【问题标题】:500 internal error while creating restAPI in jersey在球衣中创建 REST API 时出现 500 内部错误
【发布时间】:2022-01-29 18:35:29
【问题描述】:

我在 jersey 项目的其余 API 上执行基本程序时收到 500 个内部错误

学生.java

package com.api.api;


import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Student {
    private String name;
    private String subject;
    private String marks;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSubject() {
        return subject;
    }
    public void setSubject(String subject) {
        this.subject = subject;
    }
    public String getMarks() {
        return marks;
    }
    public void setMarks(String marks) {
        this.marks = marks;
    }
}


StudentResource.java

package com.api.api;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

@Path("student")
public class StudentResource {
    
    @GET
    @Produces(MediaType.APPLICATION_XML)
    public Student getStudents()
    {
        System.out.println("called...");
        Student s1=new Student();
        s1.setMarks("19");
        s1.setName("kart");
        s1.setSubject("maths");
        
        System.out.println(s1.getMarks());
        
        return s1;
       // return "<?xml version=\"1.0\"?>" + "<hello> Hello Jersey" + "</hello>";  
    }

}

这是我的 pom.xml 文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.api</groupId>
    <artifactId>api</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>api</name>

    <build>
        <finalName>api</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <inherited>true</inherited>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <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-servlet-core</artifactId>
            <!-- use the following artifactId if you don't need servlet 2.x compatibility -->
            <!-- artifactId>jersey-container-servlet</artifactId -->
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.inject</groupId>
            <artifactId>jersey-hk2</artifactId>
        </dependency>
        <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.3.1</version>
        </dependency>
        
        <!-- uncomment this to get JSON support
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-binding</artifactId>
        </dependency>
        -->
    </dependencies>
    <properties>
        <jersey.version>2.26-b06</jersey.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
</project>


我在哪里另外添加了这个依赖项

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>

这是我得到的输出

我怀疑 XML 绑定存在一些问题,因为当我将 XML 作为字符串返回时它工作正常,但是当我将对象转换为 XML 时出现内部错误,所以请帮我解决这个问题

这是我在eclipse中的文件结构

而且我也看不到任何错误日志

【问题讨论】:

  • 当您说“我无法看到任何错误日志”时,您的意思是日志中没有错误,或者您不知道日志是在哪里创建的?
  • 我的意思是说控制台没有打印错误
  • 查看 servlet 引擎日志文件。

标签: java rest jaxb jersey


【解决方案1】:

根本原因分析

ClassNotFoundException

可能ClassNotFoundExceptionorg.glassfish.hk2.osgiresourcelocator.ServiceLoader#lookupProviderClasses方法抛出的。

ClassNotFoundException 异常消息:

java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory

ClassNotFoundException 异常堆栈跟踪:

java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:636)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:182)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
    at javax.xml.bind.ServiceLoaderUtil.nullSafeLoadClass(ServiceLoaderUtil.java:122)
    at javax.xml.bind.ServiceLoaderUtil.safeLoadClass(ServiceLoaderUtil.java:155)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:276)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:421)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:721)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:662)
    at org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getStoredJaxbContext(AbstractJaxbProvider.java:311)
<…>

JAXBException

上面提到的ClassNotFoundException异常被javax.xml.bind.ContextFinder#newInstance(java.lang.Class[], java.util.Map, java.lang.String)方法捕获并重新抛出为JAXBException

JAXBException 异常消息:

javax.xml.bind.JAXBException:在模块路径或类路径上找不到 JAXB-API 的实现。

  • 带有链接异常: [java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory]

JAXBException 异常堆栈跟踪:

javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.
 - with linked exception:
[java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory]
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:278)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:421)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:721)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:662)
    at org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getStoredJaxbContext(AbstractJaxbProvider.java:311)
    at org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getJAXBContext(AbstractJaxbProvider.java:296)
    at org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getMarshaller(AbstractJaxbProvider.java:263)
    at org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getMarshaller(AbstractJaxbProvider.java:230)
    at org.glassfish.jersey.jaxb.internal.AbstractRootElementJaxbProvider.writeTo(AbstractRootElementJaxbProvider.java:174)
    at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.invokeWriteTo(WriterInterceptorExecutor.java:266)
<…>
Caused by: java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:636)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:182)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
<…>

根本原因

JAXBException 异常消息描述了根本原因:

javax.xml.bind.JAXBException:在模块路径或类路径上找不到 JAXB-API 的实现。

解决方案

添加 JAXB 实现 Maven 依赖项。

例如,这个似乎适用于提到的 JAXB API 版本:

<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-impl</artifactId>
    <version>2.3.6</version>
    <scope>runtime</scope>
</dependency>

【讨论】:

  • 非常感谢我浪费了 3 天的时间,你帮了我很多
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