Hi,

I'm new to Jboss Server. We are migrating JBoss 4.2 to Jboss 6. Under this we have a TIFF image processing app. deployed as WAR to server.

The respective jars(with correct versions) have been placed under modules folder library path with correct module xml(Sorry, cannot provide the xml here due to access issues ).

We donot have the jars under WEB-INF/lib. Dependency also given to the respective jars in jboss-deployment-descriptor.xml under <dependecies> tag for that module.

But while running the application, we get classcastException

cannot cast from com.sun.media.imageio.plugins.tiff.TIFFImageWriteParam to com.sun.media.imageio.plugins.tiff.TIFFImageWriteParam

on below Code.

import javax.imageio.IIOImage;

import javax.imageio.ImageWriteParam;

import com.sun.media.imageio.plugins.tiff.TIFFImageWriteParam;

....

ImageOutputStream ios = null;

  ImageWriter writer = null;

  try {

  // find an appropriate writer

  Iterator it = ImageIO.getImageWritersByFormatName("TIF");

  if (it.hasNext()) {

  writer = (ImageWriter)it.next();

  } else {

  return false;

  }

  // setup writer

  ios = ImageIO.createImageOutputStream(tiffFile);

  writer.setOutput(ios);

TIFFImageWriteParam imageWriteParam = (TIFFImageWriteParam) writer.getDefaultWriteParam();.

When trying to print the classloader for object and the ref. variable to which we are casting, I get the below.

Object returned by writer.getDefaultWriteParam() is loaded by - sun.misc.launcher$ExtClassLoader

whereas

TIFFImageWriteParam .classs,getClassLoader return ModuleClassLoader with path from the directory where we have put our JAI jars. 

Unable to understand why TIFFImageWriteParam ref. is as Module loader and why the object is as ExtClassLoader.  If once the module loader has loaded then why ExtClassLoader is loading the same again.

On top of this, we dont have any conflicting jars in the ext folder or the path refered for ext.

Please help