Program: 60543
Project: 60543
Buggy source:
public ConnInstance updateConnInstance(final long connInstanceId,final ConnInstanceTO connInstanceTO){
  SyncopeClientCompositeErrorException scce=new SyncopeClientCompositeErrorException(HttpStatus.BAD_REQUEST);
  SyncopeClientException requiredValuesMissing=new SyncopeClientException(SyncopeClientExceptionType.RequiredValuesMissing);
  if (connInstanceId == 0) {
    requiredValuesMissing.addElement("String_Node_Str");
  }
  ConnInstance connInstance=connInstanceDAO.find(connInstanceId);
  if (connInstanceTO.getLocation() != null) {
    connInstance.setLocation(connInstanceTO.getLocation().toString());
  }
  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());
  }
  if (connInstanceTO.getConnRequestTimeout() != null) {
    connInstance.setConnRequestTimeout(connInstanceTO.getConnRequestTimeout());
  }
  connInstance.setCapabilities(connInstanceTO.getCapabilities());
  if (!requiredValuesMissing.isEmpty()) {
    scce.addException(requiredValuesMissing);
  }
  if (scce.hasExceptions()) {
    throw scce;
  }
  return connInstance;
}

Fixed version (ground truth):
public ConnInstance updateConnInstance(final long connInstanceId,final ConnInstanceTO connInstanceTO){
  SyncopeClientCompositeErrorException scce=new SyncopeClientCompositeErrorException(HttpStatus.BAD_REQUEST);
  SyncopeClientException requiredValuesMissing=new SyncopeClientException(SyncopeClientExceptionType.RequiredValuesMissing);
  if (connInstanceId == 0) {
    requiredValuesMissing.addElement("String_Node_Str");
  }
  ConnInstance connInstance=connInstanceDAO.find(connInstanceId);
  if (connInstanceTO.getLocation() != null) {
    connInstance.setLocation(connInstanceTO.getLocation());
  }
  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());
  }
  if (connInstanceTO.getConnRequestTimeout() != null) {
    connInstance.setConnRequestTimeout(connInstanceTO.getConnRequestTimeout());
  }
  connInstance.setCapabilities(connInstanceTO.getCapabilities());
  if (!requiredValuesMissing.isEmpty()) {
    scce.addException(requiredValuesMissing);
  }
  if (scce.hasExceptions()) {
    throw scce;
  }
  return connInstance;
}