Struts2 jquery creates infinite levels of trees_jquery

//Required :Struts2, jquery tree plug-in, its download address is: http://xiazai.jb51.net/200910/other/jquery.treeview.zip
//Infinite-level tree--Author Ren Wenmin of Chenzhou Tuozhi Software College
//Simulated database data: Each row of data includes--own ID, own content, father ID
ArrayList ary = new ArrayList(); //All data
String[] ary1 = new String[] {"1","item1","0"}; //Each row of data
ary.add(ary1);
ary1 = new String[]{"2","item2","0" };
ary.add(ary1);
ary1 = new String[]{"3","item3","0"};
ary.add(ary1);
ary1 = new String[]{"4","item1_1","1"};
ary.add(ary1);
ary1 = new String[]{"5","item1_2","1"} ;
ary.add(ary1);
ary1 = new String[]{"6","item1_2_1","5"};
ary.add(ary1);
ary1 = new String[]{"7","item1_2_2","5"};
ary.add(ary1);
ary1 = new String[]{"8","item2_1","2"};
ary.add(ary1);
ary1 = new String[]{"9","item2_1_1","8"};
ary.add(ary1);
ary1 = new String []{"10","item2_2","2"};
ary.add(ary1);
ary1 = new String[]{"11","item3_1","3"};
ary.add(ary1);
ary1 = new String[]{"12","item3_2","3"};
ary.add(ary1);
request.setAttribute(" datas",ary);
%>

jquery tree plug-in, its download address is: http://xiazai.jb51.net/200910/other/jquery.treeview.zip