I currently have java version of 1.8 but i want to make a Runnable jar file of version 1.7 through eclipse because i'm not able to execute the generated jar file of version 1.8 on the server. So that, I want to downgrade the version of the jar file. Please tell me some steps to do it.
Change your java compilation version on project level to Java 1.7 and then make jar from eclipse:
Go to project setting Right click -> Properties