problem with DSC in ClassAliasRegistry

[winko]

The code and comments in file AmfXmlConverter.java beginning with row 145 says:

// Class aliases for deserialization, mimics registerClassAlias in Flex
//   Generally only used in rendering as it can cause serious problems for proxy sampling
if (useAliasRegistry) {
    ClassAliasRegistry aliases = ClassAliasRegistry.getRegistry();
    aliases.registerAlias("DSC", "flex.messaging.messages.CommandMessageExt"); // This causes errors in XStream during proxy sampling (cannot cast byte to string)
    aliases.registerAlias("DSK", "flex.messaging.messages.AcknowledgeMessageExt");
}

When useAliasRegistry is false I got:

• ERROR - jmeter.protocol.amf.util.AmfXmlConverter: An exception was encountered while deserializing response. flex.messaging.MessageException: Cannot create class of type 'DSC'. Type 'DSC' not found.

When useAliasRegistry is true I got:

• com.thoughtworks.xstream.converters.ConversionException: java.lang.Byte cannot be cast to java.lang.String : java.lang.Byte cannot be cast to java.lang.String

Does anybody an idea how to solve this problem?

[noogrub]

Have a look here:
http://stackoverflow.com/questions/8654141/convert-byte-to-string-in-java

Sounds like maybe you need to add an encoding to get it to work?

On Wed, Mar 13, 2013 at 10:21 AM, winko notifications@github.com wrote:

The code and comments in file AmfXmlConverter.java beginning with row 145
says:

// Class aliases for deserialization, mimics registerClassAlias in Flex
// Generally only used in rendering as it can cause serious problems for proxy sampling
if (useAliasRegistry) {
ClassAliasRegistry aliases = ClassAliasRegistry.getRegistry();
aliases.registerAlias("DSC", "flex.messaging.messages.CommandMessageExt"); // This causes errors in XStream during proxy sampling (cannot cast byte to string)
aliases.registerAlias("DSK", "flex.messaging.messages.AcknowledgeMessageExt");
}

When useAliasRegistry is false I got:

• ERROR - jmeter.protocol.amf.util.AmfXmlConverter: An exception was
  encountered while deserializing response. flex.messaging.MessageException:
  Cannot create class of type 'DSC'. Type 'DSC' not found.

When useAliasRegistry is true I got:

• com.thoughtworks.xstream.converters.ConversionException:
  java.lang.Byte cannot be cast to java.lang.String : java.lang.Byte cannot
  be cast to java.lang.String

Does anybody an idea how to solve this problem?

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/32
.

John Burgoon
Software engineer/application developer
Herff Jones, Inc.
-- "Time flies, but as I get older it seems like the landings are
getting a little rough."

[winko]

That's an idea... I will look for this...

For information I will attach all the debugging information below.

I'm wondering if it is possible (and reasonable) to force an encoding by the fromXML method of XStream... ?

com.thoughtworks.xstream.converters.ConversionException: java.lang.Byte cannot be cast to java.lang.String : java.lang.Byte cannot be cast to java.lang.String
---- Debugging information ----
message : java.lang.Byte cannot be cast to java.lang.String
cause-exception : java.lang.ClassCastException
cause-message : java.lang.Byte cannot be cast to java.lang.String
class : flex.messaging.messages.CommandMessageExt
required-type : flex.messaging.messages.CommandMessageExt
converter-type : com.thoughtworks.xstream.converters.reflection.ExternalizableConverter
path : /ActionMessage/bodies/MessageBody/data/DSC
line number : 11
class[1] : [Ljava.lang.Object;
converter-type[1] : com.thoughtworks.xstream.converters.collections.ArrayConverter
class[2] : flex.messaging.io.amf.MessageBody
converter-type[2] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
class[3] : java.util.ArrayList
converter-type[3] : com.thoughtworks.xstream.converters.collections.CollectionConverter
class[4] : flex.messaging.io.amf.ActionMessage
version : null

---

at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:71)
at com.thoughtworks.xstream.converters.collections.ArrayConverter.unmarshal(ArrayConverter.java:55)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:355)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:306)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:71)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.addCurrentElementToCollection(CollectionConverter.java:79)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:72)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:66)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.unmarshal(CollectionConverter.java:61)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:355)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:306)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1052)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1036)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:912)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:903)
at org.apache.jmeter.protocol.amf.util.AmfXmlConverter.convertXmlToAmfMessage(AmfXmlConverter.java:119)
at org.apache.jmeter.protocol.amf.sampler.AmfRequest.sample(AmfRequest.java:158)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1088)
at org.apache.jmeter.protocol.amf.proxy.AmfProxy.run(AmfProxy.java:255)
Caused by: java.lang.ClassCastException: java.lang.Byte cannot be cast to java.lang.String
at flex.messaging.messages.AbstractMessage.readExternal(AbstractMessage.java:248)
at flex.messaging.messages.AsyncMessage.readExternal(AsyncMessage.java:98)
at flex.messaging.messages.CommandMessage.readExternal(CommandMessage.java:296)
at com.thoughtworks.xstream.converters.reflection.ExternalizableConverter.unmarshal(ExternalizableConverter.java:135)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
... 40 more

[noogrub]

The part I don't know is whether it's possible to simply provide an
additional argument for encoding in XStream. Seems like the elegant,
environment-independent solution if so.

On Wed, Mar 13, 2013 at 11:35 AM, winko notifications@github.com wrote:

That's an idea... I will look for this...

For information I will attach all the debugging information below.

I'm wondering if it is possible (and reasonable) to force an encoding by
the fromXML method of XStream... ?

[winko]

Yes, this would be great....

On the other hand:
I am starting the JVM for JMeter with the argument -Dfile.encoding=ISO-8859-1. Since it is recommended to use the UTF-8 encoding format in Flex (http://www.adobe.com/support/documentation/en/flex/1/internationalization_flex_short/internationalization_flex_short9.html ) I have tried to change the argument to -Dfile.encoding=UTF-8 but then I get another error:

ERROR - jmeter.protocol.amf.util.AmfXmlConverter: An exception was encountered while deserializing response. flex.messaging.io.UnknownTypeException: Unknown AMF type '-65'.
at flex.messaging.io.amf.Amf0Input.readObjectValue(Amf0Input.java:225)
at flex.messaging.io.amf.Amf0Input.readObject(Amf0Input.java:95)
at flex.messaging.io.amf.AmfMessageDeserializer.readObject(AmfMessageDeserializer.java:226)
at flex.messaging.io.amf.AmfMessageDeserializer.readBody(AmfMessageDeserializer.java:205)
at flex.messaging.io.amf.AmfMessageDeserializer.readMessage(AmfMessageDeserializer.java:125)
at org.apache.jmeter.protocol.amf.util.AmfXmlConverter.convertAmfMessageToXml(AmfXmlConverter.java:169)
at org.apache.jmeter.protocol.amf.proxy.AmfRequestHdr.populateSampler(AmfRequestHdr.java:465)
at org.apache.jmeter.protocol.amf.proxy.AmfRequestHdr.getSampler(AmfRequestHdr.java:281)
at org.apache.jmeter.protocol.amf.proxy.AmfProxy.run(AmfProxy.java:224)

This one was already reported within one another issue here.