Fixed javadoc with new exception

src/main/java/beamline/sources/Source.java

@@ -28,9 +28,9 @@ public interface Source<T> {
 	 * This method is supposed to be called before the {@link #getObservable()}
 	 * one: it is in charge of preparing the source to be processed.
 	 * 
-	 * @throws Exception while preparing the source, it is important to be aware
-	 * that some sources may generate specific exceptions (e.g., file not found,
-	 * network problems).
+	 * @throws SourceException while preparing the source, it is important to be
+	 * aware that some sources may generate specific exceptions (e.g., file not
+	 * found, network problems).
 	 */
 	public void prepare() throws SourceException;
 }