Groups > comp.lang.java.programmer > #30995

Re: catch unsupported class version error

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From	v_borchert@despammed.com (Volker Borchert)
Newsgroups	comp.lang.java.programmer
Subject	Re: catch unsupported class version error
Date	2 Feb 2015 00:29:42 GMT
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Arne Vajh??j wrote:
> On 2/1/2015 5:49 PM, Philipp Kraus wrote:
> > because within the source I use some 1.8 features e.g. thread-stealing pool.
> >
> > If I run the Jar on a version < 1.8 I get the error "unsupported
> > major.minor version" with a stacktrace.
> >
> > IMHO I cannot catch the error, because it is thrown by a native method
> > of the VM, I have found a solution,
> >
> > that I can compile a class with e.h. 1.7 option and check the running
> > version of the VM and create an error
> >
> > message on a wrong version.
> >
> > I would like to create error like "You are need Java 1.8" and the user,
> > which run's the Jar does not see the stacktrace.
> >
> > How can I do check the VM version and create a nice error message?
> 
> Maybe:
>     System.getProperty("java.version")

What about 

	try {
	  Class.forName("some.class.compiled.with.1_8")
	} catch (UnsupportedClassVersionError e) {
	  ...
	} catch (ReflectiveOperationException e) {
	  ...
	}

-- 

"I'm a doctor, not a mechanic." Dr Leonard McCoy <mccoy@ncc1701.starfleet.fed>
"I'm a mechanic, not a doctor." Volker Borchert  <v_borchert@despammed.com>

Thread

catch unsupported class version error Philipp Kraus <philipp.kraus@flashpixx.de> - 2015-02-01 23:49 +0100
  Re: catch unsupported class version error Arne Vajhøj <arne@vajhoej.dk> - 2015-02-01 18:00 -0500
    Re: catch unsupported class version error v_borchert@despammed.com (Volker Borchert) - 2015-02-02 00:29 +0000
      Re: catch unsupported class version error Arne Vajhøj <arne@vajhoej.dk> - 2015-02-01 21:26 -0500
  Re: catch unsupported class version error Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2015-02-02 06:53 +0000

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