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Compiled classes using V2.0 and deployed to iSeries IFS running V4.R5.M0 and get UnSupportedClass error even for simple helloworld app. Also run WSAD 4.0 imported project into there, compiled and deployed with exactly same IDE setup (JDK etc...) and it works fine. I assume that the compiler in Eclipse is not creating the same class object way as WSAD's compiler does. Both IDE compiled objects run fine on iSeries V5.R1.M0 though, unfortunately my platform is not to be upgraded yet and WSAD is trial copy.
WSAD is built on top of Eclipse, so you are likely using the same compiler, simply a different version of it. The Eclipse R2.0 compiler can be toggled for 1.3 or 1.4 compliance (1.3 is the default). When compiling in 1.4 mode, the classfile are targeted for a 1.4 VM or better, and if attempting to run the classfile on a 1.3 target, then the VM will refuse to load them, arguing a format error (when actually only the classfile tag is the issue). This is a VM restriction which we have to be compliant with. For instance, it enforces the 1.4 support for assertions is around at runtime (need extra classes in system libraries). Under the compiler compliance setting, you can tell it to use 1.4 compliance mode, but 1.3 source mode and 1.1 target mode (in the same way as you can use a jdk1.4 javac in "-source 1.3" mode). Assertions are no longer supported, but the classfile can then run on a older target. If you are seeing a different problem, please elaborate on your symptoms, you could have found a bug. But having even 'hello world' fail likely indicate a major issue as the one I described above.
Is it ok to close, or could you provide more information ?
Closing, please reopen if you have more information to provide.
