remove timestamp from log appender helper

feign-core/src/main/java/feign/Logger.java

@@ -18,7 +18,6 @@ package feign;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.Reader;
-import java.text.SimpleDateFormat;
 import java.util.logging.FileHandler;
 import java.util.logging.LogRecord;
 import java.util.logging.SimpleFormatter;
@@ -90,18 +89,16 @@ public abstract class Logger {
     }
 
     /**
-     * helper that configures jul to sanely log messages.
+     * helper that configures jul to sanely log messages at FINE level without additional formatting.
      */
     public JavaLogger appendToFile(String logfile) {
-      final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
       logger.setLevel(java.util.logging.Level.FINE);
       try {
         FileHandler handler = new FileHandler(logfile, true);
         handler.setFormatter(new SimpleFormatter() {
           @Override
           public String format(LogRecord record) {
-            String timestamp = sdf.format(new java.util.Date(record.getMillis())); // NOPMD
-            return String.format("%s %s%n", timestamp, record.getMessage()); // NOPMD
+            return String.format("%s%n", record.getMessage()); // NOPMD
           }
         });
         logger.addHandler(handler);