无法调用REST 1.1服务与JAXRS-2.0功能启用

Question

我使用自由轮廓16上的Java 1.8启用了以下特点：

<featureManager> 
     <feature>jsp-2.3</feature> 
     <feature>wasJmsServer-1.0</feature> 
     <feature>wasJmsClient-2.0</feature> 
     <feature>jndi-1.0</feature> 
     <feature>ejbLite-3.2</feature> 
     <feature>servlet-3.1</feature> 
     <feature>jdbc-4.0</feature> 
     <feature>localConnector-1.0</feature> 
     <feature>jaxrs-2.0</feature> 
    </featureManager> 

我使用Apache的表情在这我休息提供商并将其添加作为第三方图书馆。

<library id="winkLib" > 
     <fileset dir="E:\Software\Jars\wink1.4\apache-wink-1.4\lib" includes="*.jar" scanInterval="5s"></fileset> 
    </library> 

    <enterpriseApplication location="E:\wlp9\usr\servers\servername\apps\myear.ear"> 
     <classloader commonLibraryRef="winkLib" /> 
    </enterpriseApplication> 

的REST服务越来越成功注册，但是当我试图访问我收到以下错误的服务：

10:43:04,241 INFO [User=] [RequestInterceptor] Initializing Request Hanlder 
10:43:04,256 INFO [User=] [ResponseInterceptor] Initializing response interceptor 
[INFO ] The following error occurred during the invocation of the handlers chain: NullPointerException with message 'null' while processing POST request sent to http://localhost:8081/myapp/rest/login 
10:43:04,287 WARN [User=] [RestExceptionHandler] Exception Hanlder Invoked 
10:43:04,287 ERROR [User=] [RestExceptionHandler] 
**************************************************************************************************** 
Message Info:java.lang.NullPointerException 

**************************************************************************************************** 
[ERROR ] The system cannot determine the class of type null. 
[ERROR ] An unhandled exception occurred which will be propagated to the container. 
java.lang.NullPointerException 
[ERROR ] SRVE0777E: Exception thrown by application class 'java.lang.Class.isAssignableFrom:-2' 
java.lang.NullPointerException 
    at java.lang.Class.isAssignableFrom(Native Method) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry$MediaTypeMap$OFHolder.compareTo(ProvidersRegistry.java:1008) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry$MediaTypeMap$OFHolder.compareTo(ProvidersRegistry.java:906) 
    at java.util.Collections$ReverseComparator.compare(Collections.java:5117) 
    at java.util.Collections$ReverseComparator.compare(Collections.java:5108) 
    at java.util.TreeMap.put(TreeMap.java:552) 
    at java.util.TreeSet.add(TreeSet.java:255) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry$MediaTypeMap.internalGetProvidersByMediaType(ProvidersRegistry.java:752) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry$MediaTypeMap.getProvidersByMediaType(ProvidersRegistry.java:711) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry.getMessageBodyWriter(ProvidersRegistry.java:445) 
    at org.apache.wink.common.internal.contexts.ProvidersImpl.getMessageBodyWriter(ProvidersImpl.java:72) 
    at org.apache.wink.server.internal.handlers.FlushResultHandler.handleResponse(FlushResultHandler.java:144) 
    at org.apache.wink.server.handlers.AbstractHandler.handleResponse(AbstractHandler.java:38) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.handlers.AbstractHandler.handleResponse(AbstractHandler.java:39) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.handlers.AbstractHandler.handleResponse(AbstractHandler.java:39) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.handlers.AbstractHandler.handleResponse(AbstractHandler.java:39) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.internal.log.Responses.handleResponse(Responses.java:90) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.run(AbstractHandlersChain.java:60) 
    at org.apache.wink.server.internal.RequestProcessor.handleRequestWithoutFaultBarrier(RequestProcessor.java:232) 
    at org.apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:154) 
    at org.apache.wink.server.internal.servlet.RestServlet.service(RestServlet.java:124) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
    at [internal classes] 

[INFO ] FFDC1015I: An FFDC Incident has been created: "java.lang.NullPointerException com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters 1105" at ffdc_17.03.09_10.43.04.0.log 
[ERROR ] SRVE0315E: An exception occurred: java.lang.Throwable: java.lang.NullPointerException 
    at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:4983) 
    at [internal classes] 
Caused by: java.lang.NullPointerException 
    at java.lang.Class.isAssignableFrom(Native Method) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry$MediaTypeMap$OFHolder.compareTo(ProvidersRegistry.java:1008) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry$MediaTypeMap$OFHolder.compareTo(ProvidersRegistry.java:906) 
    at java.util.Collections$ReverseComparator.compare(Collections.java:5117) 
    at java.util.Collections$ReverseComparator.compare(Collections.java:5108) 
    at java.util.TreeMap.put(TreeMap.java:552) 
    at java.util.TreeSet.add(TreeSet.java:255) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry$MediaTypeMap.internalGetProvidersByMediaType(ProvidersRegistry.java:752) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry$MediaTypeMap.getProvidersByMediaType(ProvidersRegistry.java:711) 
    at org.apache.wink.common.internal.registry.ProvidersRegistry.getMessageBodyWriter(ProvidersRegistry.java:445) 
    at org.apache.wink.common.internal.contexts.ProvidersImpl.getMessageBodyWriter(ProvidersImpl.java:72) 
    at org.apache.wink.server.internal.handlers.FlushResultHandler.handleResponse(FlushResultHandler.java:144) 
    at org.apache.wink.server.handlers.AbstractHandler.handleResponse(AbstractHandler.java:38) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.handlers.AbstractHandler.handleResponse(AbstractHandler.java:39) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.handlers.AbstractHandler.handleResponse(AbstractHandler.java:39) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.handlers.AbstractHandler.handleResponse(AbstractHandler.java:39) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.internal.log.Responses.handleResponse(Responses.java:90) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:26) 
    at org.apache.wink.server.handlers.ResponseHandlersChain.handle(ResponseHandlersChain.java:22) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75) 
    at org.apache.wink.server.handlers.AbstractHandlersChain.run(AbstractHandlersChain.java:60) 
    at org.apache.wink.server.internal.RequestProcessor.handleRequestWithoutFaultBarrier(RequestProcessor.java:232) 
    at org.apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:154) 
    at org.apache.wink.server.internal.servlet.RestServlet.service(RestServlet.java:124) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
    ... 1 more 

，这是我的web.xml的样子：

<servlet> 
     <servlet-name>JAX-RS Servlet</servlet-name> 
     <servlet-class>org.apache.wink.server.internal.servlet.RestServlet</servlet-class> 
     <init-param> 
      <param-name>javax.ws.rs.Application</param-name> 
      <param-value>package.name.RestfulResourceLoader</param-value> 
     </init-param> 
     <init-param> 
     <param-name>propertiesLocation</param-name> 
     <param-value>handler.properties</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
    </servlet> 

    <servlet-mapping> 
     <servlet-name>JAX-RS Servlet</servlet-name> 
     <url-pattern>/rest/*</url-pattern> 
    </servlet-mapping> 

Answer 1

这看起来像眨眼中的一个错误。尽管共享库建议您使用Wink 1.4，但堆栈跟踪中的源代码行号与Wink 1.2.1更接近。也许这个问题在更新版本的Wink中得到了解决。

由于您使用的是jaxrs-2.0功能（该功能告诉Liberty服务器使JAX-RS 2.0 API软件包可用于应用程序），但试图使用不同的JAX -RS提供商。这里还有一个版本冲突 - Wink实现了JAX-RS 1.1。如果我正确理解这个配置，您将使用Wink作为JAX-RS提供程序，但使用Liberty附带的JAX-RS 2.0 API。即使这不是你所看到的问题的原因，它很可能会在稍后导致问题。

如果你想使用Wink，我会建议从你的应用程序中删除它，然后使用jaxrs-1.1功能（而不是jaxrs-2.0功能）。 Liberty的jaxrs-1.1。实现是Wink，它使许多Wink特定的API可用。

如果您只需要一个JAX-RS提供程序（没有Wink特定的），那么我会建议从您的应用程序中删除Wink库，并使用内置于jaxrs-2.0功能的CXF实现。这需要制作一些changes to the web.xml。

希望这有助于安迪