How to call java class from pl/sql procedure ?

Hello everyone,
My query is..
There is one pl/sql stored procedure which is doing some business logic and storing data in some columns of one table, suppose the table name is 'ABC' .. and the rest of columns of table ABC are getting updated using java class. Now my problem is whenever I insert data in ABC using store proc.. i have to call that java class so that it will update the rest columns ( why java class for updating the columns in ABC is ..because that logic cant be done from pl/sql proc.. it has to be done using java )
and the other thing is.. oracle is in one machine and java is in another .. :(
hope ..u can help me out !!
Thank in advance !!

but that updation have to be done from java code only.. we are using GIS tools .. have to create some shape files and update the column with that shape file.. so creation of shape file has to be done from java code only..
so how to call java class file which is on another machine and oracle in another..

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