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Re: java.lang.UnsupportedClassVersionError: Bad version number in.class file
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Re: java.lang.UnsupportedClassVersionError: Bad version number in.class file


  • Subject: Re: java.lang.UnsupportedClassVersionError: Bad version number in.class file
  • From: Farrukh Ijaz <email@hidden>
  • Date: Mon, 14 Jun 2010 15:13:30 +0300

Thats fine! JDK 1.6 compiler can generate code compatible to JDK 1.5. The message is for the target system. I've the same scenario where I have applications in production running on PPC platform 1.5 but I've on my Macbook 1.6.

However you may find error if you're having code of 1.6 which is not compatible to 1.5. In that case you need to change it with 1.5 compatible code. But chances are very rare you get an error.

Farrukh

On 2010-06-14, at 3:01 PM, Jake Bearkley wrote:

Hi All,

I have done that :) but I still get the error

when I select 1.5 as the compiler compliance level, a message appears at the bottom
"When selecting 1.5 compliance, make sure to have a compatible JRE installed and activated (currently 1.6)"

but I can not install and activate 1.5 JRE because the directory is dimmed when I try and add the JRE!!!


Cheers
Bearko



On Mon, Jun 14, 2010 at 9:24 PM, Farrukh Ijaz <email@hidden> wrote:
Eclipse > Preferences > Java > Compiler

Set it to Java 1.5 before compiling.

You can do the similar setup per project.

Farrukh

On 2010-06-14, at 2:51 PM, Jake Bearkley wrote:

> HI All,
>
> I am trying to build an application on Snow Leopard with Java 1.6 and run on a Leopard server with Java 1.5
>
> Can someone give me guidance on how to do this.
>
> Java 1.5 is a symbolic link to 1.6 on the file system
>
> Within eclipse I have attempted to set the Workspace settings to use 1.5, to do this I also need to set the System JRE.
>
> I am unable to install JRE for 1.5, when I try to install it, I am unable to select the 1.5 directory as it is dimmed.
>
> can anyone enlighten me?
>
> Thanks in advance
> Bearko
>
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