everis everis - 2 months ago 18
Java Question

Bundle in Karaf using wrong pax-jdbc DataSource

We have different OSGi bundles loaded in Karaf 4.0.3 and multiple

javax.sql.DataSource
loaded by
pax-jdbc-config
. For example, there are configured two datasources to different databases:

karaf@root()> service:list DataSource
[javax.sql.DataSource]
----------------------
dataSourceName = datasourceA
felix.fileinstall.filename = file:/opt/karaf/etc/org.ops4j.datasource-dba.cfg
osgi.jdbc.driver.name = mysql-pool
osgi.jndi.service.name = datasourceA
password = secretpassword
service.bundleid = 207
service.factoryPid = org.ops4j.datasource
service.id = 276
service.pid = org.ops4j.datasource.2ab06071-d3fa-4d7e-b508-19f36892cb7e
service.scope = singleton
url = jdbc:mysql://mysql.example.com/dba
user = dbuser
Provided by :
OPS4J Pax JDBC Config (207)
Used by:
MODULE B (29)

[javax.sql.DataSource]
----------------------
dataSourceName = datasourceB
felix.fileinstall.filename = file:/opt/karaf/etc/org.ops4j.datasource-dbb.cfg
osgi.jdbc.driver.name = PostgreSQL JDBC Driver-pool
osgi.jndi.service.name = datasourceB
password = secretpassword
service.bundleid = 207
service.factoryPid = org.ops4j.datasource
service.id = 278
service.pid = org.ops4j.datasource.a7b84423-a605-4010-9806-db7bcc0bccd4
service.scope = singleton
url = jdbc:postgresql://postgresql.example.com/dbb
user = dbuser
Provided by :
OPS4J Pax JDBC Config (207)


My problem is that bundle MODULE B should use datasourceB. It is configured to use datasourceB in all source files and in blueprint.xml

...
<reference id="datasourceB" interface="javax.sql.DataSource"/>
...


I really don't understand, how easily can karaf bundles use different DataSource.

And when datasourceA config file is removed, then MODULE B correctly use datasourceB.

Is this issue about wrong order of config files or something?

EDIT :

I have found out that when I remove datasourceA config file and therefore Karaf removes that DataSource (not present in
service:list DataSource
), MODULE B correctly uses datasourceB.

But I still don't know why is this happening. Did I missed read some documentation about this? Is it
pax-jdbc-config
issue or Karaf issue?

Answer

When you reference the datasource, you can use a filter to indicate wich one you want :

<reference id="datasourceB" interface="javax.sql.DataSource" filter="(dataSourceName=datasourceB)" />
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