创建Apache Tiles简单应用程序时出现异常

Question

我正在尝试创建我的第一个Tiles网页。 我使用this tutorial和所有CONFIGS完成后，我得到这个异常：

java.lang.NullPointerException 
    at org.apache.tiles.access.TilesAccess.getContainer(TilesAccess.java:124) 
    at org.apache.tiles.access.TilesAccess.getContainer(TilesAccess.java:107) 
    at org.apache.tiles.access.TilesAccess.getCurrentContainer(TilesAccess.java:174) 
    at org.apache.tiles.template.InsertDefinitionModel.execute(InsertDefinitionModel.java:95) 
    at org.apache.tiles.jsp.taglib.InsertDefinitionTag.doTag(InsertDefinitionTag.java:254) 
    at org.apache.jsp.menu.menu_jsp._jspx_meth_tiles_005finsertDefinition_005f0(menu_jsp.java:92) 
    at org.apache.jsp.menu.menu_jsp._jspService(menu_jsp.java:65) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

我创建了瓷砖，defs.xml并添加所有的configs到我的web.xml。

Answer 1

我走相同的教程，发现缺少配置。这种加入web.xml：

<listener> 
    <listener-class>org.apache.tiles.web.startup.simple.SimpleTilesListener</listener-class> 
</listener> 

此侦听器将跟踪应用程序启动和将配置与默认方式瓷砖（瓷砖主要配置应该是只在这里：/WEB-INF/tiles.xml）就这是在默认配置硬编码。