Spring 4 + jersey 集成@Autowired答案

【问题标题】：Spring 4 + jersey integration @AutowiredSpring 4 + jersey 集成@Autowired
【发布时间】：2015-01-06 23:25:09
【问题描述】：

我尝试了很多东西，但似乎我的球衣资源中的“搜索服务”会随机实例化自己。 SearchResource 中的 SearchService 几乎总是为空。

如你所见，我添加了 spring-jersey 依赖项。

这是我的代码： SearchResource（球衣，尝试实例化searchService）

@Path("search")
@Component
public class SearchResource {
    private static final Logger LOGGER = Logger.getLogger(SearchResource.class);
    @Context
    private UriInfo context;
    @Autowired
    private SearchService searchService;

    /**
     * Creates a new instance of SearchResource
     */
    public SearchResource() {
    }

    /**
     * Retrieves representation of an instance of com.gehc.mpse.backend.ws.SearchResource
     * @param search
     * @param <error>
     * @param authors
     * @return an instance of java.lang.String
     */
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response search(@QueryParam("query") String search, @QueryParam("authors") List<String> authors) {
        System.out.println("searchservice :" + searchService);
        Response res = searchService.searchQuery(search);
        return res;
    }

    public SearchService getSearchService() {
        return searchService;
    }

    public void setSearchService(SearchService searchService) {
        this.searchService = searchService;
    }

我的班级搜索服务：

@Component
public class SearchService {

    private static final Logger LOGGER = Logger.getLogger(SearchService.class);
    @Autowired
    private IPublicationRepository repository;
    @Autowired
    private Neo4jTemplate template;
    private static final Integer PAGE_SIZE = 20;

    public SearchService() {
        LOGGER.debug("search service initialzed " + this);
    }

    public Response searchQuery(String query) {

        PageRequest request
                = new PageRequest(1, PAGE_SIZE);
        LOGGER.debug("repo : " + repository);
        Page<Publication> res = repository.findPublicationByTitle(query, request);
        //repository.query(query, null);
        return Response.ok().entity(res.getContent()).build();
    }

    public IPublicationRepository getRepository() {
        return repository;
    }

    public void setRepository(IPublicationRepository repository) {
        this.repository = repository;
    }

    public Neo4jTemplate getTemplate() {
        return template;
    }

    public void setTemplate(Neo4jTemplate template) {
        this.template = template;
    }

}

我的 pom.xml

<dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
        <exclusions>
            <exclusion>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.version}</version>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-neo4j</artifactId>
        <version>3.2.0.RELEASE</version>
        <exclusions>
            <exclusion>
                <groupId>org.neo4j</groupId>
                <artifactId>neo4j</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.neo4j</groupId>
                <artifactId>neo4j-cypher</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.neo4j</groupId>
                <artifactId>neo4j-kernel</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <!-- Spring [End] -->
    <!--neo4j -->
    <dependency>
        <groupId>org.neo4j</groupId>
        <artifactId>neo4j</artifactId>
        <version>2.1.5</version>
    </dependency>
    <dependency>
        <groupId>org.neo4j.app</groupId>
        <artifactId>neo4j-server</artifactId>
        <version>2.1.5</version>
    </dependency>
    <!-- end neo4j -->
    <dependency>
        <groupId>org.glassfish.metro</groupId>
        <artifactId>webservices-rt</artifactId>
        <version>2.3</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>7.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.7</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.7</version>
    </dependency>

    <dependency>
        <groupId>org.apache.axis2</groupId>
        <artifactId>axis2</artifactId>
        <version>1.6.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.axis2</groupId>
        <artifactId>axis2-java2wsdl</artifactId>
        <version>1.6.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.ws.commons.axiom</groupId>
        <artifactId>axiom-api</artifactId>
        <version>1.2.14</version>
    </dependency>
    <dependency>
        <groupId>org.apache.ws.commons.axiom</groupId>
        <artifactId>axiom-impl</artifactId>
        <version>1.2.14</version>
    </dependency>
    <dependency>
        <groupId>org.reflections</groupId>
        <artifactId>reflections</artifactId>
        <version>0.9.9-RC1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.ext</groupId>
        <artifactId>jersey-spring3</artifactId>
        <version>2.13</version>
        <exclusions>
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
            </exclusion>            
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.glassfish.jersey.core</groupId>
                <artifactId>jersey-server</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.glassfish.jersey.containers</groupId>
                <artifactId>jersey-container-servlet-core</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.glassfish.hk2</groupId>
                <artifactId>hk2</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-jackson</artifactId>
        <version>2.13</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

我的 web.xml：

<web-app version="3.0" 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_3_0.xsd">

    <display-name>PMSE</display-name>
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <listener>
        <listener-class>
            org.springframework.web.context.request.RequestContextListener
        </listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:spring/context.xml</param-value>
    </context-param>
</web-app>

【问题讨论】：

标签： java spring rest maven spring-data-neo4j

【解决方案1】：

这是我的代码：SearchResource（球衣，尝试实例化 searchService）

请注意，Jersey 不会实例化您的 SearchService。因为资源上有@Component 注释，所以 SearchService 应该由 Spring 连接到 SearchResource，Jersey 应该从 Spring 检索 SearchResource 实例。

您的 Spring 上下文是否被创建了两次（一次由 Jersey，一次由 Spring 的 ContextLoaderListener）？在 Jersey 开始之前，Spring 上下文是 fully initialized 吗？ Jersey 查找 Spring 上下文，如果找不到，则尝试 create one on its own（第 98 行）。

Jersey 的 Spring 集成有些困难。最好的办法是在SpringComponentProvider 和AutowiredInjectResolver 中设置一些断点，然后在调试器中单步执行。调试时，您可以设置suspend=y，这样在您真正连接到调试器之前什么都不会发生。有关调试设置的更多详细信息，请参阅this answer。

我还会在 Jersey Jira 上查看 Spring related issues，看看是否有任何未解决的问题适用于您。

【讨论】：