JAX-RS（Genson +球衣）：对象未转换为json

时间：2018-10-09 09:18:45

标签： java json jersey jax-rs genson

我有一个在rest上运行的示例tomcat应用程序。

回复时-类型ActionError的对象作为json字符串发送到客户端。

ActionError将传递给客户端

  1. {{1}中的Array 2
  2. Strings个中的{li {1}}
  3. 任意Array 有效载荷（定义为通用类型）。

在测试中，我将FieldError类型的对象作为Object传递。

采用上述安排-一切正常。我得到的结果是：

payload

但是，如果我删除 Employee（{"actionErrors":["everything is ok"],"fieldErrors":null,"payload":{"empName":"Jony","empNo":"E3","position":"Manager"}} ）部分中的Array，则-{{1} }现在仅包含：

1。FieldError中的private ArrayList<FieldError> fieldErrors;

2。ActionError Array

然后奇怪的是，Strings 未正确序列化，我得到了：

Object

是什么原因造成的？关于如何解决的任何想法？

谢谢。

下面是类定义：

ActionError.java 

payload

FieldError.java 

payload

Employee.java 

{"actionErrors":["everything is ok"],"payload":"com.mycompany.mavenwebproject.model.Employee@41a8e0d9"}

1 个答案:

答案 0 :(得分：0)

我设法使用以下依赖项在Glassfish 4.1.1和Tomcat 8上同时运行了上述代码：

Tomcat 8 

<dependency>
    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.bundles/jaxrs-ri -->
        <groupId>org.glassfish.jersey.bundles</groupId>
        <artifactId>jaxrs-ri</artifactId>
        <version>2.12</version>
        <type>zip</type>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.owlike/genson -->
    <dependency>
        <groupId>com.owlike</groupId>
        <artifactId>genson</artifactId>
        <version>1.4</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.2.7</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.ws.rs/javax.ws.rs-api -->
    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>javax.ws.rs-api</artifactId>
        <version>2.0.1</version>
    </dependency>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>7.0</version>
        <scope>provided</scope>
    </dependency>

玻璃鱼4.1.1 

 <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
  <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.bundles/jaxrs-ri -->      

        <dependency>
            <groupId>org.glassfish.jersey.bundles</groupId>
            <artifactId>jaxrs-ri</artifactId>
            <version>2.12</version>    
            <scope>provided</scope>
            <type>zip</type>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.owlike/genson -->

         <dependency>
            <groupId>com.owlike</groupId>
            <artifactId>genson</artifactId>
            <version>1.4</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.2.7</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.ws.rs/javax.ws.rs-api -->
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>2.0.1</version>
        </dependency>
       <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>

我的 web.xml 还有以下条目：

<servlet>
        <servlet-name>jersey-serlvet</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
             <param-name>jersey.config.server.provider.packages</param-name>
             <param-value>com.mycompany.mavenwebproject</param-value>
        </init-param>
        <init-param>
        <param-name>jersey.config.server.provider.classnames</param-name>
        <param-value>org.glassfish.jersey.jackson.JacksonFeature</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>jersey-serlvet</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

还要在 Glassfish 3.1.2 的Jersey 1.x上运行，并且不需要Genson。

因此， pom.xml 依赖项如下所示：

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-server</artifactId>
    <version>1.8</version>
</dependency>

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-json</artifactId>
    <version>1.8</version>
</dependency>

   <dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-web-api</artifactId>
    <version>6.0</version>
    <scope>provided</scope>
</dependency>

和 web.xml 条目：

<servlet>
        <servlet-name>jersey-serlvet</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>com.mycompany.mavenwebproject</param-value>
        </init-param>
        <init-param>
            <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
            <param-value>true</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>jersey-serlvet</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

编辑1

为了放弃在genson上使用glassfish 4.1.1，应将丢失的库jackson-module-jaxb-annotations-2.5.4.jar添加到Glassfish模块目录中。  否则

  

java.lang.ClassNotFoundException：
  找不到com.fasterxml.jackson.module.jaxb.JaxbAnnotationIntrospector   通过com.fasterxml.jackson.jaxrs.jackson-jaxrs-json-provider

将被抛出。 但是，如果添加了上面的jar，那么Glassfish的pom可能如下：

Glassfish 4.1.1（已修复缺少库的错误） 

<dependencies>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.3.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
  <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.bundles/jaxrs-ri -->      

        <dependency>
            <groupId>org.glassfish.jersey.bundles</groupId>
            <artifactId>jaxrs-ri</artifactId>
            <version>2.12</version>    
            <scope>provided</scope>
            <type>zip</type>
        </dependency>


        <!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.2.7</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.ws.rs/javax.ws.rs-api -->
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>2.0.1</version>
        </dependency>

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

编辑2。

如果要在带有球衣1的Glassfish 3.1.2上使用杰克逊2，请执行以下操作 配置正确

pom.xml 

  <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
  <dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-server</artifactId>
    <version>1.8</version>
</dependency>

<!-- removed to use jackson 2 not 1
<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-json</artifactId>
    <version>1.8</version>
</dependency>
-->

<!-- jackson 2 json provider  -->
<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-json-provider</artifactId>
    <version>2.2.3</version>
</dependency>

<!-- jackson 2 xml provider 
<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-xml-provider</artifactId>
    <version>2.2.3</version>
</dependency>
-->
<dependency>
    <groupId>com.sun.jersey.contribs</groupId>
    <artifactId>jersey-multipart</artifactId>
    <version>1.8</version>
</dependency>
   <dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-web-api</artifactId>
    <version>6.0</version>
    <scope>provided</scope>
    </dependency>
      <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.3.2</version> <!-- unlike jersey 2 on glassfish 4.1.1 here it is not provided! -->
       </dependency>

    </dependencies>

和 web.xml 变为

<servlet>
        <servlet-name>jersey-serlvet</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>
                                     com.mycompany.mavenwebproject
                                    <!--
                                    Jackson 2.x JAX-RS @Providers
                                    -->
                                     com.fasterxml.jackson.jaxrs.json <!--JSON -->
                                     <!-- com.fasterxml.jackson.jaxrs.xml  -->  <!-- XML -->
                        </param-value>
        </init-param>
        <init-param>
            <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
            <param-value>true</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>jersey-serlvet</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
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