CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED TEST.SwapClassSRC as 
import java.io.*;

public class Swapper{

    public static void swapValues(int a, int b) {
      int tmp = a;
      a = b;
      b = tmp;   
    }
};

CREATE OR REPLACE PROCEDURE TEST.swap (x IN OUT NUMBER, y IN OUT NUMBER)
AS LANGUAGE JAVA
NAME 'Swapper.swapValues(int[], int[])';

DECLARE
  a number := 33;
  b number := 55;
BEGIN
  dbms_output.put_line('a='||a);
  dbms_output.put_line('b='||b);
  TEST.swap(a,b);
  dbms_output.put_line('a='||a);
  dbms_output.put_line('b='||b);
END;

ORA-29531: отсутствует метод swapValues в классе Swapper
ORA-06512: на  "TEST.SWAP", line 1
ORA-06512: на  line 7

create or replace and compile java source named Swapper as
public class Swapper
{
    public static void swapValues(int[] a, int[] b) {
      int tmp = a[0];
      a[0] = b[0];
      b[0] = tmp;   
    }
}