Testing v3.3 I got:

$ java -jar ~/Downloads/JabRef-3.3.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: 
net/sf/jabref/JabRefMain : 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)

and the java version I have is:

$ java -version
java version "1.7.0_79"
OpenJDK Runtime Environment (IcedTea 2.5.6) 
(7u79-2.5.6-0ubuntu1.14.04.1)
OpenJDK Server VM (build 24.79-b02, mixed mode)

I do not know about others, but I will not be able to update java to v8 
on my government laptop for some time to come.

   EBo --

On Apr 19 2016 4:46 AM, Marisano James wrote:
> Yes, I believe under Ubuntu14.04 you're going to need to make sure 
> you've
> got Java 8 installed / it's being invoked to launch JabRef.
>
> On Tue, Apr 19, 2016 at 3:09 AM, Frédéric Darboux <
> frederic.darb...@orleans.inra.fr> wrote:
>
>> Le 19/04/2016 à 11:48, Wenqiang Liu a écrit :
>> > Dear everyone,
>> >
>> > I just downloaded the 3.3 jar package. I have two questions here, 
>> could
>> > you please help me?
>> >
>> > [...]
>> > 2. I tried run JabRef-3.3.jar on Ubuntu 14.04LTS, but first it 
>> prompted
>> > one error with something like this jar is not executable. After I 
>> run
>> > chmod +x JabRef-3.3.jar, it gave another error saying “cannot 
>> execute
>> > binary file”. I am wondering what should I do to run 
>> JabRef-3.3.jar
>> > correctly on Ubuntu?
>>
>> First, can you try the following command line?
>>         java -jar JabRef-3.3.jar
>>
>> Does it work?
>> If not, please, provide the version of Java
>>         java -version
>>
>>
>> Cheers.
>>
>> Frédéric
>>
>>
>>
>>
>> >
>> > Thanks very much in advance!
>> >
>> >
>> >
>> > With My Best Regards
>> >
>> > Liu
>> >
>> >
>> >
>> >
>> 
>> ------------------------------------------------------------------------------
>> > Find and fix application performance issues faster with 
>> Applications
>> Manager
>> > Applications Manager provides deep performance insights into 
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>> >
>> >
>> >
>> > _______________________________________________
>> > Jabref-users mailing list
>> > Jabref-users@lists.sourceforge.net
>> > https://lists.sourceforge.net/lists/listinfo/jabref-users
>> >
>>
>> --
>> .......................................................
>> Research Scientist - INRA (French National Institute for 
>> Agricultural
>> Research)
>> Laboratoire Sols et Environnement (UMR 1120 LSE)
>> Ensaia - 2 avenue de la Forêt de Haye
>> TSA 40602 - 54518 Vandoeuvre-lès-Nancy - France
>> Tel: +33 (0)3 83 59 57 68. Also: +33 (0)3 83 39 41 47
>> <http://lse.univ-lorraine.fr/>
>>
>>
>> 
>> ------------------------------------------------------------------------------
>> Find and fix application performance issues faster with Applications
>> Manager
>> Applications Manager provides deep performance insights into 
>> multiple
>> tiers of
>> your business applications. It resolves application problems quickly 
>> and
>> reduces your MTTR. Get your free trial!
>> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
>> _______________________________________________
>> Jabref-users mailing list
>> Jabref-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/jabref-users
>>
>
> 
> ------------------------------------------------------------------------------
> Find and fix application performance issues faster with Applications 
> Manager
> Applications Manager provides deep performance insights into multiple 
> tiers of
> your business applications. It resolves application problems quickly 
> and
> reduces your MTTR. Get your free trial!
> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
>
> _______________________________________________
> Jabref-users mailing list
> Jabref-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/jabref-users


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reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
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