I want to know that can I integrate and develop applications on asterisk with java (is the java support deprecated in asterisk now? )

I am not able to find asterisk-java site on the internet now(

I am not aware that Asterisk ever had any specific Java support. Asterisk provides the AMI interface and third parties provide class libraries, etc., for various programming languages.

I guess whoever ran the site gave up. Java may be de facto no longer supported, but I don’t think it ever had a sufficiently official status that it could then be deprecated.