public class MailProcessingContext {

    private ThreadLocal<HashMap<String, Object>> context
            = new ThreadLocal<HashMap<String, Object>>();

    public <T> void put(String key, T value){
        context.get().put(key, value);
    }

    public <T> T get(String key){
       return (T) context.get().get(key);
    }

    public void clear(){
        context.get().clear();
    }
}