Java Utililty Methods Exception to String

final StringBuilder sb = new StringBuilder();
e.printStackTrace(new PrintStream(new OutputStream() {
    @Override
    public void write(int b) throws IOException {
        sb.append((char) b);
}));
return sb.toString();
...

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

return getExceptionMessage(ex, true);

StringBuilder sb = new StringBuilder();
if (ex != null) {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    ex.printStackTrace(pw);
    sb.append(sw.toString());
return sb.toString();
...

return ex.getClass().getSimpleName();

java.io.OutputStream out = new java.io.ByteArrayOutputStream();
java.io.PrintStream ps = new java.io.PrintStream(out, true);
exception.printStackTrace(ps);
String str = out.toString();
return str;

final StringWriter sw = new StringWriter();
exception.printStackTrace(new PrintWriter(sw));
return sw.toString();