Jersey Grizzly HTTP Jackson（找不到媒体类型= application / xml的MessageBodyWriter）-Java 学习之路

我在POM依赖项和Jersey模块注册之间苦苦挣扎，以便根据Accept请求标头生成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>

一个简单的带注释的bean

@XmlRootElement
public class SysInfo {

    @XmlElement
    private int nrOfProcessors;

    @XmlElement
    private long freePhysicalMemorySize;

    @XmlElement
    private long totalPhysicalMemorySize;

    @XmlElement
    private String javaHome;
    @XmlElement
    private String javaVersion;

    @XmlElement
    private String osArch;
    @XmlElement
    private String osName;

    @XmlElement
    private double processCpuLoad;

    @XmlElement
    private double systemCpuLoad;


    public SysInfo() { }

    public int getNrOfProcessors() {
        return nrOfProcessors;
    }

    public void setNrOfProcessors(int nrOfProcessors) {
        this.nrOfProcessors = nrOfProcessors;
    }

    public long getFreePhysicalMemorySize() {
        return freePhysicalMemorySize;
    }

    public void setFreePhysicalMemorySize(long freePhysicalMemorySize) {
        this.freePhysicalMemorySize = freePhysicalMemorySize;
    }

    public long getTotalPhysicalMemorySize() {
        return totalPhysicalMemorySize;
    }

    public void setTotalPhysicalMemorySize(long totalPhysicalMemorySize) {
        this.totalPhysicalMemorySize = totalPhysicalMemorySize;
    }

    public String getJavaHome() {
        return javaHome;
    }

    public void setJavaHome(String javaHome) {
        this.javaHome = javaHome;
    }

    public String getJavaVersion() {
        return javaVersion;
    }

    public void setJavaVersion(String javaVersion) {
        this.javaVersion = javaVersion;
    }

    public String getOsArch() {
        return osArch;
    }

    public void setOsArch(String osArch) {
        this.osArch = osArch;
    }

    public String getOsName() {
        return osName;
    }

    public void setOsName(String osName) {
        this.osName = osName;
    }

    public double getProcessCpuLoad() {
        return processCpuLoad;
    }

    public void setProcessCpuLoad(double processCpuLoad) {
        this.processCpuLoad = processCpuLoad;
    }

    public double getSystemCpuLoad() {
        return systemCpuLoad;
    }

    public void setSystemCpuLoad(double systemCpuLoad) {
        this.systemCpuLoad = systemCpuLoad;
    }
}

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;
    }
}

配置和模块注册的片段

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;
    }
}

当我使用Accept =“application / json”调用资源时，一切正常 . 但是，当我指定Accept =“application / xml”时，grizzly会响应此异常：

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

有帮助吗？

此致，卢卡

1 回答

1

通常它应该正常工作，这意味着JAXB支持所需的所有提供程序都应该通过auto-discovery自动注册 . 出于某种原因，自动发现不适合您 . 我能想到的唯一能让它不起作用的是你明确disable it，或者你正在建造一个超级 jar ，以及META-INF service files don't get included .

在任何情况下，如果你想自己手动注册提供者（原本就是registed by the AutoDiscoverable），你可以这样做 . 只需使用 ResourceConfig 注册 JaxbMessagingBinder 和 JaxbParamConverterBinder （作为实例 - 而不是类）

回复于 2024-05-17T19:26:14+08:00

Jersey Grizzly HTTP Jackson（找不到媒体类型= application / xml的MessageBodyWriter）

1 回答

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