Fixed: On Firebird 3 and 4 with WireCrypt = Enabled , the connection could hang or throw exceptions like "Unsupported or unexpected operation code". (JDBC-599)

Jaybird 3.0.8 has been released. This release contains one bug fix:Jaybird 3.0 supports Firebird 2.0 and higher, on Java 7, 8, 11 and 13. Basic Java 9 and higher compatibility is provided through the Java 8 version of the driver.See also: