https://issues.apache.org/bugzilla/show_bug.cgi?id=47451
Summary: NPE if response contains null content-encoding header
Product: Tomcat 6
Version: 6.0.20
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Connectors
AssignedTo: dev@tomcat.apache.org
ReportedBy: dan.r...@oracle.com
I've been getting a NullPointerException when using the JnlpDownloadServlet
from JDK 1.6.0_14 with Tomcat 6.0.20:
Jun 29, 2009 3:35:03 PM org.apache.coyote.http11.Http11Processor process
SEVERE: Error finishing response
java.lang.NullPointerException
at org.apache.tomcat.util.buf.MessageBytes.indexOf(MessageBytes.java:479)
at org.apache.tomcat.util.buf.MessageBytes.indexOf(MessageBytes.java:485)
at
org.apache.coyote.http11.Http11Processor.isCompressable(Http11Processor.java:1441)
at
org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1517)
at
org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:944)
at org.apache.coyote.Response.action(Response.java:181)
at
org.apache.coyote.http11.InternalOutputBuffer.endRequest(InternalOutputBuffer.java:379)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:889)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:619)
A brief analysis of the JnlpDownloadServlet code shows that the
content-encoding
header on the response is being set to null in
DownloadResponse$FileDownloadResponse.
The Tomcat code tries to guard against a null header in
Http11Process.isCompressable:
if ((contentEncodingMB != null)
&& (contentEncodingMB.indexOf("gzip") != -1))
return false;
However, it appears that it's possible for contentEncodingMB, which is an
instance of MessageBytes, to be non-null, while the value encapsulated by
the MessageBytes IS null, resulting in an NPE in MessageBytes.indexOf().
Since this occurs with the JnlpDownloadServlet provided by Sun (see
http://java.sun.com/j2se/1.5.0/docs/guide/javaws/developersguide/downloadservletguide.html),
I imagine more people might be running into this problem.
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