How are you accessing the page. If using a browser, you need to ask it to accept the server's self-signed (untrusted) certificate.
If you are using a java client, you need to specify the truststore and truststorepassword as follows.
# java -Djavax.net.ssl.trustStore=<install-dir>/glassfish/domains/domain1/config/cacerts.jks -Djavax.net.ssl.trustStorePassword=changeit myclient
Where myclient is the client class name and the truststore location and password are the default values.
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http://forums.java.net/jive/thread.jspa?messageID=391433