Very simple problem with my first "Hello World" Java code
<p>I saved this code in FirstApp.java:</p>

<pre><code>class FirstApp {
    public static void main (String[] args) {
        System.out.println("Hello World");
    }
}
</code></pre>

<p>Then this is what I get when trying to compile and run:</p>

<pre><code>$ javac FirstApp.java
$ java FirstApp
Exception in thread "main" java.lang.UnsupportedClassVersionError: FirstApp : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
    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$1.run(URLClassLoader.java:212)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: FirstApp. Program will exit.
</code></pre>

<p>What I am doing wrong?</p>
