title: java.lang.ClassNotFoundException: org.codehaus.jackson.map.JsonSerializableWithType
body: <p>I got Jackson 2.2.3 in my buildpath but i still get this error. anyone know why? </p>
  
  <p><img src="https://i.stack.imgur.com/8xuhG.jpg" alt="enter image description here"></p>
  
  <pre><code>com.sun.jersey.core.spi.component.ProviderFactory __getComponentProvider: The provider class, class com.sun.jersey.json.impl.provider.entity.JSONWithPaddingProvider, could not be instantiated. Processing will continue but the class will not be utilized
  java.lang.SecurityException: Unable to get members for class com.sun.jersey.json.impl.provider.entity.JSONWithPaddingProvider
      at com.google.appengine.runtime.Request.process-244548b7ddf4520b(Request.java)
      at java.lang.Class.getDeclaredMethods(Class.java:256)
      at com.sun.jersey.core.reflection.MethodList.getAllDeclaredMethods(MethodList.java:70)
      at com.sun.jersey.core.reflection.MethodList.&lt;init&gt;(MethodList.java:64)
      at com.sun.jersey.core.spi.component.ComponentConstructor.getPostConstructMethods(ComponentConstructor.java:131)
      at com.sun.jersey.core.spi.component.ComponentConstructor.&lt;init&gt;(ComponentConstructor.java:123)
      at com.sun.jersey.core.spi.component.ProviderFactory.__getComponentProvider(ProviderFactory.java:165)
      at com.sun.jersey.core.spi.component.ProviderFactory.getComponentProvider(ProviderFactory.java:137)
      at com.sun.jersey.core.spi.component.ProviderServices.getComponent(ProviderServices.java:256)
      at com.sun.jersey.core.spi.component.ProviderServices.getServices(ProviderServices.java:160)
      at com.sun.jersey.core.spi.factory.MessageBodyFactory.initWriters(MessageBodyFactory.java:207)
      at com.sun.jersey.core.spi.factory.MessageBodyFactory.init(MessageBodyFactory.java:163)
      at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1277)
      at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:169)
      at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:775)
      at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:771)
      at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
      at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
      at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
      at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
      at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
      at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
      at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
      at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
      at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
      at javax.servlet.GenericServlet.init(GenericServlet.java:212)
      at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
      at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)
      at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
      at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
      at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
      at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:435)
      at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:442)
      at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:186)
      at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:306)
      at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:298)
      at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:439)
      at java.lang.Thread.run(Thread.java:722)
  Caused by: java.lang.reflect.InvocationTargetException
      at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:601)
      ... 41 more
  Caused by: java.lang.NoClassDefFoundError: org/codehaus/jackson/map/JsonSerializableWithType
      at com.google.appengine.runtime.Request.process-244548b7ddf4520b(Request.java)
      at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:794)
      at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
      at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
      at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
      ... 43 more
  Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.map.JsonSerializableWithType
      at com.google.appengine.runtime.Request.process-244548b7ddf4520b(Request.java)
      ... 41 more
  </code></pre>