NoInitialContextException错误Tomcat

Question

I've been trying to find a solution here but I cant... I have the following code and i get this error.

Am I missing something? Thank you :)

Code

package src;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Wrapper;
import java.util.Hashtable;
import java.util.Properties;
import java.io.*;
import javax.*;
import javax.activation.DataSource;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import oracle.jdbc.pool.OracleDataSource;

public class TestServlet {

    @SuppressWarnings("unused")
    public static void main(String[] argv) throws SQLException, NamingException {

        Context initialContext = new InitialContext();
        if ( initialContext == null){System.out.println("initialContext null");}
        else {System.out.println("initialContext");}

        // Get DataSource
        Context environmentContext = (Context)initialContext.lookup("java:/comp/env");
        if ( environmentContext == null){System.out.println("envContext null.");}
        else {System.out.println("envContext");}

        DataSource ds = (DataSource)environmentContext.lookup("jdbc/testdb");



        System.out.println("\n -------- Oracle JDBC Connection Testing ------");

        try {

            Connection jdbcConnection = ((Statement) ds).getConnection();
            OracleDataSource ods = ((Wrapper) ds).unwrap(OracleDataSource.class);
            jdbcConnection.close();

        } catch (SQLException e) {

            System.out.println("Connection Failed! Check output console");
            e.printStackTrace();
            return;

        }

        String message = "You are connected!";
        System.out.println(message);

    }

}

context.xml

<Context>
    <Resource name="jdbc/testdb"
    auth="Container"
    type="javax.sql.DataSource" 
    maxActive="100"
    maxIdle="30"
    maxWait="10000" 
    username="dba01"
    password="qvE-g7Cacontext.xml"
    driverClassName="com.mysql.jdbc.Driver" 
    url="jdbc:oracle:thin:@10.0.1.6:1521:xe"/>
</Context>

Error

Exception in thread "main" 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(Unknown Source)
    at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
    at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
    at javax.naming.InitialContext.lookup(Unknown Source)
    at src.TestServlet.main(TestServlet.java:34)

Please let me know if you need more information!

Answer 1

You need an initial context factory. For Tomcat it is org.apache.naming.java.javaURLContextFactory :

        System.setProperty(Context.INITIAL_CONTEXT_FACTORY,
                  "org.apache.naming.java.javaURLContextFactory");

Answer 2

So is it the code deployed on the server? It seems you try to access the Context using standard java as you call static main (so I guess you are calling TeestServlet.main from your runtime). The context will be setup by the web server (Tomcat), so it is availble only after you deploy your web application to it.

Answer 3

Please note that driverClassName that you are using is incorrect. It should be "oracle.jdbc.OracleDriver" if you are trying to connect to Oracle Database.

<Context>
    <Resource name="jdbc/testdb"
    auth="Container"
    type="javax.sql.DataSource" 
    maxActive="100"
    maxIdle="30"
    maxWait="10000" 
    username="dba01"
    password="qvE-g7Cacontext.xml"
    driverClassName="com.mysql.jdbc.Driver" 
    url="jdbc:oracle:thin:@10.0.1.6:1521:xe"/>
</Context>