As shown in the following example, you can use the USER_INSTALL_ROOT variable as part of the path name: {USER_INSTALL_ROOT}/etc/ws-security/samples/intca2.cer. This X.509 certificate path is not for production use. Obtain your own X.509 from a certificate authority before putting your WebSphere Application Server environment into production.
You can configure the USER_INSTALL_ROOT variable in the administrative console by clicking Environment > WebSphere Variables.