A very nice summary of the topic!
Why don't you integrate this summary somewhere on the WIKI - where it fits?
We need more commentary like this on the WIKI!
regards,
Martin
On 9/30/05, Mike Kienenberger <[EMAIL PROTECTED]> wrote:
> I kept hoping someone else would jump in with an answer to this as
> what I'm about to tell you is likely wrong in some aspects due to my
> own lack of understanding.
>
> StateManager does keep state, but you as an end-user have to give it
> hints about what state needs to be kept. That's either via
> implementing Serializable (and correct use of transient is part of
> that) or by implementing StateHolder.
>
> I'm not sure why the data isn't lost in your particular case without
> looking at your specific situation in a lot more detail.
>
> In my experience, data is stored in two different ways in JSF. In
> scoped beans, or in the component tree. The scope of scoped beans are
> hopefully self-explanatory. The state of the components themselves
> are stored in the response, and then restored when a request arrives.
> This effectively gives data stored by the components a page scope
> since they exist so long as the page doesn't change. Note that
> components store value bindings and method bindings (those #{} el
> expressions) as string literals, so the backing beans they point to
> are not stored in the component tree at page scope.
>
> Myfaces does have an x:saveState component that allows you to store
> data (including entire backing beans) as part of the component tree,
> effectively making the page-scoped (or more since you can preserve
> such values across pages. You still need to properly implement
> Serializable or StateHolder though.
>
> On 9/29/05, Navid Vahdat <[EMAIL PROTECTED]> wrote:
> > That seems to work. Thanks a lot, Mike!!!
> >
> > Another question just to make my understanding of things consistent: How
> > come the data isn't lost, when the session is serialized but this field is
> > transient? Isn't keeping the state the whole purpose of the StateManager
> > serializing the bean? Would it make more sense to make the object
> > serializable or transient? I'm confused...
> >
> > Cheers,
> > Navid
> >
> >
> > Mike Kienenberger wrote:
> > session-scoped backing beans are going to be serialized into your session.
> >
> > Any properties not marked transient on a serialized object are also
> > going to be serialized.
> >
> > Try marking your object reference as transient.
> >
> > Converters are used to convert objects into string representations on
> > your components stored in the html response (ie, the form values), and
> > vise-versa.
> >
> > They don't directly interact with session-scoped backing beans.
> >
> > On 9/29/05, Navid Vahdat <[EMAIL PROTECTED]> wrote:
> >
> >
> > The Object is not marked transient -- as is no other. It's part of a
> > property of a component's backing bean. AFAIK you're not forced to mark
> > them transient, are you?
> >
> > What is trying to serialize them is quite obvious from the stack trace.
> > It's the State Manager. The question is why! And why doesn't it call the
> > converter? My converter would provite it with a beautifully serializable
> > String.
> >
> > Mike Kienenberger wrote:
> >
> >
> >
> > Is your non-serialiable object marked as transient in your
> > session-scoped bean? If not, it'll be serialized...
> >
> > I think the first thing you'll want to do is to determine what is
> > trying to serialize it. Is it a managed bean or a component?
> >
> > On 9/29/05, Navid Vahdat <[EMAIL PROTECTED]> wrote:
> >
> >
> >
> >
> > Just bringing this subject up once more. Somebody able to say something
> > about it?
> >
> > Navid Vahdat wrote:
> > Hi Luca,
> >
> > the relevant JSP code is
> >
> > <tr>
> > <td>*<h:outputLabel for="type" value="DataType"/>:</td>
> > <td>
> > <table class="spreadingTable">
> > <tbody>
> > <tr>
> > <td class="left"><h:outputText
> > id="type_name" value="#{editListBean.dataObject.type.name}"
> > title="#{editListBean.dataObject.type.description}"/><h:inputHidden
> > id="type" value="#{editListBean.dataObject.type}" required="true"
> > converter="datatypeConverter" /></td>
> > <td>
> > <h:commandLink rendered="true"
> > action="#{editListBean.selectDataType}" id="selectDataTypeLink"
> > immediate="true">
> > <h:graphicImage rendered="true"
> > url="/images/small-lookingglass.gif" id="selectDataTypeImage" alt="small
> > looking glass" title="select typefilter"/>
> > </h:commandLink>
> > </td>
> > </tr>
> > </tbody>
> > </table>
> > <t:message for="type" styleClass="error" />
> > </td>
> > </tr>
> >
> > please find the whole JSP attached.
> >
> > editListBean is a session scope bean that holds a dataobject -- a detail of
> > a master/detail relationship. This data object has a type, which can be the
> > below metamodel.ListType it has a name, a description and a couple of other
> > fields. The type is set in the selectDataType Dialog, which is opened with
> > the small looking glass to the right of the output text.
> >
> > Thanks!
> >
> > Navid
> >
> > Luca Conte wrote:
> > Can U post the jsp code?
> > Navid Vahdat ha scritto:
> >
> >
> >
> > Can somebody give me a hand on this? The Exception seems to be
> > connected to using a h:inputhidden with a custom converter. When the
> > value is null, everithing is fine. When the value is set to an object
> > (in this case metamodel.ListType), rendering the page is fine, but
> > triggering a UICommand that is not immediate causes the Exception.
> >
> > I'm stuck. Is this a known bug?
> >
> > Navid
> >
> > Navid Vahdat wrote:
> >
> >
> >
> > Guys, I get this not serializable exception. The exception is
> > correct, because metamodel.ListType, a value in a hidden field with a
> > working converter, definitely is not serializable. Why is myFaces
> > (ver. 1.1.0) trying to serialize it?
> >
> > Thanks,
> > Navid
> >
> > 28.09.2005 10:26:51 org.apache.myfaces.util.StateUtils
> > encode64
> > SCHWERWIEGEND: Cannot encode Object with Base64
> > _java.io.NotSerializableException_: metamodel.ListType
> > at
> > java.io.ObjectOutputStream.writeObject0(_ObjectOutputStream.java:1054_)
> > at
> > java.io.ObjectOutputStream.writeArray(_ObjectOutputStream.java:1224_)
> > at
> > java.io.ObjectOutputStream.writeObject0(_ObjectOutputStream.java:1050_)
> > at
> > java.io.ObjectOutputStream.writeArray(_ObjectOutputStream.java:1224_)
> > at
> > java.io.ObjectOutputStream.writeObject0(_ObjectOutputStream.java:1050_)
> > at
> > java.io.ObjectOutputStream.writeArray(_ObjectOutputStream.java:1224_)
> > at
> > java.io.ObjectOutputStream.writeObject0(_ObjectOutputStream.java:1050_)
> > at
> > java.io.ObjectOutputStream.writeObject(_ObjectOutputStream.java:278_)
> > at java.util.ArrayList.writeObject(_ArrayList.java:529_)
> > at sun.reflect.GeneratedMethodAccessor294.invoke(Unknown
> > Source)
> > at
> > sun.reflect.DelegatingMethodAccessorImpl.invoke(_DelegatingMethodAccessorImpl.java:25_)
> >
> > at java.lang.reflect.Method.invoke(_Method.java:324_)
> > at
> > java.io.ObjectStreamClass.invokeWriteObject(_ObjectStreamClass.java:809_)
> >
> > at
> > java.io.ObjectOutputStream.writeSerialData(_ObjectOutputStream.java:1296_)
> >
> > at
> > java.io.ObjectOutputStream.writeOrdinaryObject(_ObjectOutputStream.java:1247_)
> >
> > at
> > java.io.ObjectOutputStream.writeObject0(_ObjectOutputStream.java:1052_)
> > at
> > java.io.ObjectOutputStream.writeArray(_ObjectOutputStream.java:1224_)
> > at
> > java.io.ObjectOutputStream.writeObject0(_ObjectOutputStream.java:1050_)
> > at
> > java.io.ObjectOutputStream.writeObject(_ObjectOutputStream.java:278_)
> > at java.util.ArrayList.writeObject(_ArrayList.java:529_)
> > at sun.reflect.GeneratedMethodAccessor294.invoke(Unknown
> > Source)
> > at
> > sun.reflect.DelegatingMethodAccessorImpl.invoke(_DelegatingMethodAccessorImpl.java:25_)
> >
> > at java.lang.reflect.Method.invoke(_Method.java:324_)
> > at
> > java.io.ObjectStreamClass.invokeWriteObject(_ObjectStreamClass.java:809_)
> >
> > at
> > java.io.ObjectOutputStream.writeSerialData(_ObjectOutputStream.java:1296_)
> >
> > at
> > java.io.ObjectOutputStream.writeOrdinaryObject(_ObjectOutputStream.java:1247_)
> >
> > at
> > java.io.ObjectOutputStream.writeObject0(_ObjectOutputStream.java:1052_)
> > at
> > java.io.ObjectOutputStream.writeArray(_ObjectOutputStream.java:1224_)
> > at
> > java.io.ObjectOutputStream.writeObject0(_ObjectOutputStream.java:1050_)
> > at
> > java.io.ObjectOutputStream.writeObject(_ObjectOutputStream.java:278_)
> > at
> > org.apache.myfaces.util.StateUtils.encode64(_StateUtils.java:33_)
> > at
> > org.apache.myfaces.renderkit.html.HtmlResponseStateManager.writeState(_HtmlResponseStateManager.java:104_)
> >
> > at
> > org.apache.myfaces.application.jsp.JspStateManagerImpl.writeState(_JspStateManagerImpl.java:268_)
> >
> > at
> > org.apache.myfaces.taglib.core.ViewTag.doAfterBody(_ViewTag.java:160_)
> > at
> > org.apache.jsp.EditList_jsp._jspx_meth_f_view_0(_EditList_jsp.java:201_)
> > at
> > org.apache.jsp.EditList_jsp._jspService(_EditList_jsp.java:128_)
> > at
> > org.apache.jasper.runtime.HttpJspBase.service(_HttpJspBase.java:94_)
> > at
> > javax.servlet.http.HttpServlet.service(_HttpServlet.java:802_)
> > at
> > org.apache.jasper.servlet.JspServletWrapper.service(_JspServletWrapper.java:324_)
> >
> > at
> > org.apache.jasper.servlet.JspServlet.serviceJspFile(_JspServlet.java:292_)
> >
> > at
> > org.apache.jasper.servlet.JspServlet.service(_JspServlet.java:236_)
> > at
> > javax.servlet.http.HttpServlet.service(_HttpServlet.java:802_)
> > at
> > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(_ApplicationFilterChain.java:237_)
> >
> > at
> > org.apache.catalina.core.ApplicationFilterChain.doFilter(_ApplicationFilterChain.java:157_)
> >
> > at
> > org.apache.catalina.core.ApplicationDispatcher.invoke(_ApplicationDispatcher.java:704_)
> >
> > at
> > org.apache.catalina.core.ApplicationDispatcher.processRequest(_ApplicationDispatcher.java:474_)
> >
> > at
> > org.apache.catalina.core.ApplicationDispatcher.doForward(_ApplicationDispatcher.java:409_)
> >
> > at
> > org.apache.catalina.core.ApplicationDispatcher.forward(_ApplicationDispatcher.java:312_)
> >
> > at
> > org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(_ServletExternalContextImpl.java:415_)
> >
> > at
> > org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(_JspViewHandlerImpl.java:234_)
> >
> > at
> > org.apache.myfaces.lifecycle.LifecycleImpl.render(_LifecycleImpl.java:300_)
> >
> > at
> > javax.faces.webapp.FacesServlet.service(_FacesServlet.java:95_)
> > at
> > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(_ApplicationFilterChain.java:237_)
> >
> > at
> > org.apache.catalina.core.ApplicationFilterChain.doFilter(_ApplicationFilterChain.java:157_)
> >
> > at
> > org.apache.catalina.core.StandardWrapperValve.invoke(_StandardWrapperValve.java:214_)
> >
> > at
> > org.apache.catalina.core.StandardValveContext.invokeNext(_StandardValveContext.java:104_)
> >
> > at
> > org.apache.catalina.core.StandardPipeline.invoke(_StandardPipeline.java:520_)
> >
> > at
> > org.apache.catalina.core.StandardContextValve.invokeInternal(_StandardContextValve.java:198_)
> >
> > at
> > org.apache.catalina.core.StandardContextValve.invoke(_StandardContextValve.java:152_)
> >
> > at
> > org.apache.catalina.core.StandardValveContext.invokeNext(_StandardValveContext.java:104_)
> >
> > at
> > org.apache.catalina.core.StandardPipeline.invoke(_StandardPipeline.java:520_)
> >
> > at
> > org.apache.catalina.core.StandardHostValve.invoke(_StandardHostValve.java:137_)
> >
> > at
> > org.apache.catalina.core.StandardValveContext.invokeNext(_StandardValveContext.java:104_)
> >
> > at
> > org.apache.catalina.valves.ErrorReportValve.invoke(_ErrorReportValve.java:118_)
> >
> > at
> > org.apache.catalina.core.StandardValveContext.invokeNext(_StandardValveContext.java:102_)
> >
> > at
> > org.apache.catalina.core.StandardPipeline.invoke(_StandardPipeline.java:520_)
> >
> > at
> > org.apache.catalina.core.StandardEngineValve.invoke(_StandardEngineValve.java:109_)
> >
> > at
> > org.apache.catalina.core.StandardValveContext.invokeNext(_StandardValveContext.java:104_)
> >
> > at
> > org.apache.catalina.core.StandardPipeline.invoke(_StandardPipeline.java:520_)
> >
> > at
> > org.apache.catalina.core.ContainerBase.invoke(_ContainerBase.java:929_)
> > at
> > org.apache.coyote.tomcat5.CoyoteAdapter.service(_CoyoteAdapter.java:160_)
> >
> > at
> > org.apache.coyote.http11.Http11Processor.process(_Http11Processor.java:799_)
> >
> > at
> > org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(_Http11Protocol.java:705_)
> >
> > at
> > org.apache.tomcat.util.net.TcpWorkerThread.runIt(_PoolTcpEndpoint.java:577_)
> >
> > at
> > org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(_ThreadPool.java:683_)
> >
> > at java.lang.Thread.run(_Thread.java:534_)
> >
> >
> >
> >
> >
> > ________________________________
> >
> >
> > <%@ page language="java" pageEncoding="UTF-8"%>
> > <%@ taglib uri="http://java.sun.com/jsf/html"; prefix="h" %>
> > <%@ taglib uri="http://java.sun.com/jsf/core"; prefix="f" %>
> > <%@ taglib uri="http://myfaces.apache.org/tomahawk";
> > prefix="t"%>
> >
> > <%
> > String path = request.getContextPath();
> > String basePath =
> > request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
> > %>
> >
> > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
> > <html>
> > <head>
> > <base href="<%=basePath%>">
> >
> > <title>Common Enterprise Integration Service Repository -- Edit
> > List</title>
> >
> > <meta http-equiv="pragma" content="no-cache">
> > <meta http-equiv="cache-control" content="no-cache">
> > <meta http-equiv="expires" content="0">
> > <link rel="stylesheet" href="T-Mobile-GUI.css" type="text/css" />
> > </head>
> > <body>
> >
> > <f:view>
> >
> > <f:loadBundle basename="resources.validation_messages" var="messages"/>
> > <table>
> > <tbody>
> > <tr>
> > <td colspan="2" rowspan="1" class="head">
> > <jsp:include page="head.jsp"/>
> > </td>
> > </tr>
> > <tr>
> > <td class="menu">
> > <jsp:include page="menu.jsp"/>
> > </td>
> > <td class="content">
> >
> > <t:messages id="messageList" styleClass="generalerror" showDetail="true"
> > globalOnly="true"/>
> > <h1>Create/Change/Delete ListType</h1>
> > <h:form>
> > <table>
> > <tbody>
> > <tr>
> > <td>*<h:outputLabel for="name" value="Name"/>:</td>
> > <td><h:inputText id="name" value="#{editListBean.dataObject.name}"
> > required="true"/><t:message for="name" styleClass="error"/></td>
> > </tr>
> > <tr>
> > <td>*<h:outputLabel for="version" value="Version"/>:</td>
> > <td><h:inputText id="version" value="#{editListBean.dataObject.version}"
> > required="true"/><t:message for="version" styleClass="error"/></td>
> > </tr>
> > <tr>
> > <td>*<h:outputLabel for="type" value="DataType"/>:</td>
> > <td>
> > <table class="spreadingTable">
> > <tbody>
> > <tr>
> > <td class="left"><h:outputText id="type_name"
> > value="#{editListBean.dataObject.type.name}"
> > title="#{editListBean.dataObject.type.description}"/><h:inputHidden
> > id="type" value="#{editListBean.dataObject.type}" required="true"
> > converter="datatypeConverter" /></td>
> > <td>
> > <h:commandLink rendered="true" action="#{editListBean.selectDataType}"
> > id="selectDataTypeLink" immediate="true">
> > <h:graphicImage rendered="true" url="/images/small-lookingglass.gif"
> > id="selectDataTypeImage" alt="small looking glass" title="select
> > typefilter"/>
> > </h:commandLink>
> > </td>
> > </tr>
> > </tbody>
> > </table>
> > <t:message for="type" styleClass="error" />
> > </td>
> > </tr>
> > <tr>
> > <td>MinLength:</td>
> > <td><h:inputText
> > value="#{editListBean.dataObject.minLength}"
> > required="false" rendered="true"/></td>
> > </tr>
> > <tr>
> > <td>MaxLength:</td>
> > <td><h:inputText
> > value="#{editListBean.dataObject.maxLength}"
> > required="false" rendered="true"/></td>
> > </tr>
> > </tbody>
> > </table>
> > <br>
> > Description:
> > <br>
> > <h:inputTextarea
> > value="#{editListBean.dataObject.description}" rows="10"
> > cols="50" rendered="true" required="false"/>
> > <br>
> > <br>
> > <f:subview id="createButtonBar" rendered="#{editListBean.create}">
> > <h:commandButton value="Create" action="#{editListBean.create}"
> > rendered="true"/>
> > <h:commandButton value="Cancel" action="#{editListBean.cancel}"
> > immediate="true" rendered="true"/>
> > </f:subview>
> > <f:subview id="updateButtonBar"
> > rendered="#{!editListBean.create}">
> > <h:commandButton value="Delete" action="#{editListBean.delete}"
> > rendered="true"
> > disabled="#{!editListBean.dataObject.deletable}"
> > immediate="true"/>
> > <h:commandButton value="Update" action="#{editListBean.update}"
> > rendered="true"/>
> > <h:commandButton value="Cancel" action="#{editListBean.cancel}"
> > immediate="true" rendered="true"/>
> > </f:subview>
> > </h:form>
> > </td>
> > </tr>
> > </tbody>
> > </table>
> >
> > </f:view>
> >
> > </body>
> > </html>
> >
> >
> >
> >
> >
> >
>
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