How to access static method in struts?

For Static Method Access, you must need to add following constant in your struts.xml file.

<constant name="struts.ognl.allowStaticMethodAccess" value="true"/> 

Example: struts.xml:

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <constant name="struts.ognl.allowStaticMethodAccess" value="true"/>
    <package name="default"  namespace="/" extends="struts-default">
        <action name="sampleAction" class="vaannila.SampleAction">
            <result name="success">/WEB-INF/JSP/sample.jsp</result>
        </action>     
    </package>
</struts>

Then from your JSP you can access it in various ways:

Example - 1:

<b>Output :</b> <s:property value="@vaannila.SampleAction@getSTR()"/> <br>

Where,

1. vaannila = Package Name.
2. SampleAction = Class Name.
3. getSTR() = Method Name.

Example - 2:

<b>Output :</b> <s:property value="@vs@getSTR()"/> <br>

Where,

1. vs = Value Stack.
2. getSTR() = Method Name.

Example - 3:

<b>Output :</b> <s:property value="%{STR}"/> <br>

where,

1. STR = STR is declared and initialized as Static String with getter and setter method in your Java Class

Original Link: Calling static method helper class in Struts2 JSP with Action data model value