The test polygon defined in org.hibernate.spatial.testing.AbstractExpectationsFactory, POLYGON((0 0, 50 0, 100 100, 0 100, 0 0)), is invalid in the SRS 4326. The coordinates of SRS 4326 range from -180 to 180 and -90 to 90, respectively. This means that (100 100) is an invalid point in the SRS.

A valid polygon would be, for example, POLYGON ((0 0, 50 0, 50 45, 0 45, 0 0))