--- a/src/goodjava/logger/RollingFileAppender.java	Fri Apr 17 11:16:38 2020 -0600
+++ b/src/goodjava/logger/RollingFileAppender.java	Fri Apr 17 13:56:57 2020 -0600
@@ -3,6 +3,7 @@
 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
+import goodjava.io.IoUtils;
 
 
 public class RollingFileAppender extends WriterAppender {
@@ -32,25 +33,17 @@
 	protected void rollOver() {
 		close();
 		File backup = new File(fileName+'.'+backups);
-		if( backup.exists() ) {
-			if( !backup.delete() )
-				debug("couldn't delete "+backup);
-		}
-		for( int i=backups-1; i>=1; i-- ) {
-			File f = backup;
-			backup = new File(fileName+'.'+i);
-			backup.renameTo(f);
-		}
-		if( !file.renameTo(backup) )
-			debug("couldn't rename "+file+" to "+backup);
 		try {
+			IoUtils.delete(backup);
+			for( int i=backups-1; i>=1; i-- ) {
+				File f = backup;
+				backup = new File(fileName+'.'+i);
+				IoUtils.move(backup,f);
+			}
+			IoUtils.move(file,backup);
 			open();
 		} catch(IOException e) {
 			throw new RuntimeException(e);
 		}
 	}
-
-	protected void debug(String msg) {
-		System.err.println("RollingFileAppender: "+msg);
-	}
 }