我的 java Restful Web 服务中的 java.lang.ClassNotFoundException : org. json.JSONObject

Question

我已经编写了java Restful Webservice来检索数据到JSON对象，但它有下面的错误

java.lang.NoClassDefFoundError: org/json/JSONObject
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2451)
    at java.lang.Class.privateGetPublicMethods(Class.java:2571)
    at java.lang.Class.getMethods(Class.java:1429)
    at com.sun.jersey.core.reflection.MethodList.getMethods(MethodList.java:77)
    at com.sun.jersey.core.reflection.MethodList.<init>(MethodList.java:64)
    at com.sun.jersey.core.reflection.MethodList.<init>(MethodList.java:60)
    at com.sun.jersey.server.impl.modelapi.annotation.IntrospectionModeller.createResource(IntrospectionModeller.java:116)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.getAbstractResource(WebApplicationImpl.java:739)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.createAbstractResourceModelStructures(WebApplicationImpl.java:1533)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1297)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:163)
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:769)
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:765)
    at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:765)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:760)
    at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:489)
    at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:319)
    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:374)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:557)
    at javax.servlet.GenericServlet.init(GenericServlet.java:212)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ClassNotFoundException: org.json.JSONObject
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
    ... 36 more

1? 03, 2018 2:55:37 ?? org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet HelloWorld Service
java.lang.ClassNotFoundException: org.json.JSONObject
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2451)
    at java.lang.Class.privateGetPublicMethods(Class.java:2571)
    at java.lang.Class.getMethods(Class.java:1429)
    at com.sun.jersey.core.reflection.MethodList.getMethods(MethodList.java:77)
    at com.sun.jersey.core.reflection.MethodList.<init>(MethodList.java:64)
    at com.sun.jersey.core.reflection.MethodList.<init>(MethodList.java:60)
    at com.sun.jersey.server.impl.modelapi.annotation.IntrospectionModeller.createResource(IntrospectionModeller.java:116)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.getAbstractResource(WebApplicationImpl.java:739)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.createAbstractResourceModelStructures(WebApplicationImpl.java:1533)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1297)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:163)
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:769)
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:765)
    at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:765)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:760)
    at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:489)
    at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:319)
    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:374)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:557)
    at javax.servlet.GenericServlet.init(GenericServlet.java:212)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Thread.java:722)

这是我的代码，但我已经编写了依赖项并在 eclipse 中设置了 jar

    @GET
    @Path("/{status}/status")
    @Consumes("application/json")
    @Produces("application/json")
    public JSONObject checkRefno(@PathParam("status") String status) {
        String ref_no = null;
        JSONObject json = new JSONObject();
         JSONArray array=new JSONArray();
        try {
            String conUrl = "the url cannot show to others"
            Class.forName("net.sourceforge.jtds.jdbc.Driver");
            Connection con = DriverManager.getConnection(conUrl);
            String sql = "SELECT orderid FROM dbo.abc WHERE status = ?";
            PreparedStatement ps = con.prepareStatement(sql);
            ps.setString(1, status);
            ResultSet rs = ps.executeQuery();
            if (rs.next()) {
                ref_no = rs.getString("ref_no");
            }
             array.put(ref_no);
             json.put("orderid", array);
            ps.close();
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return json;
    }

我该怎么办？我找到了一些答案，应该去部署程序集设置 jar，但我的 eclipse 找不到这个设置，任何人都可以帮助我，谢谢!

Answer 1

部署 java 动态 Web 项目时，应为构建路径设置 jar 文件，并将相同的 jar 文件添加到 WEB-INF 目录的 lib 文件夹中。

使用 buildpath 选项设置类路径:

将 jar 文件的副本添加到 lib 文件夹中: