Here is my code:
import javax.naming.InitialContext;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.QueueSender;
import javax.jms.DeliveryMode;
import javax.jms.QueueSession;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
public class Sender
{
public static void main(String[] args) throws Exception
{
// get the initial context
InitialContext ctx = new InitialContext();
// lookup the queue object
Queue queue = (Queue) ctx.lookup("queue/queue0");
// lookup the queue connection factory
QueueConnectionFactory connFactory = (QueueConnectionFactory) ctx.
lookup("queue/connectionFactory");
// create a queue connection
QueueConnection queueConn = connFactory.createQueueConnection();
// create a queue session
QueueSession queueSession = queueConn.createQueueSession(false,Session.DUPS_OK_ACKNOWLEDGE);
// create a queue sender
QueueSender queueSender = queueSession.createSender(queue);
queueSender.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
// create a simple message to say "Hello"
TextMessage message = queueSession.createTextMessage("Hello");
// send the message
queueSender.send(message);
// print what we did
System.out.println("sent: " + message.getText());
// close the queue connection
queueConn.close();
}
}
Eclipse is not reporting any errors in the above code -- I'm able to compile successfully. However, when I try running it, I get the following exception:
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 Sender.main(Sender.java:21)
Can anyone please help me fix the bug? I tried fixing it for a few hours but still cannot figure it out.
This question is related to
java
jakarta-ee
exception
If working on EJB client library:
You need to mention the argument for getting the initial context.
InitialContext ctx = new InitialContext();
If you do not, it will look in the project folder for properties file. Also you can include the properties credentials or values in your class file itself as follows:
Properties props = new Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
props.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");
props.put(Context.PROVIDER_URL, "jnp://localhost:1099");
InitialContext ctx = new InitialContext(props);
URL_PKG_PREFIXES: Constant that holds the name of the environment property for specifying the list of package prefixes to use when loading in URL context factories.
The EJB client library is the primary library to invoke remote EJB components.
This library can be used through the InitialContext. To invoke EJB components the library creates an EJB client context via a URL context factory. The only necessary configuration is to parse the value org.jboss.ejb.client.naming for the java.naming.factory.url.pkgs property to instantiate an InitialContext.
We need to specify the INITIAL_CONTEXT_FACTORY, PROVIDER_URL, USERNAME, PASSWORD etc. of JNDI to create an InitialContext
.
In a standalone application, you can specify that as below
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, "ldap://ldap.wiz.com:389");
env.put(Context.SECURITY_PRINCIPAL, "joeuser");
env.put(Context.SECURITY_CREDENTIALS, "joepassword");
Context ctx = new InitialContext(env);
But if you are running your code in a Java EE container, these values will be fetched by the container and used to create an InitialContext
as below
System.getProperty(Context.PROVIDER_URL);
and
these values will be set while starting the container as JVM arguments. So if you are running the code in a container, the following will work
InitialContext ctx = new InitialContext();
Source: Stackoverflow.com