getting error -HttpURLConnection

[vinoth sathiya]

Dear Friends,

I'm testing my application in HttpURLConnection httpcon.

I have written some code for http connection.

when i get httpcon.getInputStream(); means it showing

" Internal Server Error" throwing 500.
but when i run in eclipse workspace means its working. but in EAR means it showing this exception.


Any one help?


thanks in advance.

[Tim Moores]

I don't think there's anything we could say without seeing the complete stack trace, and the section of code that causes it.

[Rob Spoor]

You'll need to trouble shoot why the server is causing this error. Catch the IOException, and in the catch block call getErrorStream() to read from this instead. This may give you the reason.

InputStream is = null;
try
{
    is = connection.getInputStream();
}
catch (IOException e)
{
    is = connection.getErrorStream(); // may return null, hence the check further on
}
if (is != null)
{
    // handle
}

[vinoth sathiya]

Rob Spoor wrote:You'll need to trouble shoot why the server is causing this error. Catch the IOException, and in the catch block call getErrorStream() to read from this instead. This may give you the reason.

InputStream is = null;
try
{
    is = connection.getInputStream();
}
catch (IOException e)
{
    is = connection.getErrorStream(); // may return null, hence the check further on
}
if (is != null)
{
    // handle
}

Thanks for response.


I have written catch block:

getErrorStream(): sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@28f2f1

getResponseMessage(): Internal Server Error

getResponseCode: 500

any solution?

[Tim Moores]

Tim Moores wrote:I don't think there's anything we could say without seeing the complete stack trace

[vinoth sathiya]

StackTrace is:
java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:28080/prod/CM.racst.mlrp
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
2012-01 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1227)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1221)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:910)
at prod.RPTaction.mulrptcallingval.generateReports(mulrptcallingval.java:1281)
at prod.RPTaction.mulrptcallingval.valmulrptcall(mulrptcallingval.java:721)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at prodweb.utility.XMLDTHttpServlet.getInfo(XMLDTHttpServlet.java:425)
at prodweb.utility.XMLDTHttpServlet.doGet(XMLDTHttpServlet.java:166)
at prodweb.utility.XMLDTHttpServlet.doPost(XMLDTHttpServlet.java:273)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:28080/prod/CM.racst.mlrp
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1174)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:1899)
at java.net.HttpURLConnection.getHeaderFieldDate(HttpURLConnection.java:438)
at java.net.URLConnection.getExpiration(URLConnection.java:502)
at prod.RPTaction.mulrptcallingval.generateReports(mulrptcallingval.java:1272)
... 29 more

[Tim Moores]

That looks like client-side stack trace - there should be a server-side stack trace that points to the problem. If the server is not under your control, contact the server admin.

[vinoth sathiya]

Hi, Server side stack trace is:


2012-01-23 15:14:04,754 INFO [STDOUT] java.lang.NullPointerException
2012-01-23 15:14:04,754 INFO [STDOUT] at CM.racst.getReportParameters(racst.java:132)
2012-01-23 15:14:04,754 INFO [STDOUT] at Framework.MailReportServlet.doGet(MailReportServlet.java:175)
2012-01-23 15:14:04,754 INFO [STDOUT] at Framework.MailReportServlet.doPost(MailReportServlet.java:914)
2012-01-23 15:14:04,754 INFO [STDOUT] at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
2012-01-23 15:14:04,754 INFO [STDOUT] at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
2012-01-23 15:14:04,754 INFO [STDOUT] at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
2012-01-23 15:14:04,754 INFO [STDOUT] at java.lang.Thread.run(Thread.java:595)


2012-01-23 15:14:04,754 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/Panacea].[MailReportServlet]] Servlet.service() for servlet MailReportServlet threw exception
java.lang.NullPointerException
at Framework.MailReportServlet.doGet(MailReportServlet.java:805)
at Framework.MailReportServlet.doPost(MailReportServlet.java:914)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)




Thanks,

[Tim Moores]

So you need to investigate which object is null, and why that is.

[Rob Spoor]

vinoth sathiya wrote:

Rob Spoor wrote:You'll need to trouble shoot why the server is causing this error. Catch the IOException, and in the catch block call getErrorStream() to read from this instead. This may give you the reason.

InputStream is = null;
try
{
    is = connection.getInputStream();
}
catch (IOException e)
{
    is = connection.getErrorStream(); // may return null, hence the check further on
}
if (is != null)
{
    // handle
}

Thanks for response.


I have written catch block:

getErrorStream(): sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@28f2f1

getResponseMessage(): Internal Server Error

getResponseCode: 500

any solution?

Instead of printing the result of getErrorStream() you should read the contents from that InputStream. That would have given the error message the server is sending back to the client. In this case it's probably similar to the error found in the server logs, but you can use this technique if you don't have access to the server.