getOutputStream() has already been called..

[2005 IR Help]

By: bigInsect - biginsect

getOutputStream() has already been called..

2004-05-26 02:22

I used the jasperreport 0.5.2,but have a problem:

I used windows platform and Tomcat container

When print the HTML,console message:

2004-05-26 15:15:08 StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception

java.lang.IllegalStateException: getOutputStream() has already been called for this response

at org.apache.catalina.connector.ResponseBase.....

 

 

 

 

By: Chuck Deal - cdeal

RE: getOutputStream() has already been called..

2004-05-26 05:33

This has been covered a while ago, so if I don't give you enough detail, search the forum again.

 

The problem is that on a JSP you can NOT use both the "out" object as well as call "getOutputStream()" you can only use one or the other. You can look at the genereated .java for the JSP to find references to either of those methods.

 

 

 

 

By: bigInsect - biginsect

RE: getOutputStream() has already been called..

2004-05-26 18:03

But why in your jasper's example,have the same error message?

 

+jasperreports

-demo

-samples

-webapp

Why?

 

 

 

 

 

By: Salman Khattak - khattaksd

RE: getOutputStream() has already been called..

2004-06-01 07:57

The jsp example in the webapp is throwing that exception. As mentioned by Chuck, JSP is not the right choice for streaming byte data. However, for some obscure reason you still want to do that, then you will have to live with that exception.

 

You will note that the servlet example is not throwing any exception.

 

To reiterate, when you want to stream byte data, use SERVLETS!

 

There is more detailed discussion on this issue all over the web, if you want to know the 'why' part of this.