线程"main"中的异常java.lang.NoClassDefFoundError:无法初始化类com.sun.jersey.core.header.MediaTypes

Question

我正试图经营一个球衣客户并面对这个问题.

WS类:

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

@Path("/hello")
public class HelloWorldService {

@GET
@Path("/vip")
@Produces(MediaType.APPLICATION_JSON)
public Response getMsg(@QueryParam("msg") String msg) {

    String output = "Jersey say : " + msg;

    return Response.status(200).entity(output).build();

}

}

客户类:

    import com.sun.jersey.api.client.Client;
    import com.sun.jersey.api.client.ClientResponse;
    import com.sun.jersey.api.client.WebResource;

    public class JerseyClientGet {

        public static void main(String[] args) {
            try {

                Client client = Client.create();

                WebResource webResource = client
                        .resource("http://localhost:8080/TestRest/rest/hello/vip?msg=ABCD");

                ClientResponse response = webResource.accept("application/json")
                        .get(ClientResponse.class);

                if (response.getStatus() != 200) {
                    throw new RuntimeException("Failed : HTTP error code : "
                            + response.getStatus());
                }

                String output = response.getEntity(String.class);

                System.out.println("Output from Server .... \n");
                System.out.println(output);

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

    }

问题是当我尝试执行客户端类时,会出现以下错误消息

            Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class com.sun.jersey.core.header.MediaTypes
                at com.sun.jersey.core.spi.factory.MessageBodyFactory.initReaders(MessageBodyFactory.java:182)
                at com.sun.jersey.core.spi.factory.MessageBodyFactory.initReaders(MessageBodyFactory.java:176)
                at com.sun.jersey.core.spi.factory.MessageBodyFactory.init(MessageBodyFactory.java:162)
                at com.sun.jersey.api.client.Client.init(Client.java:342)
                at com.sun.jersey.api.client.Client.access$000(Client.java:118)
                at com.sun.jersey.api.client.Client$1.f(Client.java:191)
                at com.sun.jersey.api.client.Client$1.f(Client.java:187)
                at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
                at com.sun.jersey.api.client.Client.<init>(Client.java:187)
                at com.sun.jersey.api.client.Client.<init>(Client.java:159)
                at com.sun.jersey.api.client.Client.create(Client.java:669)
                at com.mkyong.client.JerseyClientGet.main(JerseyClientGet.java:12)

我正在使用以下罐子:

asm-3.1.jar,jackson-core-asl-1.9.2.jar,jackson-jaxrs-1.9.2.jar,jackson-mapper-asl-1.9.2.jar,jackson-xc-1.9.2.jar, jersey-bundle-1.8.jar,jersey-client-1.18.jar,jersey-core-1.18.jar,jersey-json-1.18.jar,jersey-server-1.18.jar,jersey-servlet-1.18.jar,jettison- 1.1.jar,jsr311-api-1.1.1.jar

Answer 1

通常,当您的代码针对jersey-bundle-1.8.jar和jsr311-api-0.9.jar编译时,您会遇到此问题.但在这里我可以看到你正在使用jsr311-api-1.1.1.jar.然后下一个问题是应用程序/ Web服务器将加载旧的jar文件.例如:GlassFish 3.1一个带有Jersy 1.5(可能优先于你的库).

理想情况下,您需要检查服务器中加载的JSR-311库的版本(jsr311-api jar的0.9版本已过时).你应该针对jersey-bundle-1.8.jar进行编译,并使用jersey-bundle-1.8.jar和jsr311-api-1.1.1.jar运行