I wrote a Java Web Application where I replace URLs to static content at build time to add version information, primarely for caching.
For example, href=\"mya
The includes tag works with version 1.5.2 as well, you just have to specify the basedir tag before includes, and put the filepath (excluding the filename) as the basedir value and just the filename as the include tag value. So in your case something like this should work:
com.google.code.maven-replacer-plugin
replacer
1.5.2
prepare-package
replace
${project.build.directory}/myApp
index.jsp
%PROJECT_VERSION%
${project.version}