How to Serialize Only a Specific Object with Struts2 JSON Plugin?

Struts2 JSON Plugin and Root Objects

The Struts2 JSON plugin typically serializes an entire action into JSON. However, if you only need to serialize a specific object, you can specify a root object using the "root" attribute in your struts.xml configuration.

In the example provided, the error occurs because the JSON plugin is attempting to serialize the entire Part action, which includes a list of SearchResult objects. However, the jQuery success handler is expecting a JSON object with specific keys, such as col1 and col2.

Solution using Root Object

To resolve this issue, you can specify the rows list as the root object in your struts.xml file:

<result type="json">
    <param name="root">rows</param>
</result>

This will instruct the plugin to only serialize the rows list, which is the object you want to access in your jQuery success handler.

In your action class, you can create a getter method for the rows list:

public List<MyRow> getRows() {
    return this.rows; 
}

Value Object for Custom Serialization

To define the columns in your JSON object, you can create a value object like MyRow with getters and setters for the col1 and col2 properties. This allows you to customize the serialization format.

Updated jQuery Callback

With the root object specified, your jQuery success handler can be updated to access the data using the $.each function:

var handledata = function(data) {
    $.each(data, function(index) {
        alert(data[index].col1);
        alert(data[index].col2);
    });
}

By using a root object, you can control the serialization process and ensure that the data you need is available in your jQuery success handler.

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