sure:
this is the pom.xml for the maven-jdbc-plugin...notice there are not dependencies for a database driver in the plugin pom itself. <project> <modelVersion>4.0.0</modelVersion> <parent> <artifactId>mojo</artifactId> <groupId>org.apache.maven.plugins</groupId> <version>1.0.1</version> </parent> <artifactId>maven-jdbc-plugin</artifactId> <version>0.1-SNAPSHOT</version> <packaging>maven-plugin</packaging> <name>Maven JDBC Plugin</name> <inceptionYear>2005</inceptionYear> <dependencies> <dependency> <groupId>org.apache.maven</groupId> <artifactId>maven-project</artifactId> <version>2.0-beta-1-SNAPSHOT</version> </dependency> <dependency> <groupId>plexus</groupId> <artifactId>plexus-utils</artifactId> <version>1.0.1-SNAPSHOT</version> </dependency> </dependencies> </project> and here is the pom.xml for something that is using the plugin: <project> <modelVersion>4.0.0</modelVersion> <groupId>g</groupId> <artifactId>g-db</artifactId> <packaging>jar</packaging> <version>1.0</version> <name>g - db plugin playground</name> <parent> <groupId>g</groupId> <artifactId>g</artifactId> <version>1.0</version> </parent> <dependencies> <dependency> <groupId>oracle</groupId> <artifactId>oracle</artifactId> <version>9201</version> <scope>compile</scope> </dependency> <dependency> <groupId>oracle</groupId> <artifactId>oracle_nls_charset</artifactId> <version>9201.12</version> <scope>compile</scope> </dependency> </dependencies> <build> <extensions> <extension> <artifactId>oracle</artifactId> <groupId>oracle</groupId> <version>9201</version> </extension> <extension> <artifactId>oracle_nls_charset</artifactId> <groupId>oracle</groupId> <version>9201.12</version> </extension> </extensions> <plugins> <plugin> <artifactId>maven-jdbc-plugin</artifactId> <version>1.0-SNAPSHOT</version> <configuration> <driver>oracle.jdbc.driver.OracleDriver</driver> <url>jdbc:oracle:thin:@host:1790:DB</url> <username>user</username> <password>password</password> <statement>select * from whatever</statement> </configuration> </plugin> </plugins> </build> </project> now, the <dependency> entries would in available to compile against for sources that might be in this subproject..but they would not be available to the plugin execution classpath. But with the <extensions> mechanism the plugin would be able to find the oracle.jdbc.driver.OracleDriver class since those extensions are inserted into the plugin exec classpath in a nutshell it can boil down to extensions let you insert an artifact into the classpath of a plugin when it executes that clear it up further? jesse On 9/22/05, dohadwala, moiz <[EMAIL PROTECTED]> wrote: > > Jesse, > > Thanks for the explanation. To make it clearer, can you show me what the > extension tag would look like in this case? > > Thanks, > > -Moiz > > -----Original Message----- > From: Jesse McConnell [mailto:[EMAIL PROTECTED] > Sent: Thursday, September 22, 2005 7:25 AM > To: Maven Users List > Subject: Re: [m2] project descriptor tags > > I can give you a use case where you would need extensions. > > there is a jdbc plugin that lets you execute whatever sql you want when > you > execute the plugin. But the way the plugin was built you can't just > declare > every database driver as a dependency of the plugin...that would mean > people > would need to download oracle drivers and install them just to use mysql.. > > so you use extensions so that you can insert the database driver code at > runtime of the plugin.. > > does that case clear up what extensions can be used for? > > jesse > > On 9/22/05, dohadwala, moiz <[EMAIL PROTECTED]> wrote: > > > > I am new to maven and have decided to take the plunge with m2. I have > > trying to understand the pom.xml tags. I don't understand the purpose > > of the extension tag. The description on > > http://maven.apache.org/maven2/maven-model/maven.html#class_Extension > > <http://maven.apache.org/maven2/maven-model/maven.html#class_Extension > > > > > isn't too clear. > > > > Is there any other location I can use for reference? > > > > -Moiz > > > > > > > > > > > -- > jesse mcconnell > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- jesse mcconnell
