Which JAR contains the ICadDrawingDataset?

Hi,
using Java SDK 10.1 I'm trying to load a DWG file. Code snippet from sample below.
My question: Which jar library do I have to load to resolve the types ICadDrawingDataset, CadLayer, ICadDrawingDatasetProxy?
Thank you!
Peter

/**
* Adds data to control by using the file path.
*/

public void addData()
{
// Get the last index of file separator
try
{
int index = filePath.lastIndexOf(File.separator);
// Get the directory path containing file path
String strWorkspacePath = filePath.substring(0, index);
String fileName = filePath.substring(index + 1);
System.out.println(fileName);
ICadDrawingDataset cadDrawingDataset = getCadDataSet(strWorkspacePath, fileName);
if (cadDrawingDataset == null)
{
return;
}
// Create a cad layer using cad dataset and add it to map control.
CadLayer cadLayer = new CadLayer();
cadLayer.setCadDrawingDatasetByRef(cadDrawingDataset);
cadLayer.setName(fileName);
mapBean.addLayer(cadLayer, 0);
}
catch (IOException ex)
{
System.out.println("Exception in addData : " + ex);
ex.printStackTrace();
}
}

/**
* Function which creates cad data set using cad workspace path and filname.
*/
public ICadDrawingDataset getCadDataSet(String cadWorkspacePath, String cadFileName)
{
try
{
// Create a WorkspaceName object
WorkspaceName workspaceName = new WorkspaceName();
workspaceName.setPathName(cadWorkspacePath);
workspaceName.setWorkspaceFactoryProgID("esriDataSourcesFile.CadWorkspaceFactory");

// Create a CadDrawingName object
CadDrawingName cadDrawingName = new CadDrawingName();
cadDrawingName.setName(cadFileName);
cadDrawingName.setWorkspaceNameByRef(workspaceName);

// Open the CAD drawing
ICadDrawingDataset cadDrawingDataset = new ICadDrawingDatasetProxy(cadDrawingName.open());

return cadDrawingDataset;
}
catch (IOException ex)
{
System.out.println("Exception in getDataSet : " + ex);
ex.printStackTrace();
return null;
}

}