3 Replies Latest reply on Jan 24, 2008 10:43 AM by pmuir

Target Unreachable, identifier 'expre' resolved to null

jeilong Aug 6, 2007 10:52 AM

I'm tearing my hair out over this simple thing I'd like to do: a conversation spanning two pages. Basically I have a table in which the user can click "edit" on a certain row. This will redirect the user to an edit page and the edit page gets populated with the selected item. So far so good. Upon clicking either save or cancel in the edit page the exception below comes up. It seems that the "supplierX" entity is nulled upon clicking either save or cancel. Am I missing some obvious logic or is this a configuration issue? We deployed this on JBoss 4.2.0.GA.

The stack trace:

javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:63)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Thread.java:595)

Caused by javax.el.PropertyNotFoundException with message: "/stemtables/supplier/edit_supplier.xhtml @30,59 value="#{suppplierX.phone}": Target Unreachable, identifier 'suppplierX' resolved to null"

com.sun.facelets.el.TagValueExpression.getType(TagValueExpression.java:62)
com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:81)
javax.faces.component.UIInput.getConvertedValue(UIInput.java:934)
javax.faces.component.UIInput.validate(UIInput.java:860)
javax.faces.component.UIInput.executeValidate(UIInput.java:1065)
javax.faces.component.UIInput.processValidators(UIInput.java:666)
javax.faces.component.UIForm.processValidators(UIForm.java:229)
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1030)
javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:662)
com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:100)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:63)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Thread.java:595)

The SFSB:

@Stateful
@Name("supplierMaintenance")
@Scope(ScopeType.CONVERSATION)
public class SupplierMaintenanceAction implements SupplierMaintenance {

 @PersistenceContext(type = PersistenceContextType.EXTENDED)
 private EntityManager entityManager;

 @EJB
 private SupplierFacadeLocal supplierFacade;

 @DataModel
 private List<Supplier> suppliers;

 @DataModelSelection
 @Out(value = "supplierX", required = false) // works
 @In(value = "supplierX", required = false) // doesn't work! why?
 private Supplier selectedSupplier;

 @Logger
 private Log log;

 @Begin
 @Factory("suppliers")
 public void findSuppliers() {
 log.debug("Entering findSuppliers.");
 try {
 suppliers = supplierFacade.findAllSuppliers();
 } catch (Exception e) {
 log.error("Failed to find suppliers.", e);
 }
 log.debug("Leaving findSupplier.");
 }

 public String edit() {
 return null;
 }

 @End
 public String delete() {
 Supplier toDelete = entityManager.merge(selectedSupplier);
 entityManager.remove(toDelete);
 findSuppliers();
 return null;
 }

 @End
 public String save() {
 Supplier toStore = entityManager.merge(selectedSupplier);
 entityManager.persist(toStore);
 findSuppliers();
 return null;
 }

 @End
 public String cancel() {
 return null;
 }

 @Remove // remove method is mandated by EJB3 specification for stateful session beans
 public void remove() {}

 @Destroy // destroy method is mandated by EJB3 specification for stateful session beans
 public void destroy() {}
}

pages.xml

<pages
 xmlns="http://jboss.com/products/seam/pages"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://jboss.com/products/seam/pages http://jboss.com/products/seam/pages-2.0.xsd"
 no-conversation-view-id="/login.xhtml" login-view-id="/login.xhtml">

 <page view-id="*">
 <navigation from-action="#{identity.logout}">
 <redirect view-id="/login.xhtml" />
 </navigation>
 </page>

 <page view-id="/login.xhtml">
 <navigation>
 <rule if="#{identity.loggedIn}">
 <redirect view-id="/welcome.xhtml" />
 </rule>
 </navigation>
 </page>

 <page view-id="/welcome.xhtml" login-required="true"></page>

 <!-- SUPPLIER MAINTAINCE -->
 <page view-id="/stemtables/supplier/supplier.xhtml" login-required="true">
 <navigation from-action="#{supplierMaintenance.delete}">
 <redirect view-id="/stemtables/supplier/supplier.xhtml" />
 </navigation>
 </page>

 <page view-id="/stemtables/supplier/supplier.xhtml" login-required="true">
 <navigation from-action="#{supplierMaintenance.edit}">
 <redirect view-id="/stemtables/supplier/edit_supplier.xhtml" />
 </navigation>
 </page>

 <page view-id="/stemtables/supplier/edit_supplier.xhtml" login-required="true">
 <navigation from-action="#{supplierMaintenance.save}">
 <redirect view-id="/stemtables/supplier/supplier.xhtml" />
 </navigation>
 </page>

 <page view-id="/stemtables/supplier/edit_supplier.xhtml" login-required="true">
 <navigation from-action="#{supplierMaintenance.cancel}">
 <redirect view-id="/stemtables/supplier/supplier.xhtml" />
 </navigation>
 </page>

 <!-- EXCEPTION HANDLING -->
 <exception class="org.jboss.seam.security.NotLoggedInException">
 <redirect view-id="/login.xhtml">
 <message severity="warn">You must be logged in to use this feature.</message>
 </redirect>
 </exception>
</pages>

web.xml

<web-app version="2.5"
 metadata-complete="true"
 xmlns="http://java.sun.com/xml/ns/javaee"
 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">

 <!-- Seam configuration -->
 <listener>
<listener-class>org.jboss.seam.servlet.SeamListener</listener-class>
 </listener>

 <!-- Propagate conversations across redirects -->
 <filter>
 <filter-name>Seam Redirect Filter</filter-name>
 <filter-class>org.jboss.seam.servlet.SeamRedirectFilter</filter-class>
 </filter>

 <filter-mapping>
 <filter-name>Seam Redirect Filter</filter-name>
 <url-pattern>*.seam</url-pattern>
 </filter-mapping>

 <servlet>
 <servlet-name>Seam Resource Servlet</servlet-name>
 <servlet-class>org.jboss.seam.servlet.ResourceServlet</servlet-class>
 </servlet>

 <servlet-mapping>
 <servlet-name>Seam Resource Servlet</servlet-name>
 <url-pattern>/seam/resource/*</url-pattern>
 </servlet-mapping>

 <filter>
 <filter-name>Seam Filter</filter-name>
 <filter-class>org.jboss.seam.web.SeamFilter</filter-class>
 </filter>

 <filter-mapping>
 <filter-name>Seam Filter</filter-name>
 <url-pattern>/*</url-pattern>
 </filter-mapping>

 <!-- JSF -->
 <context-param>
 <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
 <param-value>client</param-value>
 </context-param>

 <context-param>
 <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
 <param-value>.xhtml</param-value>
 </context-param>

 <context-param>
 <param-name>facelets.DEVELOPMENT</param-name>
 <param-value>true</param-value>
 </context-param>

 <servlet>
 <servlet-name>Faces Servlet</servlet-name>
 <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
 <load-on-startup>1</load-on-startup>
 </servlet>

 <servlet-mapping>
 <servlet-name>Faces Servlet</servlet-name>
 <url-pattern>*.seam</url-pattern>
 </servlet-mapping>

 <!-- JSF RI -->
 <listener>
 <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
 </listener>

 <session-config>
 <session-timeout>10</session-timeout>
 </session-config>
</web-app>

/stemtables/supplier/supplier.xhtml

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:s="http://jboss.com/products/seam/taglib"
 xmlns:a="https://ajax4jsf.dev.java.net/ajax"
 template="../../template.xhtml">

 <!-- content -->
 <ui:define name="content">
 <div class="section">
 <h:form>

 <h:dataTable value="#{suppliers}" var="supplier">
 <h:column>#{supplier.supplierName}</h:column>
 <h:column>#{supplier.address}</h:column>
 <h:column>#{supplier.phone}</h:column>
 <h:column>#{supplier.URL}</h:column>
 <h:column>
 <h:commandButton value="Edit" action="#{supplierMaintenance.edit}" />
 </h:column>
 <h:column>
 <h:commandButton value="Delete" action="#{supplierMaintenance.delete}" />
 </h:column>
 </h:dataTable>

 <span class="errors">
 <h:messages globalOnly="true"/>
 </span>

 </h:form>
 </div>
 </ui:define>

 <!-- sidebar -->
 <ui:define name="sidebar">
 <h1>SIDEBAR SECTION</h1>
 </ui:define>
</ui:composition>

/stemtables/supplier/edit_supplier.xhtml

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:s="http://jboss.com/products/seam/taglib"
 template="../../template.xhtml">

 <!-- content -->
 <ui:define name="content">
 <div class="section">
 <h:form>
 <fieldset>
 <div>
 <h:outputLabel for="supplierName">Name: </h:outputLabel>
 <h:inputText id="username" value="#{supplierX.supplierName}" required="true">
 <s:validate />
 </h:inputText>
 <div class="errors"><h:message for="supplierName" /></div>
 </div>
 <div>
 <h:outputLabel for="address">Address: </h:outputLabel>
 <h:inputText id="address" value="#{supplierX.address}">
 <s:validate />
 </h:inputText>
 <div class="errors"><h:message for="address" /></div>
 </div>
 <div>
 <h:outputLabel for="phone">Phone: </h:outputLabel>
 <h:inputText id="phone" value="#{suppplierX.phone}">
 <s:validate />
 </h:inputText>
 <div class="errors"><h:message for="phone" /></div>
 </div>
 <div>
 <h:outputLabel for="URL">URL: </h:outputLabel>
 <h:inputText id="URL" value="#{supplierX.URL}">
 <s:validate />
 </h:inputText>
 <div class="errors"><h:message for="URL" /></div>
 </div>
 <div class="errors"><h:messages globalOnly="true" /></div>
 <div class="buttonBox">
 <h:commandButton action="#{supplierMaintenance.save}" value="Save">
 <s:conversationPropagation type="join" />
 </h:commandButton>
 </div>
 <div class="buttonBox"><h:commandButton action="#{supplierMaintenance.cancel}" value="Cancel" /></div>
 </fieldset>
 </h:form>

 <span class="errors">
 <h:messages globalOnly="true" />
 </span>
 </div>
 </ui:define>

 <!-- sidebar -->
 <ui:define name="sidebar">
 <h1>SIDEBAR SECTION</h1>
 </ui:define>
</ui:composition>

EAR structure:

EAR:
+ jboss-seam-2.0.0.beta1.jar
+ jboss-el-seam-2.0.0.beta1.jar
+ ejb.jar
+ web.war

web.war:
WEB-INF/components.xml
WEB-INF/faces-config.xml
WEB-INF/pages.xml
WEB-INF/web.xml
WEB-INF/libjboss-seam-ui-2.0.0.beta1.jar
WEB-INF/lib/jboss-seam-debug-2.0.0.beta1.jar
WEB-INF/lib/jsf-facelets-1.1.13.jar

1. Re: Target Unreachable, identifier 'expre' resolved to null

rodosa Jan 22, 2008 3:51 AM (in response to jeilong)

Hello!

I've a problem similar that yours!! How had you solucinate it??

Thanks
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2. Re: Target Unreachable, identifier 'expre' resolved to null

ristretto Jan 22, 2008 3:17 PM (in response to jeilong)
Indeed, I'm in the same boat. Hopefully we'll get an explanation here.

In the orignial posting, I saw in supplier.xhtml

<h:commandButton action="#{supplierMaintenance.save}" value="Save"> <s:conversationPropagation type="join" /> </h:commandButton>

Looks like desperation, I don't think you should have to do the "join" there. You might have to put the conversation id there? But, I think that's only for links.

In any case, sorry, I don't have an answer for you. I'm in the same situation. I'm finding it quite frustrating that I have to waste time figuring out how to submit data in Seam/JSF....
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3. Re: Target Unreachable, identifier 'expre' resolved to null

pmuir Jan 24, 2008 10:43 AM (in response to jeilong)

Post YOUR problem.
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