Compile with at least Java 1.5 instead of Java 1.6 about openextern HOT 9 OPEN

[deleted comment]

Still Java 1.6, You can see it in the Manifest file.

I don't see that, what i must change in manifast file?

In Your Manifest.MF of the Plugin it shows the following line:

Created-By: 1.6.0_03-b05 (Sun Microsystems Inc.)

This tells me, that the plugin is still compiled with Java 1.6.
You need to set the JDK You are Using for this plugin to a version of Java 1.5.

[deleted comment]

I use java 1.6, but compilance level is 1.5. 

Now (in version 1.0.3) i use java 1.5, and remove java 1.6 from eclipse 
preference,
but in Manifest is still: "Created-By: 1.6.0_03-b05 (Sun Microsystems Inc.)"  
???

I just checked out Your code in my workspace (everthing is set to Java 1.5) and 
exported it as plugin and now everything works well. Maybe there are still some 
settings wrong in your eclipse...

This is a .jar file with the right compiler (1.5)

Thanks, that new jar solved my problem.  The plugin supplied for installation 
is 
still broken for java 1.5.