Class CachedIntrospectionResults
PropertyDescriptor
information for a Java class. Not intended for direct use by application code.
Necessary for Spring's own caching of bean descriptors within the application
ClassLoader
, rather than relying on the JDK's system-wide BeanInfo
cache (in order to avoid leaks on individual application shutdown in a shared JVM).
Information is cached statically, so we don't need to create new
objects of this class for every JavaBean we manipulate. Hence, this class
implements the factory design pattern, using a private constructor and
a static forClass(Class)
factory method to obtain instances.
Note that for caching to work effectively, some preconditions need to be met: Prefer an arrangement where the Spring jars live in the same ClassLoader as the application classes, which allows for clean caching along with the application's lifecycle in any case.
As of 6.0, Spring's default introspection discovers basic JavaBeans properties
through an efficient method reflection pass. For full JavaBeans introspection
including indexed properties and all JDK-supported customizers, configure a
META-INF/spring.factories
file with the following content:
org.springframework.beans.BeanInfoFactory=org.springframework.beans.StandardBeanInfoFactory
For Spring 5.3 compatible extended introspection including non-void setter methods:
org.springframework.beans.BeanInfoFactory=org.springframework.beans.ExtendedBeanInfoFactory
- Since:
- 05 May 2001
- Author:
- Rod Johnson, Juergen Hoeller
- See Also:
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acceptClassLoader(ClassLoader)
clearClassLoader(ClassLoader)
forClass(Class)
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Method Summary
Modifier and TypeMethodDescriptionstatic void
acceptClassLoader
(ClassLoader classLoader) Accept the given ClassLoader as cache-safe, even if its classes would not qualify as cache-safe in this CachedIntrospectionResults class.static void
clearClassLoader
(ClassLoader classLoader) Clear the introspection cache for the given ClassLoader, removing the introspection results for all classes underneath that ClassLoader, and removing the ClassLoader (and its children) from the acceptance list.
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Method Details
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acceptClassLoader
Accept the given ClassLoader as cache-safe, even if its classes would not qualify as cache-safe in this CachedIntrospectionResults class.This configuration method is only relevant in scenarios where the Spring classes reside in a 'common' ClassLoader (e.g. the system ClassLoader) whose lifecycle is not coupled to the application. In such a scenario, CachedIntrospectionResults would by default not cache any of the application's classes, since they would create a leak in the common ClassLoader.
Any
acceptClassLoader
call at application startup should be paired with aclearClassLoader(java.lang.ClassLoader)
call at application shutdown.- Parameters:
classLoader
- the ClassLoader to accept
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clearClassLoader
Clear the introspection cache for the given ClassLoader, removing the introspection results for all classes underneath that ClassLoader, and removing the ClassLoader (and its children) from the acceptance list.- Parameters:
classLoader
- the ClassLoader to clear the cache for
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