I'm a beginner and would like to run some JBoss EJB 3.0 examples:
Calculator (Stateless SessionBean) - OK!
ShoppingCart (Stateful SessionBean) - ClassCastException
Environment:
o Java 1.5.0_09
o IntelliJ IDEA 6.0.4
o JBoss 4.0.5 AS (JEMS Installer with ejb3)
o Windows XP SP2
Interfaces:
| @Local
| @Remote
| public interface Calculator {
| int add(int x, int y);
| int subtract(int x, int y);
| }
|
| @Local
| @Remote
| public interface ShoppingCart {
| void buy(String product, int quantity);
| HashMap<String, Integer> getCartContents();
| }
|
SessionBeans:
| @Stateless
| public class CalculatorBean implements Calculator {
| public int add(int x, int y) {
| return x + y;
| }
|
| public int subtract(int x, int y) {
| return x - y;
| }
| }
|
| @Stateful
| public class ShoppingCartBean implements ShoppingCart {
| private HashMap<String, Integer> cart;
|
| public ShoppingCartBean() {
| cart = new HashMap<String, Integer>();
| }
|
| public void buy(String product, int quantity) {
| if (cart.containsKey(product)) {
| int currq = cart.get(product);
| currq += quantity;
| cart.put(product, currq);
| } else {
| cart.put(product, quantity);
| }
| }
|
| public HashMap<String, Integer> getCartContents() {
| return cart;
| }
| }
|
Client:
| public class Client {
| public static void main(String[] args) throws Exception {
| System.setSecurityManager(new RMISecurityManager());
|
| InitialContext ctx = new InitialContext();
| ctx.addToEnvironment(Context.INITIAL_CONTEXT_FACTORY,
"org.jnp.interfaces.NamingContextFactory");
| ctx.addToEnvironment(Context.URL_PKG_PREFIXES,
"org.jboss.naming:org.jnp.interfaces");
| ctx.addToEnvironment(Context.PROVIDER_URL, "jnp://localhost:1099");
|
| Calculator calculator = (Calculator)
ctx.lookup("MyApplication/CalculatorBean/remote");
|
| System.out.println("1 + 1 = " + calculator.add(1, 1));
| System.out.println("1 - 1 = " + calculator.subtract(1, 1));
| }
| }
|
| public class Client {
| public static void main(String[] args) throws Exception {
| System.setSecurityManager(new RMISecurityManager());
|
| InitialContext ctx = new InitialContext();
| ctx.addToEnvironment(Context.INITIAL_CONTEXT_FACTORY,
"org.jnp.interfaces.NamingContextFactory");
| ctx.addToEnvironment(Context.URL_PKG_PREFIXES,
"org.jboss.naming:org.jnp.interfaces");
| ctx.addToEnvironment(Context.PROVIDER_URL, "jnp://localhost:1099");
|
| ShoppingCart cart = (ShoppingCart)
ctx.lookup("MyApplication/ShoppingCartBean/remote");
| }
| }
|
Policy:
| grant {
| permission java.security.AllPermission;
| };
|
JBoss LOG:
| [...]
| 16:34:50,404 INFO [JmxKernelAbstraction] installing MBean:
jboss.j2ee:ear=MyApplication.ear,jar=MyEjb.jar,name=ShoppingCartBean,service=EJB3
with dependencies:
| 16:34:50,419 INFO [EJBContainer] STARTED EJB:
org.jboss.tutorial.stateful.bean.ShoppingCartBean ejbName: ShoppingCartBean
| 16:34:50,466 INFO [SimpleStatefulCache] Initializing SimpleStatefulCache
with maxSize: 100000 timeout: 300 for
jboss.j2ee:ear=MyApplication.ear,jar=MyEjb.jar,name=ShoppingCartBean,service=EJB3
| 16:34:50,466 INFO [JmxKernelAbstraction] installing MBean:
jboss.j2ee:ear=MyApplication.ear,jar=MyEjb.jar,name=CalculatorBean,service=EJB3
with dependencies:
| 16:34:50,466 INFO [EJBContainer] STARTED EJB:
org.jboss.tutorial.stateless.bean.CalculatorBean ejbName: CalculatorBean
| [...]
|
Command:
| java \
| -Djava.security.policy=java.policy \
| -classpath jbossall-client.jar;jboss-aop-jdk50-client.jar" \
| org.jboss.tutorial.stateless.client.Client
|
| 1 + 1 = 2
| 1 - 1 = 0
|
| java \
| -Djava.security.policy=java.policy \
| -classpath jbossall-client.jar;jboss-aop-jdk50-client.jar" \
| org.jboss.tutorial.stateful.client.Client
|
| Exception in thread "main" java.lang.ClassCastException:
javax.naming.Reference
| at org.jboss.tutorial.stateful.client.Client.main(Client.java:20)
|
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