I could solve the same problem using the below solution.
In my project, I added a JAR file which were created in Java 8. And my project was referring to JRE 7. When I changed project JRE to 8, my problem was solved.
Steps:
In Eclipse, right click on the project name in project explorer → Build path → Libraries → click on JRE version → click Edit → Installed JRE → Add → Standerd VM → select JRE home click-path (path should be localePath\java\jdk1.8.0_25\jre) → provide name → Save → select same JRE for project → Finish → OK. Refresh/build project once → try to run your Java file. It should work.
