java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils是什么问题,lang3stringutils
java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils是什么问题,lang3stringutils
今天遇到了两个问题:
1.tomcat的端口被占用了怎么办?
解决方法:1)
这里就以win7为例进行讲解。
首先在开始菜单中直接输入cmd回车即可。同样也可以按下win+R打开运行,然后输入cmd即可。
在dos命令中输入命令:netstat -ano命令查询正在被使用的端口号以及使用它的程序。前面的程序占用的进程,找到本地地址那列,并找到以:8080结尾的PID的值
方法2:修改tomcat的端口,就是不用8080端口了,改用其他没有被占用的端口(前提下是确保你所用的端口没有被占用) 步骤如下: 打开 安装tomcat的目录-->找到config/sever.xml这个文件并打开 找到这个Connector节点 <Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"/> 然后修改port的属性值就行了
2.第二个问题是如果Struts2中出现java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils()错误怎么办
2013-4-7 10:13:56 org.apache.catalina.startup.HostConfig checkResources
信息: Reloading context [/chapter05-1]
2013-4-7 10:13:56 org.apache.catalina.core.StandardContext stop
信息:
Container org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/chapter05-1] has not been started
2013-4-7 10:13:56 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Parsing configuration file [struts-default.xml]
2013-4-7 10:13:56 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
Java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:209)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:102)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:210)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:115)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4072)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4726)
at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1284)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1382)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:306)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1389)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1653)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1662)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1642)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang3.StringUtils
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
... 22 more
2013-4-7 10:13:56 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2013-4-7 10:13:56 org.apache.catalina.core.StandardContext start
严重: Context [/chapter05-1] startup failed due to previous errors
怎么回事呢?那是你导少了一个包,那就是commons-lang3-3.1.jar
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