Re: compile java7 classes on linux

Thanks Jeroen, 


Of course, this is the exact idea: to run java code on linux, using Mono.
The problem is that linux ikmv compiler (IKVM.NET Compiler version 0.46.0.1) cannot handle .class files having class format 51.0 (compiled with JDK 7).

I noticed that the ikvm interpreter fails to load such classes (TestApp2 was compiled with javac 1.7.0_04):
$ ikvm -cp lib/someJava7Lib.jar:. TestApp2

Exception in thread "main" java.lang.UnsupportedClassVersionError: TestApp2 (51.0)
at IKVM.NativeCode.java.lang.ClassLoader.defineClass1(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:139)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:232)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:208)
at java.security.AccessController.doPrivileged(AccessController.java:269)
at java.security.AccessController.doPrivileged(AccessController.java:520)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java)
at java.lang.ClassLoader.loadClass(ClassLoader.java:280)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:348)
at IKVM.Internal.ClassLoaderWrapper.LoadClassImpl(Unknown Source)
at IKVM.Internal.ClassLoaderWrapper.LoadClassByDottedNameFastImpl(Unknown Source)
at IKVM.Internal.ClassLoaderWrapper.LoadClassByDottedName(Unknown Source)
at IKVM.NativeCode.java.lang.Class.forName0(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java)


Regards,
    Ovidiu



On Tuesday, March 4, 2014 4:28 PM, Jeroen Frijters <[email protected]> wrote:
Hi,

The IKVM binaries are platform independent (apart from JVM.DLL and ikvm-native-win32-*.dll). So you can use the 7.x binaries on Mono on Linux too.

Regards,
Jeroen


> -----Original Message-----
> From: Ovidiu MacSiniuc [mailto:[email protected]]
> Sent: Tuesday, March 4, 2014 15:19
> To: [email protected]
> Subject: [Ikvm-developers] compile java7 classes on linux
> 
> Hello,
> 
> I searched a lot the internet but I could not find a positive answer to
> following question:
> 
> Is there support for ikmvc to compile Java 7 sources on linux?
> 
> I know that under Windows there is no such issue because the latest ikvm
> are build on openjdk-7u6-b24-stripped.zip.
> Unfortunately, I only could find ikvm distributions 7.x for Windows; the
> latest version that is available to Linux distributions is 0.46.0.1, and
> that version is built on openjdk6-b22-stripped.zip. Attempting to
> compile java7 classes will result in Warning IKVMC0108 (class format
> error "51.0") being issued and the class file being including it as
> resource.
> 
> Many thanks,
>    Ovidiu
> 
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