I have a web application and I use a helper class to provide some
global static methods. This is one of them:

public static int parseIntString(String string, int defaultValue)
{
int value = defaultValue;
if (string == null || string.trim().length() == 0)
return value;
try
{
value = Integer.parseInt(string);
}
catch (NumberFormatException ex)
{
value = defaultValue;
}
return value;
}

Since this function is called from servlets, it is definitely accessed
by several threads at once. My question is - do I need to synchronize
it or is such method thread-safe? It does not change any class or
instance fields.