session bean -classcast exception
gayathri jayapalan
Greenhorn
Posts: 7
posted 10 years ago
I deployed example ear file in JBoss, Jboss gave class cast exception- portable remote object.
I am using RHEL 4
my profram is like this downloaded from net, example3.ear from roseindia.net. The code is like this
bean:
public class MyTestSessionBean
implements SessionBean
{
public void ejbCreate()
throws
CreateException
{
}
public String SayHello(){
String msg="Hello! I am Session Bean";
System.out.println(msg);
return msg;
}
public void setSessionContext( SessionContext aContext )
throws EJBException
{
}
public void ejbActivate()
throws EJBException
{
}
public void ejbPassivate()
throws EJBException
{
}
public void ejbRemove()
throws EJBException
{
}
}
servlet:
package test.session;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
public class SessionTestServlet extends HttpServlet {
MyTestSessionHome testSessionBean;
public void init(ServletConfig config) throws ServletException{
//Look up home interface
try {
InitialContext ctx = new InitialContext();
Object objref = ctx.lookup("ejb/test/MyTestSessionBean");
testSessionBean = (MyTestSessionHome)PortableRemoteObject.narrow(objref, MyTestSessionHome.class);
} catch (Exception NamingException) {
NamingException.printStackTrace();
}
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out;
response.setContentType("text/html");
String title = "EJB Example";
out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Hello World Servlet!</title>");
out.println("</head>");
out.println("<body>");
out.println("<p align=\"center\"><font size=\"4\" color=\"#000080\">Servlet Calling Session Bean</font></p>");
try{
MyTestSession beanRemote;
beanRemote = testSessionBean.create();
out.println("<p align=\"center\"> Message from Session Bean is: <b>" + beanRemote.SayHello() + "</b></p>");
beanRemote.remove();
}catch(Exception CreateException){
CreateException.printStackTrace();
}
out.println("<p align=\"center\"><a href=\"javascript:history.back()\">Go to Home</a></p>");
out.println("</body>");
out.println("</html>");
out.close();
}
public void destroy() {
System.out.println("Destroy");
}
}
ejb-jar.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<description>Example 3</description>
<display-name>Example 3</display-name>
<enterprise-beans>
<!-- Session Beans -->
<session id="test_MyTestSession">
<display-name>My Test Session Bean</display-name>
<ejb-name>test/MyTestSession</ejb-name>
<home>test.session.MyTestSessionHome</home>
<remote>test.session.MyTestSession</remote>
<ejb-class>test.session.MyTestSessionBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
<assembly-descriptor>
</assembly-descriptor>
</ejb-jar>
jboss.xml:
<jboss>
<enterprise-beans>
<session>
<ejb-name>test/MyTestSession</ejb-name>
<jndi-name>ejb/test/MyTestSessionBean</jndi-name>
</session>
</enterprise-beans>
<resource-managers>
</resource-managers>
</jboss>
i have set JBOSS_HOME, jdk path, class path to
JAVA_HOME= /usr/java/jdk1.5.0_11
PATH=/usr/java/jdk1.5.0_11/bin:$PATH
CLASSPATH=/usr/java/jdk1.5.0_11/lib:$CLASSPATH
JBOSS_HOME=/home/servers/java/jboss-4.0.5.GA
when i copy , i am getting exception in Jboss. I am unable to resolve this. Should i set any env varible, or jar should be included.
I am using RHEL 4
my profram is like this downloaded from net, example3.ear from roseindia.net. The code is like this
bean:
public class MyTestSessionBean
implements SessionBean
{
public void ejbCreate()
throws
CreateException
{
}
public String SayHello(){
String msg="Hello! I am Session Bean";
System.out.println(msg);
return msg;
}
public void setSessionContext( SessionContext aContext )
throws EJBException
{
}
public void ejbActivate()
throws EJBException
{
}
public void ejbPassivate()
throws EJBException
{
}
public void ejbRemove()
throws EJBException
{
}
}
servlet:
package test.session;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
public class SessionTestServlet extends HttpServlet {
MyTestSessionHome testSessionBean;
public void init(ServletConfig config) throws ServletException{
//Look up home interface
try {
InitialContext ctx = new InitialContext();
Object objref = ctx.lookup("ejb/test/MyTestSessionBean");
testSessionBean = (MyTestSessionHome)PortableRemoteObject.narrow(objref, MyTestSessionHome.class);
} catch (Exception NamingException) {
NamingException.printStackTrace();
}
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out;
response.setContentType("text/html");
String title = "EJB Example";
out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Hello World Servlet!</title>");
out.println("</head>");
out.println("<body>");
out.println("<p align=\"center\"><font size=\"4\" color=\"#000080\">Servlet Calling Session Bean</font></p>");
try{
MyTestSession beanRemote;
beanRemote = testSessionBean.create();
out.println("<p align=\"center\"> Message from Session Bean is: <b>" + beanRemote.SayHello() + "</b></p>");
beanRemote.remove();
}catch(Exception CreateException){
CreateException.printStackTrace();
}
out.println("<p align=\"center\"><a href=\"javascript:history.back()\">Go to Home</a></p>");
out.println("</body>");
out.println("</html>");
out.close();
}
public void destroy() {
System.out.println("Destroy");
}
}
ejb-jar.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<description>Example 3</description>
<display-name>Example 3</display-name>
<enterprise-beans>
<!-- Session Beans -->
<session id="test_MyTestSession">
<display-name>My Test Session Bean</display-name>
<ejb-name>test/MyTestSession</ejb-name>
<home>test.session.MyTestSessionHome</home>
<remote>test.session.MyTestSession</remote>
<ejb-class>test.session.MyTestSessionBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
<assembly-descriptor>
</assembly-descriptor>
</ejb-jar>
jboss.xml:
<jboss>
<enterprise-beans>
<session>
<ejb-name>test/MyTestSession</ejb-name>
<jndi-name>ejb/test/MyTestSessionBean</jndi-name>
</session>
</enterprise-beans>
<resource-managers>
</resource-managers>
</jboss>
i have set JBOSS_HOME, jdk path, class path to
JAVA_HOME= /usr/java/jdk1.5.0_11
PATH=/usr/java/jdk1.5.0_11/bin:$PATH
CLASSPATH=/usr/java/jdk1.5.0_11/lib:$CLASSPATH
JBOSS_HOME=/home/servers/java/jboss-4.0.5.GA
when i copy , i am getting exception in Jboss. I am unable to resolve this. Should i set any env varible, or jar should be included.
posted 10 years ago
Have a look at ClassCastExceptions, specifically the jmx-console method mentioned over there.
gayathri jayapalan
Greenhorn
Posts: 7
posted 10 years ago
In the jboss this is the error:
java.lang.ClassCastException
[STDERR] at com.sun.corba.se.impl.javax.rmi.PortableRemot eObject.narrow(PortableRemoteObject.java:229)
at javax.rmi.PortableRemoteObject.narrow(Portabl eRemoteObject.java:137)
at test.session.SessionTestServlet.init(SessionT estServlet.java:29)
at org.apache.catalina.core.StandardWrapper.load Servlet(StandardWrapper.java:1105)
java.lang.ClassCastException
[STDERR] at com.sun.corba.se.impl.javax.rmi.PortableRemot eObject.narrow(PortableRemoteObject.java:229)
at javax.rmi.PortableRemoteObject.narrow(Portabl eRemoteObject.java:137)
at test.session.SessionTestServlet.init(SessionT estServlet.java:29)
at org.apache.catalina.core.StandardWrapper.load Servlet(StandardWrapper.java:1105)
gayathri jayapalan
Greenhorn
Posts: 7
posted 10 years ago
I have found the problem. i don't know how to resolve it.
The JDK which i have installed is jdk1.0.5_11
In this rt.jar has 2 Portable object classes at
1.at com.sun.corba.se.impl.javax.rmi.PortableRemot eobject.narrow(PortableRemoteObject.java:229)
2.at javax.rmi.PortableRemoteObject.narrow(Portabl eRemoteObject.java:137)
That is y when i copy the bean it was giving this exception. i need soln for this
The JDK which i have installed is jdk1.0.5_11
In this rt.jar has 2 Portable object classes at
1.at com.sun.corba.se.impl.javax.rmi.PortableRemot eobject.narrow(PortableRemoteObject.java:229)
2.at javax.rmi.PortableRemoteObject.narrow(Portabl eRemoteObject.java:137)
That is y when i copy the bean it was giving this exception. i need soln for this
posted 10 years ago
1. Are you sure that the object at "ejb/test/MyTestSessionBean" is of type "MyTestSessionHome" ?
2. Are you sure there is a jndi-name tag allowed in the session tag ?
2. Are you sure there is a jndi-name tag allowed in the session tag ?
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gayathri jayapalan
Greenhorn
Posts: 7
posted 10 years ago
[root@gayathri bin]# ./run.sh
run.sh: Missing file: /lib/tools.jar
run.sh: Unexpected results may occur. Make sure JAVA_HOME points to a JDK and not a JRE.
=========================================================================
JBoss Bootstrap Environment
JBOSS_HOME: /home/servers/java/jboss-4.0.5.GA-src/build/output/jboss-4.0.5.GA
JAVA: java
JAVA_OPTS: -Dprogram.name=run.sh -server -Xms128m -Xmx512m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000
CLASSPATH: /home/servers/java/jboss-4.0.5.GA-src/build/output/jboss-4.0.5.GA/bin/run.jar:/lib/tools.jar
=========================================================================
Is it not finding tools.jar
run.sh: Missing file: /lib/tools.jar
run.sh: Unexpected results may occur. Make sure JAVA_HOME points to a JDK and not a JRE.
=========================================================================
JBoss Bootstrap Environment
JBOSS_HOME: /home/servers/java/jboss-4.0.5.GA-src/build/output/jboss-4.0.5.GA
JAVA: java
JAVA_OPTS: -Dprogram.name=run.sh -server -Xms128m -Xmx512m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000
CLASSPATH: /home/servers/java/jboss-4.0.5.GA-src/build/output/jboss-4.0.5.GA/bin/run.jar:/lib/tools.jar
=========================================================================
Is it not finding tools.jar
gayathri jayapalan
Greenhorn
Posts: 7
gayathri jayapalan
Greenhorn
Posts: 7
posted 10 years ago
When i deploy a session bean in JBoss, while deploying i got classcast exception . When i am looking thro ctxlook up, it is always returing the object ref as JNDI name+Home. why this error is coming? i need help.
servlet code
THis is the output in Jboss:
393 INFO [STDOUT] bbbbbbbbbejb/test/MyTestSessionBean/remoteHome
11:43:38,408 ERROR [STDERR] java.lang.ClassCastException
11:43:38,413 ERROR [STDERR] at com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:293)
If the code is like this in the lookup:
Object objref = ctx.lookup("ejb/test/MyTestSessionBean");
It returns objref like this:MyTestSessionBeanHome - This class does not exist.
I need help.
servlet code
THis is the output in Jboss:
393 INFO [STDOUT] bbbbbbbbbejb/test/MyTestSessionBean/remoteHome
11:43:38,408 ERROR [STDERR] java.lang.ClassCastException
11:43:38,413 ERROR [STDERR] at com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:293)
If the code is like this in the lookup:
Object objref = ctx.lookup("ejb/test/MyTestSessionBean");
It returns objref like this:MyTestSessionBeanHome - This class does not exist.
I need help.
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