Class ClassManagerImpl

java.lang.Object
bsh.BshClassManager
bsh.classpath.ClassManagerImpl

public class ClassManagerImpl extends BshClassManager
Manage all classloading in BeanShell.
Allows classpath extension and class file reloading.

This class holds the implementation of the BshClassManager so that it
can be separated from the core package.

This class currently relies on 1.2 for BshClassLoader and weak references.
Is there a workaround for weak refs?  If so we could make this work
with 1.1 by supplying our own classloader code...

See "http://www.beanshell.org/manual/classloading.html" for details
on the bsh classloader architecture.

Bsh has a multi-tiered class loading architecture.  No class loader is
created unless/until a class is generated, the classpath is modified, 
or a class is reloaded.

Note: we may need some synchronization in here

Note on jdk1.2 dependency:

We are forced to use weak references here to accomodate all of the 
fleeting namespace listeners.  (NameSpaces must be informed if the class 
space changes so that they can un-cache names).  I had the interesting 
thought that a way around this would be to implement BeanShell's own 
garbage collector...  Then I came to my senses and said - screw it, 
class re-loading will require 1.2.

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Classloading precedence:

in-script evaluated class (scripted class)
in-script added / modified classpath

optionally, external classloader
optionally, thread context classloader

plain Class.forName()
source class (.java file in classpath)