Spring.Net + ASP: Page instantiated twice

Question

I've based my project on Spring's Northwind example, but I must be doing something wrong. I'm having Spring construct a DAO object and inject it into an ASP page, which it does, but I see that the same page gets constructed by IIS, without the benefit of Spring's injection, and it's that latter page that gets run.

The page, WorkFlowDetail.aspx, inherits from a base class called BasePage1. BasePage1 has a public property for the DAO, giving us something like this:

BasePage1.vb:

Public Class BasePage1
    Inherits System.Web.UI.Page

    Private _wfdao As IWfDao
    Public Property wfDao As IWfDao
        Get
            Return _wfdao
        End Get
        Set(value As IWfDao)
            _wfdao = value
        End Set
    End Property
End Class

WorkFlowDetail.aspx.vb:

Public Class WorkFlowDetail
    Inherits BasePage1
End Class

Web.xml:

  <object name="BasePage1">
    <property name="wfDao" ref="wfDao" />
  </object>

  <object type="WorkFlowDetail.aspx" parent="BasePage1">
  </object>

Web.config:

<configuration>
  <configSections>
    <sectionGroup name="spring">
      <section name="context" type="Spring.Context.Support.WebContextHandler, Spring.Web" />
      <section name="parsers" type="Spring.Context.Support.NamespaceParsersSectionHandler, Spring.Core" />
    </sectionGroup>
  </configSections>

  <spring>
    <parsers>
      <parser type="Spring.Data.Config.DatabaseNamespaceParser, Spring.Data" />
      <parser type="Spring.Transaction.Config.TxNamespaceParser, Spring.Data" />
    </parsers>
    <context annotation-config="">
      <resource uri="~/Config/Aspects.xml" />
      <resource uri="~/Web.xml" />
    </context>
  </spring>

  <system.web>
    <httpHandlers>
      <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false" />
      <add verb="*" path="*.aspx" type="Spring.Web.Support.PageHandlerFactory, Spring.Web"/>
    </httpHandlers>
    <httpModules>
      <add name="Spring" type="Spring.Context.Support.WebSupportModule, Spring.Web"/>
    </httpModules>
  </system.web>

  <system.webServer>
    <handlers>
      <add name="SpringPageHandler" verb="*" path="*.aspx" type="Spring.Web.Support.PageHandlerFactory, Spring.Web"/>
      <add name="SpringWebServiceHandler" verb="*" path="*.asmx" type="Spring.Web.Services.WebServiceHandlerFactory, Spring.Web" />
      <add name="SpringContextMonitor" verb="*" path="ContextMonitor.ashx" type="Spring.Web.Support.ContextMonitor, Spring.Web"/>
      <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" />
    </handlers>
    <modules runAllManagedModulesForAllRequests="true">
      <add name="Spring" type="Spring.Context.Support.WebSupportModule, Spring.Web" />
      <add name="OpenSessionInView" type="Spring.Data.NHibernate.Support.OpenSessionInViewModule, Spring.Data.NHibernate32" />
    </modules>
    <validation validateIntegratedModeConfiguration="false" />
  </system.webServer>

  <appSettings>
    <add key="Spring.Data.NHibernate.Support.OpenSessionInViewModule.SessionFactoryObjectName" value="NHibernateSessionFactory" />
  </appSettings>

</configuration>

[Clearly I've left out a lot of stuff that I don't think is relevant.]

Setting a couple of strategic breakpoints I find that WorkFlowDetail.aspx gets constructed first by Spring and the DAO object is injected. It shows up in the debugger's Watch list as a "(ASP.workflowdetail_aspx)" and the stack looks like this:

[External Code] 
Spring.Web.dll!Spring.Util.VirtualEnvironment.HttpRuntimeEnvironment.CreateInstanceFromVirtualPath(string virtualPath, System.Type requiredBaseType) Line 409 + 0x12 bytes  C#
Spring.Web.dll!Spring.Util.VirtualEnvironment.CreateInstanceFromVirtualPath(string virtualPath, System.Type requiredBaseType) Line 515 + 0x44 bytes C#
Spring.Web.dll!Spring.Objects.Factory.Support.WebObjectUtils.CreateHandler(string pageUrl) Line 156 + 0x20 bytes    C#
Spring.Web.dll!Spring.Objects.Factory.Support.WebObjectUtils.CreatePageInstance(string pageUrl) Line 105 + 0xc bytes    C#
Spring.Web.dll!Spring.Objects.Factory.Support.WebInstantiationStrategy.Instantiate(Spring.Objects.Factory.Support.RootObjectDefinition definition, string name, Spring.Objects.Factory.IObjectFactory factory) Line 76 + 0x50 bytes C#
Spring.Core.dll!Spring.Objects.Factory.Support.AbstractAutowireCapableObjectFactory.InstantiateObject(string objectName, Spring.Objects.Factory.Support.RootObjectDefinition definition) Line 1036 + 0x43 bytes C#
Spring.Core.dll!Spring.Objects.Factory.Support.AbstractAutowireCapableObjectFactory.CreateObjectInstance(string objectName, Spring.Objects.Factory.Support.RootObjectDefinition objectDefinition, object[] arguments) Line 1000 + 0x2a bytes    C#
Spring.Core.dll!Spring.Objects.Factory.Support.AbstractAutowireCapableObjectFactory.InstantiateObject(string name, Spring.Objects.Factory.Support.RootObjectDefinition definition, object[] arguments, bool allowEagerCaching, bool suppressConfigure) Line 904 + 0x21 bytes    C#
Spring.Core.dll!Spring.Objects.Factory.Support.AbstractObjectFactory.GetObjectInternal(string name, System.Type requiredType, object[] arguments, bool suppressConfigure) Line 2037 + 0x3a bytes    C#
Spring.Core.dll!Spring.Objects.Factory.Support.AbstractObjectFactory.CreateObject(string name, System.Type requiredType, object[] arguments) Line 1817 + 0x1e bytes C#
Spring.Core.dll!Spring.Context.Support.AbstractApplicationContext.CreateObject(string name, System.Type requiredType, object[] arguments) Line 1495 + 0x4d bytes    C#
Spring.Web.dll!Spring.Web.Support.PageHandlerFactory.CreateHandlerInstance(Spring.Context.IConfigurableApplicationContext appContext, System.Web.HttpContext context, string requestType, string rawUrl, string physicalPath) Line 108 + 0x85 bytes C#
Spring.Web.dll!Spring.Web.Support.AbstractHandlerFactory.GetHandler(System.Web.HttpContext context, string requestType, string url, string physicalPath) Line 208 + 0x43 bytes  C#
Spring.Web.dll!Spring.Web.Support.PageHandlerFactory.GetHandler(System.Web.HttpContext context, string requestType, string url, string physicalPath) Line 77 + 0x23 bytes   C#
[External Code]

Then the constructor is called again. This time the object shows up as "scheduleSite.WorkFlowDetail" in the debugger's Watch list and the stack just shows

[External Code]

Please tell me what I'm doing wrong with this configuration. I've already tried leaving all mention of BasePage1 out of Web.xml, with the same results.

UPDATE:

First-of-all, the page is being constructed more than just twice; I thought only twice because it was throwing an exception on the second time, but I find that if I get past there I hit the constructor 3-4 more times.

Second, I suspect that my problems stem from a misconfiguration of Web.config. I notice that Northwind has only the <system.web> section, whereas my app (set up before I came onto the project) has both <system.web> and <system.webServer>. Northwind is targeting .NET 3.5 whereas we're targeting 4.0 and IIS7.0 in Integrated mode. I'm now looking into how to configure it, but would still appreciate help.

Is it working if you derive your base page from `Spring.Web.UI.Page` instead of `System.Web.UI.Page`? — Darin Dimitrov, Feb 16 '14 at 17:31
Unfortunately, that made no difference. Thanks for trying, though. — Michael, Feb 17 '14 at 05:56

Spring.Net + ASP: Page instantiated twice

0 Answers0