- Conversation problem: how to null variable?

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- Conversation problem: how to null variable?

- Conversation problem: how to null variable?

2007-07-10 - By miloslav.vlach

Back
Hi all,

I have 2 same entities in the seam component:

| @(protected)(required=false, scope=ScopeType.CONVERSATION)
| @(protected)(required=false, scope=ScopeType.CONVERSATION)
| Category selectedCategory;
|
| @(protected)(required=false)
| Category category;
|

I get exception:

| javax.faces.el.PropertyNotFoundException

Source code of javax.faces.el.PropertyNotFoundException

: Base is null: selectedCategory
| at org.apache.myfaces.el.ValueBindingImpl

Source code of org.apache.myfaces.el.ValueBindingImpl

(ValueBindingImpl.java:460)
| at org.apache.myfaces.el.ValueBindingImpl

(ValueBindingImpl
.java:248)
| at org.jboss.seam.core.Expressions$1.setValue(Expressions.java:93)
| at org.jboss.seam.core.Pages.applyViewRootValues(Pages.java:665)
| at org.jboss.seam.jsf.AbstractSeamPhaseListener.afterRestoreView
(AbstractSeamPhaseListener.java:77)
| at org.jboss.seam.jsf.SeamPhaseListener.afterPhase
(SeamPhaseListener.java:95)
| at org.apache.myfaces.lifecycle.PhaseListenerManager
.informPhaseListenersAfter(PhaseListenerManager.java:89)
| at org.apache.myfaces.lifecycle.LifecycleImpl

Source code of org.apache.myfaces.lifecycle.LifecycleImpl

(LifecycleImpl.java:181)
| at org.apache.myfaces.lifecycle.LifecycleImpl

(LifecycleImpl
.java:66)
| at javax.faces.webapp.FacesServlet

Source code of javax.faces.webapp.FacesServlet

(FacesServlet.java:137)
| at org.apache.catalina.core.ApplicationFilterChain

Source code of org.apache.catalina.core.ApplicationFilterChain

(ApplicationFilterChain.java:269)
| at org.apache.catalina.core.ApplicationFilterChain

(ApplicationFilterChain.java:188)
| at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter
(ExtensionsFilter.java:144)
| at org.apache.catalina.core.ApplicationFilterChain

(ApplicationFilterChain.java:215)
| at org.apache.catalina.core.ApplicationFilterChain

(ApplicationFilterChain.java:188)
| 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.SeamFilter$FilterChainImpl.doFilter
(SeamFilter.java:53)
| at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java
:79)
| at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter
(SeamFilter.java:49)
| at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84)
| at org.apache.catalina.core.ApplicationFilterChain

(ApplicationFilterChain.java:215)
| at org.apache.catalina.core.ApplicationFilterChain

(ApplicationFilterChain.java:188)
| 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

(ApplicationFilterChain.java:215)
| at org.apache.catalina.core.ApplicationFilterChain

(ApplicationFilterChain.java:188)
| at org.apache.catalina.core.StandardWrapperValve

Source code of org.apache.catalina.core.StandardWrapperValve

(StandardWrapperValve.java:210)
| at org.apache.catalina.core.StandardContextValve

Source code of org.apache.catalina.core.StandardContextValve

(StandardContextValve.java:174)
| at org.apache.catalina.authenticator.AuthenticatorBase

Source code of org.apache.catalina.authenticator.AuthenticatorBase

(AuthenticatorBase.java:433)
| at org.apache.catalina.core.StandardHostValve

Source code of org.apache.catalina.core.StandardHostValve

(StandardHostValve.java:127)
| at org.apache.catalina.valves.ErrorReportValve

Source code of org.apache.catalina.valves.ErrorReportValve

(ErrorReportValve.java:117)
| at org.apache.catalina.core.StandardEngineValve

Source code of org.apache.catalina.core.StandardEngineValve

(StandardEngineValve.java:108)
| at org.apache.catalina.connector.CoyoteAdapter

Source code of org.apache.catalina.connector.CoyoteAdapter

(CoyoteAdapter.java:151)
| at org.apache.coyote.http11.Http11Processor

Source code of org.apache.coyote.http11.Http11Processor

(Http11Processor
.java:870)
| at org.apache.coyote.http11.Http11BaseProtocol

Source code of org.apache.coyote.http11.Http11BaseProtocol

$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
| at org.apache.tomcat.util.net.PoolTcpEndpoint

Source code of org.apache.tomcat.util.net.PoolTcpEndpoint

(PoolTcpEndpoint.java:528)
| at org.apache.tomcat.util.net.LeaderFollowerWorkerThread

Source code of org.apache.tomcat.util.net.LeaderFollowerWorkerThread

(LeaderFollowerWorkerThread.java:81)
| at org.apache.tomcat.util.threads.ThreadPool

Source code of org.apache.tomcat.util.threads.ThreadPool

$ControlRunnable.run
(ThreadPool.java:685)
| at java.lang.Thread

(Thread.java:595)
|

I don't know, where is the problem.

After saving the category entity I need to clean the category form, but the
category (isn't marked with @(protected)) still appears on the form. I tried to set
category = null, but not succesfull.

Know somebody where is the problem ?

Thanks Mila

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&p=4062587#4062587

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=reply&p=4062587
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