2421716 - Common p4 exceptions

You are facing exceptions while trying to use the p4 connection/port.

Exceptions like:

1. com.sap.engine.frame.core.configuration.NameNotFoundException: A config entry with the name XXXXXXXXXX could not be found in the configuration "P4_PersistentObject".
   at com.sap.engine.core.configuration.impl.ReadAccessConfiguration.getConfigEntry(ReadAccessConfiguration.java:1104)
   at com.sap.engine.services.rmi_p4.server.ServerDispatchImpl.writeEntry(ServerDispatchImpl.java:344)
   at com.sap.engine.services.rmi_p4.server.ServerDispatchImpl.checkDB(ServerDispatchImpl.java:430)
   at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:389)
   at com.sap.engine.services.rmi_p4.server.ServerDispatchImpl.run(ServerDispatchImpl.java:69)
   at com.sap.engine.services.rmi_p4.P4Message.process(P4Message.java:72)
    
2. com.sap.engine.services.rmi_p4.server.P4ServerObjectInfo toObject MSG:class com.sap.engine.services.jndi.implserver.ServerContextImpl:com.sap.engine.core.service630.container.ComponentClassLoader@492d49e0@common:service:iiop;service:naming;service:p4;service:ts incompatible with class com.sap.engine.services.rmi_p4.StubBase:com.sap.engine.core.service630.container.ComponentClassLoader@492d49e0@common:service:iiop;service:naming;service:p4;service:ts
    
3. SystemMessageProcessor.openConnection() : Failed to open a connection to 2:1:232.212.40.74:50004, reason: connection refused
   Cannot connect stub via connection profile None:232.212.40.74:50004. Exception: com.sap.engine.services.rmi_p4.P4IOException:
   java.io.IOException: Failed to open a connection to 2:1:232.212.40.74:50004, reason: connection refused
   at com.sap.engine.services.cross.fca.SystemMessageProcessor.openConnection(SystemMessageProcessor.java:246

4. java.lang.IllegalArgumentException: interface com.sap.engine.services.rmi_p4.RemoteRef is not visible from class loader
   at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:589)
   at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:566)
   at java.lang.reflect.WeakCache$Factory.get(WeakCache.java:228)
   at java.lang.reflect.WeakCache.get(WeakCache.java:126)
   at java.lang.reflect.Proxy.getProxyClass0(Proxy.java:430)
   at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:705)
   at com.sap.engine.services.rmi_p4.server.P4ObjectBrokerServerImpl.loadLocalStub(P4ObjectBrokerServerImpl.java:748)
   at com.sap.engine.services.rmi_p4.server.P4ObjectBrokerServerImpl.narrow(P4ObjectBrokerServerImpl.java:598)
   at com.sap.engine.services.rmi_p4.server.P4ObjectBrokerServerImpl.narrow(P4ObjectBrokerServerImpl.java:523)
   at com.sap.engine.services.rmi_p4.ReplicateInputStream.resolveObject(ReplicateInputStream.java:169)
   at java.io.ObjectInputStream.checkResolve(ObjectInputStream.java:1386)
   class com.sap.engine.services.rmi_p4.server.P4ObjectBrokerServerImpl narrow() info class : class com.sun.proxy.$Proxy34 stubClass : interface java.rmi.Remote <> classloader : null

5. Resolving of initial object from remote side failed. Check InitialContext's properties. Check exception for details: com.sap.engine.services.rmi_p4.P4RuntimeException: Cannot replicate parameters or return value of local stub
   at com.sap.engine.services.rmi_p4.StubImpl.p4_initializeStreams(StubImpl.java:347)
   at com.sap.engine.services.rmi_p4.StubImpl.p4_replicate(StubImpl.java:332)
   at com.sap.engine.services
   Caused by: java.lang.ClassNotFoundException: com.sap.engine.services.dsr.server.DSRTransferable

   ------------------ Loader Info -------------------------
   ClassLoader name: [library:p4lib]
   Loader * code: 2ccd12ac
   Living status: alive
   Direct parent loaders:
   [system:Frame]
   [library:httpclient]
   [interface:cross]
   Resources:
   /usr/sap/XXX/J00/j2ee/cluster/bin/ext/p4lib/lib/sap.com p4lib.jar
   ---------------------------------------------------------------
   at com.sap.engine.boot.loader.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:278)
   at com.sap.engine.boot.loader.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:247)
   at com.sap.engine.services.rmi_p4.ReplicateInputStream.resolveClass(ReplicateInputStream.java:93)
   at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1580)
   at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1501)
   at java.io.ObjectInputStream.readClass(ObjectInputStream.java:1467)
   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1317)
   at java.io.ObjectInputStream.readObject(ObjectInputStream.java:356)
   at com.sap.engine.services.rmi_p4.StubImpl.p4_initializeStreams(StubImpl.java:342)

The exceptions can happen during a connection attempt, which can be manual, or automatic, requested by an application. It can also happen during a connection test with note 2134934.

SAP NetWeaver Application Server Java

NameNotFoundException, P4_PersistentObject, A config entry with the name, could not be found in the configuration, P4ServerObjectInfo toObject, Failed to open a connection to, reason: connection refused, IllegalArgumentException, interface is not visible from class loader, interface java.rmi.Remote <> classloader : null, P4ObjectBrokerServerImpl, Resolving of initial object from remote side failed, Cannot replicate parameters or return value of local stub , KBA , BC-JAS-COR-RMT , RMI, P4, CORBA, IIOP , Problem