This simple code generates an error in Eclipse (Version: 2022-06 (4.24.0)), but not in javac (see related issue JDK-8289171 in javafx).

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package goryachev.bugs;

import java.lang.reflect.Field;

public class TestNullFinal {
    private
    // uncomment to cause a 'blank final field may not have been initialized' error in Eclipse
    //final
    A isNull;
    
    public TestNullFinal() {
        isNull = new A("constructor");
        System.out.println("test=" + test);
    }
    
    public static void main(String[] args) {
        new TestNullFinal();
    }
    
    private Runnable runnable = () -> {
        // ERROR: blank final field may not have been initialized
        isNull.hashCode();
    };
    
    private Object test = isNullValue();
    
    protected Object isNullValue() {
        return (isNull);
    }
    
    protected static class A {
        public A(String text) {
            System.out.println(text);
        }
    }
}

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To reproduce, uncomment line 8 (// final).

The problem is further illustrated by running the test case as is, notice that the variable isNull when the 'test' field is initialized:

stderr output:
constructor
test=null