Question

我写了一个与第三方服务通信的Jersey客户端，如果我从Eclipse运行它它可以工作但是如果我运行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'
}

以下是例外：

 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)

我从有完全相同问题的人那里读到this post，而他的解决方案是使用Maven，所以我也尝试使用Maven，但我得到了同样的例外。

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

有没有人知道为什么会这样？

Answer 1

正如@peeskillet建议的那样，使用 Maven Shade插件可以解决问题，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>

Answer 2

对于在gradle中寻找解决方案的人，请使用Shadow plugin。在build.gradle中添加以下行。

buildscript {
        repositories {
        maven {
            url "https://plugins.gradle.org/m2/"
        }
    }
    dependencies {
        classpath "com.github.jengelman.gradle.plugins:shadow:1.2.4"
    }
}
apply plugin: "com.github.johnrengelman.shadow"

shadowJar {
    baseName = '__Title__'
    mergeServiceFiles()    //For Merging Service Descriptor Files
}

Answer 3

+1啤酒到@peeskillet。与构建阴影jar的JMH性能基准的maven构建存在相同的问题。这是pom.xml的相关部分：

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.2</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <finalName>${uberjar.name}</finalName>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>org.openjdk.jmh.Main</mainClass>
                            </transformer>
                        </transformers>
                        <filters>
                            <filter>
                                <!-- Shading signed JARs will fail without this. http://stackoverflow.com/questions/999489/invalid-signature-file-when-attempting-to-run-a-jar -->
                                <artifact>*:*</artifact>
                                <excludes>
                                    <exclude>META-INF/*.SF</exclude>
                                    <exclude>META-INF/*.DSA</exclude>
                                    <exclude>META-INF/*.RSA</exclude>
                                </excludes>
                            </filter>
                        </filters>
                    </configuration>
                </execution>
            </executions>
        </plugin>

具有泽西依赖关系的Gradle jar会为media type = application / json找不到MessageBodyReader

3 个答案: