There are three possible causes for an OutOfMemoryError. The first is that the JVM has a real memory leak, caused by a bug in the internal implementation of the JVM heap management. This is extremely unlikely. All JVMs are tested very strenuously for this, and

If using SimpleDateFormat to parse a string into a Date object, it may fail if the Locale sets in SimpleDateFormat differ from the string format. java.text.ParseException: Unparseable date: "02NOV2004" at java.text.DateFormat.parse(DateFormat.java:335) The above example shows an exception