我在我的智慧結束 - 似乎從未遇到過這個問題。我發現設置快速的HelloWorld應用程序以確保Restlet 2.0已啓動並運行相對容易。但是,我面臨着一個我從未遇到過的奇怪異常。我在我的類路徑罐子以及在WEB-INF/lib文件夾,但由於某種原因,我不斷收到以下異常:爲什麼Restlet無法註冊JSON轉換器?
INFO: Unable to register the helper org.restlet.ext.json.JsonConverter
java.lang.NoClassDefFoundError: org/json/JSONException
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getConstructor0(Class.java:2699)
at java.lang.Class.newInstance0(Class.java:326)
at java.lang.Class.newInstance(Class.java:308)
at org.restlet.engine.Engine.registerHelper(Engine.java:718)
at org.restlet.engine.Engine.registerHelpers(Engine.java:753)
at org.restlet.engine.Engine.registerHelpers(Engine.java:793)
at org.restlet.engine.Engine.discoverConverters(Engine.java:501)
at org.restlet.engine.Engine.<init>(Engine.java:337)
at org.restlet.engine.Engine.register(Engine.java:248)
at org.restlet.engine.Engine.register(Engine.java:237)
at org.restlet.engine.Engine.getInstance(Engine.java:149)
at org.restlet.engine.Engine.getLogger(Engine.java:204)
at org.restlet.Context.<init>(Context.java:160)
at org.restlet.Context.<init>(Context.java:133)
at org.restlet.ext.servlet.ServerServlet.createComponent(ServerServlet.java:422)
at org.restlet.ext.servlet.ServerServlet.getComponent(ServerServlet.java:763)
at org.restlet.ext.servlet.ServerServlet.init(ServerServlet.java:881)
at javax.servlet.GenericServlet.init(GenericServlet.java:242)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1428)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1060)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:187)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ClassNotFoundException: org.json.JSONException
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at org.glassfish.web.loader.WebappClassLoader.findClass(WebappClassLoader.java:959)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1430)
... 45 more
以下罐子是我的類路徑和WEB-INF/lib目錄文件夾:
org.json.jar
org.restlet.jar
org.restlet.ext.servlet
org.restlet.ext.json
我正在使用Eclipse構建項目並部署在Glassfish上。 web.xml等都很好,沒有部署錯誤...但是,這個讓我撓了一陣頭腦。
任何想法?
哦,我發現爲什麼在我的情況下:該jar包含一個名爲org.restlet.engine.converter.ConverterHelper的文件的META-INF/services文件夾。這就是發現的工作原理 – ZiglioUK 2014-02-12 01:07:24