I write a recursive class Resource

class Resource
{
String id;
String name;
ArrayList propertys; //element is prop
ArrayList children; // element is resource
}

class prop
{
String id;
String name;
String content; //will be long string
}

when i create a resource with 100 children and 10 properties, all child
has same children and property as parent, .... 20000 elements is created,
and then i save the root element, hibernate execute fial and without exception be throw, why?