web.xml configuration for Spring
/* The ContextLoaderListener listener should be registered after
Log4jConfigListener
in web.xml, if the latter is used.
*/
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
once thats configured you'll want to use MethodInvokingFactoryBean for
FactoryBean which returns a value which is the result of a static or instance
method invocation
http://static.springsource.org/spring/docs/1.2.x/api/org/springframework/beans/factory/config/MethodInvokingFactoryBean.html
as mentioned singleton="true" assures you will load,instantiate and store a
cached bean
static factory methods:
An example (in an XML based bean factory definition) of a bean definition
which uses this class to call a STATIC factory method:
<bean id="myObject"
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property
name="staticMethod"><value>com.whatever.MyClassFactory.getInstance</value></property>
</bean>
<!-- this example will acquire a (target) instance specific version of System
defined (version) property -->
<bean id="sysProps"
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetClass"><value>java.lang.System</value></property>
<property name="targetMethod"><value>getProperties</value></property>
</bean>
<bean id="javaVersion"
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetObject"><ref local="sysProps"/></property>
<property name="targetMethod"><value>getProperty</value></property>
<property name="arguments">
<list>
<value>java.version</value>
</list>
</property>
</bean>Since your question addresses GarbageCollection it would be good to
know the difference
between Spring's Beans loader between ApplicationContext (a load class which
implements ApplicationContextAware) and BeanFactory (a class which implements
BeanFactoryAware)
BeanFactory:
1a)Container locates beans definition (usually derivation of *beans.xml)
1b)Container Loads beans into Container
2)is instantiated LATER with getBean() method
ApplicationContext:
1a)Container locates beans definition depeding on invoking class
-ClassPathXMLApplicationContext-Loads XML from Classpath
-FileSystemXMLApplicationContext-Loads context from XML file in filesystem
-XMLWebApplicationContext-Loads Context from
XML(beans.xml/ApplicationContext.xml) contained with webApplication
1b)Container loads and instantiates all beans into Container
so if you see alot of GC activity from jheap or J2EE Server logs you will
probably want to consider using BeanFactoryAware implementor class instead of
default ApplicationContextAware implementor class
hope this helps
Martin Gainty
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> Date: Fri, 10 Jul 2009 11:10:17 -0400
> From: d...@newfield.org
> To: user@struts.apache.org
> Subject: Re: Actions are not Garbage Collected
>
> Musachy Barroso wrote:
> > On Fri, Jul 10, 2009 at 7:53 AM, Musachy Barroso<musa...@gmail.com> wrote:
> >> If your actions are singletons (and they shouldn't be!) then they
> >> are not likely to be collected.
> >
> > because a reference to them will be held by spring, or whatever
> > container you are using.
>
> Or maybe clickstream? http://www.opensymphony.com/clickstream
>
> A brief look at the source
> https://svn.opensymphony.com/svn/clickstream/trunk appears to indicate
> that it only saves stuff extracted from the request object, but maybe I
> missed where it's also saving a reference to the request (and therefore
> the action) itself?
>
> -Dale
>
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