This module is licensed as GPL3+classpath exception:

Linking this library statically or dynamically with other modules is making a
combined work based on this library. Thus, the terms and conditions of the GNU
General Public License cover the whole combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules, and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms and
conditions of the license of that module. An independent module is a module
which is not derived from or based on this library. If you modify this library,
you may extend this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this exception
statement from your version.

In addition, binaries with stable version numbers (no -alpha, -beta, or CI
binaries) released by the author are also released with the the GCC Exception
version 2.0 added to the license:

In addition to the permissions in the License, the author(s) gives you
unlimited permission to link the compiled version of this file into
combinations with other programs, and to distribute those programs without any
restriction coming from the use of this file. (The General Public License
restrictions do apply in other respects; for example, they cover modification
of the file, and distribution when not linked into another program .)