How can I use the procedures and functions in my library

hello, all
I have a pl/sql library MYLIB.pld, MYLIB.pll and MYLIB.plx.
How can I invoke procedures and functions there in JDeveloper?

I am indeed using ADF BC to re-develop the oracle application.
Here is my situation:
We have an oracle form application.
Our objective is to try to re-use the existing sources in the form application as much as possible:
1. tons of procedures and functions in a pl/sql library(a file with extension name portfolioLib.pll or portfolioLib.plx);
2. tons of form-level triggers, data-block triggers and item-triggers;
3. tons of database stored procedures and triggers;
After doing a research on JDeveloper, we decide to use ADF Swing+ADF BC to re-develop the application.
My opinion for the above three kinds of sources in our form application is:
for 1: we try to move most of procedures and functions into database(except Form build-in);
for 2: we try to wrap those triggers in a SQLJ class;
for 3: we try to call database procedures and functions with PreparedStatment or CallableStatement;
I just do a test on a post-query trigger on a data-block:
I created a sqlj file, named testSQLJ.sqlj in the test.view package;
I tried to call it in createInstanceFromResultSet of which is test.model package,
I was told that testSQLJ cannot be found there. why?
How can I call some classes from test.view package in some classes of test.model?
I read some documents about how to deal with post-query trigger in JDeveloper: create a view with SQL statement, but it seems that it does not support pl/sql statement there.
Can you give me some opinion about the above stuff?
I really appreciate your help.

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