The WAS_HOME environment variable must be setup. It should be set to the server directory of the WebSphere Application Server installation (e.g. /opt/IBM/WebSphere/AppServer).
On Oracle Solaris the preference order of security providers in $JAVA_HOME/java/jre/lib/security/java.security must be changed. Provider com.ibm.security.jgss.IBMJGSSProvider must be moved from position 1 into position after com.ibm.jsse2.IBMJSSEProvider2 in the list of providers. This must be done to support secure web services.