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java.lang.NoClassDefFoundError: In Rest API JAVA

 原文  2013-08-13 10:28:17  2   2    java/ rest

Question

I am Using a project1's class in another Rest API Project2 in Eclipse. I have added that project1 to rest api project2's Build Path Still I am getting this Exception:

Code I have Used : 

@Path("/studentreq/json")
    @Consumes({ MediaType.APPLICATION_JSON })
    @Produces({ MediaType.APPLICATION_JSON })
    public Response requestBasicReport(Student stu) {
        OperationResult operationResult = new OperationResult();
        boolean responseFlag = false;
        try {
            if (operationResult.isSuccessful()) {
                responseFlag = true;
            } else {
                responseFlag = false;
                // send a message
            }
        } catch (Exception ex) {
            responseFlag = false;
        } finally {
            // nullify objects
            if (responseFlag) {
                return Response.ok(stu).build(); //put the required object in ok(object)
            } else {
                return Response.serverError().build();
            }
        }
    }

Exception: 

<html><head><title>Apache Tomcat/7.0.40 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - java.lang.NoClassDefFoundError: org/project/common/OperationResult</h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u>java.lang.NoClassDefFoundError: org/project/common/OperationResult</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/project/common/OperationResult
    com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:420)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
</pre></p><p><b>root cause</b> <pre>java.lang.NoClassDefFoundError: org/project/common/OperationResult
    org.project.basil.service.ReportRequest.requestBasicReport(ReportRequest.java:131)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
    com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
    com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
    com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
    com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
    com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
    com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
    com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
    com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
    com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
    com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

2 answers

solution1
 1  2013-08-13 13:09:32

问题已解决，我们必须将项目添加到属性->部署程序集->添加->项目

solution2
 0  2013-08-13 10:35:49

Adding one project to another project will help you just in the compilation but not in the exectuion. You need to have dependent class, maybe packaged as jar and then put them either in your webapp or your server lib directory. Make sure the web container where your application is deployed is able to find the classes, in short those should be on the classpath.

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