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I am loging error im my java swing application: logger.error("ERROR: " + ex); where ex is exception
this just print me 13:33:58,964 ERROR PlayOffPanel:292 - ERROR: java.lang.NullPointerException
but I wanna know stacktrace.
my log4j properites:
log4j.rootLogger=DEBUG,file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.maxFileSize=100KB
log4j.appender.file.maxBackupIndex=5
log4j.appender.file.File=error.log
log4j.appender.file.threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
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To print a stack trace to log you Should declare logger and method info(e. toString()) or log(Level.INFO, e. toString()). Logging is the process of writing log messages during the execution of a program to get error and warning messages as well as info messages.
printStackTrace() method prints this throwable and its backtrace to the standard error stream. It prints a stack trace for this Throwable object on the error output stream that is the value of the field System.
A stack trace shows the call stack (sets of active stack frames) and provides information on the methods that your code called. Usually, a stack trace is shown when an Exception is not handled correctly in code. (An exception is what a runtime environment uses to tell you that there's an error in your code.)
You have to write
logger.error("Error description",ex);
Look at the javadoc, the exception must be the second arguments if you want stacktrace.
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