泽西岛忽略杰克逊的注解

Question

我正在研究一个使用Jersey和Jackson将Java对象转换为JSON的Java项目。几天前，我注意到使用com.fasterxml.jackson.annotation.JsonProperty尝试更改JSON属性的名称无效。这个问题并不大，所以我忽略了它。今天，我在@Entity个POJO之间创建了JPA关系。关系是@OneToMany和@ManyToOne。其中一个POJO被转换为JSON，从而创建了无限递归（StackOverflowError）。我在其中一个字段上附加了com.fasterxml.jackson.annotation.JsonIgnore注释，但是就像在忽略该注释之前一样。我提供了我的pom.xml的摘录，我认为该摘录基于this answer的相关问题。

<properties>
    <jackson.version>2.8.7</jackson.version>
    <jersey.version>2.25.1</jersey.version>
    <hk2.version>2.4.0</hk2.version>
</properties>

<build>
    <plugins>
        <plugin>
            <groupId>org.glassfish.hk2</groupId>
            <artifactId>hk2-inhabitant-generator</artifactId>
            <version>${hk2.version}</version>
            <executions>
                <execution>
                    <goals>
                        <goal>generate-inhabitants</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

<weblogic-application>
    <prefer-application-packages>
        <package-name>com.fasterxml.jackson.*</package-name>
        <package-name>com.sun.jersey.*</package-name>
        <package-name>jersey.repackaged.*</package-name>
        <package-name>org.glassfish.*</package-name>
        <resource-name>META-INF/services/org.glassfish.hk2.*</resource-name>
    </prefer-application-packages>
    <prefer-application-resources>
        <resource-name>META-INF/services/org.glassfish.jersey.*</resource-name>
        <resource-name>org.glassfish.jersey.*</resource-name>
        <resource-name>jersey.repackaged.*</resource-name>
        <resource-name>META-INF/services/org.glassfish.hk2.*</resource-name>
    </prefer-application-resources>
</weblogic-application>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-joda</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-json-provider</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey</groupId>
            <artifactId>jersey-bom</artifactId>
            <version>${jersey.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.cdi</groupId>
            <artifactId>jersey-cdi1x</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.cdi</groupId>
            <artifactId>jersey-cdi1x-transaction</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.cdi</groupId>
            <artifactId>jersey-cdi1x-servlet</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-common</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-client</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-server</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>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-multipart</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-jetty-http</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-grizzly2-http</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-grizzly2-servlet</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-jetty-servlet</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-jdk-http</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet-core</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-simple-http</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers.glassfish</groupId>
            <artifactId>jersey-gf-ejb</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-bean-validation</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-declarative-linking</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-entity-filtering</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-metainf-services</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-mvc</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-mvc-bean-validation</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-mvc-freemarker</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-mvc-jsp</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-mvc-mustache</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-proxy-client</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-servlet-portability</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-spring3</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-wadl-doclet</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.cdi</groupId>
            <artifactId>jersey-cdi1x-ban-custom-hk2-binding</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.cdi</groupId>
            <artifactId>jersey-cdi1x-validation</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.cdi</groupId>
            <artifactId>jersey-weld2-se</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.rx</groupId>
            <artifactId>jersey-rx-client</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.rx</groupId>
            <artifactId>jersey-rx-client-guava</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.rx</groupId>
            <artifactId>jersey-rx-client-java8</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.rx</groupId>
            <artifactId>jersey-rx-client-jsr166e</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext.rx</groupId>
            <artifactId>jersey-rx-client-rxjava</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-jaxb</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>html-json</artifactId>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-jettison</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-processing</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-kryo</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-moxy</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-sse</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.security</groupId>
            <artifactId>oauth1-client</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.security</groupId>
            <artifactId>oauth1-server</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.security</groupId>
            <artifactId>oauth1-signature</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.security</groupId>
            <artifactId>oauth2-client</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework</groupId>
            <artifactId>jersey-test-framework-core</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework</groupId>
            <artifactId>jersey-test-framework-util</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-bundle</artifactId>
            <version>${jersey.version}</version>
            <type>pom</type>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-external</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-grizzly2</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-inmemory</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-jdk-http</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-jetty</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-simple</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.bundles</groupId>
            <artifactId>jaxrs-ri</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.bundles.repackaged</groupId>
            <artifactId>jersey-guava</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.bundles.repackaged</groupId>
            <artifactId>jersey-jsr166e</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.connectors</groupId>
            <artifactId>jersey-apache-connector</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.connectors</groupId>
            <artifactId>jersey-grizzly-connector</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.connectors</groupId>
            <artifactId>jersey-jetty-connector</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.hk2</groupId>
            <artifactId>hk2-bom</artifactId>
            <version>${hk2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.hk2.external</groupId>
            <artifactId>javax.inject</artifactId>
            <version>${hk2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.hk2</groupId>
            <artifactId>hk2-api</artifactId>
            <version>${hk2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.hk2</groupId>
            <artifactId>hk2-locator</artifactId>
            <version>${hk2.version}</version>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies></dependencies>

这是令人反感的类：

@Entity
@Table(name = "PAGE")
@XmlRootElement
public class Page implements Serializable {

    //... Id and other fields here

    @JsonIgnore
    @OneToMany(fetch = LAZY, mappedBy = "page")
    private Set<Activity> analyticsActivity;
}

Answer 1

前一段时间，我在类范围上使用了相同的问题注释JsonIgnoreProperties。在杰克逊上，当您要忽略某些字段时，需要指定字段名称。

@JsonIgnoreProperties(ignoreUnknown = true, value= {"prev", "next"})
public class Model implements Serializable {
    private Model prev;
    private Model next; ....

Jackson Ignore Annotations example

为防止发生“无限递归（StackOverflowError）”，请确保没有任何引用（调用内部成员的方法），以防止您也忽略此字段。 “无限递归（StackOverflowError）”的示例

public class Model implements Serializable {
    private Model prev; // reference previous model
    private Model next; // reference next model

这种类型的数据结构导致无限递归，因为杰克逊总是得到prev或next字段并一次又一次地获得。

Answer 2

不幸的是，我发现的解决方案甚至与杰克逊或泽西岛也没有任何关系。正如某人所说：“这是不必要的，令人困惑的，并且使弄清楚实际用于什么用途变得困难。”在我的问题中，我没有共享整个174个依赖项长的pom.xml，因此任何人都不可能回答这个问题。我希望有人会觉得有用。

当我在字段中添加@XmlTransient时，没有任何积极的区别。当我将其添加到getter和字段中时，我能够从产生的JSON中隐藏analyticsActivity。我没有测试仅将@XmlTransient添加到吸气剂是否有效。

import javax.xml.bind.annotation.XmlTransient;

@Entity
@Table(name = "PAGE")
@XmlRootElement
public class Page implements Serializable {

    //... Id and other fields here

    @XmlTransient
    @OneToMany(fetch = LAZY, mappedBy = "page")
    private Set<Activity> analyticsActivity;

    @XmlTransient
    public Set<TmptREPDeskAnalytics> getAnalyticsActivity() {
        return analyticsActivity;
    }
}