Skip to main content

External EJB reference

External EJB reference

An EJB reference is called external when the bean B comes from another application unit, which may even be deployed on another server.In this case, you cannot rely on the standard <ejb-link> tag in web.xml since there the beans are not covered in the same file. Instead, you must provide the full JNDI name of the bean B in jboss-web.xml. A full name is of the form: 


Note:: if we are calling remote ejb methods from servlets that we can Omit to specify any thing regarding ejb's in web.xml and jboss-web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <servlet>
  <servlet-name>AServlet</servlet-name>
  <servlet-class>AServlet</servlet-class>
  </servlet>

  <ejb-ref>
  <ejb-ref-name>ejb/BHome</ejb-ref-name>
  <ejb-ref-type>Session</ejb-ref-type>
  <home>BHome</home>
  <remote>B</remote>
  </ejb-ref>
  <ejb-ref>
  <ejb-ref-name>ejb/RemoteBHome</ejb-ref-name>
  <ejb-ref-type>Session</ejb-ref-type>
  <home>BHome</home>
  <remote>B</remote>
  </ejb-ref>
</web-app>












<?xml version="1.0" encoding="UTF-8"?>
<jboss-web>
  <!-- A reference to an EJB in the same server with a custom JNDI binding -->
  <ejb-ref>
  <ejb-ref-name>ejb/BHome</ejb-ref-name>
  <jndi-name>someapp/ejbs/beanB</jndi-name>
  </ejb-ref>
  <!-- A reference to an EJB in an external server -->
  <ejb-ref>
  <ejb-ref-name>ejb/RemoteBHome</ejb-ref-name>
  <jndi-name>jnp://otherserver/application/beanB</jndi-name>
  </ejb-ref>
</jboss-web>

NOTE: this will tell jboss where to look for bean B. You also have to tell jboss what bean B is: in case of an external ejb-reference to another application be sure to include bean B's home and remote interface in servlet war.


Comments

Popular posts from this blog

Masking Credit Card number in Java

Sometimes we need to mask crucial information like Credit Card Numbers, CVV numbers etc before storing  or logging the information. This example mask Credit Card Number (Except last 4 Digit) from a Text which contains information along with Credit Card Number.

The following example demonstrates how we can easily mask the credit card with Matcher and Pattern Classes. This Sample Code uses Matcher and Pattern.
Pattern Used in this sample is not optimized for Credit Card Numbers, this pattern will get any numerical numbers in the String Content.  Based on the Credit Card Type a more efficient and Strict RegEx can be used to mask the Credit Card.
/**Mask the Credit card number but last four digit value **/   Pattern PATTERN = Pattern.compile("[0-9]+"); String message = content; Matcher matcher = PATTERN.matcher(message); String maskingChar = "*"; StringBuilder finalMask = new StringBuilder(maskingChar); while …

Converting Java Map to String

Java Collections framework, String manipulation etc is something that we often encounter in Development process.
For processing collections (like checking null/empty, Intersection, Disjunction) We do have some of the very use full libraries.

Some of the Collection related libraries are Apche Commons Collections and Google  Collections(Guava).

Problem Use Case

This article explains how to convert a Java Map to String(and vice versa) using different libraries and technique.

One way is to use StringBuilder(Or String) and loop though the Map and build the String by applying some sort of separator ( for key:value and entry). Here we have to take care of the null value etc.

Without Any Library
If we want to convert the map to a String with key value separator and also individual entry seperator in the resulting String, we have to write code for that. For a simple Map, we have to iterate though the map, take care of the null values etc. Following is a sample to get String built out from Map C…

Invoking EJB deployed on a remote machine

Invoking EJB deployed on a remote machineIn case we are calling remote ejb( ejb deployed on remote machines),The JNDI lookup might lookup like,Properties env = new Properties();env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");env.put(Context.PROVIDER_URL, "XX.XXX.XX.XX:1099");env.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces"); Context ctx = new InitialContext(env);If we are calling local ejb then we can simply create InitialContext without any parameters.Like,Context ctx = new InitialContext();