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java.lang.NoClassDefFoundError：在Rest API JAVA中

[英]java.lang.NoClassDefFoundError: In Rest API JAVA

 原文  2013-08-13 10:28:17  0   2    java/ rest

問題描述

我正在Eclipse中的另一個Rest API Project2中使用project1的類。 我已經添加了該project1來休息api project2的構建路徑，但仍然出現此異常：

我使用的代碼： 

@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();
            }
        }
    }

例外： 

<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 個解決方案

解決方案1
 1  2013-08-13 13:09:32

問題已解決，我們必須將項目添加到屬性->部署程序集->添加->項目

解決方案2
 0  2013-08-13 10:35:49

將一個項目添加到另一個項目將僅對編譯有幫助，而對執行無濟於事。 您需要具有相關類，也許打包為jar，然后將它們放在webapp或服務器lib目錄中。 確保部署了應用程序的Web容器能夠找到這些類，簡而言之，這些類應該位於類路徑上。

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