[jboss-jira] [JBoss JIRA] (JBWEB-149) Occassional NullPointerException when using the AJP Connector

Occassional NullPointerException when using the AJP Connector -------------------------------------------------------------- Key: JBWEB-149 URL: https://issues.jboss.org/browse/JBWEB-149 Project: JBoss Web Issue Type: Bug Security Level: Public(Everyone can see) Components: Core Reporter: Samuel Mendenhall Assignee: Remy Maucherat ERROR 2009-04-30 10:54:14,547 [ajp-xxxxxxxxxxxxxxxx%2F10.230.10.131-22803-2][][] org.apache.coyote.ajp.AjpMessage 'Cannot append null value' java.lang.NullPointerException at org.apache.coyote.ajp.AjpMessage.appendString(AjpMessage.java:242) at org.apache.coyote.ajp.AjpMessage.appendBytes(AjpMessage.java:178) at org.apache.coyote.ajp.AjpProcessor.prepareResponse(AjpProcessor.java:961) at org.apache.coyote.ajp.AjpProcessor.action(AjpProcessor.java:495) at org.apache.coyote.Response.action(Response.java:183) at org.apache.coyote.Response.sendHeaders(Response.java:379) at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:305) at org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:273) at org.apache.catalina.connector.Response.finishResponse(Response.java:486) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:257) at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:437) at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:381) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) The fix Jean-Frederic highlighted being: src/share/classes/org/apache/coyote/ajp/AjpProcessor.java responseHeaderMessage.appendInt(numHeaders); for (int i = 0; i < numHeaders; i++) { MessageBytes hN = headers.getName(i); + if (hN == null || hN.toString() == null) + continue; int hC = Constants.getResponseAjpIndex(hN.toString()); if (hC > 0) { responseHeaderMessage.appendInt(hC); +++ Which, after using a patched jar, the customer has not seen the NPE since.