運行異常，同時增加了一個ArrayList

我dveloping基於RESTful應用程序球衣：
所以每當我添加的東西到我的ArrayList中的tomcat拋出這個錯誤：運行異常，同時增加了一個ArrayList

的RuntimeException的不能被映射到一個響應，重新拋向HTTP容器
這是什麼意思？

diagonosing這個問題時，我發現它發生在：

mylist.add(item1);

爲什麼我不能添加到數組列表？

我的堆棧跟蹤：

<DateHere> : com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException 
SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container 
java.lang.NullPointerException 
    at com.proj.datastorage.myclass1.<init>(myclass1.java:19) 
    at com.proj.datastorage.myclass2.<init>(myclass2.java:30) 
    at com.proj.front.CreateResource.newShop(CreateResource.java:109) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) 
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$VoidOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:167) 
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) 
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) 
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) 
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) 
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) 
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381) 
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716) 
    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:128) 
    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:293) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454) 
    at java.lang.Thread.run(Unknown Source)

來源

2013-06-18 user2416728

請發佈完整的堆棧跟蹤 – fmodos

什麼是隊友..我的意思是我給了問題的原因..我得到的錯誤..現在什麼？ – user2416728

你正在得到的錯誤應該有更多的信息...這是什麼堆棧跟蹤是：http://stackoverflow.com/questions/3988788/what-is-a-stack-trace-and-how-can-i-使用它來調試我的應用程序錯誤 – fmodos

的mylist可能null，創建一個默認實例：ArrayList<String> mylist = new ArrayList<String>()。

來源

2013-06-18 07:05:12 fmodos

http：// stackoverflow .com/questions/17165315 /如何進行身份驗證和重定向 - 用戶對他自己的網頁在澤西休息服務另一個給你！ ;） @fmodos – user2416728

運行異常，同時增加了一個ArrayList

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