Gerd Wagner - 2019-08-07

Your JDBC driver seems to break when SQuirreL calls the driver's ResultSet.getWarnings() method.

Nonetheless SQuirreL's problem was that it didn't show the error that ResultSet.getWarnings() produced but an UnsupportedOperationException.
Now in the latest snapshot the right error is issued.

Unfortunately this may not solve your problem as now a different error will occur. But as mentioned above this error is due to your JDBC driver.
If you are lucky the new error tells what to do about the problem. If not please consult your driver vendor and ask him to fix the error that occurs when ResultSet.getWarnings() is called.