How does JAVA catch Trigger's Exception?

Question

I have a JAVA program which call a SQL (insert a record into table A). On the other hand, I have a trigger written in Oracle DB, which inserts a record to table B after a record has been added to table A.
Now, I find that when the trigger fails, both table A and table B doesn't have the new record. It seems to rollback the insertion into table A.
I want to catch the exception in the JAVA, but no exception is returned to the JAVA code. However, when i simulate the insert statement in the Oracle DB, there is some exception returned.
Do anyone know how to get the exception in JAVA?
--- java code reference ---
try
xxx.executeUpdate("insert into xxx (....) values ('"...."');
}catch(Exception e)
e.printStackTrace();

Answer 1

Further information of the scripts
------------------- Script in Oracle ----------
create table a
(a1 varchar2(10));
create table b
(b1 varchar2(10));
create table c
(c1 varchar2(10));
create table d
(d1 varchar2(10));
insert into b values ('1');
insert into b values ('2');
insert into b values ('3');
insert into b values ('4');
insert into c values ('1');
insert into c values ('2');
insert into c values ('3');
CREATE OR REPLACE TRIGGER abc
AFTER INSERT ON a
FOR EACH ROW
DECLARE
     temp_b1 varchar2(10);
BEGIN
     SELECT b.b1 INTO temp_b1
     FROM b, c
     WHERE b.b1 = c.c1
     and b.b1 = :New.a1;
     INSERT INTO d(d1) VALUES(temp_b1);
END;
---------------- Run in SQLPLUS --------
SQL> insert into a values ('4');
insert into a values ('4')
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at "BCA.ABC", line 6
ORA-04088: error during execution of trigger 'BCA.ABC'
---------------- Script in JAVA ----------
import java.io.*;
import java.sql.*;
import java.util.*;
import oracle.jdbc.OracleDriver;
import oracle.jdbc.driver.OracleSQLException;
public class langtest
     public static void main(String args[])
          throws Exception
          DriverManager.registerDriver(new OracleDriver());
          Connection connection = DriverManager.getConnection("jdbc:oracle:thin:[user_name]/[password]@[ip_address]:[port]:[service]");
          PreparedStatement pst = connection.prepareStatement("insert into a values ('4')");
          try {
               pst.execute();
          } catch (OracleSQLException e)
               System.out.println(e.getMessage());
               System.out.println("done");
---------------- Run in JAVA Program -----
There is no error message in JAVA. No exception prompt out. Do you know how I can get the exception in JAVA, just like the Oracle SQLPLUS encountered?
Kelvin