In December of 1990, Sun Microsystems unveiled their alternative platform to C/C++ standard of the time. This revolutionary language would spearhead entirely new worlds of Personal Computer Software, remaining a contender well into the next two decades, which is unusual for start-up software languages.
It was not until 1994 that the developers redesigned the Java Platform for the Internet and shortly after the launch, popularity began to rise. It allowed webmasters to fill their sites with an unparalleled amount of dynamic and rich content, beautiful eye-candy and an entirely new platform in which to market their sites to the world.
Unfortunately, as with all products, there are some major disadvantages to using the Java platform as well.
First, depending on the level of complexity and layers within the program, Java based programs tend to run slower due to a high volume of individual classes. This is somewhat offset by the speed of modern processors and computers, but a noticeable performance gap is clearly there. Also, anything written in Java must run on it's own private run-time environment, which severely limits certain users ability to keep programs from running on their system.
While most would consider speed a lesser issue to security, it would turn out that one of Java's major complaints is it's speed problem as mentioned above. More so than security, because one of the major advantages of java is it's built in security as a platform and language itself.
In conclusion, Java is a staple of almost all PC's and software solutions, it's a grandfather technology with constant updates and continual support. Sun Microsystems knocked it out of the park with Java and I don't see it going anywhere in the near future.