Javax.naming.NoInitialContextException: Need to specify class name...

Question

Hello,
I am trying to use a Database Connection Pool.
Here is the test class am using to verify the connection pool:
public static void main(String[] args) { Connection connection = null; try { InitialContext initialContext = new InitialContext(); DataSource dataSource = (DataSource)initialContext.lookup("jdbc/<alias>"); connection= dataSource.getConnection(); } catch (SQLException e) { //   TODO Auto-generated catch block e.printStackTrace(); } catch (NamingException e) { //   TODO Auto-generated catch block e.printStackTrace(); } Statement stmt = null; try { String query = ""; stmt = connection.createStatement(); ResultSet resultSet = null; query = "SELECT <column> ...'"; resultSet = stmt.executeQuery(query); while(resultSet.next()){ System.out.println(resultSet.getString(<column>)); } stmt.close();   stmt = null; connection.close(); connection = null; } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); }finally{ if (stmt != null) {   try {   stmt.close();   } catch (SQLException sqlex) {   // ignore -- as we can't do anything about it here   }   stmt = null;   }   if (connection != null) {   try { connection.close();   } catch (SQLException sqlex) {   // ignore -- as we can't do anything about it here   } connection = null;   } } }
I get following exception..
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:640) at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243) at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:280) at javax.naming.InitialContext.lookup(InitialContext.java:347) at com.internal.test.TestRun.main(TestRun.java:53) java.lang.NullPointerException at com.internal.test.TestRun.main(TestRun.java:66) Exception in thread "main"
The exception points to
DataSource dataSource = (DataSource)initialContext.lookup("jdbc/OrderStatus");
Is this the correct way to test...?
Thanks
Srinivas

Answer 1

java_2006 wrote:
You can't access a jdbc pool like that (simply with a main method).
The Database connection pool must be managed by a container (a servlet or application server) like tomcat.
That is not entirely true but it certainly helps and is generally the only way it is used anyway so one might as well do it.