使用GWT和GAE进行JUnit测试 [英] JUnit testing with GWT and GAE
问题描述
我希望有一些JUnit测试(使用GWT创建)来联系一个servlet(内部有GAE调用)。
当我运行测试时,我得到了以下堆栈跟踪:
java.lang.NullPointerException
at com .google.appengine.api.NamespaceManager.get(NamespaceManager.java:101)
,位于com.google.appengine.api.memcache.BaseMemcacheServiceImpl.getEffectiveNamespace(BaseMemcacheServiceImpl.java:65)
,位于com.google .appengine.api.memcache.AsyncMemcacheServiceImpl.doGet(AsyncMemcacheServiceImpl.java:295)
在com.google.appengine.api.memcache.AsyncMemcacheServiceImpl.contains(AsyncMemcacheServiceImpl.java:283)
在com.google .appengine.api.memcache.MemcacheServiceImpl.contains(MemcacheServiceImpl.java:44)
at com.peerkesoftware.etheria.web.server.model.UpdateTimer。< init>(UpdateTimer.java:17)
。在com.peerkesoftware.etheria.web.server.UpdateTimerServlet<初始化>(UpdateTimerServlet.java:12)
。在sun.reflect.NativeConstructorAccessorImpl.newInstance0(本机方法)
。在sun.reflect。 NativeConstructorAccessorI mpl.newInstance(NativeConstructorAccessorImpl.java:39)
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
在java.lang.reflect.Constructor.newInstance(Constructor.java:513)
在java.lang.Class.newInstance0(Class.java:355)
在java.lang.Class.newInstance(Class.java:308)
在org.mortbay.jetty.servlet .Holder.newInstance(Holder.java:153)
在org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
在org.mortbay.jetty.servlet.ServletHolder.handle (ServletHolder.java:463)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java :216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
在org.mortbay.jetty.webapp.WebAppContext.handl e(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler。 java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
。在org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)在org.mortbay.jetty.HttpConnection $ RequestHandler.headerComplete
(HttpConnection.java:829)
在org.mortbay .jetty.HttpParser.parseNext(HttpParser.java:513)
在org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
在org.mortbay.jetty.HttpConnection.handle(HttpConnection的.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool $ PoolThread.run(QueuedThreadPool.java:488 )
有人可以向我解释为什么这是怎么回事?我该如何解决这个问题?我需要在运行测试之前初始化一些东西吗?
我使用GWT 2.5.1版和GAE 1.7.5版。
我的代码可以在 GitHub 上查看。
我自己想清楚了。
我使用的解决方案是:创建LocalServiceTestHelper并在对我的servlet进行任何调用之前进行设置。然后,我所有的JUnit测试都是绿色的。
I want to have some JUnit test (created with GWT) to contact a servlet (with GAE calls inside). When I run the test I get the following stacktrace:
java.lang.NullPointerException
at com.google.appengine.api.NamespaceManager.get(NamespaceManager.java:101)
at com.google.appengine.api.memcache.BaseMemcacheServiceImpl.getEffectiveNamespace(BaseMemcacheServiceImpl.java:65)
at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl.doGet(AsyncMemcacheServiceImpl.java:295)
at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl.contains(AsyncMemcacheServiceImpl.java:283)
at com.google.appengine.api.memcache.MemcacheServiceImpl.contains(MemcacheServiceImpl.java:44)
at com.peerkesoftware.etheria.web.server.model.UpdateTimer.<init>(UpdateTimer.java:17)
at com.peerkesoftware.etheria.web.server.UpdateTimerServlet.<init>(UpdateTimerServlet.java:12)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:829)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Can someone explain to me why this is happening? And how can I resolve this? Do I need to initialize something before running the test?
I'm using GWT version 2.5.1 and GAE version 1.7.5.
My code can be viewed at GitHub.
I figured it out myself.
The solution that I used: Create LocalServiceTestHelper and set this up before doing any calls to my servlets. Then all my JUnit tests are green.
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