On Kestrel,
When package is defined by ClassLoader.definePackage correctly,
1)only "name" is returned by ClassLoader.getPackage.
2)Package information can not get by Package.get* methods and
null is returned.
(ex.getSpecificationTitle, getSpecificationVersion....)
3) Package.isCompatibleWith() causes NumberFormatException


On the other hand, package is defined as same way, on Cricket
1)"name", "tilte" and "version" are returned by ClassLoader.getPackage
2)Package information is get by Package.get* methods
3) Package.isCompatibleWith() returns true


To reproduce,

1)Extract attached file.
2)Run PackageTest
3)You can see the result

The part of the result is as below;

*********result of ClassLoader.getPackage :package cat
Name :cat
--- Package.getSpecificationTitle()
SpecificationTitle :null
--- Package.getSpecificationVersion()
SpecificationVersion :null
--- Package.getSpecificationVendor()
SpecificationVendor :null
--- Package.getImplementationTitle()
ImplementationTitle :null
--- Package.getImplementationVersion()
ImplementationVersion :null
--- Package.getImplementationVendor()
ImplementationVendor :null
--- Package.isCompatibleWith()
!!!exception : java.lang.NumberFormatException: Empty version string
--- Package.toString()