Tiles 3
Plugins
To be able to use Apache Tiles 3 support in IntelliJ IDEA, make sure that the Struts 2 plugin is enabled if you want to use the OGNL support.
This plugin is bundled with the IDE and enabled by default. See Manage plugins.
Libraries
To get the library files for your Tiles 3 development, use the Apache Tiles Downloads page.
Don't forget to add your libraries to the dependencies of corresponding modules.
Overview of Tiles 3 support
Tiles 3 support in IntelliJ IDEA includes code completion, and syntax and error highlighting for:
Tiles definition files
Expression languages (EL): Unified EL and Object-Graph Navigation Language (OGNL)
Tiles - JSP support tag library