EJB vs. Beans in JSPs
Please help me understand how enterprise javabeans differ from javabean component in JSP.
Please help me understand how enterprise javabeans
differ from javabean component in JSP.You can refer the URL,
http://www-106.ibm.com/developerworks/java/library/javabeans-enterprise-javabeans.html?dwzone=java
to find the similarities between Java bean and EJB.
Absolutely there will not be any difference between the usage of java bean or ejbs in your JSP. JSP is primarily meant for creating dynamic web content. It doesn't matter whether it gets data from a simple java bean or from an EJB.
But, whether to go for java bean or EJB depends on your business logic and the services what ejb container provides you. It is easier to use simple java beans from your JSP (as long as the ejb is not a session ejb). You can refer MVC design architecture too, which is available in the internet or in the Sun's blueprints.
Hope this helps.
Similar Messages
-
What role can ejb Session Beans play jsp session tracking
I am also looking for a way to use JSP as ejb client with WLS5.1. i would appreciate any help.
-Girish
Prasad Peddada <[email protected]> wrote:
>David,
> The beans which are refered in jsp specs are java beans and not EJB.
>
>Prasad
>
>David Levy wrote:
>>
>> Hello,
>>
>> We are using Jsp/Servlets which will hold session state and subsequently
>> call ejb Session Beans for transaction/persistence coordination . We are
>> not sure if we are using the correct techniques to control object memory.
>>
>> Summary of what we have:
>>
>> A jsp with the "useBean" directive:
>> <jsp:useBean id="MySession" class="com....MySession"
>> scope="session"></jsp:useBean>
>>
>> The class MySession holds other classes ( all serializable).
>> The class MySession is NOT an ejb Session Bean
>>
>> Questions:
>> We are considering making class MySession an ejb Session Bean so (via it's
>> passivate/activate feature) we can control instances in memory as more web
>> clients start the session from the jsp page. I.E. all web clients will have
>> their own HttpSession instance which holds on to an ejb Session Bean object
>> "MySession"( or a passivated representation of it)
>>
>> 1) Is this a sufficient approach or will there be other memory concerns?
>> I.E. What about all the HttpSession objects out there? Do they need to be
>> passivated as well?
>>
>> 2) If its a good idea to passivate the HttpSessions as well, then what
>> mechanism should be used ( servlet session persistence)? Also, if we are
>> passivating the HttpSession (which holds on to the MySession object graph)
>> , then why bother with the SessionBean for passivation
>>
>> 3) Currently, we only have a single instance of a servlet handling all
>> requests. Will multiple instances buy us anything?
>>
>> 4) How does clustering relate to this topic?
>>
>> 5) Can we change the "jsp:useBean" directive so MySession is an ejb Session
>> Bean or do we have to do the "home.create()" within a jsp script?
>>
>> thanks,
>> dave
-
BC4J, JSP, accesing a remote app module deployed as an 8i EJB session bean
hi everybody,
i am reposting this question since the thread went somewhat off-topic ...
i have successfully deployed my Jdev 3.2 developed app module to my remote 8.1.7 db server as an EJB session bean
i am able to test it via the Business Components Tester ...
i am also able to test it from my wizard-generated Business Components JSP App using DataWebBeans ...
but when i try to access it from a JSP data tag page I get the following error:
Excepcisn:
javax.servlet.jsp.JspException: JBO-28300: Piggyback read error
void periodoswebtags_html.PeriodoView_Browse._jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void oracle.jsp.runtime.HttpJsp.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void oracle.jsp.app.JspApplication.dispatchRequest(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void oracle.jsp.JspServlet.doDispatch(oracle.jsp.app.JspRequestContext)
void oracle.jsp.JspServlet.internalService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void oracle.jsp.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void oracle.lite.web.JupServlet.service(oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
void oracle.lite.web.MimeServletHandler.handle(oracle.lite.web.JupApplication, java.lang.String, int, oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
void oracle.lite.web.JupApplication.service(oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
void oracle.lite.web.JupHandler.handle(oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
void oracle.lite.web.HTTPServer.process(oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
boolean oracle.lite.web.HTTPServer.handleRequest(oracle.lite.web.JupInputStream, oracle.lite.web.JupOutputStream)
boolean oracle.lite.web.JupServer.handle(oracle.lite.web.JupInputStream, oracle.lite.web.JupOutputStream)
void oracle.lite.web.SocketListener.process(java.net.Socket)
void oracle.lite.web.SocketListener$ReqHandler.run()
and the JBO-28300 error is undocumented ... :(
i have included a library containing the <mybcs>CommonEJB.jar and <myappmodule>EJBClient.jar files into my JSP projects
the JSP data tag page is a wizard-generated trivial browse page
TIA,
phi everybody,
just fixed ... :) ...
i added the following libraries to my JSP data tag project and everythig works fine ...
Oracle XML Parser 2.0
JBO Runtime
SQLJ Runtime
HTH,
p -
Always fail to deploy to server when (Create a Simple EJB Session Bean )
Hi,
I'm trying the "Oracle JDeveloper 11g Tutorials" - "Create a Simple EJB Session Bean", I just follow the instructions in that page. But when I tried to run it, it always failed. Can anyone help me to have a look. I paste the log below. thank you.
There's an error in the log "java.lang.ClassNotFoundException: oracle.security.jps.wls.listeners.JpsApplicationLifecycleListener". but I don't know what's that meaning.
E:\Oracle\Middleware\jdeveloper\system\system11.1.1.0.31.51.56\DefaultDomain\bin\startWebLogic.cmd
[waiting for the server to complete its initialization...]
JAVA Memory arguments: -Xms256m -Xmx512m -XX:CompileThreshold=8000 -XX:PermSize=48m -XX:MaxPermSize=128m
WLS Start Mode=Development
CLASSPATH=;e:\Oracle\MIDDLE~1\patch_wls1030\profiles\default\sys_manifest_classpath\weblogic_patch.jar;e:\Oracle\MIDDLE~1\patch_jdev1111\profiles\default\sys_manifest_classpath\weblogic_patch.jar;e:\Oracle\MIDDLE~1\patch_cie660\profiles\default\sys_manifest_classpath\weblogic_patch.jar;e:\Oracle\MIDDLE~1\JDK160~1\lib\tools.jar;E:\Oracle\MIDDLE~1\WLSERV~1.3\server\lib\weblogic_sp.jar;E:\Oracle\MIDDLE~1\WLSERV~1.3\server\lib\weblogic.jar;e:\Oracle\MIDDLE~1\modules\features\weblogic.server.modules_10.3.0.0.jar;E:\Oracle\MIDDLE~1\WLSERV~1.3\server\lib\webservices.jar;e:\Oracle\MIDDLE~1\modules\ORGAPA~1.5/lib/ant-all.jar;e:\Oracle\MIDDLE~1\modules\NETSFA~1.0_1/lib/ant-contrib.jar;;E:\Oracle\MIDDLE~1\WLSERV~1.3\common\eval\pointbase\lib\pbclient57.jar;E:\Oracle\MIDDLE~1\WLSERV~1.3\server\lib\xqrl.jar;;
PATH=e:\Oracle\MIDDLE~1\patch_wls1030\profiles\default\native;e:\Oracle\MIDDLE~1\patch_jdev1111\profiles\default\native;e:\Oracle\MIDDLE~1\patch_cie660\profiles\default\native;E:\Oracle\MIDDLE~1\WLSERV~1.3\server\native\win\32;E:\Oracle\MIDDLE~1\WLSERV~1.3\server\bin;e:\Oracle\MIDDLE~1\modules\ORGAPA~1.5\bin;e:\Oracle\MIDDLE~1\JDK160~1\jre\bin;e:\Oracle\MIDDLE~1\JDK160~1\bin;C:\oracle\product\10.2.0\client_1\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;G:\D\JACKYH\Installed\apache-ant-1.7.1\bin;C:\Program Files\TortoiseSVN\bin;C:\Program Files\CollabNet Subversion;U:.;V:.;E:\Oracle\MIDDLE~1\WLSERV~1.3\server\native\win\32\oci920_8
* To start WebLogic Server, use a username and *
* password assigned to an admin-level user. For *
* server administration, use the WebLogic Server *
* console at http:\\hostname:port\console *
starting weblogic with Java version:
java version "1.6.0_05"
Java(TM) SE Runtime Environment (build 1.6.0_05-b13)
Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode)
Starting WLS with line:
e:\Oracle\MIDDLE~1\JDK160~1\bin\java -client -Xms256m -Xmx512m -XX:CompileThreshold=8000 -XX:PermSize=48m -XX:MaxPermSize=128m -DproxySet=false -Djbo.34010=false -Xverify:none -da -Dplatform.home=E:\Oracle\MIDDLE~1\WLSERV~1.3 -Dwls.home=E:\Oracle\MIDDLE~1\WLSERV~1.3\server -Dweblogic.home=E:\Oracle\MIDDLE~1\WLSERV~1.3\server -Dweblogic.management.discover=true -Dwlw.iterativeDev= -Dwlw.testConsole= -Dwlw.logErrorsToConsole= -Dweblogic.ext.dirs=e:\Oracle\MIDDLE~1\patch_wls1030\profiles\default\sysext_manifest_classpath;e:\Oracle\MIDDLE~1\patch_jdev1111\profiles\default\sysext_manifest_classpath;e:\Oracle\MIDDLE~1\patch_cie660\profiles\default\sysext_manifest_classpath -Dweblogic.Name=DefaultServer -Djava.security.policy=E:\Oracle\MIDDLE~1\WLSERV~1.3\server\lib\weblogic.policy weblogic.Server
<12/11/2008 10:54:31 AM EST> <Notice> <WebLogicServer> <BEA-000395> <Following extensions directory contents added to the end of the classpath:
E:\Oracle\Middleware\patch_wls1030\profiles\default\sysext_manifest_classpath\weblogic_ext_patch.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\beehive_ja.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\beehive_ko.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\beehive_zh_CN.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\beehive_zh_TW.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\p13n_wls_ja.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\p13n_wls_ko.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\p13n_wls_zh_CN.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\p13n_wls_zh_TW.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\testclient_ja.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\testclient_ko.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\testclient_zh_CN.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\testclient_zh_TW.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\tuxedocontrol_ja.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\tuxedocontrol_ko.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\tuxedocontrol_zh_CN.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\tuxedocontrol_zh_TW.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\workshop_ja.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\workshop_ko.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\workshop_zh_CN.jar;E:\Oracle\Middleware\wlserver_10.3\L10N\workshop_zh_TW.jar>
<12/11/2008 10:54:32 AM EST> <Info> <WebLogicServer> <BEA-000377> <Starting WebLogic Server with Java HotSpot(TM) Client VM Version 10.0-b19 from Sun Microsystems Inc.>
<12/11/2008 10:54:32 AM EST> <Info> <Management> <BEA-141107> <Version: WebLogic Server Temporary Patch for CR380042 Thu Sep 11 13:33:40 PDT 2008
WebLogic Server Temporary Patch for 7372756 Fri Sep 12 17:05:44 EDT 2008
WebLogic Server 10.3 Mon Aug 18 22:39:18 EDT 2008 1142987 >
<12/11/2008 10:54:33 AM EST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING>
<12/11/2008 10:54:33 AM EST> <Info> <WorkManager> <BEA-002900> <Initializing self-tuning thread pool>
<12/11/2008 10:54:34 AM EST> <Notice> <Log Management> <BEA-170019> <The server log file E:\Oracle\Middleware\jdeveloper\system\system11.1.1.0.31.51.56\DefaultDomain\servers\DefaultServer\logs\DefaultServer.log is opened. All server side log events will be written to this file.>
<12/11/2008 10:54:36 AM EST> <Notice> <Security> <BEA-090082> <Security initializing using security realm myrealm.>
<12/11/2008 10:54:38 AM EST> <Warning> <Deployer> <BEA-149617> <Non-critical internal application uddi was not deployed. Error: [Deployer:149158]No application files exist at 'E:\Oracle\MIDDLE~1\WLSERV~1.3\server\lib\uddi.war'.>
<12/11/2008 10:54:38 AM EST> <Warning> <Deployer> <BEA-149617> <Non-critical internal application uddiexplorer was not deployed. Error: [Deployer:149158]No application files exist at 'E:\Oracle\MIDDLE~1\WLSERV~1.3\server\lib\uddiexplorer.war'.>
<12/11/2008 10:54:39 AM EST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STANDBY>
<12/11/2008 10:54:39 AM EST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING>
<12/11/2008 10:54:39 AM EST> <Notice> <Log Management> <BEA-170027> <The Server has established connection with the Domain level Diagnostic Service successfully.>
<12/11/2008 10:54:39 AM EST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to ADMIN>
<12/11/2008 10:54:39 AM EST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to RESUMING>
<12/11/2008 10:54:39 AM EST> <Notice> <Server> <BEA-002613> <Channel "Default[1]" is now listening on 127.0.0.1:7101 for protocols iiop, t3, ldap, snmp, http.>
<12/11/2008 10:54:39 AM EST> <Notice> <Server> <BEA-002613> <Channel "Default" is now listening on 192.168.12.54:7101 for protocols iiop, t3, ldap, snmp, http.>
<12/11/2008 10:54:39 AM EST> <Notice> <WebLogicServer> <BEA-000331> <Started WebLogic Admin Server "DefaultServer" for domain "DefaultDomain" running in Development Mode>
<12/11/2008 10:54:39 AM EST> <Warning> <Server> <BEA-002611> <Hostname "jackyh.dst.com.au", maps to multiple IP addresses: 192.168.12.54, 127.0.0.1>
<12/11/2008 10:54:39 AM EST> <Warning> <Server> <BEA-002611> <Hostname "localhost", maps to multiple IP addresses: 192.168.12.54, 127.0.0.1>
<12/11/2008 10:54:39 AM EST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to RUNNING>
<12/11/2008 10:54:39 AM EST> <Notice> <WebLogicServer> <BEA-000360> <Server started in RUNNING mode>
DefaultServer startup time: 13829 ms.
DefaultServer started.
[Running application SessionEJB on Server Instance DefaultServer...]
---- Deployment started. ---- 12/11/2008 10:54:43
Target platform is (Weblogic 10.3).
Running dependency analysis...
2008-11-12 10:54:43.882: Writing EJB JAR file to E:\Oracle\Middleware\jdeveloper\system\system11.1.1.0.31.51.56\o.j2ee\drs\SessionEJB\SessionEJB-Project1-ejb
2008-11-12 10:54:43.914: Wrote EJB JAR file to E:\Oracle\Middleware\jdeveloper\system\system11.1.1.0.31.51.56\o.j2ee\drs\SessionEJB\SessionEJB-Project1-ejb
2008-11-12 10:54:44.148: Writing EAR file to E:\Oracle\Middleware\jdeveloper\system\system11.1.1.0.31.51.56\o.j2ee\drs\SessionEJB
2008-11-12 10:54:44.164: Wrote EAR file to E:\Oracle\Middleware\jdeveloper\system\system11.1.1.0.31.51.56\o.j2ee\drs\SessionEJB
Deploying Application...
<12/11/2008 10:54:46 AM EST> <Error> <Deployer> <BEA-149265> <Failure occurred in the execution of deployment request with ID '1226447686226' for task '0'. Error is: 'weblogic.management.DeploymentException: '
weblogic.management.DeploymentException:
at weblogic.application.internal.flow.BaseLifecycleFlow$CreateListenerAction.run(BaseLifecycleFlow.java:171)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(Unknown Source)
at weblogic.application.internal.flow.BaseLifecycleFlow$BaseAction.invoke(BaseLifecycleFlow.java:99)
at weblogic.application.internal.flow.HeadLifecycleFlow.createListener(HeadLifecycleFlow.java:117)
Truncated. see log file for complete stacktrace
java.lang.ClassNotFoundException: oracle.security.jps.wls.listeners.JpsApplicationLifecycleListener
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:283)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:256)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:176)
Truncated. see log file for complete stacktrace
>
<12/11/2008 10:54:46 AM EST> <Warning> <Deployer> <BEA-149004> <Failures were detected while initiating deploy task for application 'SessionEJB'.>
<12/11/2008 10:54:46 AM EST> <Warning> <Deployer> <BEA-149078> <Stack trace for message 149004
weblogic.management.DeploymentException:
at weblogic.application.internal.flow.BaseLifecycleFlow$CreateListenerAction.run(BaseLifecycleFlow.java:171)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(Unknown Source)
at weblogic.application.internal.flow.BaseLifecycleFlow$BaseAction.invoke(BaseLifecycleFlow.java:99)
at weblogic.application.internal.flow.HeadLifecycleFlow.createListener(HeadLifecycleFlow.java:117)
Truncated. see log file for complete stacktrace
java.lang.ClassNotFoundException: oracle.security.jps.wls.listeners.JpsApplicationLifecycleListener
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:283)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:256)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:176)
Truncated. see log file for complete stacktrace
>
[Deployer:149034]An exception occurred for task [Deployer:149026]deploy application SessionEJB on DefaultServer.: .
weblogic.management.DeploymentException:
#### Deployment incomplete. #### 12/11/2008 10:54:46
oracle.jdeveloper.deploy.DeployException
at oracle.jdevimpl.deploy.common.Jsr88RemoteDeployer.doDeploymentAction(Jsr88RemoteDeployer.java:247)
at oracle.jdevimpl.deploy.common.Jsr88RemoteDeployer.deployImpl(Jsr88RemoteDeployer.java:157)
at oracle.jdeveloper.deploy.common.AbstractDeployer.deploy(AbstractDeployer.java:94)
at oracle.jdevimpl.deploy.fwk.WrappedDeployer.deployImpl(WrappedDeployer.java:39)
at oracle.jdeveloper.deploy.common.AbstractDeployer.deploy(AbstractDeployer.java:94)
at oracle.jdeveloper.deploy.common.BatchDeployer.deployImpl(BatchDeployer.java:82)
at oracle.jdeveloper.deploy.common.AbstractDeployer.deploy(AbstractDeployer.java:94)
at oracle.jdevimpl.deploy.fwk.WrappedDeployer.deployImpl(WrappedDeployer.java:39)
at oracle.jdeveloper.deploy.common.AbstractDeployer.deploy(AbstractDeployer.java:94)
at oracle.jdevimpl.deploy.fwk.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:436)
at oracle.jdeveloper.deploy.DeploymentManager.deploy(DeploymentManager.java:209)
at oracle.jdevimpl.runner.adrs.AdrsStarter$4$1.run(AdrsStarter.java:1316)
Caused by: oracle.jdeveloper.deploy.DeployException
at oracle.jdevimpl.deploy.common.Jsr88DeploymentHelper.deployApplication(Jsr88DeploymentHelper.java:413)
at oracle.jdevimpl.deploy.common.Jsr88RemoteDeployer.doDeploymentAction(Jsr88RemoteDeployer.java:238)
... 11 more
Caused by: oracle.jdeveloper.deploy.DeployException: Deployment Failed
at oracle.jdevimpl.deploy.common.Jsr88DeploymentHelper.deployApplication(Jsr88DeploymentHelper.java:395)
... 12 more
#### Cannot run application SessionEJB due to error deploying to DefaultServer.
[Application SessionEJB stopped and undeployed from Server Instance DefaultServer]Steve,
I'm facing the same issue as user#####.
Your workaround does not work ; when I deploy manuelly the ear file, with a new weblogic-application.xml, I get the same error.
Does that happen a lot ? :p
Edit :
my web.xml :
<?xml version = '1.0' encoding = 'windows-1252'?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">
<description>Empty web.xml file for Web Application</description>
<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>client</param-value>
</context-param>
<context-param>
<description>If this parameter is true, there will be an automatic check of the modification date of your JSPs, and saved state will be discarded when JSP's change. It will also automatically check if your skinning css files have changed without you having to restart the server. This makes development easier, but adds overhead. For this reason this parameter should be set to false when your application is deployed.</description>
<param-name>org.apache.myfaces.trinidad.CHECK_FILE_MODIFICATION</param-name>
<param-value>false</param-value>
</context-param>
<context-param>
<description>Whether the 'Generated by...' comment at the bottom of ADF Faces HTML pages should contain version number information.</description>
<param-name>oracle.adf.view.rich.versionString.HIDDEN</param-name>
<param-value>false</param-value>
</context-param>
<filter>
<filter-name>JpsFilter</filter-name>
<filter-class>oracle.security.jps.ee.http.JpsFilter</filter-class>
</filter>
<filter>
<filter-name>trinidad</filter-name>
<filter-class>org.apache.myfaces.trinidad.webapp.TrinidadFilter</filter-class>
</filter>
<filter>
<filter-name>adfBindings</filter-name>
<filter-class>oracle.adf.model.servlet.ADFBindingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>JpsFilter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
<dispatcher>FORWARD</dispatcher>
<dispatcher>REQUEST</dispatcher>
<dispatcher>INCLUDE</dispatcher>
</filter-mapping>
<filter-mapping>
<filter-name>trinidad</filter-name>
<servlet-name>Faces Servlet</servlet-name>
<dispatcher>FORWARD</dispatcher>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>
<filter-mapping>
<filter-name>adfBindings</filter-name>
<servlet-name>Faces Servlet</servlet-name>
<dispatcher>FORWARD</dispatcher>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet>
<servlet-name>resources</servlet-name>
<servlet-class>org.apache.myfaces.trinidad.webapp.ResourceServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>resources</servlet-name>
<url-pattern>/adf/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>resources</servlet-name>
<url-pattern>/afr/*</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>35</session-timeout>
</session-config>
<mime-mapping>
<extension>html</extension>
<mime-type>text/html</mime-type>
</mime-mapping>
<mime-mapping>
<extension>txt</extension>
<mime-type>text/plain</mime-type>
</mime-mapping>
</web-app>Luc-
Edited by: Lucas Ismag on 4 déc. 2008 05:33 -
Calling Session Beans in JSP ?
Hi Folks,
I am new to EJB3, I am doing simple applicatuions.
Can any one please tell me how to call session beans in jsp page.
for example my case is.. iam entering two diffrent data, lets say user name and password in jsp page and this should go in data base thru JPA (entity beans)
Iam able to enter data from JPA in data base but if the same i have to fetch from JSP page.. iam not getting..!
I would really appretiate for your help i need it urgent...!
thanks in advance.abishek1983 wrote:
Hi Folks,
I am new to EJB3, I am doing simple applicatuions.
Can any one please tell me how to call session beans in jsp page.
Not. You can, technically, but you shouldn't. JSP should be for display purposes only, containing no Java code whatsoever.
for example my case is.. iam entering two diffrent data,Wrong. You cannot possibly have "2 data", the very concept is impossible.
You can have "2 data items" which is probably what you intended to say?
lets say user name and password in jsp page and this should go in data base thru JPA (entity beans)
Iam able to enter data from JPA in data base but if the same i have to fetch from JSP page.. iam not getting..!
Same way you insert them. Of course JPA entities are distinctly different from entity beans. The very concept of entity beans no longer exists in the context of JPA, it's solely used to mean EJB 2.1 or earlier entity beans.
I would really appretiate for your help i need it urgent...!
It's not urgent. -
How to pass submitted Data from a servlet to EJB Session Bean in JPA
How to pass Data User submitted Data from a servlet to EJB Session Bean when using JPA :
Hi ,
I have a jsp page in which the user fills up the Data and submits it to the servlet :
Inside servlets i am getting all the parameters and setting it to the Entity Class .
Sample Entity class is shown below :
@Entity
public class Employee {
@Id private int id;
private String name;
public Employee() {}
public Employee(int id) { this.id = id; }
public int getId() { return id; }
public void setId(int id) { this.id = id; }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
}After calling setters of my Entity Class .
I am using JNDI lookup to call my session Bean method and pass this Entity class to the session Bean to persist data
Please let me know what will be the right approach :
1. Passing parameters whole as a Entity Class
that is
public void insertData(Employee emp)
}Or
2. public void insertData(String Name , int ID)
}they are both right as they both work. Easy huh?
You might argue that if you have to set a lot of fields, use the entity as otherwise you get a method with a gigantic amount of parameters. -
Deploying App Module as EJB Session Bean to JBoss
I am attempting to follow the How-To at
http://otn.oracle.com/products/jdev/howtos/appservers/deploy_bc4j_to_jboss.html for deploying BC4J to JBoss. In particular, I was looking at the section 'BC4J as an EJB Session Bean', because that is the route we would like to take.
The document instructs you to create a business components deployment profile.. ok, done.
It then instructs you to copy the app module configuration that was just created and rename it. However, the editor will not let you rename the configuration.
Then when 'Creating a JSP to Access Your Application Module as a EJB', the wizard to create the JSP will not allow you to select the app module configuration that was just created. It only shows the Local configuration.
What am I doing wrong? I am using JDeveloper 9.0.3.1.
My ultimate goal is to take an existing BC4J/JSP application and deploy the app module as an EJB, so the JSP and EJB can reside on separate machines.
Any pointers that anyone can give me about deploying an app module as a Session Facade (BMT) to JBoss, with a JSP front end, is greatly appreciated. I have read the how-tos available from OTN. I have relatively little experience with EJB, so please forgive me if there's something obvious I'm missing.
Thanks!!!Can this be solved by application module pooling? How
can we use the PoolMgr to work with the session
beans?You can use a stateless checkout/checkin appmodule.
Take a look at the following help topics which explain this in good detail.
"About Application Module Pooling"
"About JSP Pages and Application Module Pooling"
The pool can help reuse the appmodule instance across requests thus reducing the number of concurrent db sessions.
Dhiraj -
What is the difference between java direct or java bean in JSP?
What is the difference if I use java code directly in JSP or use java bean in JSP?
Which class to use for receiving the passed parameter from html or java script? Any difference for java code and java bean in the way receiving the passed data?
How can I pass string from jsp to html or java script?it's generally accepted as better design to separate presentation from logic. meaning, the java code in the jsp should be used to support displaying data, as oppsoed to implementing the application - like database access, etc.
when the logic is separated from the presentation, it allows you to reuse logic components within several jsp pages.
if you decide to change the presentation layer in the future (to support wap, for example) you don't need to rewrite your entire application, since the "guts" of the application is outside of the jsps.
it is also a good idea to separate your business logic from your data layer. adding a "buffer zone" between these layers helps in the same manner as in separating presentation from logic. if you're using flat files for storage now, upgrading to a database wouldn't require rewriting all your business logic, just the methods which write out the data to a file, for example.
once you feel comfortable with separating the various layers, check out the struts framework at http://jakarta.apache.org/
to answer your second question, to get parameters passed in from HTML forms, use ServletRequet's getParameter() method.
in tomcat:
<% String lastName = request.getParameter( "lastname" ); %>
to answer your third question: when displaying the HTML from withing a jsp, print out the string to a javascript variable or a hidden form element:
<% String firstName = "mike"; %>
<input type="hidden" name="firstname" value="<%= firstName %>">
<script language="javascript1.2">
var firstName = "<%= firstName %>";
</script>
this jsp results in the following html:
<input type="hidden" name="firstname" value="mike">
<script language="javascript1.2">
var firstName = "mike";
</script> -
Problem with java beans and jsp on web logic 6.0 sp1
HI ,
I am using weblogic6.0 sp1.
i have problem with jsp and java beans.
i am using very simple java bean which stores name and email
from a html form.
but i am getting following errors:
Full compiler error(s):
D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
cannot resolve symbol
symbol : class userbn
location: class jsp_servlet._savename2
userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
^
D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
cannot resolve symbol
symbol : class userbn
location: class jsp_servlet._savename2
userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
^
D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:94:
cannot resolve symbol
symbol : class userbn
location: class jsp_servlet._savename2
ud = (userbn) java.beans.Beans.instantiate(getClass().getClassLoader(),
"userbn"); //[ /SaveName2.jsp; Line: 7]
^
3 errors
in which directory should i place java bean source file(.java file)
here is my jsp file:
<%@ page language = "java" contentType = "text/html" %>
<html>
<head>
<title>bean2</title>
</head>
<body>
<jsp:usebean id = "ud" class = "userbn" >
<jsp:setProperty name = "ud" property = "*" />
</jsp:usebean>
<ul>
<li> name: <jsp:getProperty name = "ud" property = "name" />
<li> email : <jsp:getProperty name = "ud" property = "email" />
</ul>
</body>
<html>
here is my bean :
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
import java.io.*;
public class userbn implements Serializable
private String name ;
private String email;
public void setName(String n)
name = n;
public void setEmail(String e)
email = e;
public String getName()
return name;
public String getEmail()
return email;
public userbn(){}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pls help me.
Thanks
sravana.
You realy can do it like Xiang says, but the better way is to use packages. That's
the way BEA is designed for. If you use packages you can but your bean classes
in every subfolder beneath Classes. Here for example we have the subfolders test
and beans:
You have to declare the package on top of your Bean Source Code:
package test.beans;
In your JSP you don't need the import code of Xiang. You only have to refer the
path of your bean class:
<jsp:useBean id="testBean" scope="session" class="test.beans.TestBean" />
There are some other AppServers that only can deploy Java Beans in packages. So
if you use packages you are always on the right side.
ciao bernd
"sravana" <[email protected]> wrote:
>
>Thank you very much Xiang Rao, It worked fine.
>Thanks again
>sravana.
>
>"Xiang Rao" <[email protected]> wrote:
>>
>><%@ page import="userbn" language = "java" contentType = "text/html"
>>%> should
>>work for you.
>>
>>
>>"sravana" <[email protected]> wrote:
>>>
>>>HI ,
>>>
>>>I am using weblogic6.0 sp1.
>>>
>>>i have problem with jsp and java beans.
>>>
>>>i am using very simple java bean which stores name and email
>>>
>>>from a html form.
>>>
>>>but i am getting following errors:
>>>
>>>________________________________________________________________
>>>
>>>Full compiler error(s):
>>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
>>>cannot resolve symbol
>>>symbol : class userbn
>>>location: class jsp_servlet._savename2
>>> userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
>>> ^
>>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
>>>cannot resolve symbol
>>>symbol : class userbn
>>>location: class jsp_servlet._savename2
>>> userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
>>> ^
>>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:94:
>>>cannot resolve symbol
>>>symbol : class userbn
>>>location: class jsp_servlet._savename2
>>> ud = (userbn) java.beans.Beans.instantiate(getClass().getClassLoader(),
>>>"userbn"); //[ /SaveName2.jsp; Line: 7]
>>> ^
>>>3 errors
>>>
>>>____________________________________________________________
>>>
>>>in which directory should i place java bean source file(.java file)
>>>
>>>here is my jsp file:
>>>--------------------------------------------------------
>>>
>>><%@ page language = "java" contentType = "text/html" %>
>>><html>
>>><head>
>>><title>bean2</title>
>>></head>
>>><body>
>>><jsp:usebean id = "ud" class = "userbn" >
>>><jsp:setProperty name = "ud" property = "*" />
>>></jsp:usebean>
>>><ul>
>>><li> name: <jsp:getProperty name = "ud" property = "name" />
>>><li> email : <jsp:getProperty name = "ud" property = "email" />
>>></ul>
>>></body>
>>><html>
>>>
>>>-------------------------------------------------------------
>>>
>>>here is my bean :
>>>
>>>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>>import java.io.*;
>>>
>>>public class userbn implements Serializable
>>>{
>>>
>>> private String name ;
>>>
>>> private String email;
>>>
>>> public void setName(String n)
>>> {
>>>
>>> name = n;
>>> }
>>>
>>> public void setEmail(String e)
>>> {
>>>
>>> email = e;
>>> }
>>>
>>> public String getName()
>>> {
>>>
>>> return name;
>>> }
>>>
>>> public String getEmail()
>>> {
>>>
>>> return email;
>>> }
>>>
>>> public userbn(){}
>>>}
>>>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>>pls help me.
>>>Thanks
>>>sravana.
>>>
>>
>
-
Test web service proxy using EJB session bean client...
Hello!
I am following this blog /people/abdelmorhit.elrhazi/blog/2009/10/30/how-to-consume-an-inbound-backend-web-service-in-nwdsjboss-environment to create a EJB session bean client to access the web service proxy...
The blog is not very clear. Where should I be deploying the web service proxy and the EJB session bean (web service client) ? on the PI 7.1 ?
How to find out the URL for the wsdl ?
Thanks> The blog is not very clear. Where should I be deploying the web service proxy and the EJB session bean (web service client) ? on the PI 7.1 ?
"To deploy your web service proxy and session bean, right click on your JBoss server in the Servers view, and click on Add Remove Projects, add you ear file and click finish."
You need a JBoss server. -
HOWTO: Using a BC4J Application Module in an Stateless EJB Session Bean
HOWTO: Using a BC4J Application Module in an Stateless EJB Session Bean
by Steve Muench
Overview
BC4J provides automatic facilities for deploying any application module as a stateful EJB session bean. If you want to leverage the features of your BC4J application module from a stateless EJB session bean, it's not automatic but it is straightforward to implement. This howto article explains the details.
For our example, we will create a stateless EJB session bean that uses a container-managed transaction. To keep things simple, let's assume the session bean has a single public method on its remote interface named createDepartment() with the following signature:
public void createDepartment(int id, String name, String loc) throws AppException
AppException is an example of an application-specific exception that our method will throw if any problems arise during its execution.The goal of this article is to illustrate how to use the BC4J application module named com.example.hr.HRApp as part of the implementation of this createDepartment method on our stateless enterprise bean. Let's assume that the HRApp application module has a view object member named Departments, based on the com.example.hr.DeptView view object, based on the familiar DEPT table and related to the com.example.hr.Dept entity object so our view can be updateable.
Creating the Stateless Session Bean
We can start by using the JDeveloper Enterprise Bean wizard to create a new stateless session bean called StatelessSampleEJB implemented by:[list][*]com.example.StatelessSampleEJBBean (Bean class)[*]com.example.StatelessSampleEJBHome (Home interface)[*]com.example.StatelessSampleEJB (Remote interface)[list]
We then use the EJB Class Editor to add the createDepartment method to the remote interface of StatelessSampleEJB with the signature above. We edit the remote interface to make sure that it also reflects that the createDepartment method thows the AppException like this:
package com.example;
import javax.ejb.EJBObject;
import java.rmi.RemoteException;
public interface StatelessSampleEJB extends EJBObject {
void createDepartment(int id, String name, String loc)
throws RemoteException,AppException;
}Before we start adding BC4J into the picture for our implementation, our StatelessSampleEJBBean class looks like this:
package com.example;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class StatelessSampleEJBBean implements SessionBean {
public void ejbCreate(){}
public void ejbActivate(){}
public void ejbPassivate(){}
public void ejbRemove(){}
public void setSessionContext(SessionContext ctx){
public void createDepartment(int id, String name, String loc)
throws AppException {
// TODO: Implement method here
}We can double-click on the ejb-jar.xml file in our project to see the XML deployment descriptor for the bean we just created:
<ejb-jar>
<enterprise-beans>
<session>
<description>Session Bean ( Stateless )</description>
<display-name>StatelessSampleEJB</display-name>
<ejb-name>StatelessSampleEJB</ejb-name>
<home>com.example.StatelessSampleEJBHome</home>
<remote>com.example.StatelessSampleEJB</remote>
<ejb-class>com.example.StatelessSampleEJBBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
</ejb-jar>We need to add the extra <assembly-descriptor> section in this file to indicate that the createDepartment method will require a transaction. After this edit, the ejb-jar.xml file looks like this:
<ejb-jar>
<enterprise-beans>
<session>
<description>Session Bean ( Stateless )</description>
<display-name>StatelessSampleEJB</display-name>
<ejb-name>StatelessSampleEJB</ejb-name>
<home>com.example.StatelessSampleEJBHome</home>
<remote>com.example.StatelessSampleEJB</remote>
<ejb-class>com.example.StatelessSampleEJBBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>StatelessSampleEJB</ejb-name>
<method-name>createDepartment</method-name>
<method-params>
<method-param>int</method-param>
<method-param>java.lang.String</method-param>
<method-param>java.lang.String</method-param>
</method-params>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
Aggregating a BC4J Application Module
With the EJB aspects of our bean setup, we can proceed to implementing the BC4J application module aggregation.
The first thing we do is add private variables to hold the EJB SessionContext and the instance of the aggregated BC4J ApplicationModule, like this:
// Place to hold onto the aggregated appmodule instance
transient private ApplicationModule _am = null;
// Remember the SessionContext that the EJB container provides us
private SessionContext _ctx = null;and we modify the default, empty implementation of the setSessionContext() method to remember the session context like this:
public void setSessionContext(SessionContext ctx){ _ctx = ctx; }We add additional constants that hold the names of the J2EE datasource that we want BC4J to use, as well as the fully-qualified name of the BC4J application module that we'll be aggregating:
// JNDI resource name for the J2EE datasource to use
private static final String DATASOURCE = "jdbc/OracleCoreDS";
// Fully-qualified BC4J application module name to aggregate
private static final String APPMODNAME = "com.example.hr.HRApp";We expand the now-empty ejbCreate() and ejbRemove() methods to create and destory the aggregated instance of the BC4J application module that we'll use for the lifetime of the stateless session bean. When we're done, ejbCreate() it looks like this:
public void ejbCreate() throws CreateException {
try {
// Setup a hashtable of environment parameters for JNDI initial context
Hashtable env = new Hashtable();
env.put(JboContext.INITIAL_CONTEXT_FACTORY,JboContext.JBO_CONTEXT_FACTORY);
// NOTE: we want to use the BC4J app module in local mode as a simple Java class!
env.put(JboContext.DEPLOY_PLATFORM, JboContext.PLATFORM_LOCAL);
env.put(PropertyConstants.INTERNAL_CONNECTION_PARAMS,DATASOURCE);
// Create an initial context, using this hashtable of environment params
InitialContext ic = new InitialContext(env);
// Lookup a home interface for the application module
ApplicationModuleHome home = (ApplicationModuleHome)ic.lookup(APPMODNAME);
// Using the home, create the instance of the appmodule we'll use
_am = home.create();
// Register the BC4J factory to handle EJB container-managed transactions
registerContainerManagedTransactionHandlerFactory();
catch(Exception ex) {
ex.printStackTrace();
throw new CreateException(ex.getMessage());
}and ejbRemove() looks like this:
public void ejbRemove() {
try {
// Cleanup any appmodule resources before getting shutdown
_am.remove();
catch(JboException ex) { /* Ignore */ }
}The helper method named reigsterContainerManagedTransactionHandlerFactory() looks like this:
private void registerContainerManagedTransactionHandlerFactory() {
SessionImpl session = (SessionImpl)_am.getSession();
session.setTransactionHandlerFactory(
new TransactionHandlerFactory() {
public TransactionHandler createTransactionHandler() {
return new ContainerManagedTxnHandlerImpl();
public JTATransactionHandler createJTATransactionHandler() {
return new ContainerManagedTxnHandlerImpl();
}The last detail is to use the BC4J appmodule to implement the createDepartment() method. It ends up looking like this:
public void createDepartment(int id, String name, String loc)
throws AppException {
try {
// Connect the AM to the datasource we want to use for the duration
// of this single method call.
_am.getTransaction().connectToDataSource(null,DATASOURCE,false);
// Use the "Departments" view object member of this AM
ViewObject departments = _am.findViewObject("Departments");
// Create a new row in this view object.
Row newDept = departments.createRow();
// Populate the attributes from the parameter arguments.
newDept.setAttribute("Deptno", new Number(id));
newDept.setAttribute("Dname", name);
newDept.setAttribute("Loc", loc);
// Add the new row to the view object's default rowset
departments.insertRow(newDept);
// Post all changes in the AM, but we don't commit them. The EJB
// container managed transaction handles the commit.
_am.getTransaction().postChanges();
catch(JboException ex) {
// To be good EJB Container-Managed Transaction "citizens" we have
// to mark the transaction as needing a rollback if there are problems
_ctx.setRollbackOnly();
throw new AppException("Error creating dept "+ id +"\n"+ex.getMessage());
finally {
try {
// Disconnect the AM from the datasource we're using
_am.getTransaction().disconnect();
catch(Exception ex) { /* Ignore */ }
Building a Test Client
With the EJB-Tier work done, we can build a sample client program to test this new stateless EJB Session Bean by selecting the bean in the Oracle9i JDeveloper IDE and choosing "Create Sample Java Client" from the right-mouse menu.
When the "Sample EJB Client Details" dialog appears, we take the defaults of connecting to embedded OC4J container. Clicking the (OK) button generates the following test class:
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
import com.example.StatelessSampleEJB;
import com.example.StatelessSampleEJBHome;
public class SampleStatelessSampleEJBClient {
public static void main(String [] args) {
SampleStatelessSampleEJBClient sampleStatelessSampleEJBClient =
new SampleStatelessSampleEJBClient();
try {
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.evermind.server.rmi.RMIInitialContextFactory");
env.put(Context.SECURITY_PRINCIPAL, "admin");
env.put(Context.SECURITY_CREDENTIALS, "welcome");
env.put(Context.PROVIDER_URL,
"ormi://localhost:23891/current-workspace-app");
Context ctx = new InitialContext(env);
StatelessSampleEJBHome statelessSampleEJBHome =
(StatelessSampleEJBHome)ctx.lookup("StatelessSampleEJB");
StatelessSampleEJB statelessSampleEJB;
// Use one of the create() methods below to create a new instance
// statelessSampleEJB = statelessSampleEJBHome.create();
// Call any of the Remote methods below to access the EJB
// statelessSampleEJB.createDepartment( int id, java.lang.String name, java.lang.String loc );
catch(Throwable ex) {
ex.printStackTrace();
}We uncomment the call to the create() method and add a few calls to the createDepartment() method so that the body of the test program now looks like this:
// Use one of the create() methods below to create a new instance
statelessSampleEJB = statelessSampleEJBHome.create();
// Call any of the Remote methods below to access the EJB
statelessSampleEJB.createDepartment( 13, "Test1","Loc1");
System.out.println("Created department 13");
statelessSampleEJB.createDepartment( 14, "Test2","Loc2");
System.out.println("Created department 14");
try {
// Try setting a department id that is too large!
statelessSampleEJB.createDepartment( 23456, "Test3","Loc3");
catch (AppException ax) {
System.err.println("AppException: "+ax.getMessage());
}Before we can successfully run our SampleStatelessSampleEJBClient we need to first run the EJB bean that the client will try to connect to. Since Oracle9i JDeveloper supports local running and debugging of the EJB-Tier without doing through a full J2EE deployment step, to accomplish this prerequisite step we just need to right-mouse on the StatelessSampleEJB node in the System Navigator and select "Run". This starts up the embedded OC4J instance and runs the EJB right out of the current out path.Finally, we can run the SampleStatelessSampleEJBClient, and see the output of the test program in the JDeveloper log window:
Created department 13
Created department 14
AppException: Error creating dept 23456
JBO-27010: Attribute set with value 23456 for Deptno in Dept has invalid precision/scale
Troubleshooting
One error that might arise while running the example is that the database connection information in your data-sources.xml for the jdbc/OracleCoreDS datasource does not correspond to the database you are trying to test against. If this happens, then double-check the file .\jdev\system\oc4j-config\data-sources.xml under the JDeveloper installation home directory to make sure that the url value provided is what you expect. For example, to work against a local Oracle database running on your current machine, listening on port 1521, with SID of ORCL, you would edit this file to have an entry like this for jdbc/OracleCoreDS :
<data-source
class="com.evermind.sql.DriverManagerDataSource"
name="OracleDS"
location="jdbc/OracleCoreDS"
xa-location="jdbc/xa/OracleXADS"
ejb-location="jdbc/OracleDS"
connection-driver="oracle.jdbc.driver.OracleDriver"
username="scott"
password="tiger"
url="jdbc:oracle:thin:@localhost:1521:ORCL"
inactivity-timeout="30"
/>This is the data-sources.xml file that gets used by the embedded OC4J instance running in JDeveloper.
Conclusion
Hopefully this article has illustrated that it is straightforward to utilize the full power of BC4J in local mode as part of your EJB Stateless Session Beans using container-managed transaction. This example illustrated a single createDepartment method in the enterprise bean, but by replicating the application module interaction code that we've illustrated in createDepartment, any number of methods in your stateless session bean can use the aggregated application module instance created in the ejbCreate() method.
Code Listing
The full code listing for the SampleStatelessEJB bean implementation class looks like this:
* StatelessSampleEJB
* Illustrates how to use an aggregated BC4J application module
* in local mode as part of the implementation of a stateless
* EJB session bean using container-managed transaction.
* HISTORY
* smuench/dmutreja 14-FEB-2002 Created
package com.example;
import oracle.jbo.*;
import oracle.jbo.server.*;
import javax.ejb.*;
import oracle.jbo.domain.Number;
import oracle.jbo.common.PropertyConstants;
import java.util.Hashtable;
import javax.naming.InitialContext;
import oracle.jbo.server.ejb.ContainerManagedTxnHandlerImpl;
public class StatelessSampleEJBBean implements SessionBean {
// JNDI resource name for the J2EE datasource to use
private static final String DATASOURCE = "jdbc/OracleCoreDS";
// Fully-qualified BC4J application module name to aggregate
private static final String APPMODNAME = "com.example.hr.HRApp";
// Place to hold onto the aggregated appmodule instance
transient private ApplicationModule _am = null;
// Remember the SessionContext that the EJB container provides us
private SessionContext _ctx = null;
public void ejbCreate() throws CreateException {
try {
// Setup a hashtable of environment parameters for JNDI initial context
Hashtable env = new Hashtable();
env.put(JboContext.INITIAL_CONTEXT_FACTORY,JboContext.JBO_CONTEXT_FACTORY);
env.put(JboContext.DEPLOY_PLATFORM, JboContext.PLATFORM_LOCAL);
env.put(PropertyConstants.INTERNAL_CONNECTION_PARAMS,DATASOURCE);
// Create an initial context, using this hashtable of environment params
InitialContext ic = new InitialContext(env);
// Lookup a home interface for the application module
ApplicationModuleHome home = (ApplicationModuleHome)ic.lookup(APPMODNAME);
// Using the home, create the instance of the appmodule we'll use
_am = home.create();
// Register the BC4J factory to handle EJB container-managed transactions
registerContainerManagedTransactionHandlerFactory();
catch(Exception ex) {
ex.printStackTrace();
throw new CreateException(ex.getMessage());
public void ejbActivate(){}
public void ejbPassivate(){}
public void ejbRemove(){}
public void setSessionContext(SessionContext ctx){ _ctx = ctx; }
public void createDepartment(int id, String name, String loc)
throws AppException {
try {
// Connect the AM to the datasource we want to use for the duration
// of this single method call.
_am.getTransaction().connectToDataSource(null,DATASOURCE,false);
// Use the "Departments" view object member of this AM
ViewObject departments = _am.findViewObject("Departments");
// Create a new row in this view object.
Row newDept = departments.createRow();
// Populate the attributes from the parameter arguments.
newDept.setAttribute("Deptno", new Number(id));
newDept.setAttribute("Dname", name);
newDept.setAttribute("Loc", loc);
// Add the new row to the view object's default rowset
departments.insertRow(newDept);
// Post all changes in the AM, but we don't commit them. The EJB
// container managed transaction handles the commit.
_am.getTransaction().postChanges();
catch(JboException ex) {
// To be good EJB Container-Managed Transaction "citizens" we have
// to mark the transaction as needing a rollback if there are problems
_ctx.setRollbackOnly();
throw new AppException("Error creating dept "+ id +\n"+ex.getMessage());
finally {
try {
// Disconnect the AM from the datasource we're using
_am.getTransaction().disconnect();
catch(Exception ex) { /* Ignore */ }
private void registerContainerManagedTransactionHandlerFactory() {
SessionImpl session = (SessionImpl)_am.getSession();
session.setTransactionHandlerFactory(
new TransactionHandlerFactory() {
public TransactionHandler createTransactionHandler() {
return new ContainerManagedTxnHandlerImpl();
public JTATransactionHandler createJTATransactionHandler() {
return new ContainerManagedTxnHandlerImpl();Hi Steve, It4s me again;
About the question I made, I tried with a single assembly-descriptor tag and a single container-transaction tag in the deployment descriptor of the session bean and these were the results.
java.lang.NullPointerException
void com.evermind.server.rmi.RMIConnection.EXCEPTION_ORIGINATES_FROM_THE_REMOTE_SERVER(java.lang.Throwable)
java.lang.Object com.evermind.server.rmi.RMIConnection.invokeMethod(com.evermind.server.rmi.RMIContext, long, long, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.rmi.RemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.rmi.RecoverableRemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.ejb.StatelessSessionRemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
void __Proxy1.modificaEnvoltura(java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.String)
void SamplemdeController.envolturaControlEJBClient.main(java.lang.String[])
Then I tried with multiple assembly-descriptor tags each with a single container-transaction tag and the results were:
java.lang.NullPointerException
void com.evermind.server.rmi.RMIConnection.EXCEPTION_ORIGINATES_FROM_THE_REMOTE_SERVER(java.lang.Throwable)
java.lang.Object com.evermind.server.rmi.RMIConnection.invokeMethod(com.evermind.server.rmi.RMIContext, long, long, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.rmi.RemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.rmi.RecoverableRemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.ejb.StatelessSessionRemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
void __Proxy1.modificaEnvoltura(java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.String)
void SamplemdeController.envolturaControlEJBClient.main(java.lang.String[])
Finally I tried with a single assembly-descriptor and multiple container tags and the results were:
java.lang.NullPointerException
void com.evermind.server.rmi.RMIConnection.EXCEPTION_ORIGINATES_FROM_THE_REMOTE_SERVER(java.lang.Throwable)
java.lang.Object com.evermind.server.rmi.RMIConnection.invokeMethod(com.evermind.server.rmi.RMIContext, long, long, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.rmi.RemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.rmi.RecoverableRemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
java.lang.Object com.evermind.server.ejb.StatelessSessionRemoteInvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
void __Proxy1.modificaEnvoltura(java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.Integer, java.lang.String)
void SamplemdeController.envolturaControlEJBClient.main(java.lang.String[])
How can I make my Stateless Session bean work out? -
Hi frnds i want to help in servlet,java bean and JSP
hi friends i'm right now in M.SC(IT) and i want to do project in SERVLET,,JAVA BEANS and JSP ,
so pls give me a title about that
NOTE: I develop a project in group(2 persons there)
my email id is : [email protected] , [email protected] , [email protected]You cannot pair your iPod to a cell phone, so forget about it.
The only way you can get free WiFi is to hang out at a Denny's, a Starbucks, or a truck stop, and I don't think your parents would approve.... -
How to debug a bean in JSP page with JBX???
How to debug a bean in JSP page with JBX???
i have a bean within a JSP page. i wanna find out how do they varibles work and changes of them values.
are there some ways or tools to get the situations of them in visual way? just like when i debug VB program,i can get the situations in immediately window.help me !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
How to delete a database record by using EJB entity beans
Hi, All,
Does anyone know how to use entity bean to delete a database record? I have all the EJB entity beans created, including access beans to each. I can successfully create records, find and update records, however, I haven't find a way to delete records yet.
Your response is appreciated.
CathyPlease see EJB Forums for continue discussion on this subject.
Reference titile: "how to delete database record by using CMP entity beans " -
hi,
i' m trainee developer and working in struts. i'm totally novice in this regard. my pl asked me to develop an application on struts. i'm getting problem while using bean through jsp. i'm writing code:
<jsp:useBean id="myBean" class="MyBean" type="MyBean" scope = "session"/>
the error is:
cannot resolve symbol
symbol : class MyBean
location: class org.apache.jsp.confirm_jsp
MyBean myBean = null;
^
total 3 errors associated with it. MyBean class is located in WEB-INF/classes
can any one help me out?put your bean in a package and put that package under the WEB-INF/classes directory. Then use the fully qualified class name for the jsp:useBean:
//in the bean
package net.thelukes.myprog.beans;
//the jsp:useBean
<jsp:useBean id="myBean" class="net.thelukes.myprog.beans.MyBean" scope="session"/> -
I have looked at BC4J and it looks good. Buy my question is that isn't this frame work in direct conflict with EJB entity beans. I know lot of stuff that is there in BC4J should have been in EJB enitiy beans, but as a developer why should I go with BC4J and not the standard EJB stuff considering the fact that BC4J is properietery to Oracle?Any thoughts?
Vimal,
Without going into exhaustive detail here, I would like to recommend that you take a look at the BC4J Technical White Paper available from the JDeveloper page on OTN (in the 3.0 Technical Information section):
http://technet.oracle.com/products/jdev/info/techwp20/wp.html
Amoung other things to note, BC4J is based on pure Java, and is what we consider a 'white box', meaning, you as a developer have complete control over what is going on. You can extend any of the code generated to customize it.
Primarily though, the major benefit of BC4J is that we have taken care of most of the complicated communication code for you. Communication between the client and the data server, transaction handling, row locking, etc are already written for you. You just use, extend, customize what we have provided.
In addition, BC4J allows you flexibility in your deployment environment decision. Regardless of where and how you deploy your BC4J Application Module, the client is unchanged.
Those are the key advantages. Again, for more details, I would take a look at the white paper to see if it more fully addresses your questions.
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