.java - A CUSTOM APPENDER-----------------
import java.net.*;
import java.util.*;
import java.io.*;
import org.apache.log4j.*;
import org.apache.log4j.spi.*;
import org.apache.log4j.helpers.LogLog;
public class MyAppender extends AppenderSkeleton
{
private Layout forcedLayout;
private boolean init=false;
public MyAppender(){}
public boolean requiresLayout(){return false;}
public void close(){}
/************************/
private void init_vars()
{
forcedLayout=new PatternLayout("%p %c %m");
init=true;
}
/************************/
protected void append(LoggingEvent event)
{
if (! init)
init_vars();
System.out.println("JUST TESTIN: "+ forcedLayout.format(event));
}
/************************/
}
--CUT--- MyAppender.java - A CUSTOM APPENDER-----------------
---CUT --- MyTest..java ---
import org.apache.log4j.*;
public class MyTest
{
public static void main(String[] args) throws Exception
{
Logger logger=Logger.getLogger(MyTest.class.getName());
BasicConfigurator.configure();
logger.debug("hi");
String[] bad=new String[1];
try
{
bad[2]="bomb";
}
catch(Exception e)
{
logger.fatal("hopefully there is a stack trace:",e);
}
}
}
---CUT --- MyTest..java ---
--CUT --- log4j.properties ----
log4j.rootLogger=DEBUG, MyAppender
log4j.appender.MyAppender=MyAppender
--CUT --- log4j.properties ----
OUTPUT of run:
13:24:06 aspit...@alex:~> java -cp log4j-1.2.9.jar:. MyTest
JUST TESTIN: DEBUG MyTest hi
0 [main] DEBUG MyTest - hi
JUST TESTIN: FATAL MyTest hopefully there is a stack trace:
7 [main] FATAL MyTest - hopefully there is a stack trace:
java.lang.ArrayIndexOutOfBoundsException: 2
at MyTest.main(MyTest.java:14)
You can see that my "JUST TESTIN" appender only shows the string, and
not the exception stack trace.
-alex spitzer
Cell: 617.407.2274
AIM: AlexSpitzer
On Mon, Sep 28, 2009 at 12:51 PM, Simon Gibbs <[email protected]> wrote:
> Alexander Spitzer wrote:
>> if they use
>> logger.error("this is an error",myException)
>>
> .. then the exception is added to the event and passed to the appender
> as 1 parameter.
>
> perhaps the appender is going wrong when dealing with this data, try
> debugging the appender. The logger code is right (and is not subject to
> change anyway).
>
> logger != appender :-)
>
> Simon
>
>
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