Jrun4 - 应用无法启动-jar包冲突

来源：互联网发布：一年制硕士知乎编辑：程序博客网时间：2024/04/30 08:29

因为JRrun4在国内很少使用，所以碰到问题在中文网站上很难找到。

使用google.com到英文网站上找，问题还是很容易解决的。

今天天碰到的两个问题：

1.提示 java.lang.ClassNotFoundException: org.apache.log4j.Layout

2. 提示：jrun.jsp.compiler.JRunTagLibraryInfo$InvalidTLDElementException: The tag function on line 14 is not a valid TLD element（这个问题Tomcat也会碰到）

问题原因：jrun4本身已经引入了一些jar包，在应用web-inf/lib里面再次引入jar包时导致冲突。

解决办法：删除web-inf/lib下相关的jar包

log4j-1.2.13.jar

xml-apis.jar

xmlParserAPIs.jar

standard.jar

错误日志距离：

Error:

06/19 10:30:31 error Could not pre-load servlet: JSPServlet

[2]jrun.jsp.compiler.JRunTagLibraryInfo$InvalidTLDElementException: The tag function on line 14 is not a valid TLD element

at jrun.jsp.compiler.JRunTagLibraryInfo$TLDParser.startElement(JRunTagLibraryInfo.java:627)

at jrunx.util.SAXReflectionHandler.startElement(SAXReflectionHandler.java:24)

at org.xml.sax.helpers.XMLReaderAdapter.startElement(XMLReaderAdapter.java:329)

at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1490)

at org.apache.crimson.parser.Parser2.content(Parser2.java:1779)

at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1507)

at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:500)

at org.apache.crimson.parser.Parser2.parse(Parser2.java:305)

at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:442)

at org.xml.sax.helpers.XMLReaderAdapter.parse(XMLReaderAdapter.java:223)

at javax.xml.parsers.SAXParser.parse(SAXParser.java:314)

at jrun.jsp.compiler.JRunTagLibraryInfo.init(JRunTagLibraryInfo.java:202

at jrun.jsp.compiler.JRunTagLibraryInfo.<init>(JRunTagLibraryInfo.java:130)

at jrun.jsp.JSPEngine.checkResourceForTaglibs(JSPEngine.java:460)

at jrun.jsp.JSPEngine.findImplicitTaglibs(JSPEngine.java:428)

at jrun.jsp.JSPEngine.<init>(JSPEngine.java:120)

at jrun.jsp.JSPServlet.init(JSPServlet.java:56)

at jrun.servlet.WebApplicationService.loadServlet(WebApplicationService.java:1208)

at jrun.servlet.WebApplicationService.preloadServlets(WebApplicationService.java:763)

at jrun.servlet.WebApplicationService.postStart(WebApplicationService.java:258)

at jrun.deployment.DeployerService.initModules(DeployerService.java:711)

at jrun.deployment.DeployerService.createWatchedDeployment(DeployerService.java:242)

at jrun.deployment.DeployerService.deploy(DeployerService.java:430)

at jrun.deployment.DeployerService.deployPersistentURL(DeployerService.java:1532)

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:324)

at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1628)

at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)

at jrunx.kernel.agents.JRunAdminService.invoke(JRunAdminService.java:126)

at sun.reflect.GeneratedMethodAccessor52.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:324)

at jrunx.rmi.RMIBroker.invokeService(RMIBroker.java:266)

at jrunx.rmi.RMIBroker.invoke(RMIBroker.java:130)

at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:324)

at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)

at sun.rmi.transport.Transport$1.run(Transport.java:148)

at java.security.AccessController.doPrivileged(Native Method)

at sun.rmi.transport.Transport.serviceCall(Transport.java:144)

at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)

at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)

at java.lang.Thread.run(Thread.java:536)

[1]jrun.jsp.compiler.JRunTagLibraryInfo$TLDParseException: Exception parsing the TLD null : The tag function on line 14 is not a valid TLD element

at jrun.jsp.compiler.JRunTagLibraryInfo.init(JRunTagLibraryInfo.java:210)