swing and javafx support on linux

Question

I have created a project on java swing using javafx controls as well. Now I m trying to run my project on Linux but its showing unsupported class version that I understood. Now I am trying to compile the class files then its showing a lot of errors even its not supporting to java swing classes . I have installed jre1.7.0 on my Linux user
directory. should I install any other java version also. A simple program for just printing on the screen is running smoothly.