Java keytool

• Download the CA certificate from the proxy and convert it to PEM format:

  /usr/java/default/bin/keytool -import -trustcacerts -file  -alias CA_ALIAS -keystore /usr/java/default/lib/security/cacerts -storepass changeit
  

More:

• The Most Common Java Keytool Keystore Commands – http://www.sslshopper.com/article-most-common-java-keytool-keystore-commands.html
• keytool – Key and Certificate Management Tool – http://docs.oracle.com/javase/1.4.2/docs/tooldocs/windows/keytool.html