metatech created KARAF-2359:
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Summary: DirectoryWatcher for "deploy" directory should be
configured to wait until framework start level reaches 60
Key: KARAF-2359
URL: https://issues.apache.org/jira/browse/KARAF-2359
Project: Karaf
Issue Type: Bug
Components: karaf-config
Affects Versions: 2.2.11
Environment: ServiceMix 4.4.2 and 4.5.1
Reporter: metatech
Problem :
By default, the DirectoryWatcher of Felix scans for new files very early in the
start process. If a new application bundle is added to the "deploy" directory,
it might be detected and started while the framework start level is still at
30, although the application bundle start should be postponed until level 60 is
reached.
If not, a typical problem will be that Camel-core is deployed after the
application bundle, thereby not using the OSGi-aware CamelContext, causing some
Camel components not to be found, with errors such as the following :
Caused by: org.apache.camel.ResolveEndpointFailedException: Failed to resolve
endpoint: sql://SELECT 1 from DUAL?dataSourceRef=myDS due to: No component
found with scheme: sql
A hint to the root cause of the problem can be found in the logs :
CamelNamespaceHandler | OSGi environment not detected.
By default, the property "felix.fileinstall.start.level" in file
"org.apache.felix.fileinstall-deploy.cfg" is unconfigured, resulting in the
default "0" level being used. Although this means that the new bundle's start
level will be configured at level 60 (as configured in the
"karaf.startlevel.bundle" property), another unwanted side effect is also
observed : there is no wait in method "DirectoryWatcher:run()".
Solutions :
To avoid such race conditions between the starting of Camel-core bundle and an
application bundle, it would be safer to explicitly configure the property
"felix.fileinstall.start.level" to 60 in Felix 3.1.*, or property
"felix.fileinstall.active.level" to 60 in Felix 3.2.*, or change the code of
DirectoryWatcher to retrieve the default start level, in case it is unspecified
in the properties.
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