How to Call C and Java from PLSQL

Call C

csum

int csum(int a, int b)
{
return (a+b);
}

gcc -c -fPIC csum.c -o csum.o
gcc -shared -Wl,-soname,csum.so.1 -o csum.so.1.0.1 csum.o

mv csum.so.1.0.1 /oracle/product/11.2.0/dbhome_1/lib
ln -sf /oracle/product/11.2.0/dbhome_1/lib/csum.so.1.0.1 /oracle/product/11.2.0/dbhome_1/lib/csum.so
ln -sf /oracle/product/11.2.0/dbhome_1/lib/csum.so.1.0.1 /oracle/product/11.2.0/dbhome_1/lib/csum.so.1

create or replace library calc_sum as '/oracle/product/11.2.0/dbhome_1/lib/csum.so';
/

create or replace function getCSUM( a binary_integer,b binary_integer) return binary_integer
as language c
library calc_sum
name "csum";
/

select getCSUM(10,2) from dual;

Call Java

java

public class JSUM

{

public static int sum ( int a , int b){return a+b;}

}

[oracle@db11g myC]$ /oracle/product/11.2.0/dbhome_1/jdk/bin/javac JSUM.java

[oracle@db11g myC]$ loadjava -user hr/hr JSUM.class

 ALTER JAVA CLASS "JSUM"
    RESOLVER (("C:\app\Administrator\product\11.2.0\dbhome_1\jdk\bin\*" pm)(* public))
   RESOLVE;

create or replace function javaSUM( a number,b number) return number

as

language java

name 'JSUM.sum(int,int) return int';

/

select javaSUM(1,2) from dual;