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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=11570 XML Appender throws NullPointerException when logging null Summary: XML Appender throws NullPointerException when logging null Product: Log4j Version: 1.2 Platform: PC OS/Version: Linux Status: NEW Severity: Critical Priority: Other Component: Appender AssignedTo: [EMAIL PROTECTED] ReportedBy: [EMAIL PROTECTED] Overview Description: When calling log.error(null), a NullPointerException is thrown. See the stack trace below. Of course, I wasn't calling log.error(null) in my code. Rather, I was logging an exception message as such: log.error(e.getMessage()) <-- triggered exception But the exception message was null so log4j threw an NullPointerException. Steps to Reproduce: 1. Setup the following XML Appender section in your log4j.properties file. ######## XML SECTION ################## # XML is a RollingFileAppender ####################################### log4j.appender.XML=org.apache.log4j.RollingFileAppender log4j.appender.XML.file=${base-path}logs/mgr_log.xml log4j.appender.XML.MaxFileSize=20MB log4j.appender.XML.MaxBackupIndex=5 log4j.appender.XML.layout=org.apache.log4j.xml.XMLLayout log4j.appender.XML.append=true 2. Create a class with the following line: log.error(null) 3. Or use the following try/catch block try { throw new Exception(); } catch (Exception e) { log.error(e, e); // works as expected log.error("bug found", e); // works as expected log.error(e.getMessage()); // throws NullPointerException log.error(e.getMessage(), e); // throws NullPointerException } Actual Results: A NullPointerException is thrown as represented in the following stack trace: ######### Stack Trace ############### java.lang.NullPointerException at org.apache.log4j.helpers.Transform.appendEscapingCDATA(Transform.java:74) at org.apache.log4j.xml.XMLLayout.format(Unknown Source) at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292) at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.java:225) at org.apache.log4j.WriterAppender.append(WriterAppender.java:150) at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221) at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:57) at org.apache.log4j.Category.callAppenders(Category.java:187) at org.apache.log4j.Category.forcedLog(Category.java:372) at org.apache.log4j.Category.error(Category.java:286) at com.bluearc.mgr.screens.Index.doThroughput(Index.java:253) Expected Results: An XML formatted message should have been logged to mgr_log.xml with an empty CDATA section. Similar to: <log4j:message>![CDATA[]]</log4j:message> or <log4j:message></log4j:message> Build & Platform: build: Log4j version 1.2.5 (release ver) platform: RedHat 7.2 & Windows 2000 with JDK 1.3.1_02 Additional Builds and Platforms: - Occurs On Log4j version 1.2.6 Additional Information: - xerces1_4_4.jar and xalan-j_2_4_D1.jar in classpath. -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
