I'm re-asking an unanswered question from the now read-only google groups App Engine for Java because I have the exact same problem. (original)
我重新问了一个关于Java的只读谷歌组应用程序引擎的问题，因为我也有同样的问题。(原始)
I have put together a simple json REST service using jersey, jaxb and jackson. It works almost fine, however the first request to the server always ends up with the exception: java.lang.NoClassDefFoundError: org/codehaus/jackson/xc/JaxbAnnotationIntrospector
我使用jersey、jaxb和jackson组装了一个简单的json REST服务。它几乎可以正常工作，但是对服务器的第一个请求总是以异常结束:java.lang。NoClassDefFoundError:org/codehaus/jackson/xc/JaxbAnnotationIntrospector
For some reason gae/jersey cannot find this class on the initial request. However, all subsequent requests after this work fine, the class then seems to have been loaded.
由于某些原因，gae/jersey无法在初始请求中找到此类。然而，所有后续的请求在此工作完成后，类似乎已经被加载。
For additional info:
附加信息:
I'm sending json to the server - in chrome's inspector I can see:
我将json发送到服务器——在chrome的检查器中，我可以看到:
Content-Type:application/json;charset=UTF-8
Request Payload {"stuff":["a","b"],"number":"10"}
and the relevant resource signature looks like this:
相关资源签名如下:
@POST
@Consumes({MediaType.APPLICATION_JSON})
public void run(Params params){};
Any help very gratefully received!
非常感谢您的帮助!
EDIT: Here's the full stack trace
编辑:这是完整的堆栈跟踪。
WARNING: Error for /backtest
java.lang.NoClassDefFoundError: org/codehaus/jackson/xc/JaxbAnnotationIntrospector
at org.codehaus.jackson.jaxrs.MapperConfigurator._resolveIntrospector(MapperConfigurator.java:169)
at org.codehaus.jackson.jaxrs.MapperConfigurator._resolveIntrospectors(MapperConfigurator.java:144)
at org.codehaus.jackson.jaxrs.MapperConfigurator._setAnnotations(MapperConfigurator.java:131)
at org.codehaus.jackson.jaxrs.MapperConfigurator.getDefaultMapper(MapperConfigurator.java:70)
at org.codehaus.jackson.jaxrs.JacksonJsonProvider.locateMapper(JacksonJsonProvider.java:609)
at org.codehaus.jackson.jaxrs.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:404)
at com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy.readFrom(JacksonProviderProxy.java:139)
at com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:474)
at com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$EntityInjectable.getValue(EntityParamDispatchProvider.java:123)
at com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:46)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$VoidOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:166)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1483)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1414)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1363)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1353)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:414)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:895)
at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:843)
at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:804)
at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:168)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:369)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.xc.JaxbAnnotationIntrospector
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 java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 60 more
1 个解决方案
#1
13
From what I can tell you most likely don't have the optional XC Jackson lib.
根据我所能告诉你的，很可能没有可选的XC Jackson lib。
The XC package allows you to use Xml Annotations (JAXB) in addition to the Jackson Annotations for mapping classes.
XC包允许您在映射类的Jackson注释之外使用Xml注释(JAXB)。
From what I can tell this error will only happen once during Jackson first setup so unless you need JAXB support just ignore the issue.
据我所知，这个错误只会在Jackson第一次安装时发生一次，所以除非需要JAXB支持，否则忽略这个问题。
#1
13
From what I can tell you most likely don't have the optional XC Jackson lib.
根据我所能告诉你的，很可能没有可选的XC Jackson lib。
The XC package allows you to use Xml Annotations (JAXB) in addition to the Jackson Annotations for mapping classes.
XC包允许您在映射类的Jackson注释之外使用Xml注释(JAXB)。
From what I can tell this error will only happen once during Jackson first setup so unless you need JAXB support just ignore the issue.
据我所知，这个错误只会在Jackson第一次安装时发生一次，所以除非需要JAXB支持，否则忽略这个问题。