i have a server tomcat that run correctly a project in eclipse but when i tried to run in debug it throws this error :

java.lang.UnsupportedClassVersionError: org/eclipse/jdt/launching/internal/javaagent/Premain : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:300)
    at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:397)
FATAL ERROR in native method: processing of -javaagent failed
Exception in thread "main" 

I know that should be a versioning error, the class is compiled in 1.8 and my project run in 1.7. I cannot understand this, why is working when i start the project, but for debug no ?
i attached here the config which contains the version used, if you wanna see more config please let me know. Thanks.