Problems accessing datasource in Karaf 4 from Apache Camel - apache-camel

Question

I've created a datasource in Karaf 4 (ServiceMix 7) that works from the karaf console - I can list tables, execute queries and so on.
My issue is when I try to use it from my Camel route.
Excerpt from my blueprint:
...
<reference filter="(osgi.jndi.service.name=jdbc/erp)" id="erpDataSource" interface="javax.sql.DataSource"/>
...
<to id="erpSelectQuery" uri="jdbc:erpDataSource"/>
...
It finds my dataSource but the blueprint can't start due to:
"java.lang.IllegalArgumentException: connectionFactory must be specified"
My datasource was created using:
jdbc:ds-create -dbName erp -dt DataSource -dn mysql -u erp -dc com.mysql.jdbc.Driver -p pre jdbc/erp
I'm at loss here

Answer 1

I have never done it via the jdbc command syntax I followed the guides from the Ops4J Wiki On Datasource creation which I like for one reason alone, this method creates a simple text file that can be administered by not just a Java developer, i.e. it is easier to modify and troubleshoot.
For the sake of not subjecting my answer to link rot I will just outline the procedure here.
Create a datasource configuration file(simple text file) in /servicemixhome/etc with the following naming convention org.ops4j.datasource-give_your_datasource_a_name.cfg .
In the config file configure the appropriate settings an example of mine looks like this:
osgi.jdbc.driver.class = com.mysql.jdbc.Driver
databaseName=dhData
user=foo
url=jdbc:mysql://192.199.199.199:3306/dhData
password=somepassword
dataSourceName=myDSName
Make sure you installed the ops4j required features:
feature:install pax-jdbc-mysql pax-jdbc-config
Now list the datasources using the following syntax:
karaf#root()> service:list javax.sql.DataSource
This will echo something like the list below back.
[javax.sql.DataSource]
----------------------
osgi.jdbc.driver.class = com.mysql.jdbc.Driver
databaseName=dhData
user=foo
url=jdbc:mysql://192.199.199.199:3306/dhData
password=somepassword
dataSourceName=myDSName
Provided by :
OPS4J Pax JDBC Config (216)
At this point you can reference the datasource usign an osgi filter in the blueprint.xml with the following syntax:
<reference filter="(&(objectClass=javax.sql.DataSource)(dataSourceName=myDSName ))" id="myData" interface="javax.sql.DataSource"/>
Then to reference this as property of a bean for example you could do the following:
<bean class="foo.bar" id="ImsCbrEventsBean">
<property name="dataSource" ref="myData"/>
</bean>
Keep in mind this creates a singular connection to a database and you should really create a connection pool.
This can be done by installing the pax-jdbc-pool-dbcp2 feature or any of the other connection pools but use only one at a time, then modifying the datasource config file to carry appropriate information like the example below:
osgi.jdbc.driver.name = mysql
databaseName=dhData
user=foo
url=jdbc:mysql://192.199.199.199:3306/dhData
password=somepassword
dataSourceName=myDSName
jdbc.pool.maxTotal=32
jdbc.pool.blockWhenExhausted=true
jdbc.pool.lifo=false
jdbc.pool.maxIdle=24
jdbc.pool.maxWaitMillis=5000
jdbc.pool.minEvictableIdleTimeMillis=1800000
jdbc.pool.minIdle=16
jdbc.pool.numTestsPerEvictionRun=3
jdbc.pool.softMinEvictableIdleTimeMillis=-1
jdbc.pool.testOnBorrow=true
jdbc.pool.testOnCreate=true
jdbc.pool.testOnReturn=true
jdbc.pool.testWhileIdle=true
jdbc.pool.timeBetweenEvictionRunsMillis=3600000