Suppressing Java unchecked warnings in JSP files

Question

I have a legacy webapp which uses jstl and Struts 1 tags. When I pre-compile the JSP files with Java 5/6, the jstl and Struts 1 tags throw warnings about "unchecked or unsafe operations". For example, if I use the following tag:

<%@ page import="/anotherpage.inc" %>

The following warning is thrown:

[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.

If I recompile with -Xlint:unchecked, I get details about the internal working of the offending JSP tag library. I would like to suppress all unchecked operation warnings. I thought that using -Xlint:-unchecked would suppress the warnings, but it did not.

How do I suppress these warnings when compiling my JSP pages? It would not be practical to re-code the JSP tag libraries or update a thousand JSP pages. I'm looking for a compiler flag to globally disable the warning so I can see all warnings except for unchecked warnings. Thanks!

Answer 1

Those messages are a (mandatory for JDK >= 1.5) note, not a warning.

compiler.note.unchecked.plural=\
    Some input files use unchecked or unsafe operations.

The default compiler behaviour is the same as with -Xlint:-unchecked.

With -Xlint:unchecked you turn the warning on, reporting each instance.

compiler.warn.unchecked.assign=\
    [unchecked] unchecked assignment: {0} to {1}
...

Mandatory notes cannot be disabled individually, they are all disabled with -Xlint:none. Unfortunately, the rest of the warnings are also disabled.

You can check other responses for alternatives, but filtering compiler output messages seems the easiest solution.