Program: 60950
Project: 60950
Buggy source:
public ConnInstance updateConnInstance(Long connectorInstanceId,ConnInstanceTO connInstanceTO) throws SyncopeClientCompositeErrorException {
  SyncopeClientCompositeErrorException compositeErrorException=new SyncopeClientCompositeErrorException(HttpStatus.BAD_REQUEST);
  SyncopeClientException requiredValuesMissing=new SyncopeClientException(SyncopeClientExceptionType.RequiredValuesMissing);
  if (connectorInstanceId == null) {
    requiredValuesMissing.addElement("String_Node_Str");
  }
  ConnInstance connInstance=connectorInstanceDAO.find(connectorInstanceId);
  if (connInstanceTO.getBundleName() != null) {
    connInstance.setBundleName(connInstanceTO.getBundleName());
  }
  if (connInstanceTO.getVersion() != null) {
    connInstance.setVersion(connInstanceTO.getVersion());
  }
  if (connInstanceTO.getConnectorName() != null) {
    connInstance.setConnectorName(connInstanceTO.getConnectorName());
  }
  if (connInstanceTO.getConfiguration() != null && !connInstanceTO.getConfiguration().isEmpty()) {
    connInstance.setConfiguration(connInstanceTO.getConfiguration());
  }
  if (connInstanceTO.getDisplayName() != null) {
    connInstance.setDisplayName(connInstanceTO.getDisplayName());
  }
  connInstance.setCapabilities(connInstanceTO.getCapabilities());
  if (connInstanceTO.getSyncToken() == null) {
    connInstance.setSerializedSyncToken(null);
  }
  if (!requiredValuesMissing.getElements().isEmpty()) {
    compositeErrorException.addException(requiredValuesMissing);
  }
  if (compositeErrorException.hasExceptions()) {
    throw compositeErrorException;
  }
  return connInstance;
}

Fixed version (ground truth):
public ConnInstance updateConnInstance(final Long connectorInstanceId,final ConnInstanceTO connInstanceTO) throws SyncopeClientCompositeErrorException {
  SyncopeClientCompositeErrorException compositeErrorException=new SyncopeClientCompositeErrorException(HttpStatus.BAD_REQUEST);
  SyncopeClientException requiredValuesMissing=new SyncopeClientException(SyncopeClientExceptionType.RequiredValuesMissing);
  if (connectorInstanceId == null) {
    requiredValuesMissing.addElement("String_Node_Str");
  }
  ConnInstance connInstance=connectorInstanceDAO.find(connectorInstanceId);
  if (connInstanceTO.getBundleName() != null) {
    connInstance.setBundleName(connInstanceTO.getBundleName());
  }
  if (connInstanceTO.getVersion() != null) {
    connInstance.setVersion(connInstanceTO.getVersion());
  }
  if (connInstanceTO.getConnectorName() != null) {
    connInstance.setConnectorName(connInstanceTO.getConnectorName());
  }
  if (connInstanceTO.getConfiguration() != null && !connInstanceTO.getConfiguration().isEmpty()) {
    connInstance.setConfiguration(connInstanceTO.getConfiguration());
  }
  if (connInstanceTO.getDisplayName() != null) {
    connInstance.setDisplayName(connInstanceTO.getDisplayName());
  }
  connInstance.setCapabilities(connInstanceTO.getCapabilities());
  if (connInstanceTO.getSyncToken() == null) {
    connInstance.setSerializedSyncToken(null);
  }
  if (!requiredValuesMissing.getElements().isEmpty()) {
    compositeErrorException.addException(requiredValuesMissing);
  }
  if (compositeErrorException.hasExceptions()) {
    throw compositeErrorException;
  }
  return connInstance;
}