Java 尝试创建新的ObjectMapper时出现NoClassDefFoundError错误

我是Java新手，正在尝试使用Jackson解析一些JSON数据。但是，我无法通过对象映射器的创建。在我的代码中，我有：

`import com.fasterxml.jackson.databind.ObjectMapper;

//其他代码 `ObjectMapper mapper=新的ObjectMapper//这是您在下面的错误中看到的第46行

错误：

Sep 17, 2013 1:03:59 PM com.sun.jersey.server.impl.application.WebApplicationImpl mapMappableContainerException
SEVERE: The exception contained within MappableContainerException could not be mapped to a response, re-throwing to the HTTP container
java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper
    at adtrax.rrh.BrandResource.createBrand(BrandResource.java:46)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:175)
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:167)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:115)
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:75)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:115)
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:67)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:709)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:667)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:658)
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:324)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:425)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:604)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ObjectMapper
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    ... 35 more

我的构建路径中有jackson JAR，并已按顺序检查并导出

好吧，我没有声誉点可以包括图像。我有jackson-annotations-2.2.3.jar、jackson-core-2.2.3.jar和jackson-databind-2.2.3.jar

我认为问题很简单，但我就是看不出来。有人能帮忙吗

---

谢谢大家!

看起来Jackson没有问题，但是类路径。。。您尝试过完整部署吗？您能验证这些JAR是否包含在WEB-INF/lib中吗？Mena-我只是在Eclipse中运行它，并使用SoapUI调用它。这是我们正在创建的REST服务的一部分，我只是想首先让它在本地工作。Mabbas-JAR与我们使用和引用的所有其他JAR一起位于构建存储库中。我可以验证它们是否在那里，是否在构建路径中，是否按顺序检查并导出。如果我没有正确回答你的问题，请原谅我。我有很多关于Java/Eclipse/Spring等的知识需要学习。问题是我没有意识到除了构建路径之外，我还必须向部署程序集添加一些东西。这是我第一次使用Java服务。谢谢你的回复！