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https://issues.apache.org/jira/browse/MYFACES-3695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13581391#comment-13581391
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Jack van Ooststroom commented on MYFACES-3695:
----------------------------------------------
Might be worth mentioning here as well that I opened a similar ticket for
Mojarra: http://java.net/jira/browse/JAVASERVERFACES-2739
> 'Cannot set header. Response already committed.' on WebSphere Application
> Server 7 and 8
> ----------------------------------------------------------------------------------------
>
> Key: MYFACES-3695
> URL: https://issues.apache.org/jira/browse/MYFACES-3695
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-314
> Affects Versions: 2.1.10
> Environment: WebSphere Application Server 7 or 8
> Reporter: Jack van Ooststroom
>
> When trying to handle a resource using the default implementation of
> ResourceHandler, namely ResourceHandlerImpl, a warning message is logged when
> running on WebSphere Application Server 7 or 8:
> W com.ibm.ws.webcontainer.srt.SRTServletResponse setIntHeader SRVE8094W:
> WARNING: Cannot set header. Response already committed.
> Looking at the code of ResourceHandlerImpl.handleResourceRequest(FacesContext
> context) I found the following snippet:
> try
> {
> InputStream in = resource.getInputStream();
> OutputStream out = httpServletResponse.getOutputStream();
> //byte[] buffer = new byte[_BUFFER_SIZE];
> byte[] buffer = new byte[this.getResourceBufferSize()];
>
> try
> {
> int count = pipeBytes(in, out, buffer);
> //set the content lenght
> httpServletResponse.setContentLength(count);
> }
> finally
> {
> try
> {
> in.close();
> }
> finally
> {
> out.close();
> }
> }
> }
> If the resource is small enough and the buffer limit is not reached
> everything should be fine (default size seems 2048), however if the resource
> is bigger the buffer gets flushed WebSphere Application Server will use
> chunked encoding and the httpServletResponse.setContentLength(count) gets
> executed after the fact resulting in the mentioned message. Setting the
> org.apache.myfaces.RESOURCE_BUFFER_SIZE context parameter is a possible
> workaround, but it would be better to avoid this as resource sizes can be
> unpredictable.
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