Java Utililty Methods SQLWarning to String

StringBuffer buffer = new StringBuffer();
String newLine = System.getProperty("line.separator");
do {
 buffer.append("error code = ").append(sqlw.getErrorCode()).append(newLine);
 buffer.append("localized message = ").append(sqlw.getLocalizedMessage()).append(newLine);
 buffer.append("message = ").append(sqlw.getMessage()).append(newLine);
 buffer.append("sqlstate = ").append(sqlw.getSQLState()).append(newLine);
 sqlw = sqlw.getNextWarning();
...

if (warnings == null) {
 return null;
StringBuilder sb = new StringBuilder();
for (Throwable t : warnings) {
 sb.append("SQL Exception [" + t + "] ");
return sb.toString();
...