To get started with Java on Fedora 8, I installed
java-1.7.0-icedtea-devel - 18.104.22.168-0.19.b21.snapshot.FC8.i586
as well as BlueJ using the .jar file from it's website.
Used this command to start the BlueJ installation:
This worked fine and the installation linked to
/usr/lib/jvm/java-1.7.0-icedtea-22.214.171.124 as the JDK directory.
Loaded up BlueJ, imported the first project from the CD that came with
the book. Creating new objects were no problem
at all. However, as soon as I tried to invoke a method, I got this
Here's a screenshot of BlueJ and the error as well:
Java and Javac version match: http://pastebin.com/m2063432d
The Java compiler can generate bytecode for different/older java runtimes.
In this case the compiler has generated code that the runtime is unable to
The compiler has a setting you can change. In the Eclipse IDE it is
Preferences/Compiler/JDK compliance. Typically there will be a similar
feature in BlueJ. It may be an option you can set via the GUI, or the IDE
may allow you to pass command line parameters to the compiler.
I'd suggest the highest setting (Java 5 or 6)