Problem: If try to use field of type "java.sql.Types.BIT" obtains error "Unknown Types Value" Resolution: Add this: PreparedStatement.java 460,461d459 < case Types.BIT: < set(parameterIndex, ((Boolean)x).booleanValue() ? "true" : "false"); Jose A. Matute Calvo Daratel, S.L. Zaragoza - Spain.