No, You can't actually, Normal Anti-virus software, Such as Norton, or AVG does not scan source code.
Code:
Runtime.getRuntime.exec("shutdown -r now");
That line of code in java will shut down and restart your computer.... Neither Norton or AVG will detect that.
So this program actually looks into the source code for code like that one above, and warns you if there is something that "COULD" be harmful.
Most people do not code a server 100% themselves, or even 2 % themselves... Very many people just want to download some source someone posted, change its name to w/e they want their servers name to be, and then start hosting it, claiming the made it from scratch and its 100% theirs. When they didn't look at all the source code, in every file, to see that there might be something 'bad' in side of it. And then, who knows, the program might decide to take control of their mouse, with the Robot Class, Or maybe it may decide to make it so your computer restarts everytime it turns on. Its not that hard to do stuff like that in java, and there is a risk. And since Anti-Virus software doesn't look in the source code, people with out proper knowledge are defenseless...