I am working on a project where I use a camel route (Camel-sql) to fetch data from a MariaDB database. I use apache commons dbcp2 as a Datasource in my blueprint file. It works perfectly fine when I use mvn:camel-run to run the project in development.
The problem starts when I try to deploy this project on Karaf. mvn:install generates the required jar with blueprint files and manifest file correctly formed. I copy this over to the deploy folder in Karaf.
The bundle installation is successful. But it does not start. I get an exception saying that the bundle was not able to detect the MariaDB java client. This does not make sense to me because I have it installed (using bundle:install -s mvn:...) on Karaf. I did this for all other dependencies like fasterxml, dbcp2 etc.
My requirement is strict: I need to be able to define the data source in my blueprint file. I have found some solutions about using pax-jdbc but did not get anything clear as of yet. Attaching all relevant hints below.
Exception trace
17:39:01.404 WARN [Camel (dbOps-context-g3) thread #10 - timer://foo] Error processing exchange. Exchange[AA8CB8C488B457B-0000000000000005]. Caused by: [org.springframework.jdbc.CannotGetJdbcConnectionException - Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Cannot load JDBC driver class 'org.mariadb.jdbc.Driver']
org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Cannot load JDBC driver class 'org.mariadb.jdbc.Driver'
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:83) ~[!/:?]
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:646) ~[!/:?]
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:685) ~[!/:?]
at org.apache.camel.component.sql.SqlProducer.processInternal(SqlProducer.java:145) ~[!/:3.19.0]
at org.apache.camel.component.sql.SqlProducer.process(SqlProducer.java:132) ~[!/:3.19.0]
at org.apache.camel.support.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:66) ~[?:?]
at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:172) ~[?:?]
at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$SimpleTask.run(RedeliveryErrorHandler.java:477) ~[?:?]
at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:181) ~[?:?]
at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:59) ~[?:?]
at org.apache.camel.processor.Pipeline.process(Pipeline.java:175) ~[?:?]
at org.apache.camel.impl.engine.CamelInternalProcessor.process(CamelInternalProcessor.java:392) ~[?:?]
at org.apache.camel.component.timer.TimerConsumer.sendTimerExchange(TimerConsumer.java:210) ~[?:?]
at org.apache.camel.component.timer.TimerConsumer$1.run(TimerConsumer.java:76) ~[?:?]
at java.util.TimerThread.mainLoop(Timer.java:556) ~[?:?]
at java.util.TimerThread.run(Timer.java:506) ~[?:?]
Caused by: java.sql.SQLException: Cannot load JDBC driver class 'org.mariadb.jdbc.Driver'
at org.apache.commons.dbcp2.DriverFactory.createDriver(DriverFactory.java:54) ~[!/:2.9.0]
at org.apache.commons.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:459) ~[!/:2.9.0]
at org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:525) ~[!/:2.9.0]
at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:731) ~[!/:2.9.0]
at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:159) ~[!/:?]
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:117) ~[!/:?]
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) ~[!/:?]
... 15 more
Karaf Bundles list
karaf@root()> bundle:list
START LEVEL 100 , List Threshold: 50
ID │ State │ Lvl │ Version │ Name
────┼──────────┼─────┼────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
32 │ Active │ 80 │ 4.4.1 │ Apache Karaf :: OSGi Services :: Event
59 │ Active │ 50 │ 3.19.0 │ camel-api
60 │ Active │ 50 │ 3.19.0 │ camel-base
61 │ Active │ 50 │ 3.19.0 │ camel-base-engine
62 │ Active │ 50 │ 3.19.0 │ camel-bean
63 │ Active │ 50 │ 3.19.0 │ camel-browse
64 │ Active │ 50 │ 3.19.0 │ camel-cloud
65 │ Active │ 50 │ 3.19.0 │ camel-cluster
66 │ Active │ 50 │ 3.19.0 │ camel-console
67 │ Active │ 50 │ 3.19.0 │ camel-controlbus
68 │ Active │ 50 │ 3.19.0 │ camel-core-catalog
69 │ Active │ 50 │ 3.19.0 │ camel-core-engine
70 │ Active │ 50 │ 3.19.0 │ camel-core-languages
71 │ Active │ 50 │ 3.19.0 │ camel-core-model
72 │ Active │ 50 │ 3.19.0 │ camel-core-processor
73 │ Active │ 50 │ 3.19.0 │ camel-core-reifier
74 │ Active │ 50 │ 3.19.0 │ camel-core-xml
75 │ Active │ 50 │ 3.19.0 │ camel-dataformat
76 │ Active │ 50 │ 3.19.0 │ camel-dataset
77 │ Active │ 50 │ 3.19.0 │ camel-direct
78 │ Active │ 50 │ 3.19.0 │ camel-directvm
79 │ Active │ 50 │ 3.19.0 │ camel-file
80 │ Active │ 50 │ 3.19.0 │ camel-health
81 │ Active │ 50 │ 3.19.0 │ camel-language
82 │ Active │ 50 │ 3.19.0 │ camel-log
83 │ Active │ 50 │ 3.19.0 │ camel-main
84 │ Active │ 50 │ 3.19.0 │ camel-management
85 │ Active │ 50 │ 3.19.0 │ camel-management-api
86 │ Active │ 50 │ 3.19.0 │ camel-mock
87 │ Active │ 50 │ 3.19.0 │ camel-ref
88 │ Active │ 50 │ 3.19.0 │ camel-rest
89 │ Active │ 50 │ 3.19.0 │ camel-saga
90 │ Active │ 50 │ 3.19.0 │ camel-scheduler
91 │ Active │ 50 │ 3.19.0 │ camel-seda
92 │ Active │ 50 │ 3.19.0 │ camel-stub
93 │ Active │ 50 │ 3.19.0 │ camel-support
94 │ Active │ 50 │ 3.19.0 │ camel-timer
95 │ Active │ 50 │ 3.19.0 │ camel-tooling-model
96 │ Active │ 50 │ 3.19.0 │ camel-util
97 │ Active │ 50 │ 3.19.0 │ camel-util-json
98 │ Active │ 50 │ 3.19.0 │ camel-validator
99 │ Active │ 50 │ 3.19.0 │ camel-vm
100 │ Active │ 50 │ 3.19.0 │ camel-xml-io-util
101 │ Active │ 50 │ 3.19.0 │ camel-xml-jaxb
102 │ Active │ 50 │ 3.19.0 │ camel-xml-jaxp
103 │ Active │ 50 │ 3.19.0 │ camel-xpath
104 │ Active │ 50 │ 3.19.0 │ camel-xslt
105 │ Active │ 50 │ 3.19.0 │ camel-blueprint
106 │ Active │ 80 │ 3.19.0 │ camel-commands-core
107 │ Active │ 50 │ 3.19.0 │ camel-core-osgi
108 │ Active │ 80 │ 3.19.0 │ camel-karaf-commands
120 │ Active │ 50 │ 3.1.1.SNAPSHOT │ com.github.ben-manes.caffeine
121 │ Active │ 50 │ 3.19.0 │ camel-sql
146 │ Active │ 80 │ 2.13.0 │ Jackson-annotations
147 │ Active │ 80 │ 2.13.0 │ Jackson-core
148 │ Active │ 80 │ 2.13.0 │ jackson-databind
155 │ Active │ 80 │ 2.9.0 │ Apache Commons DBCP
156 │ Active │ 80 │ 2.9.0 │ Apache Commons Pool
159 │ Active │ 50 │ 3.19.0 │ camel-paho
160 │ Active │ 50 │ 1.2.5 │ org.eclipse.paho.client.mqttv3
177 │ Resolved │ 80 │ 1.0.0.SNAPSHOT │ camel-jdbc-to-mqtt
Data source section from blueprint.xml
<bean id="dataSourceBean" destroy-method="close">
<property name="driverClassName" value="org.mariadb.jdbc.Driver"/>
<property name="url" value="jdbc:mariadb://localhost:3306/test-db"/>
<property name="username" value="demouser"/>
<property name="password" value="1demo1"/>
</bean>
Dependencies and plugins from POM
<dependencyManagement>
<dependencies>
<!-- Camel BOM -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-bom</artifactId>
<version>3.19.0</version>
<scope>import</scope>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.camel.karaf</groupId>
<artifactId>camel-karaf-bom</artifactId>
<version>3.19.0</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- DB connectivity -->
<dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>
<version>3.0.8</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
<version>2.9.0</version>
</dependency>
<!-- Camel -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-sql</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel.karaf</groupId>
<artifactId>camel-blueprint</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel.karaf</groupId>
<artifactId>camel-blueprint-main</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-paho</artifactId>
</dependency>
<!-- Testing -->
<dependency>
<groupId>org.apache.camel.karaf</groupId>
<artifactId>camel-test-blueprint</artifactId>
<scope>test</scope>
</dependency>
<!-- logging -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<scope>runtime</scope>
</dependency>
<!-- JSON processing -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.13.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- compiler plugin -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.10.1</version>
<configuration>
<release>11</release>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<!-- to generate the MANIFEST.MF of the bundle -->
<plugin>
<groupId>org.apache.camel</groupId>
<artifactId>camel-bundle-plugin</artifactId>
<version>3.19.0</version>
<extensions>false</extensions>
<executions>
<execution>
<id>bundle-manifest</id>
<phase>prepare-package</phase>
<goals>
<goal>manifest</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- to include MANIFEST.MF in the bundle -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<archive>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
</configuration>
</plugin>
<!-- to run the example using mvn camel-karaf:run -->
<plugin>
<groupId>org.apache.camel.karaf</groupId>
<artifactId>camel-karaf-maven-plugin</artifactId>
<version>3.19.0</version>
</plugin>
</plugins>
</build>
CodePudding user response：
You need to install the driver inside karaf, the reason your route do not start up is because does not find the driver for your data source.
Install the driver like
bundle:install -s mvn:org.mariadb.jdbc/mariadb-java-client:3.0.8
Then enable the resulting bundle as dynamic import like
bundle:dynamic-import ${bundleId}
May be it should be necessary to enable dynamic import to your route.
Then restart your route and it should work!
hope this helps