Error reading tld listeners java.lang.NullPointerException

錯誤提示

1. 啓動的時候

嚴重: Error reading tld listeners java.lang.NullPointerException
java.lang.NullPointerException
    at org.apache.log4j.Category.isEnabledFor(Category.java:737)
    at org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:333)
    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:4307)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4144)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:927)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:890)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1150)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:448)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)

2.程序運行時

嚴重: Error reading tld listeners java.lang.NullPointerException
java.lang.NullPointerException
    at org.apache.log4j.Category.isEnabledFor(Category.java:737)
    at org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:333)
    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:4307)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4144)
    at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3025)
    at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:432)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1278)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1570)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1579)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1579)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1559)
    at java.lang.Thread.run(Thread.java:619)
原因是包的衝突

解決方案一

在pom.xml

        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
            <version>1.2</version>  
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.2.1</version>
        </dependency>   

web.xml的設置

    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderServlet
        </listener-class>
    </listener>

解決方案二

在pom.xml

        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
            <version>1.2</version>
            <exclusions>
                <exclusion>
                    <groupId>xerces</groupId>
                    <artifactId>xerces</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.2.1</version>
            <exclusions>
                <exclusion>
                    <groupId>xerces</groupId>
                    <artifactId>xerces</artifactId>
                </exclusion>
            </exclusions>
        </dependency>   

在web.xml

    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>

 

本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/moliqin/archive/2010/04/16/5493878.aspx