oracle10g - passing an object having array to oracle stored procedure -

i've class "user" follows:

public class user{     private string firstname;     private string lastname;     private string[] departments;   } 

i want pass object of user type oracle stored procedure takes object type parameter. did achieve solution:-

1. created user_search_obj type in database follows:-       create or replace         type user_search_obj object (               first_name varchar2(256),               last_name varchar2(256),                departments table_of_values,         );  2. created table_of_values type in database follows:-       create or replace type table_of_values table of varchar2(20);  3. passed user object java class follows:-        object[] departments = {"1","2"};        structdescriptor objdescriptor = structdescriptor.createdescriptor("user_search_obj", conn.getmetadata().getconnection());        arraydescriptor arraydescriptor = arraydescriptor.createdescriptor("table_of_values", conn.getmetadata().getconnection());        array departmentarr = new array(arraydescriptor, conn.getmetadata().getconnection(), departments );        object[] userproperties = new object[2];        userproperties [0] = "paras";//first_name        userproperties [1] = "anand";//last_name        userproperties [2] = departmentarr ;//department array        struct searchobj = new struct(objdescriptor, conn.getmetadata().getconnection(), userproperties );        callablestatement cstmt = conn.preparecall("pck_search2.user_search(?,?)");        cstmt.setobject(1, searchobj);        cstmt.registeroutparameter(2, oracletypes.cursor);        cstmt.execute(); 

but when run code exception follows:-

java.sql.sqlexception: inconsistent java , sql object types     @ oracle.sql.structdescriptor.tooraclearray(structdescriptor.java:709)     @ oracle.sql.structdescriptor.toarray(structdescriptor.java:1296)     @ oracle.sql.struct.<init>(struct.java:165)     @ com.ensenda.lmp.web.controller.user.main(user.java:75) 

this exception comes @ following line of code:-

struct searchobj = new struct(objdescriptor, conn.getmetadata().getconnection(), userproperties ); 

please let me know i'm going wrong.

firstly think should arrayoutofboundexception because have declared object[2] , trying put 3rd element it. considering typo.

for original problem instead of using setobject can use *jdbcutil.setstruct(conn,cstmt,1,"user_search_obj",userproperties);*