How to Compile Class for Jsp: the Type Java.Util.Map$Entry Cannot Be Resolved. It Is Indirectly Referenced from Required .Class Files

Unable to compile class for JSP: The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files

You must use a more recent version of tomcat which has support for JDK 8.

I can confirm that apache-tomcat-7.0.35 does NOT have support for JDK8, I can also confirm that apache-tomcat-7.0.50 DOES have support for JDK8.

JDK8 - The type java.util.Map$Entry cannot be resolved

I have updated my glassfish application server and it has been solved my problem.

The type java.util.Map$Entry cannot be resolved (tomcat6 + JDK7)

Run Tomcat with Java 6 or upgrade to Tomcat 7 and make sure you don't have some old pre-Java 5/pre-generics library on the classpath.

Why do you get this error? Somewhere in the JSP code (not your code, mind), is a dependency on java.util.Map.Entry. This could be in code which Jasper generates from your JSP.

It's not a direct dependency; rather your code (or the Java code generated from your JSP) needs something else which then needs java.util.Map.Entry

But the interface has changed in some way. Usually, that's with Java 8 because of the new static helper methods which they added: The name of the class is the same (which makes the error so confusing) but the API has changed and the code can't find something (or found something it didn't expect).

A similar problem can happen when you try to compile against a pre-generics class (even though that should work).

Even worse, import java.util.Map in your JSP works. It's the existing bytecode somewhere else that causes the trouble.

[EDIT]

In my /WEB-INF/lib/ folder I've: commons-fileupload, commons-io, poi and rt (may this one be the problem?)

Yes :-) rt.jar is the Java runtime. It contains java.* and in your case, a version of java.util.Map which doesn't match the one from your Java VM.

Remote it and it should work.

Tomcat: java.util.Map$Entry cannot be resolved

This is an issue with dependencies. Please check you have the correct java version please not Tomcat 7.027 doesn't play well with java 8. Also in your dependencies ensure you have the correct version.

The type java.util.Map$Entry cannot be resolved

(Just for the sake of completeness.)

One reason might be that Tomcat 6 does not run with Java 8 (nor do some versions of Tomcat 7; I stumbled over that problem myself once):
https://stackoverflow.com/a/21322569/694804

So, it is highly suggested to use a recent version of Tomcat 7.0.x (or even 8) when using Java 8.