java8 requirement for kawa 2.1

java8 requirement for kawa 2.1

[Debabrata Pani]

Hi Per,
Is java 8 mandatory for kawa 2.1 ? Can I recompile a jar with java 7?
(my svn update failed and hence not sure)
I was getting the unsupported class version error when i tried the
following command

java -jar ~/Downloads/kawa-2.1.jar

Exception in thread "main" java.lang.UnsupportedClassVersionError:
kawa/repl : 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)


Regards,
Debabrata Pani

Re: java8 requirement for kawa 2.1

[Per Bothner]

On 10/28/2015 07:24 AM, Debabrata Pani wrote:
> Hi Per,
> Is java 8 mandatory for kawa 2.1 ?

The code checked in the Subversion should build with Java 7 as-is.
It can be pre-processed to compile work with Java 6.
It can also be pre-processed to enable some extra features for Java 8.

At least, that's how it's supposed to work.

The kawa-2.1.jar is *supposed* to run on Java 7, but I'm guessing
I make a mistake and built it on Java 8 (without the proper -target option);
I was in a hurry when I made the release.

>Can I recompile a jar with java 7?

You can't re-compile the jar.  You should be able to compile the
source code - kawa-2.1.tar.gz - with Java 7.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/

Re: java8 requirement for kawa 2.1

[Debabrata Pani]

>> Can I recompile a jar with java 7?
>
>
> You can't re-compile the jar.  You should be able to compile the
> source code - kawa-2.1.tar.gz - with Java 7.

Yes , I meant to say the same :-P
But yes the current version has been compiled with java 8 (without the
-target option, as you say)

Regards,
Debabrata Pani



On Wed, Oct 28, 2015 at 10:16 PM, Per Bothner <per@bothner.com> wrote:
>
>
> On 10/28/2015 07:24 AM, Debabrata Pani wrote:
>>
>> Hi Per,
>> Is java 8 mandatory for kawa 2.1 ?
>
>
> The code checked in the Subversion should build with Java 7 as-is.
> It can be pre-processed to compile work with Java 6.
> It can also be pre-processed to enable some extra features for Java 8.
>
> At least, that's how it's supposed to work.
>
> The kawa-2.1.jar is *supposed* to run on Java 7, but I'm guessing
> I make a mistake and built it on Java 8 (without the proper -target option);
> I was in a hurry when I made the release.
>
>> Can I recompile a jar with java 7?
>
>
> You can't re-compile the jar.  You should be able to compile the
> source code - kawa-2.1.tar.gz - with Java 7.
> --
>         --Per Bothner
> per@bothner.com   http://per.bothner.com/