The stub received bad data.

[Percy]

I'm using j-interop to interact with an opc ae server. I'm getting the following error when calling a function.
org.jinterop.dcom.common.JIException: The stub received bad data. Please check whether the API has been called in the right way, with correct parameter formation. [0x800706F7]
at org.jinterop.dcom.core.JIComServer.call(JIComServer.java:994)
at org.jinterop.dcom.core.JIComServer.call(JIComServer.java:945)
at org.jinterop.dcom.core.JIComObjectImpl.call(JIComObjectImpl.java:271)
at org.jinterop.dcom.core.JIComObjectImpl.call(JIComObjectImpl.java:156)
at libpercy.opc_ae.IOPCEventServer.CreateEventSubscription(IOPCEventServer.java:35)
at libpercy.opc_ae.COpcAeClient.connect(COpcAeClient.java:109)
at libpercy.opc_ae.COpcAeClient.Connect(COpcAeClient.java:42)
at CManager.<init>(CManager.java:18)
at CManager.<clinit>(CManager.java:36)
at CMain.main(CMain.java:10)
Caused by: rpc.FaultException: Received fault. (unknown)
at rpc.ConnectionOrientedEndpoint.call(ConnectionOrientedEndpoint.java:141)
at rpc.Stub.call(Stub.java:113)
at org.jinterop.dcom.core.JIComServer.call(JIComServer.java:990)
... 9 more

The prototype of this function is:
virtual HRESULT STDMETHODCALLTYPE CreateEventSubscription(
/ [in] / BOOL bActive,
/ [in] / DWORD dwBufferTime,
/ [in] / DWORD dwMaxSize,
/ [in] / OPCHANDLE hClientSubscription,
/ [in] / REFIID riid,
/ [iid_is][out] / LPUNKNOWN ppUnk,
/ [out] / DWORD pdwRevisedBufferTime,
/ [out] / DWORD *pdwRevisedMaxSize) = 0;

And my code is:
public Object[] CreateEventSubscription(
/ [in] / Boolean bActive,
/ [in] / Integer dwBufferTime,
/ [in] / Integer dwMaxSize,
/ [in] / Integer hClientSubscription,
/ [in] / String riid
)
{
JICallBuilder call_builder=new JICallBuilder();
call_builder.reInit();
call_builder.setOpnum(1);
call_builder.addInParamAsInt(bActive?1:0, JIFlags.FLAG_NULL);
call_builder.addInParamAsInt(dwBufferTime, JIFlags.FLAG_NULL);
call_builder.addInParamAsInt(dwMaxSize, JIFlags.FLAG_NULL);
call_builder.addInParamAsInt(hClientSubscription, JIFlags.FLAG_NULL);
call_builder.addInParamAsUUID(riid, JIFlags.FLAG_NULL);
call_builder.addOutParamAsType(IJIComObject.class, JIFlags.FLAG_NULL);
call_builder.addOutParamAsType(Integer.class, JIFlags.FLAG_NULL);
call_builder.addOutParamAsType(Integer.class, JIFlags.FLAG_NULL);
Object[] ret=null;
try {
ret=Get_com_object().call(call_builder);
} catch (JIException e) {
e.printStackTrace();
}
return ret;
}

[Morten Andersen]

Hi Percy,

For OPC AE you might want to look into the openSCADA Utgard library. It uses j-Interop for the OPC communication. So you don't have to write the low level DCOM OPC calls yourself.

http://openscada.org/projects/utgard/

Best Regards
Morten

[Percy]

openSCADA has implemented OPC DA, but I'm using OPC AE.

[Percy]

Solved by myself. The line
JICallBuilder call_builder=new JICallBuilder();
should be changed to
JICallBuilder call_builder=new JICallBuilder(true);