What dependency scope for Derby JDBC drivers in intergration scope (cayenne) - maven

Question

I am trying to build my pom.xml so that I can automatically create my database schema when running 'mvn install'. I'm using the "maven-cayenne-plugin" to do this. This is plugin is being called (at the integration-test phase), as I can see the output. But the mojo fails with the exception: (I used the -e and -X flag to see this).
java.lang.ClassNotFoundException: org.apache.derby.jdbc.ClientDriver
(I get the same if I try and use the EmbeddedDriver and whether or not I include 'derbyclient' or simply 'derby' as my dependency).
Here's a pom.xml that should replicate the issue.
I'm using MVN 3 on Windows.
[ Apache Maven 3.0.4 (r1232337; 2012-01-17 08:44:56+0000) ]
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany</groupId>
<artifactId>myproject</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<groupId>org.apache.cayenne.plugins</groupId>
<artifactId>maven-cayenne-modeler-plugin</artifactId>
<version>3.2M1</version>
</plugin>
<plugin>
<groupId>org.apache.cayenne.plugins</groupId>
<artifactId>maven-cayenne-plugin</artifactId>
<version>3.2M1</version>
<executions>
<execution>
<id>cgen</id>
<configuration>
<superPkg>com.mycompany.model.generated</superPkg>
<map>${project.build.sourceDirectory}/../resources/datamap.map.xml</map>
<destDir>${project.build.sourceDirectory}</destDir>
</configuration>
<goals>
<goal>cgen</goal>
</goals>
</execution>
<execution>
<id>cdbgen</id>
<configuration>
<map>${project.build.sourceDirectory}/../resources/datamap.map.xml</map>
<driver>org.apache.derby.jdbc.ClientDriver</driver>
<url>jdbc:derby:memory:tracedb;create=true</url>
<username>test</username>
</configuration>
<goals>
<goal>cdbgen</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbyclient</artifactId>
<version>10.10.1.1</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>
This also requires a valid cayenne "datamap.map.xml" file (in src/main/resources), here's one I made earlier:
<?xml version="1.0" encoding="utf-8"?>
<data-map xmlns="http://cayenne.apache.org/schema/3.0/modelMap"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://cayenne.apache.org/schema/3.0/modelMap http://cayenne.apache.org/schema/3.0/modelMap.xsd"
project-version="6">
<db-entity name="TEST">
<db-attribute name="ID" type="INTEGER" isPrimaryKey="true" isMandatory="true"/>
</db-entity>
</data-map>
EDIT:
Adding more information.
The derbyclient-10.10.1.1.jar does contain the class 'org.apache.derby.jdbc.ClientDriver' (just expanded the JAR from Netbeans).
The -X flag seems to show that the CLASSPATH is correctly referencing the JAR:
[DEBUG] (f) classpathElements = [<PROJECT-PATH>\mvn\target\classes, <HOME-DIR>\.m2\repository\org\apache\derby\derbyclient\10.10.1.1\derbyclient-10.10.1.1.jar]
SOLUTION:working pom.xml (see answer and my comment):
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany</groupId>
<artifactId>myproject</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<groupId>org.apache.cayenne.plugins</groupId>
<artifactId>maven-cayenne-modeler-plugin</artifactId>
<version>3.2M1</version>
</plugin>
<plugin>
<groupId>org.apache.cayenne.plugins</groupId>
<artifactId>maven-cayenne-plugin</artifactId>
<version>3.2M1</version>
<dependencies>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<version>10.10.1.1</version>
</dependency>
</dependencies>
<executions>
<execution>
<id>cgen</id>
<configuration>
<superPkg>com.mycompany.model.generated</superPkg>
<map>${project.build.sourceDirectory}/../resources/datamap.map.xml</map>
<destDir>${project.build.sourceDirectory}</destDir>
</configuration>
<goals>
<goal>cgen</goal>
</goals>
</execution>
<execution>
<id>cdbgen</id>
<configuration>
<map>${project.build.sourceDirectory}/../resources/datamap.map.xml</map>
<driver>org.apache.derby.jdbc.EmbeddedDriver</driver>
<url>jdbc:derby:memory:tracedb;create=true</url>
<username>test</username>
</configuration>
<goals>
<goal>cdbgen</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbyclient</artifactId>
<version>10.10.1.1</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>

Answer 1

To ensure that the Derby driver is available during plugin execution (vs during your code compilation), you need to add it as a dependency of the plugin itself:
<plugin>
<groupId>org.apache.cayenne.plugins</groupId>
<artifactId>maven-cayenne-plugin</artifactId>
<version>3.2M1</version>
<dependencies>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbyclient</artifactId>
<version>10.10.1.1</version>
</dependency>
</dependencies>
....
</plugin>