Java.lang.UnsupportedClassVersionError:Bad version number in. class file

Java.lang.UnsupportedClassVersionError:Bad version number in. class file
This fault is caused by NI's support for the JDK version of Tomcat running that is inconsistent with the JDK version that supports application running.
Change their JDK version to the same steps as follows:
1.Window--Preferences-->java--and compiler in the compiler compliance level, select the JDK version in the drop-down menu.
2.Window--Preferences-->myeclipse---Servers-->tomcat-a drop-down menu under Tomcat JDK name in Tomcat n.x-->JDK Select the JDK version installed on your PC (required to match the JDK version in step 1).

Java.lang.UnsupportedClassVersionError:Bad version number in. class file