[richfaces-issues] [JBoss JIRA] Assigned: (RF-8079) File Upload Control intermittently fails

[Nick Belaevski (JIRA)]

     [ https://jira.jboss.org/jira/browse/RF-8079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nick Belaevski reassigned RF-8079:
----------------------------------

    Assignee: Nick Belaevski


> File Upload Control intermittently fails
> ----------------------------------------
>
>                 Key: RF-8079
>                 URL: https://jira.jboss.org/jira/browse/RF-8079
>             Project: RichFaces
>          Issue Type: Bug
>          Components: component-input
>    Affects Versions: 3.3.2.SR1
>         Environment: linux, tomcat 6, myfaces 1.2.6, richfaces 3.3.2 SR1, mysql 5.0
>            Reporter: James Goodfellow
>            Assignee: Nick Belaevski
>
> We started using the richfaces file upload control in our web server (tomcat/myfaces/richfaces).  Once deployed we had complaints from our users (especially those with slow connections) that the file upload didn't complete.  I found it difficult to reproduce when running the webserver locally but it did happen occasionally.  After debugging I determined that the upload failed to complete because the "fileUploadListener" handler was not being called some of the time.  Further, I found that in the cases where the "fileUploadListener" wasn't called, the MultipartRequest indicated that it did not have the "javax.faces.ViewState" request parameter.  I verified from the client that the "javax.faces.ViewState" parameter was in the multipart content so this lead me to believe that the problem was in the parsing of that content.  I have determined that the problem is in the way the parsing uses the read buffer.  If the input stream returns content that ends on a parameter boundary, that parameter can get missed.  It is also the case that bytes are being checked in the read buffer beyond the end index which can lead to unknown results.  It would be very difficult to give a test case because the problem is intermittent.  The problems I found are in org.ajax4jsf.request.MultipartRequest.  Here is an example:
> 	private Param readHeader() throws IOException {
> ...
> 			for (int i = this.pos; i < localRead; i++) {
> ...
> 					if (checkSequence(buffer, i + CR_LF.length,
> 							CR_LF)) {
> In this case "i" can be up to "localRead - 1" where the checkSequence method accesses "localRead + 1" and "localRead + 2" positions of the read buffer which are beyond the boundary of localRead.

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