Maven搭建的SSM项目中遇到的问题

Maven搭建的SSM项目中遇到的问题

1. EL表达式失效

2. 装配异常Unable to configure ssm

解决办法

1. 其实这两个问题的出现都是因为servlet版本和java版本不合适造成的，EL表达式在servlet2.5之后才支持而Maven项目默认的 web.xml 版本为2.3，jre 版本为1.5。

2. servlet、jsp、EL、Tomcat、Java版本对应关系

   Servlet Spec	JSP Spec	EL Spec	Apache Tomcat version	Supported Java Versions
   3.1	2.3	3.0	8.5.x	7 and later
   3.1	2.3	3.0	8.0.x	7 and later
   3.0	2.2	2.2	7.0.x	6 and later
   2.5	2.1	2.1	6.0.x	5 and later
   2.4	2.0	不支持	5.5.x	1.4 and later

   web.xml v2.5

   <?xml version="1.0" encoding="UTF-8"?>  
   <web-app xmlns="http://java.sun.com/xml/ns/javaee"  
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
             xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  
             http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
             version="2.5">  
   

3. java版本问题导致的异常

   • 异常具体信息如下：

     org.eclipse.m2e.wtp.MarkedException: Unable to configure ssm
         at org.eclipse.m2e.wtp.AbstractProjectConfiguratorDelegate.configureProject(AbstractProjectConfiguratorDelegate.java:98)
         at org.eclipse.m2e.wtp.WTPProjectConfigurator.configure(WTPProjectConfigurator.java:68)
         at org.eclipse.m2e.core.project.configurator.AbstractLifecycleMapping.configure(AbstractLifecycleMapping.java:120)
         at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$3.call(ProjectConfigurationManager.java:501)
         at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$3.call(ProjectConfigurationManager.java:1)
         at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
         at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
         at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:494)
         at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration0(ProjectConfigurationManager.java:432)
         at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$2.call(ProjectConfigurationManager.java:345)
         at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$2.call(ProjectConfigurationManager.java:1)
         at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
         at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
         at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
         at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1351)
         at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:342)
         at org.eclipse.m2e.core.ui.internal.UpdateMavenProjectJob.runInWorkspace(UpdateMavenProjectJob.java:77)
         at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:39)
         at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
     Caused by: org.eclipse.core.runtime.CoreException: One or more constraints have not been satisfied.
         at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modifyInternal(FacetedProject.java:363)
         at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChangesInternal(FacetedProject.java:1181)
         at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.access$2(FacetedProject.java:1117)
         at org.eclipse.wst.common.project.facet.core.internal.FacetedProject$1.run(FacetedProject.java:324)
         at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2240)
         at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2267)
         at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modify(FacetedProject.java:339)
         at org.eclipse.m2e.wtp.WebProjectConfiguratorDelegate.configure(WebProjectConfiguratorDelegate.java:136)
         at org.eclipse.m2e.wtp.AbstractProjectConfiguratorDelegate.configureProject(AbstractProjectConfiguratorDelegate.java:94)
         ... 18 more
     

   • 解决办法

     • 升级maven项目默认的web.xml 版本2.3，jre 版本1.5。
     • 具体方法参见http://blog.csdn.net/peng_hong_fu/article/details/53584104#comments