committing an aborted transaction

If one commits an aborted transaction, it seems to rollback without any
notice. Whether a transaction should be aborted by an exception seems
debatable, but to have a commit quietly rollback instead is terrible design.
Committing an aborted transaction should throw an exception. Below is an
example program:

import java.sql.*;

public class P {
public static void main(String[] args) throws Exception {
Class.forName("org.postgresql.Driver");
Connection con =
DriverManager.getConnection("jdbc:postgresql://localhost/n1","postgres","word");
Statement stmt = con.createStatement();
stmt.executeUpdate("drop table if exists t");
stmt.executeUpdate("create table t (id integer)");
stmt.close();

con.setAutoCommit(false);
stmt = con.createStatement();
stmt.executeUpdate("insert into t (id) values (1)");
ResultSet rs = stmt.executeQuery("select * from t where id=1");
System.out.println( (rs.next() ? "ok" : "not found") + " in transaction");
try {
stmt.executeUpdate("nonsense");
} catch(SQLException e) {}
stmt.close();
con.commit();

con.setAutoCommit(true);
stmt = con.createStatement();
rs = stmt.executeQuery("select * from t where id=1");
System.out.println( (rs.next() ? "ok" : "not found") + " after
transaction");
stmt.executeUpdate("drop table if exists t");
stmt.close();
con.close();
}
}

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