Result Variable in JavaDelegate

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boekhold

Hi,

When creating a BPMN model, there is a configuration field on a ServiceTask "Result variable". If my ServiceTask uses a delegateExpression backed by a JavaDelegate, can I access the value specified for "Result variable" so I can place the result in the requested variable?

Maarten

balsarori

The purpose of result variable is to save the service task result (for service task using expression only). For example,

<br><serviceTask id="serviceTask"<br>&nbsp;&nbsp;&nbsp; activiti:expression="#{myService.toUpperCase(myVar)}"<br>&nbsp;&nbsp;&nbsp; activiti:resultVariable="myVar" /><br>[java]
public class MyService {
  public String toUpperCase(String val) {
    return val.toUpperCase();
  }
}
[/java]
In above example, the myVar process variable will be updated to the value returned by the expression. This is useful when you want to use/build services that do not have dependency to Activiti.

When using JavaDelegate (either by using delegateExpression or using activiti:class attribute), the resultVariable has no meaning in that case since variables can be modified directly using the DelegateExecution instance (additionally the execute method return type is void). The above example can be done using the JavaDelegate as follows

[java]
public class MyService implements JavaDelegate {
  public void execute(DelegateExecution execution) throws Exception {
    String myVar = (String) execution.getVariable("myVar");
    execution.setVariable("myVar", myVar.toUpperCase());
  }
}
[/java]