Java Utililty Methods Throwable to String

try {
    StringWriter stringWriter = new StringWriter();
    PrintWriter printWriter = new PrintWriter(stringWriter);
    try {
        e.printStackTrace(printWriter);
        return stringWriter.getBuffer().toString();
    } finally {
        stringWriter.close();
...

return getExceptionDetails(e, "");

StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
pw.println("Exception: ");
throwable.printStackTrace(pw);
return sw.toString();

Pattern pattern = Pattern.compile("([\\w\\.]+)(:.*)?");
String stackTrace = getStackTrace(t);
Matcher matcher = pattern.matcher(stackTrace);
if (matcher.find())
    return matcher.group(1);
return null;

final StringBuilder result = new StringBuilder();
result.append(aThrowable.toString());
final String NEW_LINE = System.getProperty("line.separator");
result.append(NEW_LINE);
for (StackTraceElement element : aThrowable.getStackTrace()) {
    result.append(element);
    result.append(NEW_LINE);
return result.toString();

java.io.StringWriter wSW = new java.io.StringWriter();
e.printStackTrace(new java.io.PrintWriter(wSW));
return wSW.toString();

String msg = e.getMessage();
try {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    e.printStackTrace(pw);
    msg = sw.toString();
} catch (Throwable e2) {
    msg = "bad getErrorInfoFromException";
...

StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
ex.printStackTrace(pw);
pw.close();
return sw.toString();

if (null == exception)
    throw new IllegalArgumentException("exception can't be null;");
String stack_trace;
StringWriter string_writer = new StringWriter();
try (PrintWriter print_writer = new PrintWriter(string_writer)) {
    exception.printStackTrace(print_writer);
    stack_trace = string_writer.getBuffer().toString();
return stack_trace;

if (null == exception)
    throw new IllegalArgumentException("exception can't be null;");
String stack_trace = null;
StringWriter string_writer = new StringWriter();
PrintWriter print_writer = new PrintWriter(string_writer);
exception.printStackTrace(print_writer);
stack_trace = string_writer.getBuffer().toString();
print_writer.close();
...