scott@ORA92> create or replace
  2  and compile java source named "ArrayDemo"
  3  as
  4  import java.io.*;
  5  import java.sql.*;
  6  import oracle.sql.*;
  7  import oracle.jdbc.driver.*;
  8  
  9  public class ArrayDemo
 10  {
 11  public static void passArray() throws SQLException
 12  {
 13  	 Connection conn =
 14  	    new OracleDriver().defaultConnection();
 15  
 16  	 String strArray[] = { "Account","Marketing","Computer" };
 17  
 18  	 ArrayDescriptor descriptor =
 19  	    ArrayDescriptor.createDescriptor( "STRING_ARRAY", conn );
 20  
 21  	 ARRAY array_to_pass =
 22  	    new ARRAY( descriptor, conn, strArray );
 23  
 24  	 OraclePreparedStatement ps =
 25  	     (OraclePreparedStatement)conn.prepareStatement
 26  	     ( "begin give_me_an_array(:x); end;" );
 27  
 28  	 ps.setARRAY( 1, array_to_pass );
 29  
 30  	 ps.execute();
 31  
 32  }
 33  
 34  }
 35  /

Java created.

scott@ORA92> show errors
No errors.
scott@ORA92> create or replace type STRING_ARRAY as table of varchar2(30);
  2  /

Type created.

scott@ORA92> show errors
No errors.
scott@ORA92> create or replace
  2  procedure give_me_an_array( p_array in string_array )
  3  as
  4  begin
  5  	 for i in 1 .. p_array.count
  6  	 loop
  7  	     dbms_output.put_line( p_array(i) );
  8  	 end loop;
  9  end;
 10  /

Procedure created.

scott@ORA92> show errors
No errors.
scott@ORA92> create or replace
  2  procedure show_java_calling_plsql
  3  as language java
  4  name 'ArrayDemo.passArray()';
  5  /

Procedure created.

scott@ORA92> show errors
No errors.
scott@ORA92> set serveroutput on
scott@ORA92> exec show_java_calling_plsql
Account
Marketing
Computer

PL/SQL procedure successfully completed.

create or replace type SAMPLE_TYPE is object (person_id number,
                                              birthday date);

create or replace type SAMPLE_TYPE_TAB is table of SAMPLE_TYPE

create or replace and compile java source named Person as
import java.util.Date;
  public class Person
     { public int person_id;
       public Date birthday;
     }

create or replace and compile java source named arraydemo as
import java.io.*;
  import java.sql.*;
  import oracle.sql.*;
  import oracle.jdbc.driver.*;
  import java.text.DateFormat;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Date;

  public class ArrayDemo
  {
   	private final String JAVA_DATE_FORMAT = "dd-MMM-yyyy hh:mm:ss a";
  
    public Date getDate(String strDate) {
	    	Date dt = null;
    		DateFormat dateFormat = new SimpleDateFormat(JAVA_DATE_FORMAT);
    		try {
      			dt = dateFormat.parse(strDate);
            } catch (ParseException e) {
    		}
		    return dt;
      }

     public static void passArray() throws SQLException
     {
        Connection conn = new OracleDriver().defaultConnection();

        ArrayDemo a = new ArrayDemo(); 

        Person pn1 = new Person();
        pn1.person_id = 1;
        pn1.birthday  = a.getDate("01-JAN-2000");
        
        Person pn2 = new Person();
        pn2.person_id = 2;
        pn2.birthday  = a.getDate("01-JAN-2001");

        Person pn3 = new Person();
        pn3.person_id = 31;
        pn3.birthday  = a.getDate("01-JAN-2002");
        
      	Person[] P_arr = {pn1, pn2, pn3};

 	 ArrayDescriptor descriptor =
  	    ArrayDescriptor.createDescriptor( "SAMPLE_TYPE_TAB", conn );

  	 ARRAY array_to_pass =
  	    new ARRAY( descriptor, conn, P_arr);

  	 OraclePreparedStatement ps =
  	     (OraclePreparedStatement)conn.prepareStatement
  	     ( "begin give_me_an_array(:x); end;" );

  	 ps.setARRAY( 1, array_to_pass );
  	 ps.execute();
  }
}

ORA-29532: Java call terminated by uncaught Java exception: java.sql.SQLException:Fail to convert to internal representation: Person@e2c7e499
ORA-06512: at "SCOTT.SHOW_JAVA_CALLING_PLSQL",LINE 0
ORA-06512: at line 3

Oracle9i JDBC Developer's Guide and Reference
Release 2 (9.2)
11 Working with Oracle Collections:
Note
The setARRAY(), setArray(), and setObject() methods of the OraclePreparedStatement class take an object of the type oracle.sql.ARRAY as an argument, not an array of objects.