Program: 132176
Project: 132176
Buggy source:
@Override public Future<RpcResult<InstantiateServiceFunctionChainOutput>> instantiateServiceFunctionChain(InstantiateServiceFunctionChainInput input){
  if (dataBroker != null) {
    ServiceFunctionChain chain=findServiceFunctionChain(input.getName());
    if (chain != null) {
      List<SfcServiceFunction> sfRefList=chain.getSfcServiceFunction();
      LOG.debug("String_Node_Str" + sfRefList);
      if (sfRefList != null && sfRefList.size() > 0) {
        ServiceFunctionPathBuilder pathBuilder=new ServiceFunctionPathBuilder();
        List<ServicePathHop> instances=new ArrayList<>();
        Random rand=new Random();
        for (        SfcServiceFunction ref : sfRefList) {
          List<ServicePathHop> instanceList=findInstancesByType(ref.getType());
          LOG.debug("String_Node_Str" + instanceList);
          if (instanceList != null && instanceList.size() > 0) {
            instances.add(instanceList.get(rand.nextInt(instanceList.size())));
          }
 else {
            throw new IllegalStateException("String_Node_Str" + ref.getName() + "String_Node_Str");
          }
        }
        String pathName=input.getName() + "String_Node_Str" + java.lang.System.currentTimeMillis();
        ServiceFunctionPath path=pathBuilder.setName(pathName).setServicePathHop(instances).setServiceChainName(input.getName()).build();
        List<ServiceFunctionPath> list=new ArrayList<>();
        list.add(path);
        ServiceFunctionPaths paths=buildServiceFunctionPaths(list);
        WriteTransaction writeTx=dataBroker.newWriteOnlyTransaction();
        writeTx.merge(LogicalDatastoreType.CONFIGURATION,OpendaylightSfc.sfpIID,paths,true);
        writeTx.commit();
        InstantiateServiceFunctionChainOutputBuilder outputBuilder=new InstantiateServiceFunctionChainOutputBuilder();
        outputBuilder.setName(pathName);
        return Futures.immediateFuture(Rpcs.getRpcResult(true,outputBuilder.build(),Collections.<RpcError>emptySet()));
      }
 else {
        throw new IllegalStateException("String_Node_Str");
      }
    }
 else {
      throw new IllegalStateException("String_Node_Str" + input.getName() + "String_Node_Str");
    }
  }
 else {
    LOG.warn("String_Node_Str",Thread.currentThread().getStackTrace()[1]);
  }
  return Futures.immediateFuture(Rpcs.<InstantiateServiceFunctionChainOutput>getRpcResult(false,Collections.<RpcError>emptySet()));
}

Fixed version (ground truth):
@Override public Future<RpcResult<InstantiateServiceFunctionChainOutput>> instantiateServiceFunctionChain(InstantiateServiceFunctionChainInput input){
  if (dataBroker != null) {
    ServiceFunctionChain chain=findServiceFunctionChain(input.getName());
    if (chain != null) {
      List<SfcServiceFunction> sfRefList=chain.getSfcServiceFunction();
      LOG.debug("String_Node_Str" + sfRefList);
      if (sfRefList != null && sfRefList.size() > 0) {
        ServiceFunctionPathBuilder pathBuilder=new ServiceFunctionPathBuilder();
        List<ServicePathHop> instances=new ArrayList<>();
        Random rand=new Random();
        for (        SfcServiceFunction ref : sfRefList) {
          List<ServicePathHop> instanceList=findInstancesByType(ref.getType());
          LOG.debug("String_Node_Str" + instanceList);
          if (instanceList != null && instanceList.size() > 0) {
            instances.add(instanceList.get(rand.nextInt(instanceList.size())));
          }
 else {
            throw new IllegalStateException("String_Node_Str" + ref.getName() + "String_Node_Str");
          }
        }
        String pathName=input.getName() + "String_Node_Str" + java.lang.System.currentTimeMillis();
        ServiceFunctionPath path=pathBuilder.setName(pathName).setServicePathHop(instances).setServiceChainName(input.getName()).build();
        List<ServiceFunctionPath> list=new ArrayList<>();
        list.add(path);
        ServiceFunctionPaths paths=buildServiceFunctionPaths(list);
        WriteTransaction writeTx=dataBroker.newWriteOnlyTransaction();
        writeTx.merge(LogicalDatastoreType.CONFIGURATION,OpendaylightSfc.SFP_IID,paths,true);
        writeTx.commit();
        InstantiateServiceFunctionChainOutputBuilder outputBuilder=new InstantiateServiceFunctionChainOutputBuilder();
        outputBuilder.setName(pathName);
        return Futures.immediateFuture(Rpcs.getRpcResult(true,outputBuilder.build(),Collections.<RpcError>emptySet()));
      }
 else {
        throw new IllegalStateException("String_Node_Str");
      }
    }
 else {
      throw new IllegalStateException("String_Node_Str" + input.getName() + "String_Node_Str");
    }
  }
 else {
    LOG.warn("String_Node_Str",Thread.currentThread().getStackTrace()[1]);
  }
  return Futures.immediateFuture(Rpcs.<InstantiateServiceFunctionChainOutput>getRpcResult(false,Collections.<RpcError>emptySet()));
}