Java Utililty Methods Exception to String

StackTraceElement[] es = exception.getStackTrace();
StringBuilder builder = new StringBuilder();
builder.append(exception.toString());
for (StackTraceElement e : es) {
    builder.append("\n\tat ");
    builder.append(e.toString());
return builder.toString();
...

StringBuffer st = new StringBuffer();
Throwable e2 = e;
while (e2 != null) {
    String exClass = e2.getClass().getName();
    String msg = e2.getMessage();
    if (msg != null) {
        st.setLength(0);
        st.append(exClass);
...

e.printStackTrace();
return "Exception thrown: " + e.getClass().getName() + " : " + e.getMessage();

if (e == null) {
    return "";
e.printStackTrace(); 
String emessage = e.getMessage();
if (emessage == null) {
    emessage = "No Message";
return "Exception: " + e.getClass().getName() + "\n" + ((message != null) ? message + "\n" : "")
        + emessage.replaceAll("<", "&lt;");

Exception e = (Exception) exception;
Integer line = null;
String className = null;
String methodName = null;
if (e.getStackTrace() != null && e.getStackTrace().length > 2) {
    line = e.getStackTrace()[2].getLineNumber();
    className = e.getStackTrace()[2].getClassName();
    methodName = e.getStackTrace()[2].getMethodName();
...

if (x == null)
    return ("NULL exception!");
return (throwableToString(x, ""));

return "<span style='color:red; font-size:10px;'>" + e.toString() + "</span>";

return exceptionToString(ex, "; ");

StringBuilder result = new StringBuilder();
Throwable cause = throwable;
while (cause != null) {
    if (result.length() == 0) {
        result.append("\nException in thread.");
    } else {
        result.append("\nCaused by: ");
    result.append(cause.getClass().getCanonicalName()).append(": ").append(cause.getMessage());
    for (final StackTraceElement traceElement : cause.getStackTrace()) {
        result.append("\n\tat ").append(traceElement.toString());
    cause = cause.getCause();
return result.toString();

return exceptionToString(e, false);