Eclipse 动态 Web 项目无法在 WTP 下加载

Question

当尝试使用 WTP 在 Tomcat 设置下运行 Eclipse 动态 Web 项目时，它失败并显示附加的堆栈跟踪。

清单

• 在项目属性中的“Java EE 模块依赖项”下，我检查了
• wtp 部署目录中 lib 下的“Maven 依赖项”，确实存在所有依赖项（特别是 struts-taglib-1.3.10.jar

）另一方面，如果我用 maven 打包并将 war 文件复制到 webapps 目录下，一切都会正常工作。

规范

Eclipse Java EE Galileo SR2（带 WTP 3.1.1）

Tomcat 6.0.26

Java(TM) SE 运行时环境（内部版本 1.6.0_17-b04-248-10M3025） Java HotSpot(TM) 64 位服务器 VM（内部版本 14.3-b01-101，混合模式）

stacktrace

org.apache.jasper.JasperException: Unable to read TLD "META-INF/tld/struts-html-el.tld" from JAR file "file:/Users/cue/Development/workspace/eclipse/.metadata/.plugins/org.eclipse.wst.server.core/tmp2/wtpwebapps/ticketing/WEB-INF/lib/struts-el-1.3.10.jar": org.apache.jasper.JasperException: Failed to load or instantiate TagExtraInfo class: org.apache.struts.taglib.html.MessagesTei
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:51)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:181)
at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:182)
at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:383)
at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:446)
at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1393)
at org.apache.jasper.compiler.Parser.parse(Parser.java:130)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:185)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:347)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:589)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:637)

Answer 1

Eclipse 确实会移动所有“Maven 依赖项”，因此 *servlet-api-2.5.jar 也存在于导致问题的 webapp lib 下。