Adding Seam to an existing EJB2 application

[kummer]

I'm trying to add Seam to an old EJB2 application so that we can do new development in Seam and gradually port the old stuff into Seam.

I starting by merging the deployment directory of an "empty" Seam application, SeamApp, (created with seam-gen new-project) into the exploaded deployment legacy application, just to see if this was workable. There isn't really that much to copy across:

- the jars, including SeamApp.jar.
- module entries in META-INF/application.xml.
- security.drl - the jboss rules' security defintions.
- Seam-specific entries in web.xml
- other files in SeamApp.war

I left META-INF/jboss-app.xml intact. It already contains a <loader-repository> entry and cannot have two.

After this the old application worked fine and I could access home.seam.

Next I created a SFSB, DemoManager, using create-conversation in seam-gen and copied the diff of the deploy the same way to the deploeyd old app. This time (also after server restart) I get an exception when trying to access the new page:

18:14:16,421 ERROR [STDERR] 12.09.2007 18:14:16 com.sun.facelets.FaceletViewHandler handleRenderException
SCHWERWIEGEND: Error Rendering View[/demoManager.xhtml]
javax.el.ELException: /demoManager.xhtml: Exception getting value of property value of base of type : org.javassist.tmp.java.lang.Object_$$_javassist_0
 at com.sun.facelets.compiler.TextInstruction.write(TextInstruction.java:48)
 at com.sun.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:39)
 at org.ajax4jsf.framework.renderer.RendererBase.renderChild(RendererBase.java:280)
 at org.ajax4jsf.framework.renderer.RendererBase.renderChildren(RendererBase.java:262)
 at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:189)
 at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:184)
 at org.ajax4jsf.framework.renderer.RendererBase.encodeChildren(RendererBase.java:121)
 at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:524)
 at com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:244)
 at com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:249)
 at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:573)
 at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
 at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:229)
 at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:384)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:138)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63)
 at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:60)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
 at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
 at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
 at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
 at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:234)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at lu.deka.servlets.LoggedInFilter.doFilter(LoggedInFilter.java:56)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96)
 at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
 at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run(Thread.java:595)
Caused by: javax.faces.el.EvaluationException: Bean: org.javassist.tmp.java.lang.Object_$$_javassist_0, property: value
 at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl.java:442)
 at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:82)
 at com.sun.facelets.el.LegacyELContext$LegacyELResolver.getValue(LegacyELContext.java:141)
 at com.sun.el.parser.AstValue.getValue(AstValue.java:125)
 at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:195)
 at com.sun.facelets.el.ELText$ELTextVariable.writeText(ELText.java:184)
 at com.sun.facelets.compiler.TextInstruction.write(TextInstruction.java:45)
 ... 56 more
Caused by: java.lang.reflect.InvocationTargetException
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl.java:438)
 ... 62 more
Caused by: java.lang.IllegalArgumentException: Could not invoke method by reflection: DemoManager.getValue() on: $Proxy167
 at org.jboss.seam.util.Reflections.invoke(Reflections.java:30)
 at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
 at org.jboss.seam.intercept.ClientSideInterceptor$1.proceed(ClientSideInterceptor.java:72)
 at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:57)
 at org.jboss.seam.interceptors.RemoveInterceptor.aroundInvoke(RemoveInterceptor.java:40)
 at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
 at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:103)
 at org.jboss.seam.intercept.ClientSideInterceptor.invoke(ClientSideInterceptor.java:50)
 at org.javassist.tmp.java.lang.Object_$$_javassist_0.getValue(Object_$$_javassist_0.java)
 ... 67 more
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.seam.util.Reflections.invoke(Reflections.java:20)
 ... 75 more

Do you have any idea how to solve this or am I perhaps on the wrong track altogeather?

Cheers
Thor

[jacob.orshalick]

Posting the code for DemoManager and the Remote or Local interface would help. Did you add the method getValue() to the Local or Remote interface that DemoManager implements?

[kummer]

The demoManager is created using seam-gen's new-conversation target. The xhtml page (as generated) has buttons for beginning and ending a conversation and for incrementing a value, which is shown on the page. The bean has the corresponding methods. Again, this is the raw product from the new-conversation target. Here is the code for the interface, the bean and the XHTML:

DemoManager.java

package lu.deka.tukan.session;

import javax.ejb.Local;

@Local
public interface DemoManager {

 //seam-gen methods
 public String begin();
 public String increment();
 public String end();
 public int getValue();
 public void destroy();

 //add additional interface methods here
}

DemoManagerBean.java

package lu.deka.tukan.session;

import javax.ejb.Remove;
import javax.ejb.Stateful;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Begin;
import org.jboss.seam.annotations.End;
import org.jboss.seam.annotations.Destroy;
import org.jboss.seam.annotations.Logger;
import org.jboss.seam.log.Log;

@Stateful
@Name("DemoManager")
public class DemoManagerBean implements DemoManager {

 @Logger private Log log;

 private int value;

 @Begin
 public String begin()
 {
 //implement your begin conversation business logic
 log.info("beginning conversation");
 return "success";
 }

 public String increment()
 {
 log.info("incrementing");
 value++;
 return "success";
 }

 //add additional action methods that participate in this conversation

 @End
 public String end()
 {
 //implement your end conversation business logic
 log.info("ending conversation");
 return "home";
 }

 public int getValue()
 {
 return value;
 }

 @Destroy @Remove
 public void destroy() {}
}

demoManager.xhtml

<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
 xmlns:s="http://jboss.com/products/seam/taglib"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:f="http://java.sun.com/jsf"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:rich="http://richfaces.ajax4jsf.org/rich"
 template="layout/template.xhtml">

<ui:define name="body">

 <h:messages globalOnly="true" styleClass="message"/>

 <rich:panel>
 <f:facet name="header">demoManager</f:facet>

 <div class="dialog">
 <div class="prop">
 <span class="name">Value</span>
 <span class="value">#{DemoManager.value}</span>
 </div>
 </div>

 </rich:panel>

 <h:form id="DemoManager">
 <div class="actionButtons">
 <h:commandButton id="begin" value="Begin"
 action="#{DemoManager.begin}"/>
 <h:commandButton id="inc" value="Increment"
 action="#{DemoManager.increment}"/>
 <h:commandButton id="end" value="End"
 action="#{DemoManager.end}"/>
 </div>
 </h:form>

</ui:define>

</ui:composition>

[kummer]

Solved
The missing piece was changing the JNDI name pattern in components.xml to reflect the name of the old application (tukan).

<core:init debug="true" jndi-pattern="tukan/#{ejbName}/local"/>

Thanks for listening ;-).