Jersey: Json array with 1 element is serialized as object

Question

I\'m creating a REST server with Jersey/Java and I found a strange behavior.

I have a method on the server that returns an array of objects as Json

@         


        

Answer 1

I'm using cxf, here is my applicationContext.xml to force array in JSON:

<jaxrs:server id="myService" serviceName="MyService"
address="/mysvc">
<jaxrs:serviceBeans>
    <ref bean="myServiceImpl"/>
</jaxrs:serviceBeans>
<jaxrs:providers>
    <bean class="org.apache.cxf.jaxrs.provider.json.JSONProvider">
   <property name="dropRootElement" value="true" />
   <property name="supportUnwrapped" value="true" />
   <property name="namespaceMap">
      <map>
        <entry key="http://example.com/myservice" value=""/>
      </map>
   </property>
   <property name="arrayKeys">
      <list>
    <value>fileInfo</value>
      </list>
   </property>                          
    </bean>
</jaxrs:providers>
</jaxrs:server>

Answer 2

I've struggled quite a bit and found this simple solution

In your pom.xml:

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-jaxrs</artifactId>
    <version>1.9.13</version>
</dependency>
<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-xc</artifactId>
    <version>1.9.13</version>
</dependency>

In your web.xml:

<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.other-packages;org.codehaus.jackson.jaxrs</param-value>
</init-param>