Install JDBC Drivers - Special Notes on Sybase
13.2.1. Special Notes on Sybase Some of the services in JBoss uses null values for the default tables that are created. Sybase Adaptive Server should be configured to allow nulls by default. sp_dboption db_name, "allow nulls by default", true Refer to the Sybase manuals for more options. Additionally, text and image values stored in the database can be very large. When a select list includes both text and image values, the length limit of the data returned is determined by the @@textsize global variable. The default setting for this variable depends on the software used to access Adaptive Server. For the JDBC driver, the default value is 32 kilobytes.