Program: 117869
Project: 117869
Buggy source:
@Override public ExecutionResult execute(Item item){
  if (item instanceof DatabaseConnectionItem) {
    ProxyRepositoryFactory factory=ProxyRepositoryFactory.getInstance();
    DatabaseConnectionItem connectionItem=(DatabaseConnectionItem)item;
    DatabaseConnection connection=(DatabaseConnection)connectionItem.getConnection();
    if (connection instanceof DatabaseConnection) {
      DatabaseConnection dbConnection=connection;
      String dbType=dbConnection.getDatabaseType();
      if (dbType == null || !dbType.equals("String_Node_Str")) {
        return null;
      }
      String jdbcType="String_Node_Str";
      dbConnection.setDatabaseType(jdbcType);
      connectionItem.setTypeName(jdbcType);
      IGenericDBService dbService=null;
      if (GlobalServiceRegister.getDefault().isServiceRegistered(IGenericDBService.class)) {
        dbService=(IGenericDBService)GlobalServiceRegister.getDefault().getService(IGenericDBService.class);
      }
      if (dbService == null) {
        return null;
      }
      boolean isContextMode=connection.isContextMode();
      Properties properties=dbService.getComponentProperties(jdbcType,dbConnection.getId());
      Property url=(Property)properties.getProperty("String_Node_Str");
      Property driClass=(Property)properties.getProperty("String_Node_Str");
      Property user=(Property)properties.getProperty("String_Node_Str");
      Property pass=(Property)properties.getProperty("String_Node_Str");
      Property dirJar=(Property)properties.getProperty("String_Node_Str");
      Property mappingFile=(Property)properties.getProperty("String_Node_Str");
      if (url != null) {
        url.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        url.setTaggedValue(IGenericConstants.REPOSITORY_VALUE,url.getName());
        url.setValue(connection.getURL());
      }
      if (driClass != null) {
        driClass.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        driClass.setTaggedValue(IGenericConstants.REPOSITORY_VALUE,driClass.getName());
        driClass.setValue(connection.getDriverClass());
      }
      if (user != null) {
        user.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        user.setTaggedValue(IGenericConstants.REPOSITORY_VALUE,user.getName());
        user.setValue(connection.getUsername());
      }
      if (pass != null) {
        pass.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        pass.setTaggedValue(IGenericConstants.REPOSITORY_VALUE,pass.getName());
        String password=connection.getValue(connection.getRawPassword(),false);
        pass.setValue(password);
      }
      if (mappingFile != null) {
        mappingFile.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        mappingFile.setValue(connection.getDbmsId());
      }
      setDrivers(dirJar,connection.getDriverJarPath(),isContextMode);
      connection.setCompProperties(properties.toSerialized());
      try {
        factory.save(item,true);
        return ExecutionResult.SUCCESS_WITH_ALERT;
      }
 catch (      Exception e) {
        ExceptionHandler.process(e);
        return ExecutionResult.FAILURE;
      }
    }
  }
  return ExecutionResult.NOTHING_TO_DO;
}

Fixed version (ground truth):
@Override public ExecutionResult execute(Item item){
  if (item instanceof DatabaseConnectionItem) {
    ProxyRepositoryFactory factory=ProxyRepositoryFactory.getInstance();
    DatabaseConnectionItem connectionItem=(DatabaseConnectionItem)item;
    DatabaseConnection connection=(DatabaseConnection)connectionItem.getConnection();
    if (connection instanceof DatabaseConnection) {
      DatabaseConnection dbConnection=connection;
      String dbType=dbConnection.getDatabaseType();
      if (dbType == null || !dbType.equals("String_Node_Str")) {
        return ExecutionResult.NOTHING_TO_DO;
      }
      String jdbcType="String_Node_Str";
      dbConnection.setDatabaseType(jdbcType);
      connectionItem.setTypeName(jdbcType);
      IGenericDBService dbService=null;
      if (GlobalServiceRegister.getDefault().isServiceRegistered(IGenericDBService.class)) {
        dbService=(IGenericDBService)GlobalServiceRegister.getDefault().getService(IGenericDBService.class);
      }
      if (dbService == null) {
        return ExecutionResult.NOTHING_TO_DO;
      }
      boolean isContextMode=connection.isContextMode();
      Properties properties=dbService.getComponentProperties(jdbcType,dbConnection.getId());
      Property url=(Property)properties.getProperty("String_Node_Str");
      Property driClass=(Property)properties.getProperty("String_Node_Str");
      Property user=(Property)properties.getProperty("String_Node_Str");
      Property pass=(Property)properties.getProperty("String_Node_Str");
      Property dirJar=(Property)properties.getProperty("String_Node_Str");
      Property mappingFile=(Property)properties.getProperty("String_Node_Str");
      if (url != null) {
        url.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        url.setTaggedValue(IGenericConstants.REPOSITORY_VALUE,url.getName());
        url.setValue(connection.getURL());
      }
      if (driClass != null) {
        driClass.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        driClass.setTaggedValue(IGenericConstants.REPOSITORY_VALUE,driClass.getName());
        driClass.setValue(connection.getDriverClass());
      }
      if (user != null) {
        user.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        user.setTaggedValue(IGenericConstants.REPOSITORY_VALUE,user.getName());
        user.setValue(connection.getUsername());
      }
      if (pass != null) {
        pass.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        pass.setTaggedValue(IGenericConstants.REPOSITORY_VALUE,pass.getName());
        String password=connection.getValue(connection.getRawPassword(),false);
        pass.setValue(password);
      }
      if (mappingFile != null) {
        mappingFile.setTaggedValue(IGenericConstants.IS_CONTEXT_MODE,isContextMode);
        mappingFile.setValue(connection.getDbmsId());
      }
      setDrivers(dirJar,connection.getDriverJarPath(),isContextMode);
      connection.setCompProperties(properties.toSerialized());
      try {
        factory.save(item,true);
        return ExecutionResult.SUCCESS_WITH_ALERT;
      }
 catch (      Exception e) {
        ExceptionHandler.process(e);
        return ExecutionResult.FAILURE;
      }
    }
  }
  return ExecutionResult.NOTHING_TO_DO;
}