springframework-developer

[Springframework-developer] Protype Scope of Spring Bean - creates problematic singleton instance

[Jaga <v.j...@gm...>]

hi,

When I tried with the prototype scope in spring, on opening two browsers
there
 is only one instance is created. 

Hence the value of the recently accessed instance by the user is retrieved.

version used: spring-beans-2.0.xsd

Snippet:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<bean id="obj1" class="com.dto.Class1" scope="prototype">
</bean>

Please help.

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Re: [Springframework-developer] Protype Scope of Spring Bean - creates problematic singleton instance

[Lachezar D. <l.d...@gm...>]

  You also need to post the code where you obtain references to the bean.
  Commonly people miss the fact, that prototype beans are instantiated
on every obtaining, not on every call.
  When a property of a singleton class is referencing a prototype bean
the property value has the same scope as the referencing bean, not the
referenced one.

2008/6/9 Jaga <v.j...@gm...>:
>
> hi,
>
> When I tried with the prototype scope in spring, on opening two browsers
> there
>  is only one instance is created.
>
> Hence the value of the recently accessed instance by the user is retrieved.
>
> version used: spring-beans-2.0.xsd
>
> Snippet:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <beans xmlns="http://www.springframework.org/schema/beans"
>       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>       xsi:schemaLocation="http://www.springframework.org/schema/beans
> http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
>
> <bean id="obj1" class="com.dto.Class1" scope="prototype">
> </bean>
>
> Please help.
>
> --
> View this message in context: http://www.nabble.com/Protype-Scope-of-Spring-Bean---creates-problematic-singleton-instance-tp17727103p17727103.html
> Sent from the springframework-developer mailing list archive at Nabble.com.
>
>
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Re: [Springframework-developer] Protype Scope of Spring Bean - creates problematic singleton instance

[Jaga <v.j...@gm...>]

Actual code snippet where the bean is being referred.


<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> 
		
<bean id="assetExposureReportController"
class="com.sp.cms.cdointerface.portlet.controller.AssetExposureReportController"
scope="prototype">
		<property name="sessionForm" value="true"/>
<property name="commandName"><value>formBean</value></property>
<property
name="commandClass"><value>com.sp.cms.cdointerface.portlet.form.AssetExposureReportFormBean</value></property>
</bean>

On accessing this bean in multiple browsers, recently accessed instance's
value is retrieved across the browsers.

--
Jag



Jaga wrote:
> 
> hi,
> 
> When I tried with the prototype scope in spring, on opening two browsers
> there
>  is only one instance is created. 
> 
> Hence the value of the recently accessed instance by the user is
> retrieved.
> 
> version used: spring-beans-2.0.xsd
> 
> Snippet:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <beans xmlns="http://www.springframework.org/schema/beans"
>        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>        xsi:schemaLocation="http://www.springframework.org/schema/beans 
> http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
> 
> <bean id="obj1" class="com.dto.Class1" scope="prototype">
> </bean>
> 
> Please help.
> 
> 

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Re: [Springframework-developer] Protype Scope of Spring Bean - creates problematic singleton instance

[Lachezar D. <l.d...@gm...>]

  Web Controllers are singletons by design, they get instantiated only
once, with the option to instantiate a controller upon first request,
and handle all matching requests.

  Probably the 'easiest' way to achieve what you need is to declare a
scoped proxy for your controller, that should be Request Scoped.

  <beans
    ...
    xmlns:aop="http://www.springframework.org/schema/aop"
  >
    <bean id="..." class="..." scope="request">
      <aop:scoped-proxy proxy-target-class="true" />
       ...
    </bean>
  </beans>

  Did you check the ThrowAwayController class? I have not used it,
however it seems it provides some one-time-use-only work flow.

  It is not my <job> to criticize your design, but Controllers should
be stateless services. Putting state in the controller is probably a
good way to get a bad headache.

  And if your Controller IS stateless I don;t see a reason why it
can't be singleton scoped.


2008/6/9, Jaga <v.j...@gm...>:
>
>
>  Actual code snippet where the bean is being referred.
>
>
>
>  <?xml version="1.0" encoding="UTF-8"?>
>  <beans xmlns="http://www.springframework.org/schema/beans"
>   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>   xsi:schemaLocation="http://www.springframework.org/schema/beans
>  http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
>
>
> <bean id="assetExposureReportController"
>  class="com.sp.cms.cdointerface.portlet.controller.AssetExposureReportController"
>  scope="prototype">
>                 <property name="sessionForm" value="true"/>
>  <property name="commandName"><value>formBean</value></property>
>  <property
>  name="commandClass"><value>com.sp.cms.cdointerface.portlet.form.AssetExposureReportFormBean</value></property>
>  </bean>
>
>  On accessing this bean in multiple browsers, recently accessed instance's
>  value is retrieved across the browsers.
>
>  --
>  Jag
>
>
>
>
>  Jaga wrote:
>  >
>  > hi,
>  >
>  > When I tried with the prototype scope in spring, on opening two browsers
>  > there
>  >  is only one instance is created.
>  >
>  > Hence the value of the recently accessed instance by the user is
>  > retrieved.
>  >
>  > version used: spring-beans-2.0.xsd
>  >
>  > Snippet:
>  >
>  > <?xml version="1.0" encoding="UTF-8"?>
>  > <beans xmlns="http://www.springframework.org/schema/beans"
>  >        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>  >        xsi:schemaLocation="http://www.springframework.org/schema/beans
>  > http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
>  >
>  > <bean id="obj1" class="com.dto.Class1" scope="prototype">
>  > </bean>
>  >
>  > Please help.
>  >
>  >
>
>  --
>
> View this message in context: http://www.nabble.com/Protype-Scope-of-Spring-Bean---creates-problematic-singleton-instance-tp17727103p17729307.html
>
> Sent from the springframework-developer mailing list archive at Nabble.com.
>
>
>  -------------------------------------------------------------------------
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