the following resource is signed with a weak signature algorithm md5withrsa

So, after some digging, I just found a quick (but temporary) solution:

Just comment out the setting of “jdk.jar.disabledAlgorithms” in the file of”lib/security/java.security” (which is located at “/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/security/java.security, on my MacOS 10.12)

# jdk.jar.disabledAlgorithms=MD2, MD5, RSA keySize < 1024

After that, the JNLP file will be running as usual again.