Java RestFull WebService：使用Jersey 2.3.1库的JAX-RS实现 [英] Java RestFull WebService: JAX-RS implementation with Jersey 2.3.1 libraries

问题描述

我正在尝试在JBoss jboss-eap-6.1 AS上运行一个简单的Hallo World应用程序Jersey 2.3.1 REST服务。在web.xml中我禁用了restEasy库。在部署期间，我收到错误：

I am trying to run a simple "Hallo World" application Jersey 2.3.1 REST service on JBoss jboss-eap-6.1 AS. In web.xml i have disabled restEasy library. During deployment i am getting the error:

JBWEB000289：Servlet
com.sun.jersey.samples.helloworld.resources.MyApplication抛出load（）
异常：java.lang.NoSuchMethodError：
javax.ws.rs.core.Application.getProperties（）Ljava / util / Map;

JBWEB000289: Servlet com.sun.jersey.samples.helloworld.resources.MyApplication threw load() exception: java.lang.NoSuchMethodError: javax.ws.rs.core.Application.getProperties()Ljava/util/Map;

在POM中我放了这些依赖项：

In POM i put these dependencies:

<dependency>
    <groupId>org.glassfish.jersey.core</groupId>
    <artifactId>jersey-server</artifactId>
    <version>2.3.1</version>
</dependency>
<dependency>
    <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-servlet-core</artifactId>
    <version>2.3.1</version>
</dependency>
<dependency>
    <groupId>javax.ws.rs</groupId>
    <artifactId>javax.ws.rs-api</artifactId>
    <version>2.0</version>
</dependency>

这是我的web.xml，其中restEasy标签禁用：

This is my web.xml with restEasy tags disabling:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <servlet>
        <servlet-name>com.sun.jersey.samples.helloworld.resources.MyApplication</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>javax.ws.rs.Application</param-name>
            <param-value>com.sun.jersey.samples.helloworld.resources.MyApplication</param-value>
        </init-param>
           <load-on-startup>1</load-on-startup>
    </servlet>
    <context-param>
        <param-name>resteasy.scan</param-name>
        <param-value>false</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.scan.providers</param-name>
        <param-value>false</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.scan.resources</param-name>
        <param-value>false</param-value>
    </context-param>
    <servlet-mapping>
        <servlet-name>com.sun.jersey.samples.helloworld.resources.MyApplication</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

我的资源配置java类：

And my resource config java class:

package com.sun.jersey.samples.helloworld.resources;
import org.glassfish.jersey.server.ResourceConfig;
public class MyApplication extends  ResourceConfig {   

     public MyApplication() {
            packages("com.sun.jersey.samples.helloworld.resources");
          //super(HelloWorldResource.class);

     }
}

有人有任何想法解决它？
提前感谢，
Roberto

Someone have any idea to solve it? thanks in advance, Roberto

推荐答案

NoSuchMethodError 通常意味着您在类路径上有两个不同版本的类。由于 javax.ws.rs.core.Application 类在其JAX-RS中具有 getProperties（）方法2版本，但不是在JAX-RS 1.x中，我猜你会把旧的1.x Jersey（或旧的REST api）与当前的（2.3.1）结合起来。

NoSuchMethodError usually means you are having two different versions of the class on your classpath. As the javax.ws.rs.core.Application class does have the getProperties() method in its JAX-RS 2 version, but not in JAX-RS 1.x, I would guess that somehow you are combining the old 1.x Jersey (or old REST api) with the current (2.3.1) one.

您正在使用的套餐（ com.sun.jersey - '旧'泽西套餐）点有点朝这个方向发展（虽然只是将你的代码放入该包中本身不会引起上述问题），你显然是以Jersey 1.x为例开始的（在Jersey 2中也有样本，见helloworld-webapp 。

Also the package you are working in (com.sun.jersey - the 'old' Jersey package) points a bit towards this direction (although just placing your code into that package itself cannot cause the mentioned problem), you obviously started with the Jersey 1.x example as a base (there are samples in Jersey 2 as well, see helloworld-webapp on Jersey GitHub).

是否有可能，restEasy（也肯定包含 javax.ws.rs.core.Application 类）未完全关闭，并以某种方式默认为JAX-RS 1。 x版本？

Is it possible, that restEasy (also definitely containing the javax.ws.rs.core.Application class) is not completely switched off and somehow defaults to JAX-RS 1.x version?

我首先检查你的pom文件，查看有效的pom（如果你的项目描述符有一些父级）并仔细检查你的类路径上的内容 - 我相信某处有一个1.x版本的 javax.ws.rs-api 。还尝试清理所有已编译的东西并从头开始重建。

I would start with inspecting your pom file, look at the effective pom (if your project descriptor has some parent) and check carefully what is on your classpath - I believe there is a 1.x version of javax.ws.rs-api somewhere. Also try to clean all the compiled stuff and rebuild from scratch.

说到依赖关系，如果你的列表是详尽的（关于Jersey），你很可能必须添加 jersey-common （2.3.1）依赖，就像在初始化期间一样， ResourceConfig.packages（）方法调用 PackageScanner 构造函数，其中包含对 ReflectionHelper 的调用 - 而且这不再是服务器jar的一部分。

Speaking of dependencies, if your list is exhaustive (regarding Jersey), you will most likely have to add jersey-common (2.3.1) dependency, as already during the initialization, the ResourceConfig.packages() method calls the PackageScanner constructor, which contains call to ReflectionHelper - and this is not a part of the server jar any more.

希望这会有所帮助。

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