将Activiti与JSF集成

Question

我试图从jsf启动激活引擎

@ManagedBean(name = "activitiProcess")
@ViewScoped
public class ActivitiProcess implements Serializable {

    private String  filename    = "D:/WORKSPACE/activiti1/src/main/resources/diagrams/MyProcess.bpmn";

    public ActivitiProcess() {

    }

    public void startProcess() {

        System.out.println("hello world");
        try {

            ProcessEngine engine = ProcessEngines.getDefaultProcessEngine(); //returns null


            RepositoryService repositoryService = engine.getRepositoryService();
            repositoryService.createDeployment().addInputStream("myProcess.bpmn20.xml", new FileInputStream(filename)).deploy();
            RuntimeService runtimeService = engine.getRuntimeService();

            ProcessDefinition definition = engine.getRepositoryService().createProcessDefinitionQuery().processDefinitionKey("myProcess").singleResult();

            FormService formService = engine.getFormService();
            // List<FormProperty> formList = formService.getStartFormData(definition.getId()).getFormProperties();

            Map<String, String> formProperties = new HashMap<String, String>();
            /* use the jsf variable instead */
            formProperties.put("filePath", "D://somePath");
            formService.submitStartFormData(definition.getId(), formProperties);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

引擎总是以null返回，我读到activiti.cfg.xml文件应该在类路径中，我已经把文件放在web-inf/class下，但是引擎仍然返回null，这意味着激活不能初始化引擎，有什么想法吗？

Answer 1

添加此

@Inject
 private ProcessEngine engine;

如果希望在容器内运行CDIBean，则不允许使用new关键字。相反，您需要注入bean，容器完成其余工作，也就是说，容器负责管理bean的生命周期：它创建实例；它摆脱了它。那么，如果不能调用构造函数，如何初始化bean呢？好的，容器在构造实例之后和销毁实例之前为您提供了一个句柄。