Pass oracle object type to java stored procedure

Is is possible to pass oracle object type to java stored procedure. Here's what i have so far.

Java stored procedure:

create or replace and compile java source named Example as
import java.sql.SQLData;
import java.sql.SQLException;
import java.sql.SQLInput;
import java.sql.SQLOutput;

public class Example {
    
    public static void test(ExObj obj) {
        System.out.println(obj.client);
    }
    
    public static class ExObj implements SQLData {

        public String client = "";

        public String sql_type = "EXAMPLE_OBJECT";

        public ExObj(String client, String sql_type) {
            this.client = client;

            this.sql_type = sql_type;
        }

        /* IMPLEMENTS SQLData */

        public void setSqlType(String sqlType) {
            sql_type = sqlType;
        }

        public void writeSQL(SQLOutput stream) throws SQLException {
            stream.writeString(this.client);
        }

        public String getSQLTypeName() {
            return sql_type;
        }

        public void readSQL(SQLInput stream, String sqlTypeName) throws SQLException {
            sql_type = sqlTypeName;

            this.client = stream.readString();
        }

    }
}

Oracle procedure:

CREATE OR REPLACE PROCEDURE example(ex_obj in example_object)
AS LANGUAGE JAVA
NAME 'Example.test(java.sql.Struct)';

Oracle object type:

create or replace type example_object as object(
  client varchar2(40)
)

Script to call procedure:

declare
  l_output DBMS_OUTPUT.chararr;
  l_lines  INTEGER := 1000;
  
  l_obj example_object;
begin
  DBMS_OUTPUT.enable(1000000);
  DBMS_JAVA.set_output(1000000);
  
  l_obj := example_object('client');
  example(l_obj);

  DBMS_OUTPUT.get_lines(l_output, l_lines);

  FOR i IN 1 .. l_lines LOOP
    -- Do something with the line.
    -- Data in the collection - l_output(i)
    DBMS_OUTPUT.put_line(l_output(i));
  END LOOP;
end;

When running script i get:

ORA-29531: no method test in class Example

ORA-06512: at "EXAMPLE", line 1

ORA-06512: at line 17

I presume it's because oracle object_type doesn't map to java class correctly. Is there a way to do this and if so what am i doing wrong?

Copyright Notice：Content Author:「Simas.B」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/41812935/pass-oracle-object-type-to-java-stored-procedure