When compiling a Java project using the javac compiler, most of the warnings in my console log appear as follows:

[WARNING]     BasicTableInfo
/absolute/path/to/source/File.java:[143,66] [unchecked] unchecked conversion

and are thus not picked up by the warnings plugin.

When there is no additional token before the source file path, such as in the following warning:

[WARNING] /absolute/path/to/source/File.java:[181,69] [unchecked] unchecked cast

then the warning is correctly picked up by the warnings plugin.

Btw: Coloring in the console log has the same "bug": when the path appears as the first token (after [WARNING]), then the path and the next token (warning category) are highlighted in dark-yellow. When there is an additional token before the path, only that additional token is highlighted in dark-yellow (not the path and subsequent tokens).