Forums > Java

can not make mxj work……

Jun 25 2010 | 1:53 pm

I have java issue;
I try to use mxj msa fluid for instance, or jitter.balls from efe ( )…
But everytime the same answer from my dear friend max:

• error: java.lang.UnsupportedClassVersionError: Bad version number in .class file
• error: at java.lang.ClassLoader.defineClass1(Native Method)
• error: at java.lang.ClassLoader.defineClass(
• error: at com.cycling74.max.MXJClassLoaderImpl.doLoadClass(
• error: at com.cycling74.max.MXJClassLoader.loadClazz(
• error: Could not load class ‘Ball’

Although I put the class in the classes folder… maybie my java file is not at the same place… 
I am on Leopard 10.5…
Any suggestions ?

Jun 26 2010 | 1:16 pm

Hello Ad.
some questions:
have you installed the developer tools on your mac?
which version of java do you have?, you can check that information by opening your terminal and typing:
java -version
are you using any IDE like eclipse to compile your classes?
can you load any of the classes available on max?


Jun 28 2010 | 9:06 am

Hello efe;
Yes I have installed Xcode 3.1.
java version: "1.5.0_19"
I compile my classes with javac.

Yes I can load classes in max (now…).
Weird point anyway: When I type "mxj now", it doesn’t work… But when I open the now helpfile, the mxj is correctly loaded…here’s maybie one clue of that issue…
Thx for your concern (is that English ? :) )

Jun 28 2010 | 5:40 pm

Emmanuel, are you compiling with java 6? Cause that’s what that error would indicate to me.

Jun 28 2010 | 10:51 pm

Yeah, 6

Jun 29 2010 | 11:51 am

Yep, update works for balls ! Thx.
Although I still have a problem with msa fluid.

here’s my terminal compilation:
javac -classpath /Applications/Max5/Cycling ’74/java/lib/MSAFluid.jar

Is this correct ?

Sorry for this non-interesting issue, I’m really beginner in this field


Jun 29 2010 | 2:32 pm

hello Ad.
If you are planning to add more than one jar you will need multiple paths. Herewith a small example. You should type on the terminal in order to compile this small(rather useless) class:
javac -classpath /Applications/Max5/Cycling ’74/java/lib/max.jar:/Applications/Max5/Cycling ’74/java/lib/jitter.jar

Notice that they are separated by : and I am including both max and jitter files.
In your case I guess you will need to add the MSAFluid.jar and then compile.

However, I would suggest you to use the terminal just for small tests and move to a proper IDE in order to make bigger projects; that is much easier and allows binding multiple jars and inherit from classes. I use Eclipse but I am sure it is possible to develop mxj projects with XCode(they removed, somehow, the java templates) and NetBeans

Let me know how it goes



Jul 01 2010 | 6:33 am

Thx Efe.
No problem for your window js.

I’ll try to compile my fluid issue in Eclipse.
Which is sure is that I have several errors in my fluid simulation java file…

I have to make Mark Dexter a friend. I’ll tell you about that, it ‘s going to take me a little bit time!

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Forums > Java