Hi,
Need advice from professionals here… I’m
stuck! L
I’m using log4j, and my logs are rotating
quite fast, so if an error occurs, for example in the middle of the night, it
will not be present in the log in the morning when I arrive to check for
errors.
So I decided to extract the errors live,
when they occur, and make them go to another file.
But since errors just on their own does not
say much of where the program were and what was the variables right then, I’d
also like to attach some history before the error in the error.log-file.
So I wrote a class to support this feature.
It’s a spy really. It’s attaching to an existing logger, and adding another
appender, which I use to create history and outputting to another
error.log-file when I need to.
A little more details on the spyclass
are:
I’m calling my usual logger X, and I’ve
created another loggerclass Y, which attaches another appender on my X.
For each logger call with X, I also call my
Y which is getting the string too, because it’s snooping on X, via this
appender I added. Y is also keeping a circularbuffer of history of all logging
it gets.
When Y is called with error, fatal or warn,
it will do a dump of the history and lastly, the erranous line, and all this to
another file, error.log.
That way I will get my usual log in
blabla.log, and for each warn, error /fatal, I get a few lines of history + the
error/warn/fatal-line that is to be noticed.
My problem:
BUT, I get out of heapmemory when using it
after a while.
I cannot find the error causing it. Mayber
I’m misusing the appender or log4j?
I’ve attached the historymaking class
“ErrorLogger.java”, and an example (test.java) of how the calls are made.
Exception in thread "Thread-5"
java.lang.OutOfMemoryError: Java heap space
at
java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:99)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:393)
at
java.lang.StringBuffer.append(StringBuffer.java:225)
at java.io.StringWriter.write(StringWriter.java:79)
at org.apache.log4j.helpers.QuietWriter.write(QuietWriter.java:47)
at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:301)
at org.apache.log4j.WriterAppender.append(WriterAppender.java:159)
at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:230)
at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:65)
at org.apache.log4j.Category.callAppenders(Category.java:203)
at org.apache.log4j.Category.forcedLog(Category.java:388)
at org.apache.log4j.Category.debug(Category.java:257)
at com.sttcare.alarmSwitch.JmsTester.activeMqIsUp(JmsTester.java:88) calls connection.stop();
So it really has nothing with log4j, I guess the heap is just ended right then.
at
com.sttcare.alarmSwitch.systemWatch.ProgramChecker.activeMQWorks(ProgramChecker.java:143)
at
com.sttcare.alarmSwitch.systemWatch.ProgramChecker.run(ProgramChecker.java:119)
at java.lang.Thread.run(Thread.java:595)
Seems to me something is exandCapacity too
much…
/Johan
_______________
Johan Sandgren
Svep Design Center AB
Phone +46 46 192 722
Mobile +46 70 173
4152
Box 1233, 221 05
Lund,
Sweden
E-mail jsa <at> svep.se
Website www.svep.se