java.lang.UnsupportedClassVersionError: com/google/doclava/Doclava : Unsupported major.minor version 51.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
	at com.sun.tools.javadoc.DocletInvoker.<init>(DocletInvoker.java:96)
	at com.sun.tools.javadoc.Start.setDocletInvoker(Start.java:414)
	at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:213)
	at com.sun.tools.javadoc.Start.begin(Start.java:162)
	at com.sun.tools.javadoc.Main.execute(Main.java:59)
	at com.sun.tools.javadoc.Main.main(Main.java:49)
javadoc: error - fatal error
1 error
make: *** [/home/djmatt604/dev/brokenpop/out/target/common/docs/api-stubs-timestamp] Error 45
make: *** Waiting for unfinished jobs....