通过使用Vaadin-CDI集成插件，将EJB注入到Vaadin 7 UI中

问题描述

我无法成功整合官方的Vaadin-CDI-Integration-Addon，因为在完成官方整合说明之后，以下异常被抛出，以防万一重新加载已发布的U​​RL localhost：8080 / App /？restartApplication 。

I wasn't able to successfully integrate the official Vaadin-CDI-Integration-Addon, since after finishing the official integration instructions, the following Exception was thrown in case I reloaded the already published URL localhost:8080/App/?restartApplication.

javax.servlet.ServletException: com.vaadin.server.ServiceException:
java.lang.IllegalStateException: UI id has already been defined

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以下几个解决方法是一个经过测试的工作解决方案，可以完成官方说明。

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The following little workaround is a tested, working solution, which completes the official instructions.

推荐答案

您必须执行以下步骤才能将官方CDI-Integration-Addon成功整合到您的Vaadin项目中。

You have to work off the following steps to successfully integrate the official CDI-Integration-Addon into your Vaadin project.

• 根据。


• 从URL中删除？restartApplication 参数。这样避免了异常。


• 按照下面的清单注入EJB。


• 请注意，如果需要，请手动重新启动应用程序！

• Do exactly as stated in the official how-to.
• Remove the ?restartApplication parameter from the URL. This avoids the Exception.
• Inject the EJB as shown in the listing below.
• Keep in mind to restart your application manually if necessary!

@CDIUI
public class ExampleCDIUI extends UI {

    @Inject
    MyLocalBeanInterface myBean;

    @Override
    public void init(VaadinRequest request) {
        Label label = new Label("Hello Vaadin user");
        setContent(label);

        // myBean should be accessible now.

    }

}

就是这样。我希望这有助于： - ）

That's it. I hope this helps :-)

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