Hello,
I have seen this posted before, so I know there is a solution somewhere. It seems as though I have a version conflict between Java versions (compiler vs. runtime) - here is the issue, I compile a version of my test app, very simple, it compiles just fine - console application (not applet, for the moment, I am not targeting applets), I try to run it and get "Unsupported major.minor version 52.0" - I would like to run under version 1.8 - how do I fix this definitively. Don't pull punches, I want to compile targeting version 1.8 and run under version 1.8. What do I do?
This simple code fails:
code start:

public class HelloWorld
{
public static void main(String[] args)
{
System.out.println( "Hello world!");
}
}

code end
compile dump returns no error. Try to run, I get:
java HelloWorld
Exception in thread "main" java.lang.UnsupportedClassVersionError: HelloWorld : 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.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
ABRT problem creation: 'success'
What is the problem here and what are the step by step solutions for it?
Thanks

Your JDK and JRE might be of different versions. Try commands like these:

okay, here is what I have:
javac -version
javac 1.8.0_05

java -version
java version "1.7.0_60"
OpenJDK Runtime Environment (fedora-2.5.0.1.fc20-x86_64 u60-b30)
OpenJDK 64-Bit Server VM (build 24.60-b09, mixed mode)

Does this help?
Thanks

Well, then find a way(*) that the two versions be the same.
Or, alternatively try and compile with these options:

(*) Via installing/updating packages, setting/changing environment variable PATH and JAVA_HOME, creating symlinks or whatnot. Ask your sysadmin for help.

Note: if you have JDK installed, it has a JRE in it, use that.

Thanks.
That worked for the simple code, but, the real code won't compile under 1.4, where do I get the *right* versions so the compiler and the runtime work together?
Thanks again.

Kindly read the last parts of my previous post.