PHP vs. Java. vs. Perl vs. Ruby

Java still is the hottest programming language searched for (even compared to C++, python, etc.), and that was quite to my surprise. May be Java is not only used in the web development world and I feel this is why it is on top. I can't remember the last time I saw an applet and I don't see much of Java questiosn in web development forums i visit, but stats say it. I feel the interesting part about this graph is that PHP still reigns in internet scripting world, don't see much of Perl and Ruby hardly shows any trend.
Click here to see the graph