Error reading tld listeners

Problem :

Trying to run a web application (that makes use of the log4j framework) on tomcat, during start up, it complained of the following error…

SEVERE: Error reading tld listeners java.lang.NullPointerException
java.lang.NullPointerException
at org.apache.log4j.Category.isEnabledFor(Category.java:746)
at org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:327)
at org.apache.catalina.startup.TldConfig.tldScanResourcePaths(TldConfig.java:581)
at org.apache.catalina.startup.TldConfig.execute(TldConfig.java:282)
at org.apache.catalina.core.StandardContext.processTlds(StandardContext.java:4278 )
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4115)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:608 )
...

Solution 1:

Simply replace the commons-logging-1.1 jar with an older version, namely commons-loggin-1.0.4.jar.

Solution 2:

Edit the context.xml file residing under the META-INF folder (or create one if it doesn’t already exist), and turn off the tld processing as follows…

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/yourowncontextname" processTlds="false"/>

… where “yourowncontextname” is the context name your application will use to run in the browser under.

Wa’Allahu A’lam.

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