The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files [duplicate]

问题

I am writing a simple Java program on Eclipse.

import java.util.HashMap;

public class Demo {
    public static void main(String[] args) {
        HashMap<String, String> hash = new HashMap();
    }
}

The above program generates the following errors.

The project was not built since its build path is incomplete. Cannot find the class file for java.util.Map$Entry. Fix the build path then try building this project.
The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files.

I searched over the internet almost everywhere, but I was not able to correct this.

I have installed Java SE 8u5 (JDK) (http://www.oracle.com/technetwork/java/javase/downloads/index.html?ssSourceSiteId=otnjp)

Windows -> Preferences -> Installed JREs shows

a) jdk C:\Program Files\Java\jdk

Project -> Build Path -> Libraries shows

a) JRE system library (jdk)

b) JRE system library (jre8)

Please somebody help me.

EDIT: Changing Eclipse version from Helios to Juno solved the problem!

回答1:

I've seen occasional problems with Eclipse forgetting that built-in classes (including Object and String) exist. The way I've resolved them is to:

On the Project menu, turn off "Build Automatically"
Quit and restart Eclipse
On the Project menu, choose "Clean…" and clean all projects
Turn "Build Automatically" back on and let it rebuild everything.

This seems to make Eclipse forget whatever incorrect cached information it had about the available classes.

来源：https://stackoverflow.com/questions/24110620/the-type-java-util-mapentry-cannot-be-resolved-it-is-indirectly-referenced-fro

标签

java

eclipse

hashmap

libraries