Java + GWT +服务器端的GSON

发布于 2024-09-04 05:43:49 字数 1470 浏览 6 评论 0原文

我已经读到不可能在 GWT 客户端代码中运行 GSON，但是可以在服务器代码中运行它。

后一个是我正在努力实现的目标，但还没有开始工作。我认为 com.whatever.server 包中的任何类都可以访问整个 JRE 命名空间，包括反射。看来事实并非如此。那么如何管理所有这些开发人员在 GWT 服务器代码中使用 GSON？（我是 GWT 新手，所以答案可能非常简单。）

谢谢。

编辑：我的设置如下：

test.gwt.xml包含：和
客户端使用 private final TestServiceAsync testService = GWT.create(TestService.class); 并调用 testService.testMethod();
TestService 接口和 TestServiceAsync位于包客户端中，
在 test.server 中实现的 TestServiceImpl 使用 Gson g = new Gson(); 等等

抛出的异常是 java.lang.NoClassDefFoundError: com/google/gson/ Gson。但似乎无论该方法是否包含 GSON 代码（只要包含 GSON import-statement 就足够了）都会引发该问题。

Caused by: java.lang.ClassNotFoundException: com.google.gson.Gson
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    ... 33 more

原文

I already read that there is no possibility to run GSON in GWT client code, but that it is possible to run it in server code.

The latter one is which I'm trying to achive, but not getting to work. I thought any class within the com.whatever.server package has access to the whole JRE namespace including reflection. It seems that that is not the case. So how managed all those developers to use GSON in GWT server code? (I'm new to GWT, so the answer may be really easy.)

Thanks.

EDIT: My setting is as follows:

test.gwt.xml contains: <source path='client'> and <source path='shared'>
the client uses private final TestServiceAsync testService = GWT.create(TestService.class); and invokes testService.testMethod();
TestService interface and TestServiceAsync are located in package client
the TestServiceImpl implemented in test.server uses Gson g = new Gson(); and so forth

The exception thrown is java.lang.NoClassDefFoundError: com/google/gson/Gson. But it seems that it is raised no matter whether the method contains GSON code or not (it is sufficient that it contains the GSON import-statement).

Caused by: java.lang.ClassNotFoundException: com.google.gson.Gson
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    ... 33 more

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