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From "Archit Shah (JIRA)" <axis-...@ws.apache.org>
Subject [jira] Created: (AXIS-2142) ClassCastException in JavaUtils.convert
Date Tue, 26 Jul 2005 17:26:20 GMT
ClassCastException in JavaUtils.convert
---------------------------------------

         Key: AXIS-2142
         URL: http://issues.apache.org/jira/browse/AXIS-2142
     Project: Apache Axis
        Type: Bug
    Versions: current (nightly)    
 Environment: Axis 1.2 CVS using GNU classpathx javamail and activation implementations with
Sun JDK 1.4.2_06
    Reporter: Archit Shah
 Attachments: DH.patch

When running the Axis (not Axis2) CVS tip with javamail and activation implementations from
GNU classpathx, two tests fail with ClassCastExceptions. These failures are due to incorrect
use of DataHandlers. The failing tests are:

test.wsdl.interop4.groupG.dime.rpc.DimeRPCInteropTestCase
#test2DimeRPCSoapPortEchoAttachments

test.wsdl.interop4.groupG.mime.rpc.MimeRPCInteropTestCase
#test2MimeRPCSoapPortEchoAttachments

And the stack trace is:

java.lang.ClassCastException
    at org.apache.axis.utils.JavaUtils.convert(JavaUtils.java:325)
    at org.apache.axis.utils.JavaUtils.convert(JavaUtils.java:472)
    at org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:118)
    at org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323)
    at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
    at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
    at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
    at org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:453)
    at org.apache.axis.server.AxisServer.invoke(AxisServer.java:281)
    at org.apache.axis.transport.http.SimpleAxisWorker.execute(SimpleAxisWorker.java:428)
    at org.apache.axis.transport.http.SimpleAxisWorker.run(SimpleAxisWorker.java:155)
    at org.apache.axis.transport.http.SimpleAxisServer.run(SimpleAxisServer.java:245)
    at org.apache.axis.transport.http.SimpleAxisServer.start(SimpleAxisServer.java:296)
    at org.apache.axis.transport.http.SimpleAxisServer.start(SimpleAxisServer.java:304)
    at org.apache.axis.transport.http.SimpleAxisServer.main(SimpleAxisServer.java:385)

The convert method of org.apache.axis.utils.JavaUtils relies on the getContent method of javax.activation.DataHandler
to get an InputStream for the data, twice doing the following:

  in = (InputStream)handler.getContent();

instead of:

  in = handler.getInputStream();

Calling getContent and casting to InputStream is not guaranteed to work. The Javadoc for the
getContent method specifies "If no DataContentHandler can be found for the the type of this
data, the DataHandler returns an InputStream for the data." Therefore, the cast can fail if
a DataContentHandler is installed.  I ran into this exceptions because the GNU javamail implementation
has a DataContentHandler for the MIME type application/octet-stream and getContent returns
a byte array instead of the input stream.

Casting the return value of getContent is also done in another context. JavaUtils and SourceDataHandlerDeserializer
both do:

  StreamSource ss = new StreamSource(new StringReader(
    (String) dh.getContent()));

when the following would suffice:

  StreamSource ss = new StreamSource(dh.getInputStream());


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