Programmatically importing an existing project into Eclipse
Use org.eclipse.ui.wizards.datatransfer.ImportOperation
Try something like this:
IOverwriteQuery overwriteQuery = new IOverwriteQuery() {
public String queryOverwrite(String file) { return ALL; }
};
String baseDir = // location of files to import
ImportOperation importOperation = new ImportOperation(project.getFullPath(),
new File(baseDir), FileSystemStructureProvider.INSTANCE, overwriteQuery);
importOperation.setCreateContainerStructure(false);
importOperation.run(new NullProgressMonitor());
You're probably missing a line with
description.setLocation(new Path("/absolute/path/to/project/folder"));