[SOLVED] Java IDE Issues some strange version error

BW-userx · 05-08-2018, 10:00 AM

I got Java installed. To day decided to give my hand at trying some Java Programming. Installed two separate IDE's for Java, Greenfoot, first, and it did not work, so I installed NetBeens next, ( slackbuild via its web sight) it too is giving me the same error.

greenfoot error

Code:

$ ./greenfoot
Exception in thread "main" java.lang.UnsupportedClassVersionError: bluej/Boot : Unsupported major.minor version 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:442)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:64)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:354)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:348)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:347)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:312)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

Unsupported major.minor version 52.0

NetBeans error

Code:

userx@slackwhere101:/media/projects/greenfootIDE/greenfoot
$ netbeans
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/openide/filesystems/FileUtil : Unsupported major.minor version 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
	at org.netbeans.JarClassLoader.doLoadClass(JarClassLoader.java:311)
	at org.netbeans.ProxyClassLoader.selfLoadClass(ProxyClassLoader.java:259)
	at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:187)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at org.netbeans.core.startup.CLIOptions.cli(CLIOptions.java:159)
	at org.netbeans.core.startup.CLIOptions.cli(CLIOptions.java:98)
	at org.netbeans.CLIHandler.notifyHandlers(CLIHandler.java:234)
	at org.netbeans.CLIHandler.initialize(CLIHandler.java:519)
	at org.netbeans.CLIHandler.initialize(CLIHandler.java:384)
	at org.netbeans.MainImpl.execute(MainImpl.java:193)
	at org.netbeans.MainImpl.main(MainImpl.java:85)
	at org.netbeans.Main.main(Main.java:83)

Unsupported major.minor version 52.0

Code:

$ echo $JAVA_HOME
/usr/lib64/openjdk

$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/games:/opt/blender:/usr/lib64/kde4/libexec:/usr/lib64/openjdk/bin:/usr/lib64/openjdk/jre/bin:/usr/lib64/qt/bin:/usr/lib64/qt5/bin:/usr/share/texmf/bin:/sbin:/usr/sbin


$ javac -version
javac 1.7.0_171

anyone have a cue to what it is trying to tell me, so I can fix it?

what, I need 1.8x or something?

keefaz · 05-08-2018, 10:45 AM

Output of java -version ?

Did you install other java packages?

BW-userx · 05-08-2018, 10:57 AM

Quote:

Originally Posted by keefaz

Output of java -version ?

Did you install other java packages?

not that I know of, I actually didn't even know I had java installed. crazy as that sounds. java version is posted. it is the last line in the code block 2nd one.

oh never mind that was javac. 1.7 openJava.

BW-userx · 05-08-2018, 01:02 PM

reippped everything out and used Orcal sh script and installed it that way. in lue of a slackbuild.

keefaz · 05-08-2018, 04:57 PM

Never used those softwares sorry, for greenfoot they suggest to use it with Oracle JDK 8 instead of openJDK...
https://www.greenfoot.org/download/installation

BW-userx · 05-08-2018, 05:11 PM

Well my whole system went to crap. Something about a superblock issue. I'm reinstalling again and on my tablet writing this. I'll pick it up if this install works. Thanks