关于jbpm4.4的el的问题 de.odysseus.el.ExpressionFactoryImpl找不到问题

第一份工作中遇到这个问题，项目中使用到工作流框架activiti 调试发现报错

控制台报de.odysseus.el.ExpressionFactoryImpl找不到问题
在网上查找后发现JBMP在iteye开了个官方群组回答了这个问题，给出了解决办法

ckxtl的博客: ckxtl 2010-09-21  还是菜鸟问题. 项目中如果加入了juel-api.jar,juel-impl.jar,(juel-engine.jar)在打开jsp页面的时候报这个错误.javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature org.apache.jasper.servlet.JspServlet.service(JspServlet.java:257) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) root cause java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature org.apache.jsp.index_jsp._jspInit(index_jsp.java:22) org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52) org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:154) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 如果不加入这三个jar,在打开jsp的时候不会报错,但是在新流程发布的时候报下面这个错误. org.apache.jasper.JasperException: org.jbpm.api.JbpmException:   error: parsing exception: expression factory class not found : javax.el.ELException: expression factory class not found org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:515)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) root cause org.jbpm.api.JbpmException:   error: parsing exception: expression factory class not found : javax.el.ELException: expression factory class not found org.jbpm.pvm.internal.xml.ProblemList.getJbpmException(ProblemList.java:175) org.jbpm.pvm.internal.xml.ProblemList.getJbpmException(ProblemList.java:141) org.jbpm.pvm.internal.repository.DeployerManager.deploy(DeployerManager.java:50) org.jbpm.pvm.internal.repository.RepositorySessionImpl.deploy(RepositorySessionImpl.java:62)org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:47) org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:33) org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42) org.jbpm.pvm.internal.tx.SpringCommandCallback.doInTransaction(SpringCommandCallback.java:45)org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)org.jbpm.pvm.internal.tx.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:49)org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53)org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40) org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:56) org.jbpm.pvm.internal.repository.DeploymentImpl.deploy(DeploymentImpl.java:90) org.apache.jsp.holiday.deploy_005fzip_jsp._jspService(deploy_005fzip_jsp.java:70) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) root cause javax.el.ELException: expression factory class not found org.jbpm.pvm.internal.el.FactoryFinder.newInstance(FactoryFinder.java:63) org.jbpm.pvm.internal.el.FactoryFinder.find(FactoryFinder.java:118) org.jbpm.pvm.internal.el.JbpmElFactoryImpl.createExpressionFactory(JbpmElFactoryImpl.java:111)org.jbpm.pvm.internal.el.Expression.initExpressionObjects(Expression.java:100) org.jbpm.pvm.internal.el.Expression.create(Expression.java:67) org.jbpm.jpdl.internal.xml.JpdlParser.parseAssignmentAttributes(JpdlParser.java:528) org.jbpm.jpdl.internal.xml.JpdlParser.parseTaskDefinition(JpdlParser.java:593) org.jbpm.jpdl.internal.activity.TaskBinding.parseJpdl(TaskBinding.java:45) org.jbpm.jpdl.internal.activity.JpdlBinding.parse(JpdlBinding.java:45) org.jbpm.jpdl.internal.xml.JpdlParser.parseActivities(JpdlParser.java:320) org.jbpm.jpdl.internal.xml.JpdlParser.parseDocumentElement(JpdlParser.java:248) org.jbpm.pvm.internal.xml.Parser.parseDocument(Parser.java:480) org.jbpm.pvm.internal.xml.Parser.execute(Parser.java:432) org.jbpm.pvm.internal.xml.Parse.execute(Parse.java:158) org.jbpm.pvm.internal.repository.ProcessDeployer.deploy(ProcessDeployer.java:68) org.jbpm.pvm.internal.repository.DeployerManager.deploy(DeployerManager.java:46) org.jbpm.pvm.internal.repository.RepositorySessionImpl.deploy(RepositorySessionImpl.java:62)org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:47) org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:33) org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42) org.jbpm.pvm.internal.tx.SpringCommandCallback.doInTransaction(SpringCommandCallback.java:45)org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)org.jbpm.pvm.internal.tx.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:49)org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53)org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40) org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:56) org.jbpm.pvm.internal.repository.DeploymentImpl.deploy(DeploymentImpl.java:90) org.apache.jsp.holiday.deploy_005fzip_jsp._jspService(deploy_005fzip_jsp.java:70) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) root cause java.lang.ClassNotFoundException: de.odysseus.el.ExpressionFactoryImpl java.net.URLClassLoader$1.run(Unknown Source) java.security.AccessController.doPrivileged(Native Method) java.net.URLClassLoader.findClass(Unknown Source) java.lang.ClassLoader.loadClass(Unknown Source) java.lang.ClassLoader.loadClass(Unknown Source) org.jbpm.pvm.internal.el.FactoryFinder.newInstance(FactoryFinder.java:60) org.jbpm.pvm.internal.el.FactoryFinder.find(FactoryFinder.java:118) org.jbpm.pvm.internal.el.JbpmElFactoryImpl.createExpressionFactory(JbpmElFactoryImpl.java:111)org.jbpm.pvm.internal.el.Expression.initExpressionObjects(Expression.java:100) org.jbpm.pvm.internal.el.Expression.create(Expression.java:67) org.jbpm.jpdl.internal.xml.JpdlParser.parseAssignmentAttributes(JpdlParser.java:528) org.jbpm.jpdl.internal.xml.JpdlParser.parseTaskDefinition(JpdlParser.java:593) org.jbpm.jpdl.internal.activity.TaskBinding.parseJpdl(TaskBinding.java:45) org.jbpm.jpdl.internal.activity.JpdlBinding.parse(JpdlBinding.java:45) org.jbpm.jpdl.internal.xml.JpdlParser.parseActivities(JpdlParser.java:320) org.jbpm.jpdl.internal.xml.JpdlParser.parseDocumentElement(JpdlParser.java:248) org.jbpm.pvm.internal.xml.Parser.parseDocument(Parser.java:480) org.jbpm.pvm.internal.xml.Parser.execute(Parser.java:432) org.jbpm.pvm.internal.xml.Parse.execute(Parse.java:158) org.jbpm.pvm.internal.repository.ProcessDeployer.deploy(ProcessDeployer.java:68) org.jbpm.pvm.internal.repository.DeployerManager.deploy(DeployerManager.java:46) org.jbpm.pvm.internal.repository.RepositorySessionImpl.deploy(RepositorySessionImpl.java:62)org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:47) org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:33) org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42) org.jbpm.pvm.internal.tx.SpringCommandCallback.doInTransaction(SpringCommandCallback.java:45)org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)org.jbpm.pvm.internal.tx.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:49)org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53)org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40) org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:56) org.jbpm.pvm.internal.repository.DeploymentImpl.deploy(DeploymentImpl.java:90) org.apache.jsp.holiday.deploy_005fzip_jsp._jspService(deploy_005fzip_jsp.java:70) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter 昨天晚上查这个问题查到两点多,在网上找到这么一句话"所有与el表达式相关的部分都替换为新加的org.jbpm.pvm.internal.el.Expression。"请教各位,如何将el表达式相关的部分替换为org.jbpm.pvm.internal.el.Expression xznsoft的博客: xznsoftxznsoft 2010-09-21删除juel-api.jar包即可，因为它和tomcat的lib目录下el-api.jar冲突ckxtl的博客: ckxtl 2010-09-21我使用的是jboss5.1,不是tomcat 我的环境: JDK 1.6 JBOSS 5.1 SPRING3.04 JBPM4.4 我项目引用的包如下: activation.jar antlr.jar cglib.jar commons-collections.jar commons-logging.jar dom4j.jar dwr.jar hibernate-core.jar jbpm.rar jbpm-bpmn.rar jbpm-console-form-plugin.jar jbpm-console-graphView-plugin.jar jbpm-console-integration.jar jbpm-console-reports.jar jbpm-db.jar jbpm-examples-tests.jar jbpm-jboss.jar jbpm-test-db-tests.jar jta.jar junit.jar livetribe-jsr223.jar log4j.jar mail.rar mysql-connector-java.jar org.springframework.aop-3.0.4.RELEASE.jar org.springframework.asm-3.0.4.RELEASE.jar org.springframework.aspects-3.0.4.RELEASE.jar org.springframework.beans-3.0.4.RELEASE.jar org.springframework.context.support-3.0.4.RELEASE.jar org.springframework.context-3.0.4.RELEASE.jar org.springframework.core-3.0.4.RELEASE.jar org.springframework.expression-3.0.4.RELEASE.jar org.springframework.instrument-3.0.4.RELEASE.jar org.springframework.jdbc-3.0.4.RELEASE.jar org.springframework.jms-3.0.4.RELEASE.jar org.springframework.orm-3.0.4.RELEASE.jar org.springframework.oxm-3.0.4.RELEASE.jar org.springframework.test-3.0.4.RELEASE.jar org.springframework.transaction-3.0.4.RELEASE.jar org.springframework.web.portlet-3.0.4.RELEASE.jar org.springframework.web.servlet-3.0.4.RELEASE.jar org.springframework.web.struts-3.0.4.RELEASE.jar org.springframework.web-3.0.4.RELEASE.jarxznsoft的博客: xznsoftxznsoft 2010-09-21jboss不熟，我看了下jboss一样包含el-api.jar，你在项目的lib中删除juel-api.jar库juel-impl.jar和juel-engine.jar保留应该就没有问题了青雉的博客: 青雉青雉 2010-09-23我也遇到同样问题。你解决了吗？xyz20003的博客: 镜花水月xyz20003 2010-09-23tomcat5下，juel-api.jar,juel-impl.jar,(juel-engine.jar)三个包全加tomcat6下，只加juel-impl.jar和juel-engine.jar青雉的博客: 青雉青雉 2010-09-23好了。 我是把juel-api.jar,juel-impl.jar,juel-engine.jar替换了。tomcat6下的el-api.jar 不过这样需要实施的时候特殊说明了。luweisouma的博客: luweisouma 2010-10-29我使用的是tomcat6，jdk1.6，将lib下的juel-api.jar删除即可。我看juel-api.jar和tomcat下的el-api.jar的内容是一样的，因为有冲突所以报错。imp860124的博客: 懒到变成虫imp860124 2011-01-24我用的也是Tomcat6和jdk1.6,报这个错后按网上的说法把jbpm4.4 lib下面的juel-api.jar,juel-impl.jar,juel-engine.jar都拷进工程，还是报错，在这里找到解决方案啊。