How can I create a CSR without a warning message from the keytool command?

Issue

When creating a CSR to enable one-way SSL/TLS for Applications in JBoss EAP 7, the following warning message is shown from keytool command. How can I create a keystore without the warning message?

$ keytool -genkeypair -keystore server.jks -dname "CN=test.support.redhat.com, O=Red Hat, C=JP" -alias server -keyalg RSA -keysize 2048 -validity 365

Warning:
The JKS keystore uses a proprietary format. It is recommended to migrate to PKCS12 which is an industry standard format using "keytool -importkeystore -srckeystore server.jks -destkeystore server.jks -deststoretype pkcs12".

$ keytool -certreq -keystore server.jks -alias server -file server.csr -ext SAN="DNS:test.support.redhat.com,DNS:www.test.support.redhat.com"

Warning:
The JKS keystore uses a proprietary format. It is recommended to migrate to PKCS12 which is an industry standard format using "keytool -importkeystore -srckeystore server.jks -destkeystore server.jks -deststoretype pkcs12".