IllegalArgumentException加載Servlet中偵聽器的屬性3.1應用程序

Question

我有一個ServletContextListener當它試圖從文件加載屬性時，它給了我一個IllegalArgumentException。我的代碼如下：

private final static Properties properties = new Properties(); 

@Override 
public void contextInitialized(ServletContextEvent sce) {   
    ServletContext sc = sce.getServletContext(); 

    try {       
     // Load MyProject's properties file. 
     properties.load(sc.getResourceAsStream(sc.getInitParameter("myProjectPropsFilePath")));           
    } 
    catch(IOException e) {          
     Utils.printStackTrace(e); 
    } 

    // Write properties to ServletContext. 
    sc.setAttribute("properties", properties); 
} 

上下文參數將被web.xml檢索但我不明白爲什麼IllegalArgumentException在行被拋出：

properties.load(sc.getResourceAsStream(sc.getInitParameter("myProjectPropsFilePath")));

堆棧跟蹤如下：

08-Jun-2015 12:52:07.439 SEVERE [http-apr-8080-exec-34] org.apache.catalina.core.StandardContext.listenerStart Exception sending context initialized event to listener instance of class myProject.listener.SetPropertiesServletContextListener java.lang.IllegalArgumentException: The resource path [\WEB-INF\properties\MyProject.properties] is not valid at org.apache.catalina.webresources.StandardRoot.validate(StandardRoot.java:237) at org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:199) at org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:193) at org.apache.catalina.core.ApplicationContext.getResourceAsStream(ApplicationContext.java:559) at org.apache.catalina.core.ApplicationContextFacade.getResourceAsStream(ApplicationContextFacade.java:209) at myProject.listener.SetPropertiesServletContextListener.contextInitialized(SetPropertiesServletContextListener.java:26) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4738) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5158) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:697) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:579) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:455) at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1554) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1428) at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:885) at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:343) at javax.servlet.http.HttpServlet.service(HttpServlet.java:618) at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:615) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2451) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2440) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:744)

任何想法？我正在使用Apache Tomcat 8.0.3。

的web.xml的適當部分是：

<!-- Listeners and parameters. --> 
<listener> 
    <description>SetPropertiesServletContextListener</description> 
    <listener-class>myProject.listener.SetPropertiesServletContextListener</listener-class> 
</listener> 
<context-param> 
    <param-name>myProjectPropsFilePath</param-name> 
    <param-value>\WEB-INF\properties\myProject.properties</param-value> 
</context-param> 

Answer 1

路徑應包含/作爲隔板，因爲/ WEB-INF /保留在窗口和在Linux是相同的。你可能在web.xml中有錯誤的值。根據Java API specs，你總是使用/。 這是錯誤的：<param-value>\WEB-INF\properties\myProject.properties</param-value> 不該得到： <param-value>/WEB-INF/properties/myProject.properties</param-value>