Invalid unused import warning

[merks]

For this example

package org.example.map.entry;

import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;

public final class Example {

	public static void saveProperties(final Map<String, String> properties) {
		new Properties() {
			private static final long serialVersionUID = 1L;

			@Override
			public Set<Entry<Object, Object>> entrySet() {
				Collection<String> keys = properties.keySet();
				LinkedHashMap<Object, Object> objectMap = new LinkedHashMap<>();
				for (String key : keys) {
					objectMap.put(key, properties.get(key));
				}
				return objectMap.entrySet();
			}
		};
	}
}

the compiler complains:

Description	Resource	Path	Location	Type
The import java.util.Map.Entry is never used	Example.java	/org.example.map.entry/src/org/example/map/entry	line 6	Java Problem

But if you delete the import the editor shows errors but in an odd way such that there are no errors if the Problems view:

[iloveeclipse]

Ed, I can't reproduce in 4.25 with my project/workspace/JRE settings.
Can you provide a project with JDT compiler settings set to reproduce this issue, and may be a hint which JDK is used?

[merks]

But you're right, I can't reproduce it in a fresh current SDK setup:

org.example.map.entry.zip

[merks]

It only happens when my JRE is C:\Program Files\Java\jdk-17.0.4.1+1. I think it happens for any Java 17 JDK...

[iloveeclipse]

It only happens when my JRE is C:\Program Files\Java\jdk-17.0.4.1+1.

I think it happens for any Java 17 JDK...

Is this only with or with any now?
Note: I've tried on Temurin-17.0.4+8 and couldn't reproduce with your project, also on 4.26 master.

[merks]

It also happens with C:\Program Files\Java\jdk-17.0.1+12

[srikanth-sankaran]

See also https://bugs.eclipse.org/bugs/show_bug.cgi?id=576952