<dependency>
  <groupId>org.apache.struts</groupId>
  <artifactId>struts2-json-plugin</artifactId>
  <version>6.4.0</version>
</dependency>

'org.apache.struts:struts2-json-plugin:jar:6.4.0'

<dependency org="org.apache.struts" name="struts2-json-plugin" rev="6.4.0">
  <artifact name="struts2-json-plugin" type="jar" />
</dependency>

@Grapes(
@Grab(group='org.apache.struts', module='struts2-json-plugin', version='6.4.0')
)

compile 'org.apache.struts:struts2-json-plugin:6.4.0'

libraryDependencies += "org.apache.struts" % "struts2-json-plugin" % "6.4.0"

[org.apache.struts/struts2-json-plugin "6.4.0"]