javax naming NoInitialContextException - Java

Question

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

User · Answer

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

User · Answer

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

[java] javax.naming.NoInitialContextException - Java

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