Here is a repro:

  @Test
  public void test() throws Exception {
    String expressiosn = "list.isEmpty()";
    Object expr = Ognl.parseExpression(expressiosn);
    OgnlContext ctx = new OgnlContext();
    List<String> list = Collections.singletonList("string");
    ctx.put("list", list);
    Object value = Ognl.getValue(expr, ctx);
    Assert.assertFalse((Boolean)value);
  }

The above test passes, but the following message is output in System.err.

Two methods with same method signature but not providing classes assignable? "public abstract boolean java.util.List.isEmpty()" and "public boolean java.util.AbstractCollection.isEmpty()" please report!

• The line that outputs the message is here.
• This seems to be a side effect of ca37319 .

This was reported on MyBatis tracker a while ago.