ModuleInfo extends AnnotatedElement
mandy.chung at oracle.com
Tue Apr 20 14:33:50 PDT 2010
The current API only supports to read annotations of a module when the
module has been installed by using the java.lang.reflect.Module API
(that extends AnnotatedElement). There are cases that one would want
to read the annotations from module-info while the module is being
installed. For example, a module can include some annotation to specify
the installation requirement that can be used to determine if the module
installation should continue based on the system configuration. It is
an opportunity to eliminate transfers of the entire module and its
dependencies if not needed.
We need to provide an API to read the annotations from module-info but
the module may not be installed or downloaded at all.
One proposal is to extend java.lang.module.ModuleInfo to extend
It will not load any classes referenced by annotations for this
ModuleInfo until the getAnnotation or other method specified in the
AnnotatedElement interface is called (since those classes might not
exist or be found by the class loader). In other word, this change will
not affect the current module loading/resolution. It will use the
current module class loader to find classes to construct the Annotation
objects. If the type of an annotation's element cannot be found, it
will result in a TypeNotPresentException in the current proposed
specification. TypeNotPresentException is an unchecked exception and
perhaps it'd be better to throw a checked exception.
Any comment, opinion?
Joe, your feedback would be helpful.
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