How to write EJB 3.1 clients on JBOSS 7.1
EJB invocation from a remote client using JNDI
- Deploy the EJBs on the server
- Create a Initial Context instance by specifying the following properties
- name = java.naming.factory.url.pkgs
- value = org.jboss.ejb.client.naming
public class JndiLookUp {
private static Context initialContext;
private static final String PKG_INTERFACES = "org.jboss.ejb.client.naming";
public static Context getInitialContext() throws NamingException {
if (initialContext == null) {
Properties properties = new Properties();
properties.put(Context.URL_PKG_PREFIXES, PKG_INTERFACES);
// properties.put("jboss.naming.client.ejb.context", true);
initialContext = new InitialContext(properties);
}
return initialContext;
}
}
3. Create a new file with name 'jboss-ejb-client.properties' and add it the ejb module class path. It is at same level as META-INF directory of ejbmodule
4. Add the following properties to the jboss-ejb-client.properties file
remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false
remote.connections=default
remote.connection.default.host=localhost
remote.connection.default.port=4447
remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false
remote.connection.default.username=nitesh
remote.connection.default.password=nk
username and password properties are required from JBOSS 7.1 hence. These names can be create be add-user.bat utility at JBOSS_HOME/bin.
5. Add jboss-client.jar to the project class path. This jar can be found at:
JBOSS_HOME/bin/client/jboss-client-7.1.0.Final.jar
With the above steps we are ready to write the client code.
public class EjbClient {
RemoteCounter counter = (RemoteCounter) doLookup( SingletonCounterBean.class, RemoteCounter.class );
System.out.println("count"+ counter.getTheValue() );
System.out.println( counter.increment() );
}
private static Object doLookup( Class<?> beanClz, Class<?> interfaceClz ) {
Context context = null;
Object bean = null;
try {
// 1. Obtaining Context
context = JndiLookUp.getInitialContext();
// 2. Generate JNDI Lookup name
String lookupName = getLookupName(beanClz, interfaceClz );
// 3. Lookup and cast
bean = context.lookup(lookupName);
} catch (NamingException e) {
e.printStackTrace();
}
return bean;
}
private static String getLookupName( Class<?> beanClz, Class<?> interfaceClz) {
/*The app name is the EAR name of the deployed EJB without .ear
suffix. Since we haven't deployed the application as a .ear, the app
name for us will be an empty string */
String appName = "ejbprojear";
/* The module name is the JAR name of the deployed EJB without the
.jar suffix.*/
String moduleName = "ejbproj1";
/* AS7 allows each deployment to have an (optional) distinct name.
This can be an empty string if distinct name is not specified.*/
String distinctName = "";
// The EJB bean implementation class name
String beanName = beanClz.getSimpleName();
System.out.println("Simple name =" + beanName );
// Fully qualified remote interface name
final String interfaceName = interfaceClz.getName();
// Create a look up string name
String name = "ejb:" + appName + "/" + moduleName + "/" +
distinctName + "/" + beanName + "!" + interfaceName;
return name;
}
}
Some useful links:
EJB invocation from a Remote server instance
Below tutorial explains how to invoke on EJBs deployed on one AS7 instance from another AS7 instance.
Some useful links.
