Exception while connecting to Emerson Deltav OPC Server using Openscada lib
maged Emara
Hello dears,
I’ve couple of questions regarding openscada library, one general and one specific I assume that latest library version is 1.5 which I can found at Maven .
1- OPC open foundation specification implementation in openscada library
Q: Is the referred version of openscada supporting OPC DA 2.05A or only OPC DA 2.0 ? and if not supported is there any other alternative library to connect to Emerson Deltav OPC server supporting DA 2.05A specifications.
My understanding that OPC DA 3.0 is not supported yet
2- Same Emerson Deltav is throwing is nullpointerexpection while creating the Server object using either classid or progid, we don’t suspect the parameter used (domain, classid, credentials, ..) as we verified them with other OPC test clients.
Below is the exact exception stacktrace and the identifed snippet throwing the nullpointerexcpetion after debugging the code.
Stacktrace :
17:08:51.526 [Timer-2] INFO o.j.dcom.core.JIComOxidRuntime - Running ServerPingTimerTask !
17:08:51.526 [Timer-1] INFO o.j.dcom.core.JIComOxidRuntime - Running ClientPingTimerTask !
17:08:51.526 [main] INFO org.jinterop.dcom.core.JISession - Created Session: 623627786
Nov 22, 2019 5:08:51 PM org.jinterop.dcom.common.JISystem internal_dumpMap
INFO: mapOfHostnamesVsIPs: {}
17:08:51.541 [main] DEBUG o.j.dcom.transport.JIComTransport - Opening socket on /192.168.1.1:135
Nov 22, 2019 5:08:51 PM rpc.DefaultConnection processOutgoing
INFO:
Sending BIND
Nov 22, 2019 5:08:51 PM rpc.DefaultConnection processIncoming
INFO:
Recieved BIND_ACK
Nov 22, 2019 5:08:51 PM rpc.DefaultConnection processOutgoing
INFO:
Sending AUTH3
Nov 22, 2019 5:08:51 PM rpc.DefaultConnection processOutgoing
INFO:
Sending ALTER_CTX
Nov 22, 2019 5:08:52 PM rpc.DefaultConnection processIncoming
INFO:
Recieved ALTER_CTX_RESP
Nov 22, 2019 5:08:52 PM rpc.DefaultConnection processOutgoing
INFO:
Sending REQUEST
Nov 22, 2019 5:08:52 PM rpc.DefaultConnection processIncoming
INFO:
Recieved RESPONSE
17:08:52.126 [main] WARN org.openscada.opc.lib.da.Server - Unknown error
java.lang.NullPointerException: null
at org.jinterop.dcom.core.JIComServer.init(Unknown Source) ~[OPCConnectionTester_console.jar:na]
at org.jinterop.dcom.core.JIComServer.initialise(Unknown Source) ~[OPCConnectionTester_console.jar:na]
at org.jinterop.dcom.core.JIComServer.<init>(Unknown Source) ~[OPCConnectionTester_console.jar:na]
at org.openscada.opc.lib.da.Server.connect(Server.java:117) ~[OPCConnectionTester_console.jar:na]
at jfc2.GetAllTags.main(GetAllTags.java:43) [OPCConnectionTester_console.jar:na]
17:08:52.126 [main] INFO org.openscada.opc.lib.da.Server - Destroying DCOM session...
17:08:52.130 [main] INFO org.openscada.opc.lib.da.Server - Destroying DCOM session... forked
java.lang.RuntimeException: java.lang.NullPointerException17:08:52.131 [OPCSessionDestructor] DEBUG org.openscada.opc.lib.da.Server - Starting destruction of DCOM session
17:08:52.132 [OPCSessionDestructor] INFO org.jinterop.dcom.core.JISession - About to destroy 0 sessesion which are linked to this session: 623627786
at org.openscada.opc.lib.da.Server.connect(Server.java:149)
17:08:52.134 [OPCSessionDestructor] INFO o.j.dcom.core.JIComOxidRuntime - destroySessionOIDs for session: 623627786
at jfc2.GetAllTags.main(GetAllTags.java:43)17:08:52.136 [OPCSessionDestructor] INFO org.openscada.opc.lib.da.Server - Destructed DCOM session
17:08:52.141 [OPCSessionDestructor] INFO org.openscada.opc.lib.da.Server - Session destruction took 10 ms
Caused by: java.lang.NullPointerException
at org.jinterop.dcom.core.JIComServer.init(Unknown Source)
at org.jinterop.dcom.core.JIComServer.initialise(Unknown Source)
at org.jinterop.dcom.core.JIComServer.<init>(Unknown Source)
at org.openscada.opc.lib.da.Server.connect(Server.java:117)
... 1 more
Code Snippet (root cause of the exception) :
JIComServer.java// ME: Here dualStringArrayForOxid is null due to this this.remoteActivation.getDualStringArrayForOxid () breaks and return null pointer exceptionprivate void init () throws JIException{ if ( this.remoteActivation != null && this.remoteActivation.isActivationSuccessful () ) { return; } . . . . . // Now will setup syntax for IRemUnknown and the address. this.syntax = "00000143-0000-0000-c000-000000000046:0.0"; //now for the new ip and the port. final JIStringBinding[] bindings = this.remoteActivation.getDualStringArrayForOxid ().getStringBindings (); } //ME: Here skipdual is set to 0, which does not set this.dualStringArrayForOxid and remains nullJIRemActiviation.java@Override public void read ( final NetworkDataRepresentation ndr ) { //first take out JIOrpcThat this.orpcthat = JIOrpcThat.decode ( ndr ); //now fill the oxid this.oxid = JIMarshalUnMarshalHelper.readOctetArrayLE ( ndr, 8 ); final int skipdual = ndr.readUnsignedLong (); if ( skipdual != 0 ) { ndr.readUnsignedLong (); //now fill the dual string array for oxid bindings, the call to IRemUnknown will be //directed to this address and the port in that address. this.dualStringArrayForOxid = JIDualStringArray.decode ( ndr ); }
