public void testVariables()
  {
    // save a variable
    final ExecutionService executionService = processEngine.getExecutionService();
    // the used process doesn´t matter, I only need an executionId to store / read a Variable
    final ProcessInstance processInstance = executionService.startProcessInstanceByKey("PtoBM");
    final String executionId = processInstance.getId();
    final String variableName = "name";
    final String variableValue = "value";
    executionService.setVariable(executionId, variableName, variableValue);

    // read Variable
    final CommandService commandService = processEngine.get(CommandService.class);
    commandService.execute(new Command()
    {

      public Object execute(final Environment environment) throws Exception
      {
        final DbSession dbSession = environment.get(DbSession.class);
        final ClientExecution execution = dbSession.findExecutionById(executionId);
        final Variable variable = ((ScopeInstanceImpl) execution).getVariableObject(variableName);

        // validate value
        final Object value = variable.getValue();
        assertEquals(variableValue, value);

        // validate textValue
        final String textValue = variable.getTextValue();
        // next line fails, cause hibernate instantiate the Variable over field access!
        assertEquals(variableValue, textValue);
        return null;
      }
    });
  }