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>
>
>
>
>
>
>
