Using Mogre with Java

Hello together,

right now im experimenting how to develop Mogre based Applications with Java. For this i use the ikvm java virtual machine. The ikvm project provides tools for generating java stubs with which you can call .NET assemblies from java.

I wrote a minimal test application in java that tries just to create an Ogre Root object (i put the java classes directly in the OgreSDK/bin/release folder). The rather simple code is shown below:

package test;

import cli.Mogre.Root;

public class Test {

public static void main(String[] args) {
new Root();
}

}


When i now try to run my little application out of the OgreSDK/bin/release folder i get the following exception:

Could not load file or assembly 'Mogre, Version=0.1.7.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies.

However everything works as expected when i use the .NET Console as follows:

package test;

import cli.System.Console;

public class Test {

public static void main(String[] args) {
Console.get_Out().Write("test");
}

}

Im a little bit confused here since i started my application right out of the bin/release folder and thought the appropriate Mogre dlls should be found... The next thing i tried was to install the Mogre.dll in the .NET assembley cache but this failed with the following error:

Unable to add the selected assembly. The assembly must have a strong name (name, version and public key).


Im a little bit stucked here since i dont know .NET enough. Does anybody have an idea where the problem might lie?

thanks in advance,

David

Whoa, cool project! I downloaded ikvmbin-0.30.0.0.zip but when I execute "ikvmstub mogre.dll' I get:System.BadImageFormatException: The format of the file 'mogre.dll' is invalid.
How did you produce the stubs?


You may be interested to know that there is a java wrapper for Ogre: http://ogre4j.org

Hm i dont get that error. What .NET version do you use?

My output looks like this:

schmelly@workstation /cygdrive/d/Programme/OgreSDK/bin/release
$ ikvmstub.exe Mogre.dll
Skipping: Mogre.Pair`2


I know about Ogre4J thanks. But i think it would be great to be able to integrate Java with .NET, especially for tool development. Since im mainly developing in Java im missing Frameworks like EMF or GMF

www.eclipse.org/emf
www.eclipse.org/gmf


David

PS: if you arent able to generate the required java stubs i could send them to you via mail

Mogre requires .NET 2.0, are you trying to use it with Mono ?

no im using Microsoft .NET 2.0

Ah, I have 1.1 installed too so I needed to do this.

Hey, it worked for me. Do the demos execute fine?

IKVM is cooler than a frozen escimoe! What are its limitations (it doesn't handle .NET generics, right ?)

did you start a java application with ikvm or did you create .net assemblies from the java .class files?

im not able to run a java program with ikvm and ogre classes...

did you start a java application with ikvm or did you create .net assemblies from the java .class files?
Both succeeded. But my java skills are rusty and I couldn't make ikvm find the Test class without removing the package declaration:
import cli.Mogre.Root;

public class Test {

public static void main(String[] args) {
new Root();
}

}

hm strange

i get the same exception as shown in the first post...


did you install your *ogre.dlls in the assembly cache?

Try adding 'c:\OgreSDK\bin\release' to the PATH environment variable.

If you still get the exception, execute this file from inside the bin\release directory and let me know if it runs ok or not.

same error for the java app the example apps work ok

Exception in thread "main" java.lang.NoClassDefFoundError: cli.Mogre.Root (Could not load file or assembly 'Mogre, Versi
on=0.1.7.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Das System kann die angegebene Datei nicht
finden.)
at IKVM.NativeCode.java.lang.VMClassLoader.defineClassImpl(Unknown Source)
at java.lang.VMClassLoader.defineClassImpl(VMClassLoader.java)
at java.lang.VMClassLoader.defineClassWithTransformers(VMClassLoader.java:105)
at java.lang.ClassLoader.defineClass(ClassLoader.java:468)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
at java.net.URLClassLoader.findClass(URLClassLoader.java:617)
at java.lang.ClassLoader.loadClass(ClassLoader.java:342)
at java.lang.ClassLoader$1.loadClass(ClassLoader.java)
at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
at IKVM.Internal.ClassLoaderWrapper.LoadClassImpl(Unknown Source)
at IKVM.Internal.ClassLoaderWrapper.LoadClassByDottedNameFastImpl(Unknown Source)
at IKVM.Runtime.ByteCodeHelper.LoadTypeWrapper(Unknown Source)
at IKVM.Runtime.ByteCodeHelper.DynamicNewCheckOnly(Unknown Source)
at test.Test.main(Test.java:13)

Ok I found the problem. For some reason, the IKVM binaries need to be in 'C:\OgreSDK\bin\release' folder too.
I had copied the IKVM binaries there from the start and it worked. When I tried to run IKVM from another directory I got the exception that you get.

ahhhh the ikvm.exe as well...

this is a bit weird but hey, expect some neat eclipse integration in the future


thank you Bekas!

i just ported the minimal application from the wiki sucessfully to java (without framelistener support for now)

this rocks