Starting of server wildfly in debug mode has timed-out

Calling "C:\wildfly-servlet-11.0.0.Final\bin\standalone.conf.bat"
"JAVA_OPTS already set in environment; overriding default settings with values: -Xms128m -Xmx512m -XX:MaxPermSize=256m -Djava.net.preferIPv4Stack=true -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true"
Setting JAVA property to "C:\Program Files (x86)\Java\jdk1.7.0_15\bin\java"
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  JBoss Bootstrap Environment

  JBOSS_HOME: "C:\wildfly-servlet-11.0.0.Final"

  JAVA: "C:\Program Files (x86)\Java\jdk1.7.0_15\bin\java"

  JAVA_OPTS: "-client -Dprogram.name=standalone.bat -Xms128m -Xmx512m -XX:MaxPermSize=256m -Djava.net.preferIPv4Stack=true -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true"

===============================================================================

java.lang.UnsupportedClassVersionError: org/jboss/modules/Main : Unsupported major.minor version 52.0
 at java.lang.ClassLoader.defineClass1(Native Method)
 at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
 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$1.run(URLClassLoader.java:355)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
 at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Exception in thread "main"