Maven + Resteasy JAXB 找不到内容类型应用程序/xml 的编写器

Question

我想创建一个 .jar，用于其他项目，其中包括使用 ReastEasy 库（jaxb、jaxrs、jaxrs-clients 等）。

虽然我包含了所有库，并且在基于 maven 的项目中一切正常，但显然某些库不包含在 .jar 中，并且我在简单的 Java SE 项目中遇到以下异常，其中 .jar 仅包含在lib 文件夹：

RuntimeException: could not find writer for content-type application/xml type

.jar 是使用 Maven 和程序集插件 mvn clean compile assembly:single 构建的

以下是我pom.xml的相关部分

<dependencies>

    <dependency>
        <groupId>org.hibernate.javax.persistence</groupId>
        <artifactId>hibernate-jpa-2.0-api</artifactId>
        <version>1.0.1.Final</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>4.2.0.Final</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>5.0.3.Final</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-jaxrs</artifactId>
        <version>2.3.6.Final</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-jaxb-provider</artifactId>
        <version>2.3.6.Final</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-jackson-provider</artifactId>
        <version>2.3.6.Final</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>jaxrs-api</artifactId>
        <version>2.3.6.Final</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.6</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.7.6</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.1.2</version>
        <scope>compile</scope>
    </dependency>

</dependencies>

<build>

    <finalName>${project.artifactId}</finalName>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.2</version>
        </plugin>

        <plugin>

            <artifactId>maven-assembly-plugin</artifactId>
            <configuration>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
                <appendAssemblyId>false</appendAssemblyId>
            </configuration>
        </plugin>
    </plugins>
</build>

Answer 1

我通过使用 maven shade 构建它解决了这个问题。

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.3</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>com.google.MainClass</mainClass>
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

这里最重要的一行是：

<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />

shade插件配置需要the service transformer，它合并了the service discovery mechanism使用的META-INF/services文件。