Class JndiObjectFactoryBean

java.lang.Object
org.springframework.jndi.JndiAccessor
org.springframework.jndi.JndiLocatorSupport
org.springframework.jndi.JndiObjectLocator
org.springframework.jndi.JndiObjectFactoryBean
All Implemented Interfaces:
Aware, BeanClassLoaderAware, BeanFactoryAware, FactoryBean<Object>, InitializingBean
public class JndiObjectFactoryBean extends JndiObjectLocator implements FactoryBean<Object>, BeanFactoryAware, BeanClassLoaderAware
FactoryBean that looks up a JNDI object. Exposes the object found in JNDI for bean references, for example, for data access object's "dataSource" property in case of a DataSource.

The typical usage will be to register this as singleton factory (for example, for a certain JNDI-bound DataSource) in an application context, and give bean references to application services that need it.

The default behavior is to look up the JNDI object on startup and cache it. This can be customized through the "lookupOnStartup" and "cache" properties, using a JndiObjectTargetSource underneath. Note that you need to specify a "proxyInterface" in such a scenario, since the actual JNDI object type is not known in advance.

Of course, bean classes in a Spring environment may look up, for example, a DataSource from JNDI themselves. This class simply enables central configuration of the JNDI name, and easy switching to non-JNDI alternatives. The latter is particularly convenient for test setups, reuse in standalone clients, etc.

Note that switching to, for example, DriverManagerDataSource is just a matter of configuration: Simply replace the definition of this FactoryBean with a DriverManagerDataSource definition!

Since:
22.05.2003
Author:
Juergen Hoeller
See Also:

  • Constructor Details

    • JndiObjectFactoryBean

      public JndiObjectFactoryBean()

  • Method Details

    • setProxyInterface

      public void setProxyInterface(Class<?> proxyInterface)
      Specify the proxy interface to use for the JNDI object.

      Typically used in conjunction with "lookupOnStartup"=false and/or "cache"=false. Needs to be specified because the actual JNDI object type is not known in advance in case of a lazy lookup.

      See Also:

    • setProxyInterfaces

      public void setProxyInterfaces(Class<?>... proxyInterfaces)
      Specify multiple proxy interfaces to use for the JNDI object.

      Typically used in conjunction with "lookupOnStartup"=false and/or "cache"=false. Note that proxy interfaces will be autodetected from a specified "expectedType", if necessary.

      See Also:

    • setLookupOnStartup

      public void setLookupOnStartup(boolean lookupOnStartup)
      Set whether to look up the JNDI object on startup. Default is "true".

      Can be turned off to allow for late availability of the JNDI object. In this case, the JNDI object will be fetched on first access.

      For a lazy lookup, a proxy interface needs to be specified.

      See Also:

    • setCache

      public void setCache(boolean cache)
      Set whether to cache the JNDI object once it has been located. Default is "true".

      Can be turned off to allow for hot redeployment of JNDI objects. In this case, the JNDI object will be fetched for each invocation.

      For hot redeployment, a proxy interface needs to be specified.

      See Also:

    • setExposeAccessContext

      public void setExposeAccessContext(boolean exposeAccessContext)
      Set whether to expose the JNDI environment context for all access to the target object, i.e. for all method invocations on the exposed object reference.

      Default is "false", i.e. to only expose the JNDI context for object lookup. Switch this flag to "true" in order to expose the JNDI environment (including the authorization context) for each method invocation, as needed by WebLogic for JNDI-obtained factories (for example, JDBC DataSource, JMS ConnectionFactory) with authorization requirements.

    • setDefaultObject

      public void setDefaultObject(Object defaultObject)
      Specify a default object to fall back to if the JNDI lookup fails. Default is none.

      This can be an arbitrary bean reference or literal value. It is typically used for literal values in scenarios where the JNDI environment might define specific config settings but those are not required to be present.

      Note: This is only supported for lookup on startup. If specified together with JndiObjectLocator.setExpectedType(Class), the specified value needs to be either of that type or convertible to it.

      See Also:

    • setBeanFactory

      public void setBeanFactory(BeanFactory beanFactory)
      Description copied from interface: BeanFactoryAware
      Callback that supplies the owning factory to a bean instance.

      Invoked after the population of normal bean properties but before an initialization callback such as InitializingBean.afterPropertiesSet() or a custom init-method.

      Specified by:
      setBeanFactory in interface BeanFactoryAware
      Parameters:
      beanFactory - owning BeanFactory (never null). The bean can immediately call methods on the factory.
      See Also:

    • setBeanClassLoader

      public void setBeanClassLoader(ClassLoader classLoader)
      Description copied from interface: BeanClassLoaderAware
      Callback that supplies the bean class loader to a bean instance.

      Invoked after the population of normal bean properties but before an initialization callback such as InitializingBean's InitializingBean.afterPropertiesSet() method or a custom init-method.

      Specified by:
      setBeanClassLoader in interface BeanClassLoaderAware
      Parameters:
      classLoader - the owning class loader

    • afterPropertiesSet

      public void afterPropertiesSet() throws IllegalArgumentException, NamingException
      Look up the JNDI object and store it.
      Specified by:
      afterPropertiesSet in interface InitializingBean
      Overrides:
      afterPropertiesSet in class JndiObjectLocator
      Throws:
      IllegalArgumentException
      NamingException

    • lookupWithFallback

      protected Object lookupWithFallback() throws NamingException
      Lookup variant that returns the specified "defaultObject" (if any) in case of lookup failure.
      Returns:
      the located object, or the "defaultObject" as fallback
      Throws:
      NamingException - in case of lookup failure without fallback
      See Also:

    • getObject

      public @Nullable Object getObject()
      Return the singleton JNDI object.
      Specified by:
      getObject in interface FactoryBean<Object>
      Returns:
      an instance of the bean (can be null)
      See Also:

    • getObjectType

      public @Nullable Class<?> getObjectType()
      Description copied from interface: FactoryBean
      Return the type of object that this FactoryBean creates, or null if not known in advance.

      This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

      In the case of implementations that create a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

      This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

      NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore, it is highly recommended to implement this method properly, using the current state of the FactoryBean.

      Specified by:
      getObjectType in interface FactoryBean<Object>
      Returns:
      the type of object that this FactoryBean creates, or null if not known at the time of the call
      See Also:

    • isSingleton

      public boolean isSingleton()
      Description copied from interface: FactoryBean
      Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

      NOTE: If a FactoryBean indicates that it holds a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

      The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

      NOTE: This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean.isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

      The default implementation returns true, since a FactoryBean typically manages a singleton instance.

      Specified by:
      isSingleton in interface FactoryBean<Object>
      Returns:
      whether the exposed object is a singleton
      See Also:

    • createCompositeInterface

      protected Class<?> createCompositeInterface(Class<?>[] interfaces)
      Create a composite interface Class for the given interfaces, implementing the given interfaces in one single Class.

      The default implementation builds a JDK proxy class for the given interfaces.

      Parameters:
      interfaces - the interfaces to merge
      Returns:
      the merged interface as Class
      See Also: