Question

我正在使用JAVA EE，JAX-RS，JPA，GLASSFISH进行申请。如果 MediaType.APPLICATION_XML ，响应正常。它无法在 MediaType.APPLICATION_JSON 中使用。

这是我的pojo课程

@Entity
@XmlRootElement
public class Book {
    private int id;
    private String name;
    private String publication;
    private String price;

    @Id
    @Column(name = "id")
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Basic
    @Column(name = "name")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Basic
    @Column(name = "publication")
    public String getPublication() {
        return publication;
    }

    public void setPublication(String publication) {
        this.publication = publication;
    }

    @Basic
    @Column(name = "price")
    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Book book = (Book) o;

        if (id != book.id) return false;
        if (name != null ? !name.equals(book.name) : book.name != null) return false;
        if (publication != null ? !publication.equals(book.publication) : book.publication != null) return false;
        if (price != null ? !price.equals(book.price) : book.price != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = id;
        result = 31 * result + (name != null ? name.hashCode() : 0);
        result = 31 * result + (publication != null ? publication.hashCode() : 0);
        result = 31 * result + (price != null ? price.hashCode() : 0);
        return result;
    }
}

这是pom.xml文件。

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.rajesh</groupId>
    <artifactId>Library</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

端点的资源类

@Path("books")
public class BookResource {
    @GET
    @Path("{bookId}")
    @Produces({MediaType.APPLICATION_JSON})
    public Response getBookById(@PathParam("bookId") int id) {
        EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("abc");
        EntityManager entityManager = entityManagerFactory.createEntityManager();
        Book book = entityManager.find(Book.class, id);
        if (book == null) {
            return Response.status(Response.Status.NOT_FOUND).build();
        }
        return Response.status(Response.Status.OK).entity(book).build();
    }
}

Answer 1

这是Glassfish中的错误：https://github.com/javaee/glassfish/issues/21440 它可能无法修复，你应该切换到http://www.payara.fish/，它是修补版和Glassfish的更新版本（如果需要，甚至可以提供商业支持）。

此错误已在Payara修复。

Answer 2

将“ org.eclipse.persistence.moxy.jar”放入 $ GLASSFISHINSTALL / glassfish / modules

然后重新启动玻璃鱼

Answer 3

由于Glassfish 4.1.1的版本而出现问题。Eclipse Link中出现了一个错误。我正在使用 Glassfish 4.1.0 进行临时解决方案。

Answer 4

我有同样的错误，但是我的错误很有趣。我的pom.xml指向EE7 API，如下所示：

typechecker.getTypeAtLocation(node)

与此同时，我忘记了Glassfish 4.x实现的是EE6而不是EE7。我下载了Eclipse Glassfish 5.1.0，然后进行了排序！

尝试获取JSON响应时无法初始化类org.eclipse.persistence.jaxb.BeanValidationHelper

4 个答案: