java.io.IOException: Server returned HTTP response code: 500 for URL

网上很多人提到war包部署出现如下错误问题：

 

java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:8080/catering/cater_chain

     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

     at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1360)

     at java.security.AccessController.doPrivileged(Native Method)

     at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1354)

     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1008)

     at com.test.TestJson.sendRequest(TestJson.java:177)

     at com.test.TestJson.main(TestJson.java:148)

Caused by: java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:8080/catering/cater_chain

     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1305)

     at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:373)

     at com.test.TestJson.sendRequest(TestJson.java:176)

     ... 1 more

在我项目中也遇到同样的问题。(服务端与客户端以接口数据流的形式交互(json))

 

部署描述	异常情况
1.通过MyEclipse部署到jetty-6.1.14	接口访问正常	IE访问正常
2.通过war部署到jetty-6.1.14	接口访问正常	IE访问正常
3.通过MyEclipse部署到apache-tomcat-7.0.34	接口访问正常	IE访问正常
4.通过war部署到apache-tomcat-7.0.34	接口访问异常	IE访问正常
解决方法： 1.       服务端使用response.getWriter().print("message");可解决。 我之前使用的模式是： client(send json[IO])--> (get json[IO])server(send json[request])--> (get json[request])view(send view_json[IO])--> client 2.       在tomcat的F:\Program Files\apache-tomcat-7.0.34\lib目录下添加一个jar包：javax.servlet.jsp.jstl.jar可解决。