DO NOT REPLY [Bug 37381] New: - pageContext.forward causes Illegal to clear() when buffer size == 0

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http://issues.apache.org/bugzilla/show_bug.cgi?id=37381

           Summary: pageContext.forward causes Illegal to clear() when
                    buffer size == 0
           Product: Tomcat 5
           Version: 5.0.28
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Jasper
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: carl@zero-one.co.za


I have certain JSP pages where no buffer is required - or rather a buffer of 0
IS required - being set via: <%@ page buffer="none" %>.  On this implementation
a security check is performed (session based) and if it fails, I do a
pageContext.forward("/somepath/jsp").  Works file, except on the pages where <%@
page buffer="none" %> is specified.  

Exception details:

Illegal to clear() when buffer size == 0
java.lang.IllegalStateException
at org.apache.jasper.runtime.JspWriterImpl.clear(JspWriterImpl.java:144)
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:646)
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:637)
    at com.unysen.security.SecurityCheckTag.doStartTag(SecurityCheckTag.java:179)

Would it not be safe to do a:

if (pageContext.getOut().getBufferSize() > 0)
  JspWriterImpl.clear();

Not sure if this is required by the JSP spec or not, but seems like a logical
check to make :)

Thanks.

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