This works only if the other project is bundled in flavor of a JAR file in /WEB-INF/lib
folder of the main webapp project and if the JSP file is in turn placed in /META-INF/resources
folder of the other project.
So, if you have a /META-INF/resources/common/webappfooter.jsp
in the other project, then the following include should do:
<jsp:include path="/common/webappfooter.jsp" />
If you're using a bit self-respected IDE, you can configure it to automatically bundle the other project as JAR of webapp project's /WEB-INF/lib
. It's unclear what IDE you're using, but in Eclipse it's a matter of adding the other project as Deployment Assembly in the main webapp project's properties.
In Eclipse, to create such a project with the right folder structure prepared, choose the "Web Fragment Project" wizard.
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