java - 具有 jersey 依赖项的 Gradle jar 会生成 MessageBodyReader not found for media type=application/json

Question

我写了一个 Jersey 客户端，它与第 3 方服务通信，如果我从 Eclipse 运行它，它会工作，但如果我运行 jar，它会抛出 MessageBodyProviderNotFoundException文件。

我的build.gradle:

// Apply the java plugin to add support for Java
apply plugin: 'java'

version = '1.0'

// In this section you declare where to find the dependencies of your project
repositories {
    jcenter()
}

//create a single Jar with all dependencies
task createJar(type: Jar) {
    manifest {
        attributes 'Implementation-Title': 'MeteorDesk Whatsapp Images Parser',  
            'Implementation-Version': version,
            'Main-Class': 'controller.ImagesParser'
    }
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
    with jar
}

// In this section you declare the dependencies for your production and test code
dependencies {
    compile 'org.slf4j:slf4j-api:1.7.12'

    compile 'org.glassfish.jersey.core:jersey-client:2.22.1'
    compile 'org.glassfish.jersey.containers:jersey-container-servlet-core:2.22.1'
    compile 'org.glassfish.jersey.media:jersey-media-json-jackson:2.22.1'
    compile 'com.google.guava:guava:19.0'
    compile 'joda-time:joda-time:2.4'
}

异常(exception)情况:

 org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyReader not found for media type=application/json, type=class model.login.LoginResult, genericType=class model.login.LoginResult.
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:231)
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:155)
    at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1085)
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:874)
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:808)
    at org.glassfish.jersey.client.ClientResponse.readEntity(ClientResponse.java:326)
    at org.glassfish.jersey.client.InboundJaxrsResponse$1.call(InboundJaxrsResponse.java:115)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:419)
    at org.glassfish.jersey.client.InboundJaxrsResponse.runInScopeIfPossible(InboundJaxrsResponse.java:267)
    at org.glassfish.jersey.client.InboundJaxrsResponse.readEntity(InboundJaxrsResponse.java:112)
    at controller.MeteorDeskService.login(MeteorDeskService.java:42)

我读了this post来自有完全相同问题的人，他的解决方案是改用 Maven，所以我也尝试使用 Maven，但我遇到了同样的异常。

我还可以在生成的 jar 中看到 MessageBodyReader.class。

有人知道为什么会这样吗？

Answer 1

正如@peeskillet 所建议的，使用Maven Shade 插件 成功了，这就是我添加到我的pom.xml 中的内容:

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.4.3</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>your main class here</mainClass>
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>