JSON ContentTypeHandler

By Nicolas | Published: 2017/12/12
The default JSON Content Handler is build on top of the JSON-lib. If you prefer to use the Jackson framework for JSON serialisation, you can configure the JacksonLibHandler as Content Handler for your json requests.

First you need to add the jackson dependency to your web application by downloading the jar file and put it under WEB-INF/lib or by adding following xml snippet to your dependencies section in the pom.xml when you are using maven as build system.

<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>
where ${jackson.version} is the latest available version of the libs, right now it is 2.9.2.

Now you can overwrite the Content Handler with the Jackson Content Handler in the struts.xml:

<bean type="org.apache.struts2.rest.handler.ContentTypeHandler" name="jackson" class="org.apache.struts2.rest.handler.JacksonLibHandler"/>
<constant name="struts.rest.handlerOverride.json" value="jackson"/>

<!-- Set to false if the json content can be returned for any kind of http method -->
<constant name="struts.rest.content.restrictToGET" value="false"/> 

<!-- Set encoding to UTF-8, default is ISO-8859-1 -->
<constant name="struts.i18n.encoding" value="UTF-8"/>
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