Java APIs

ChatGPT's answer - how accurate it is I don't know as I stay away from my least favourite language Java. Either way it should give you some ideas as to how to resolve your problem.
AI:
In Java, you can use the ArrayDescriptor class from the oracle.sql package to create an array that can be passed as a parameter to an Oracle stored procedure.
Here is an example of how you can create an Array object of type t_a_varchar2s to pass as a parameter to an Oracle stored procedure:

import java.sql.Array;
import java.sql.Connection;
import java.sql.SQLException;
import oracle.sql.ArrayDescriptor;
// ...
ArrayDescriptor descriptor = ArrayDescriptor.createDescriptor("T_A_VARCHAR2S", connection);
String[][] data = { {"value1", "value2", "value3"}, {"value4", "value5", "value6"} };
Array array = new ARRAY(descriptor, connection, data);
// pass the array as a parameter to the stored procedure
callableStatement.setArray(1, array);

In this example, connection is an open java.sql.Connection object to the Oracle database, and callableStatement is a java.sql.CallableStatement object representing the stored procedure that you are calling. Note that you need to have ojdbc.jar added to your classpath.