Resolving the Java command by the Wrapper is generally a good option, as it will help you to point out and start troubleshooting easily missettings on the environment leading to unexpected behaviour when starting your application with the Wrapper. However, on some UNIX distributions a JVM can be started not only with the "java" command but also by small helper applications, e.g. run-java-tool on Gentoo Linux. However this application might only allow to get called via a symbolic link to them.