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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 15:54:08 +0300

Can you do the ls command of your development machine on which you're trying to install JDK 1.5?

The folder is under /System/Library/Frameworks/JavaVM.framework

lrwxr-xr-x  1 root  wheel    5 10 Dec  2009 1.3 -> 1.3.1
drwxr-xr-x  3 root  wheel  102 21 Jul  2009 1.3.1
lrwxr-xr-x  1 root  wheel   10 10 Dec  2009 1.4 -> CurrentJDK
lrwxr-xr-x  1 root  wheel   10 10 Dec  2009 1.4.2 -> CurrentJDK
lrwxr-xr-x  1 root  wheel   10 10 Dec  2009 1.5 -> CurrentJDK
lrwxr-xr-x  1 root  wheel   10 10 Dec  2009 1.5.0 -> CurrentJDK
lrwxr-xr-x  1 root  wheel    5 10 Dec  2009 1.6 -> 1.6.0
drwxr-xr-x  8 root  wheel  272 15 Apr 13:18 1.6.0
drwxr-xr-x  9 root  wheel  306 15 Apr 13:18 A
lrwxr-xr-x  1 root  wheel    1 10 Dec  2009 Current -> A
lrwxr-xr-x  1 root  wheel    3 27 Apr 22:25 CurrentJDK -> 1.6

The problem you're specifying is very strange as it's not required to install JDK/JRE 1.5 to compile the code for 1.5. Can you share the snapshot of your eclipse > preferences > java > compiler screen. Also make sure the the project's compiler settings are not overriding eclipse global compiler settings.

Farrukh


On 2010-06-14, at 3:35 PM, Jake Bearkley wrote:

Thanks, but as I have said, I have changed the preference and I still get the error.

What else can I do to eliminate the error?

I use no java 1.6 code.  The application is currently being developed on a Leopard environment with java 1.5 and I am trying to set up a new development machine.

Thanks in Advance
Bearko


On Mon, Jun 14, 2010 at 9:43 PM, Farrukh Ijaz <email@hidden> wrote:
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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References: 
 >java.lang.UnsupportedClassVersionError: Bad version number in .class file (From: Jake Bearkley <email@hidden>)
 >Re: java.lang.UnsupportedClassVersionError: Bad version number in.class file (From: Farrukh Ijaz <email@hidden>)
 >Re: java.lang.UnsupportedClassVersionError: Bad version number in.class file (From: Jake Bearkley <email@hidden>)

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