Install JDBC Drivers - Installing Java Classes
13.2.1.3. Installing Java Classes You have to be a super-user with required privileges to install Java classes. The JAR file you are trying to install should be created without compression. Java classes that you install and use in the server must be compiled with JDK 1.2.2. If you compile a class with a later JDK, you will be able to install it in the server using the installjava utility, but you will get a java.lang.ClassFormatError exception when you attempt to use the class. This is because Sybase Adaptive Server uses an older JVM internally, and requires the Java classes to be compiled with the same.