Hi Steve,
On 6/14/2012 4:18 PM, Steven North wrote:
Hello,
Back in September 2011 I posted about problems moving from RHQ 4.0.1 to 4.1 and was able
to resolve the problem by stepping up to the 4.1 JARs to talk to the 4.1 and 4.01 RHQ
server. Well, now I'm back with problems stepping up to RHQ 4.4 libraries. In this
case we are trying to talk to both a JON 3.01 (=RHQ 4.2) and JON 3.1beta (=RHQ 4.4)
server. The RHQ 4.1 libraries worked fine with the JON 3.01 server but not with the JON
3.1beta server, so we stepped up to the RHQ 4.4 libraries. These work with the JON
3.1beta server but not with JON 3.01(= RHQ 4.2) nor with an RHQ 4.1 server.
Below is the trraceback from trying to connect to either an RHQ 4.1 or an RHQ 4.2 server
using the RHQ 4.4 libraries.
Is this a known and purposeful incompatibility or is this unexpected. Is there anything
we can do about this other than use different sets of libraries for each RHQ server
version (that differs)
This was a purposeful change that unintentionally affected
backward
compatibility. We have maintained backward compatibility with existing
scripts, meaning the API, but we have not maintained backward
compatibility with newer clients talking to older servers. It would be
nice if it worked but it's not an explicit goal of the project. Only
API compatibility is an explicit goal. The Availability class had some
changes to the data types of existing fields, therefore breaking
serialization between the old and new version.
This change went in with RHQ 4.4. Only the 4.4 client will work with a
4.4 server, or a JON 3.1 server. It is possible, although not
confirmed, that an RHQ 4.3 API may work for earlier versions of RHQ and
JON 3.0.x.
Thanks in advance,
Steve
Caused by: org.jboss.remoting.CannotConnectException: Can not connect http client
invoker. org.rhq.core.domain.measurement.Availability; incompatible types for field
startTime. Response: OK/200.
at
org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:348)
at
org.jboss.remoting.transport.http.HTTPClientInvoker.transport(HTTPClientInvoker.java:137)
at
org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:122)
at org.jboss.remoting.Client.invoke(Client.java:1634)
at org.jboss.remoting.Client.invoke(Client.java:548)
at org.jboss.remoting.Client.invoke(Client.java:536)
at org.rhq.enterprise.clientapi.RemoteClientProxy.doInvoke(RemoteClientProxy.java:85)
at
org.rhq.bindings.client.AbstractRhqFacadeProxy.invoke(AbstractRhqFacadeProxy.java:87)
at org.rhq.enterprise.clientapi.RemoteClientProxy.invoke(RemoteClientProxy.java:69)
at $Proxy7.getCurrentAvailabilityForResource(Unknown Source)
at
com.ocsystems.rtiee.util.jon.JonClientSession.isResourceAvailable(JonClientSession.java:4598)
... 8 more
Caused by: java.io.InvalidClassException: org.rhq.core.domain.measurement.Availability;
incompatible types for field startTime
at java.io.ObjectStreamClass.matchFields(ObjectStreamClass.java:2205)
at java.io.ObjectStreamClass.getReflector(ObjectStreamClass.java:2100)
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:600)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1582)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at
org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObjectVersion2_2(JavaSerializationManager.java:239)
at
org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:133)
at
org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:120)
at org.jboss.remoting.marshal.http.HTTPUnMarshaller.read(HTTPUnMarshaller.java:69)
at
org.jboss.remoting.transport.http.HTTPClientInvoker.readResponse(HTTPClientInvoker.java:516)
at
org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:307)
... 18 more
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