Question

<bean id="data.emf"
  class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"  >
  <property name="persistenceUnitName" value="transactions-optional" />

 </bean>

from what i know by default all bean are singleton (according to document) but i somehow still getting duplicated creating of entitymanagerfactory. is there any parameter i can set for bean above in spring 3.0 to force singleton? the problem only appear in gae production, on hosted mode, no problem

Answer 1

You can force a bean to be a singleton like this:

<bean scope="singleton" ... >
</bean>

You generally don’t need to do this, however, since singleton is the default scope, and there’s no way to change the default.

The Spring DEBUG-level logs will generate entries every time a bean is instantiated, so have a look through there to see when and where your bean is being processed.