Class cast exception due to overloaded use of a constant
--------------------------------------------------------
Key: AXIS2-2147
URL: https://issues.apache.org/jira/browse/AXIS2-2147
Project: Axis 2.0 (Axis2)
Issue Type: Bug
Components: kernel
Reporter: Matt Lovett
When using Sandesha, messages may be retransmitted. When running the unit tests
that exercise this, we are getting a
class cast exception the second time that we send a message. Here's the java
stack trace:
10943 [Axis2 Task] ERROR org.apache.sandesha2.workers.SenderWorker - Sandesha2
got an exception when sending a message: java.lang.ClassCastException:
org.apache.commons.httpclient.methods.PostMethod incompatible with
java.lang.String.
java.lang.ClassCastException: org.apache.commons.httpclient.methods.PostMethod
incompatible with java.lang.String
at
org.apache.axis2.transport.http.SOAPOverHTTPSender.send(SOAPOverHTTPSender.java:48)
at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:349)
at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:208)
at org.apache.axis2.engine.AxisEngine.resumeSend(AxisEngine.java:383)
at org.apache.sandesha2.workers.SenderWorker.run(SenderWorker.java:228)
at
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:788)
The code that is executing is the cast to String of 'httpMethod'
public void send(MessageContext msgContext, OMElement dataout, URL url,
String soapActionString)
throws MalformedURLException, AxisFault, IOException {
// execute the HtttpMethodBase - a connection manager can be given for
// handle multiple
String httpMethod =
(String)
msgContext.getProperty(Constants.Configuration.HTTP_METHOD);
if ((httpMethod != null)
&&
Constants.Configuration.HTTP_METHOD_GET.equalsIgnoreCase(httpMethod)) {
this.sendViaGet(msgContext, url, soapActionString);
return;
}
this.sendViaPost(msgContext, dataout, url, soapActionString);
}
I think the root cause is probably due to two contstants having the same value,
and both being used as keys into the MessageContext properties:
org.apache.axis2.transport.http.HTTPConstants.HTTP_METHOD = "HTTP_METHOD"
and
org.apache.axis2.Constants.Configuration.HTTP_METHOD = "HTTP_METHOD"
I think that the HTTPConstants one is written part way through the first send,
making a side-effect that poisons the second send. This is when using Sandesha
without calling the MessageContext serialization code, persumably if we were
using that we would avoid the issue.
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