Consider the example below. The error message is not actually wrong, but
a more helpful message would have suggested using Test.this.hashCode
instead.

$ cat -n Test.java 1 class Test {
     2 class Inner {
     3 public int hashCode() {
     4 return Test.hashCode(null);
     5 }
     6 }
     7 int hashCode(Object o) { return o.hashCode(); }
     8 }
$ javac Test.java
Test.java:4: non-static method hashCode(java.lang.Object) cannot be referenced from a static context
            return Test.hashCode(null);
                       ^
1 error
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