Java 泽西岛+；Grizzly HTTP+；Jackson（未找到媒体类型为application/xml的MessageBodyWriter）

我在POM依赖项和Jersey模块注册之间苦苦挣扎，以便基于Accept请求头生成XML和/或JSON响应

这里是POM中的依赖项

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <jersey.version>2.25.1</jersey.version>
    <jackson.version>2.8.8</jackson.version>
</properties>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey</groupId>
            <artifactId>jersey-bom</artifactId>
            <version>${jersey.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-grizzly2-http</artifactId>
        <version>${jersey.version}</version>
    </dependency>

    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-jaxb</artifactId>
        <version>${jersey.version}</version>
    </dependency>

    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-jackson</artifactId>
        <version>${jersey.version}</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.jaxrs</groupId>
        <artifactId>jackson-jaxrs-json-provider</artifactId>
        <version>${jackson.version}</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.module</groupId>
        <artifactId>jackson-module-jaxb-annotations</artifactId>
        <version>${jackson.version}</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
        <version>${jackson.version}</version>
    </dependency>

    <dependency>
        <groupId>org.codehaus.woodstox</groupId>
        <artifactId>woodstox-core-asl</artifactId>
        <version>4.1.2</version>
    </dependency>

    ....
</dependencies>

相关资源

@Path("/cat")
public class SystemInfoResource {

    @GET
    @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
    public SysInfo fetchSystemProperties() throws Exception {
        SysInfo result = new SysInfo();

        try {
            OperatingSystemMXBean operatingSystemMXBean =
                    (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
            result.setProcessCpuLoad(operatingSystemMXBean.getProcessCpuLoad());
            result.setSystemCpuLoad(operatingSystemMXBean.getSystemCpuLoad());
            result.setTotalPhysicalMemorySize(operatingSystemMXBean.getTotalPhysicalMemorySize());
            result.setFreePhysicalMemorySize(operatingSystemMXBean.getFreePhysicalMemorySize());
            result.setNrOfProcessors(operatingSystemMXBean.getAvailableProcessors());
        } catch (Exception ignore) {

        }

        result.setJavaHome(System.getProperty("java.home"));
        result.setJavaVersion(System.getProperty("java.versione"));
        result.setOsArch(System.getProperty("os.arch"));
        result.setOsName(System.getProperty("os.name"));

        return result;
    }
}

来自配置和模块注册的代码段

this.config = new ResourceConfig();
this.config.register(LoggingFeature.class);
this.config.register(JacksonFeature.class);

this.config.register(new JacksonObjectMapperProvider());
...
this.config.register(SystemInfoResource.class);

其中JacksonObjectMapperProvider是以下类

public class JacksonObjectMapperProvider implements ContextResolver<ObjectMapper> {

    final private ObjectMapper  defaultObjectMapper;

    public JacksonObjectMapperProvider() {
        defaultObjectMapper = createDefaultMapper();
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        return defaultObjectMapper;
    }

    private static ObjectMapper createDefaultMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.findAndRegisterModules();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.enable(SerializationFeature.INDENT_OUTPUT);

        return mapper;
    }
}

有什么帮助吗

问候,，

---

Luca

通常情况下，它应该可以正常工作，这意味着JAXB支持所需的所有提供者都应该通过自动注册。出于某种原因，自动发现不适合您。我能想到的唯一一件事是，如果你明确地，或者你正在构建一个uber jar，并且

---

在任何情况下，如果您想自己手动注册提供者（否则会是这样），您可以这样做。只需将

JaxbMessagingBinder

和

JaxbParamConverterBinder

（作为实例-而不是类）注册到

ResourceConfig

中，这是其中的一个问题吗？如果不是的话，我不知道是怎么回事。看起来应该能用。明确地尝试使用您的ResourceConfig@peeskillet非常感谢你！手动注册两个活页夹，一切正常。如果你把你的评论作为回答，我会接受的。再次感谢。卢卡

public class JacksonObjectMapperProvider implements ContextResolver<ObjectMapper> {

    final private ObjectMapper  defaultObjectMapper;

    public JacksonObjectMapperProvider() {
        defaultObjectMapper = createDefaultMapper();
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        return defaultObjectMapper;
    }

    private static ObjectMapper createDefaultMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.findAndRegisterModules();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.enable(SerializationFeature.INDENT_OUTPUT);

        return mapper;
    }
}

giu 21, 2017 12:09:03 PM org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor aroundWriteTo
GRAVE: MessageBodyWriter not found for media type=application/xml;charset=UTF-8, type=class com.example.dmc.core.models.SysInfo, genericType=class com.example.dmc.core.models.SysInfo.
2017-06-21 12:09:03 [grizzly-http-server-1] ERROR c.n.d.j.e.DefaultExceptionMapper - Error handling a request: 80fdaf04b7bfc5d1
javax.ws.rs.InternalServerErrorException: HTTP 500 Internal Server Error
        at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:90)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)
        at org.glassfish.jersey.logging.LoggingInterceptor.aroundWriteTo(LoggingInterceptor.java:225)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)
        at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1130)
        at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:711)
        at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:444)
        at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:434)
        at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:329)
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
        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:267)
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)
        at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:384)
        at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:224)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573)
        at java.lang.Thread.run(Unknown Source)
Caused by: org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=application/xml;charset=UTF-8, type=class com.example.dmc.core.models.SysInfo, genericType=class com.example.dmc.core.models.SysInfo.
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:247)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)
        at org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:106)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)
        at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:86)
        ... 21 common frames omitted