org.springframework.beans

## Class CachedIntrospectionResults

- java.lang.Object
- - org.springframework.beans.CachedIntrospectionResults

-     public class CachedIntrospectionResults
      extends Object

  Internal class that caches JavaBeans `PropertyDescriptor` information for a Java class. Not intended for direct use by application code.

  Necessary for own caching of descriptors within the application's ClassLoader, rather than rely on the JDK's system-wide BeanInfo cache (in order to avoid leaks on ClassLoader shutdown).

  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.

  Since:
    05 May 2001
  Author:
    Rod Johnson, Juergen Hoeller
  See Also:
    `acceptClassLoader(ClassLoader)`, `clearClassLoader(ClassLoader)`, `forClass(Class)`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static 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 deregistering the ClassLoader (and any of its children) from the acceptance list.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Method Detail

    - #### acceptClassLoader

          public static 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.

      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 a `clearClassLoader(java.lang.ClassLoader)` call at application shutdown.

      Parameters:
        `classLoader` - the ClassLoader to accept

    - #### clearClassLoader

          public static void clearClassLoader(ClassLoader classLoader)

      Clear the introspection cache for the given ClassLoader, removing the introspection results for all classes underneath that ClassLoader, and deregistering the ClassLoader (and any of its children) from the acceptance list.
      Parameters:
        `classLoader` - the ClassLoader to clear the cache for