泽西岛500错误NoClassDefFoundError：org / json / JSONException

Question

在将其标记为DUPLICATE之前，请理解我已经检查了所有相关链接，但无济于事。

我正在致电以下服务。

@Path("/courses")
public class CourseService {

//  @GET
//  @Produces(MediaType.TEXT_PLAIN)
//  public String hello(){
//      return "Hello World !!!";
//  }

    private DataService _service;

    public CourseService(String jsonData) throws ParseException, IOException, JSONException {
        _service = new DataService(jsonData);
    }

    @GET
    @Produces(MediaType.APPLICATION_XML)
    public ArrayList<Course> getAllCourses(){
        return _service.get_handler().getAllCourses();

    }
}

如果我只运行代码的注释部分，我的应用程序将运行良好并生成“ Hello World”

但是，当我运行我的实际服务时，它给了我以下错误。

type Exception report

message Servlet.init() for servlet Jersey Web Application threw exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet Jersey Web Application threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)
root cause

java.lang.NoClassDefFoundError: org/json/JSONException
    java.lang.Class.getDeclaredConstructors0(Native Method)
    java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
    java.lang.Class.getConstructors(Class.java:1651)
    org.glassfish.jersey.server.model.MethodHandler$ClassBasedMethodHandler.<init>(MethodHandler.java:265)
    org.glassfish.jersey.server.model.MethodHandler.create(MethodHandler.java:155)
    org.glassfish.jersey.server.model.ResourceMethod$Builder.createInvocable(ResourceMethod.java:550)
    org.glassfish.jersey.server.model.ResourceMethod$Builder.build(ResourceMethod.java:536)
    org.glassfish.jersey.server.model.Resource$Builder.processMethodBuilders(Resource.java:663)
    org.glassfish.jersey.server.model.Resource$Builder.buildResourceData(Resource.java:599)
    org.glassfish.jersey.server.model.Resource$Builder.build(Resource.java:655)
    org.glassfish.jersey.server.model.Resource.from(Resource.java:798)
    org.glassfish.jersey.server.ApplicationHandler.initialize(ApplicationHandler.java:465)
    org.glassfish.jersey.server.ApplicationHandler.access$500(ApplicationHandler.java:184)
    org.glassfish.jersey.server.ApplicationHandler$3.call(ApplicationHandler.java:350)
    org.glassfish.jersey.server.ApplicationHandler$3.call(ApplicationHandler.java:347)
    org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    org.glassfish.jersey.internal.Errors.processWithException(Errors.java:255)
    org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:347)
    org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:392)
    org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:177)
    org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:369)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)

这是我的项目目录的结构

我已经使用TestClient测试了CourseService，并且效果很好。 我究竟做错了什么。

Answer 1

您不应该像这样定义依赖项。 应该使用诸如maven或gradle之类的东西来管理所有依赖项。 话虽这么说，您是否将jar添加到类路径中？

由于您使用的是maven，因此您希望将其添加到<dependencies>部分。 例如：

<dependencies>
    <!-- other dependencies -->
    <dependency>
        <groupId>org.json</groupId>
        <artifactId>json</artifactId>
        <!-- or w.e. version you wanted to use. -->
        <!-- See http://mvnrepository.com/artifact/org.json/json-->
        <version>20160212</version> 
     </dependency>
     <!-- other dependencies -->
</dependencies>

Eclipse应该自动将类似上面的依赖项添加到类路径中。

查看有关Maven的官方教程之一： https : //maven.apache.org/guides/getting-started/maven-in-five-minutes.html

Answer 2

java.lang.NoClassDefFoundError：org / json / JSONException

请确保定义了JSONException并且可以访问。