Thanks for warning me. Yes, I am already aware of the fact that
bootdelegation="*" is not a very good thing, but I have a requirement
that any jar in my product's library directory must be available to all
other applications running in the system. To implement this in OSGi, I
don't see any other alternative, do you?
Thanks,
Sahoo
Felix Meschberger wrote:
Hi Sahoo,
While I agree, that this is probably a bug in the Felix framework, I
consider this use of the bootdelegation property very dangerous. The
reason for this is that you loose all control of where classes are
loaded from and thus let go off all the good modularization
functionality of OSGi.
Consider for example, you have a bundle, which uses JDOM, which is
notable for not being backwards compatible between its later 0.x
versions. If a version of the JDOM library happens to be on the boot
class path, your bundle will ALLWAYS use that boot class path JDOM
library regardless of whether the bundle exports/imports it or uses it
from a private copy. This is probably not what you want - and would lead
to errors, which would be hard to track.
Regards
Felix
Am Dienstag, den 15.01.2008, 09:18 +0530 schrieb Sahoo:
Hi,
I am having trouble starting Felix when I use
-Dorg.osgi.framework.bootdelegation="*". When I run using the following
command:
'/usr/bin/java -Dorg.osgi.framework.bootdelegation="*" -jar
bin/felix.jar', it fails like this:
WARNING: *** Class 'org.apache.felix.shell.impl.Activator' was not
found. Bundle 1 does not import package 'org.apache.felix.shell.impl',
nor is the package exported by any other bundle or available from the
system class loader. *** (java.lang.ClassNotFoundException: *** Class
'org.apache.felix.shell.impl.Activator' was not found. Bundle 1 does not
import package 'org.apache.felix.shell.impl', nor is the package
exported by any other bundle or available from the system class loader.
***)ERROR: Error starting
file:bundle/org.apache.felix.shell-1.1.0-SNAPSHOT.jar
(org.osgi.framework.BundleException: Not found:
org.apache.felix.shell.impl.Activator)
java.lang.ClassNotFoundException: org.apache.felix.shell.impl.Activator
at
org.apache.felix.framework.Felix.createBundleActivator(Felix.java:3438)
at org.apache.felix.framework.Felix._startBundle(Felix.java:1540)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1479)
at
org.apache.felix.framework.Felix.setFrameworkStartLevel(Felix.java:1074)
at
org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:258)
at java.lang.Thread.run(Thread.java:595)
Section #3.8.4, Overall Search Order, of OSGi Service Platform Release 4
spec does not clearly (or I don't understand it well enough) state what
should be the behavior. Relevant portions of the spec is given below:
/1 If the class or resource is in a java.* package, the request is
delegated to the parent class loader; otherwise, the search continues
with the next step. If the request is delegated to the parent class
loader and the class or resource is not found, then the search
terminates and the request fails.
2 If the class or resource is from a package included in the boot
delegation list (org.osgi.framework.bootdelegation), then the request is
delegated to the parent class loader. If the class or resource is found
there, the search ends.
/
Unlike point #1 above, point #2 does not mandate the search to
terminate. I can understand the search terminating for java.* packages,
but why for other packages? It seems Felix is terminating the search,
therefore I am seeing this failure. Can anyone please clarify this? I am
using "*, " because I want to see how I can make packages from some
library jars available to bundles without having to set
org.osgi.framework.system.packages property?
I am hoping that if I add my library jars in system classpath and set
bootdelegation="*", the library jar's content will be automatically
available to other bundles even if I don't set
org.osgi.framework.system.packages property. Is this not going to work?
Thanks,
Sahoo
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