那些遇到过的问题

球衣+ Spark javax.ws.rs.core.UriBuilder.uri

Neb*_*ras 3 java rest spring jersey-2.0 apache-spark

我正在使用Jersey 2 + spring开发Restful服务。在同一项目中，我依赖于Spark 2.0.11。但是，一旦将spark依赖项添加到项目中，则在调用Restful服务时会引发以下异常。例外：

SEVERE: Servlet.service() for servlet [jersey-serlvet] in context with path [/recommender] threw exception [Servlet execution threw an exception] with root cause
java.lang.AbstractMethodError: javax.ws.rs.core.UriBuilder.uri(Ljava/lang/String;)Ljavax/ws/rs/core/UriBuilder;
    at javax.ws.rs.core.UriBuilder.fromUri(UriBuilder.java:119)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:298)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:958)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
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pom.xml：

<properties>
    <org.springframework-version>4.0.0.RELEASE</org.springframework-version>
    <jersey2.version>2.19</jersey2.version>
    <jaxrs.version>2.0.1</jaxrs.version>
  </properties>
<dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-core_2.11</artifactId>
        <version>2.0.0</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-mllib_2.10 -->
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-mllib_2.11</artifactId>
        <version>2.0.0</version>
    </dependency>

  <!-- JAX-RS -->
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>${jaxrs.version}</version>
        </dependency>
        <!-- Jersey 2.19 -->
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>${jersey2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-server</artifactId>
            <version>${jersey2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-client</artifactId>
            <version>${jersey2.version}</version>
        </dependency>
    <dependency>
      <groupId>io.swagger</groupId>
      <artifactId>swagger-jersey-jaxrs</artifactId>
      <version>1.5.0</version>
      <!-- <exclusions>
        <exclusion>
            <artifactId>jersey-multipart</artifactId>
            <groupId>com.sun.jersey.contribs</groupId>
        </exclusion>
      </exclusions> -->
    </dependency>

    <!-- spring -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>



    <!-- jersey + spring -->
    <dependency>
        <groupId>com.sun.jersey.contribs</groupId>
        <artifactId>jersey-spring</artifactId>
        <version>1.9</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.springframework</groupId>
                <artifactId>spring-context</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring-asm</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
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web.xml 

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
    id="WebApp_ID" version="2.5">
    <display-name>WebApp</display-name>

    <!-- <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param> -->

    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>

    <servlet>
        <servlet-name>jersey-serlvet</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
             <param-name>jersey.config.server.provider.packages</param-name>
             <param-value>com.company.recommender.rest.v1</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet>
        <servlet-name>Jersey2Config</servlet-name>
        <servlet-class>io.swagger.jaxrs.config.DefaultJaxrsConfig</servlet-class>
        <init-param>
            <param-name>api.version</param-name>
            <param-value>1.0.0</param-value>
        </init-param>
        <init-param>
            <param-name>swagger.api.basepath</param-name>
            <param-value>http://localhost:8085/recommender/rest/v1</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>jersey-serlvet</servlet-name>
        <url-pattern>/rest/v1/*</url-pattern>
    </servlet-mapping> 

</web-app>
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我知道问题是UriBuilder类的冲突定义（可以在许多包含的库中找到）。所以有任何建议。

yug*_*har 7

实际上，Spark 2.0带来了jersey 2.x

[INFO] |  +- org.glassfish.jersey.core:jersey-client:jar:2.22.2:compile
[INFO] |  |  +- javax.ws.rs:javax.ws.rs-api:jar:2.0.1:compile
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当jersey-spring引入jersey 1.x时，两者都有一些通用的类，但是实现方式不同。

现在，让我们看一下错误

java.lang.AbstractMethodError: javax.ws.rs.core.UriBuilder.uri(Ljava/lang/String;)Ljavax/ws/rs/core/UriBuilder;
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因此，它说它遇到了UriBuilder例如抽象方法。通常，Java编译器不允许使用抽象类（具有抽象方法）创建实例。因此，您可以清楚地得出结论，在编译时和运行时使用的类是不同的。让我们看一下如何在运行时更改类，看一下javax.ws.rs.core.UriBuilder.fromUri方法trace 的源代码：

public static UriBuilder fromUri(URI uri) {
    return newInstance().uri(uri);
}
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要求 

protected static UriBuilder newInstance() {
        return RuntimeDelegate.getInstance().createUriBuilder();
}
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使用以下方法解决：

public static RuntimeDelegate getInstance() {

        RuntimeDelegate result = cachedDelegate;
        if (result == null) { // First check (no locking)
            synchronized (RD_LOCK) {
                result = cachedDelegate;
                if (result == null) { // Second check (with locking)
                    cachedDelegate = result = findDelegate();
                }
            }
        }
        return result;
    }
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它正在调用RuntimeDelegate.findDelegate()，它将创建RuntimeDelegate的实现，然后将其用于创建UriBuilder。由于类路径在运行时不匹配，因此将其解析为com.sun.jersey.api.uri.UriBuilderImpl（从jersey 1开始），该类没有抽象方法的实现public abstract UriBuilder uri(String uriTemplate);（因为它是从2.0版引入的）。为了避免我只是做了

    RuntimeDelegate.setInstance(new org.glassfish.jersey.internal.RuntimeDelegateImpl());
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在应用程序开始时。依次为org.glassfish.jersey.uri.internal.JerseyUriBuilder（非抽象类）创建适当的实现。它实际上是将名为静态成员cachedDelegate在RuntimeDelegate。

由于只是URI解析，因此可能会使用不同的库。给定的类与jersey 1和jersey 2完全兼容。如果有人为此找到任何其他lib，请告诉我。

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