test/javax/net/ssl/etc/keystore is used a lot for X.509 cert based SSL/TLS authentication. MD5 and SHA1 are used as the signature algorithms. The key size of EC certs is 192 bits.
MD5 has been disabled, and 192-bits EC keys will be disabled in the near future(see JDK-8148516). It's time to use stronger algorithms (SHA256) and keys (2048-bits for RSA/DSA and 256-bits for EC)