running webapp (war) in a multiproject environment

[Carsten Krebs <ca...@gameduell.de>]

Hi,

I'm trying to run a maven build war file using one of the container plugins (cargo, tomcat or jetty). While this works fine in single project setup, I don't know how to get it properly work in multi project setup, if I have dependencies from the war module to at least on other child project. The multiproject setup I'm using is similar to the following (pom file are below):

parent (pom) / child1 (jar)
             / child2 (war)

where the child2 module depends on the module child1.
Building and packaging all modules from the top-level project works fine, but starting the webapp (child2.war) is not possible. Running a "mvn tomcat:run" from inside of module "child2" results in the following error:

[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'tomcat'.
[INFO] ----------------------------------------------------------------------------
[INFO] Building Unnamed - example:child2:war:1.0-SNAPSHOT
[INFO]    task-segment: [tomcat:run]
[INFO] ----------------------------------------------------------------------------
[INFO] Preparing tomcat:run
[INFO] [resources:resources]
[INFO] Using default encoding to copy filtered resources.
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Failed to resolve artifact.

Missing:
----------
1) example:child1:jar:1.0-SNAPSHOT

  Try downloading the file manually from the project website.

  Then, install it using the command: 
      mvn install:install-file -DgroupId=example -DartifactId=child1 \
          -Dversion=1.0-SNAPSHOT -Dpackaging=jar -Dfile=/path/to/file

  Path to dependency: 
        1) example:child2:war:1.0-SNAPSHOT
        2) example:child1:jar:1.0-SNAPSHOT

----------
1 required artifact is missing.

for artifact: 
  example:child2:war:1.0-SNAPSHOT


As far I understand maven, this error is comprehensible, because when running maven from inside of the child module, maven doesn't know how to build the child1 dependency. So I would think, that running "mvn tomcat:run" from inside of the top-level module would be more appropriate. But this isn't possible, too, because the top-level module doesn't know anything about  the maven-tomcat-plugin. For sure, I can solve this problem, by running a "mvn install" first, go into the child2 module and run a "mvn tomcat:run". This seems to me a little bit too complicated.
So I wonder if there something wrong with my project setup or if there is better way to run the webapp using maven?


Carsten


===

top-level module
----------------
<?xml version="1.0" encoding="UTF-8"?>
<project>
	<modelVersion>4.0.0</modelVersion>
	<groupId>example</groupId>
	<artifactId>parent</artifactId>
	<packaging>pom</packaging>
	<version>1.0-SNAPSHOT</version>
	<modules>
		<module>child1</module>
		<module>child2</module>
	</modules>
	<properties>
		<example.version>${project.version}</example.version>
	</properties>
</project>


child1
------
<?xml version="1.0" encoding="UTF-8"?>
<project>
	<parent>
		<groupId>example</groupId>
		<artifactId>parent</artifactId>
		<version>1.0-SNAPSHOT</version>
	</parent>
	<modelVersion>4.0.0</modelVersion>
	<groupId>example</groupId>
	<artifactId>child1</artifactId>
	<packaging>jar</packaging>
</project>

child2
------
<?xml version="1.0" encoding="UTF-8"?>
<project>
	<parent>
		<groupId>example</groupId>
		<artifactId>parent</artifactId>
		<version>1.0-SNAPSHOT</version>
	</parent>
	<modelVersion>4.0.0</modelVersion>
	<groupId>example</groupId>
	<artifactId>child2</artifactId>
	<packaging>war</packaging>
	<build>
		<plugins>
			<plugin>
				<groupId>org.codehaus.mojo</groupId>
				<artifactId>tomcat-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.codehaus.cargo</groupId>
				<artifactId>cargo-maven2-plugin</artifactId>
				<configuration>
					<container>
						<containerId>tomcat5x</containerId>
						<home>/opt/apache-tomcat-5.5.17</home>
					</container>
				</configuration>
			</plugin>
		</plugins>
	</build>
	<dependencies>
		<dependency>
			<groupId>example</groupId>
			<artifactId>child1</artifactId>
			<version>${example.version}</version>
		</dependency>
	</dependencies>
</project>



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