Hi, There only ever is one 'pom.xml' per project. The project structure below really shows all essential file needed.
I suggest you set up a simple test project up-to the point where you can successfully compile and package it and then venture on from this starting point. The test project would have one 'pom.xml' in it's root directory and a 'src/main/java' directory containing the java classes and packages. Once you have that up and running you can extend you example like described in Point III. from my last mail. What you will have then is a working multi-module project (I don't know if that's the official term but it's what I'm calling it). And again like in the example for the simple (one-module) project all relevant files are shown in my last mail. One point I think you are confused with is the difference between a multi-module (aggregation) project and pom inheritance (parent pom). In a multi-module project there is no parent pom involved per se. You just have a set of (concrete) projects where the actual code is compiled and one or more aggregation projects (with a packaging of type pom) that _aggregate_ the build of the concrete projects via the <modules/> tag in the pom. No parent poms involved here. A parent pom is something analogue to a superclass in java it captures portions of common configuration. For example if you have multiple projects depending on the same library, you could create a parent pom which declares that library as a dependency and let all projects needing that library inherit from the parent pom via the <parent/> tag. -Tim Am Montag, den 23.04.2007, 18:40 +0530 schrieb Ramesh Babu Pokala - TLS, Chennai: > Thanks for your response. > I am following the following structure as u mentioned > > my-app > |-- pom.xml > `-- src > -- main > `-- java > `-- package1 > `-- package2 > `-- package3 > | `-- App.java > `-- package4 > `-- MyClass.java > > > Then what should be my parent POM.xml? > How many poms I need. Do I need poms for package3 as well as package4 > along with main pom? > ` > > Thanks & Regards > Ramesh Babu.P > > -----Original Message----- > From: Tim Kettler [mailto:[EMAIL PROTECTED] > Sent: Saturday, April 21, 2007 11:42 PM > To: Maven Users List > Subject: Re: Problem in packaging multiple directories > > Hi, > > I. Maven Directory Layout > > If you follow the 'Getting Started Guide' you should have a directory > structure like the one below: > > my-app > |-- pom.xml > `-- src > |-- main > | `-- java > | `-- package1 > | `-- package2 > | `-- package3 > | | `-- App.java > | `-- package4 > | `-- MyClass.java > `-- test > `-- java > `-- packakag1 > `-- package2 > `-- package3 > `-- AppTest.java > > This is the default layout maven expects. If you are not converting from > a legacy project and absolutely need a different directory layout you > should stick to this default. That will save you from much hassle. > > If you really can't follow that proposed structure, you have to override > the maven default values in the pom (see [1], [2] and [3] for a complete > description of the pom). > > For example, to override the default source directory you would have > something like this in your pom: > > <project> > ... > <build> > > <sourceDirectory>my/non/standard/source/directory</sourceDirectory> > ... > </build> > ... > </project> > > > II. Multiple Source Directories Per Project > > Maven has a one-set-of-sources-per-project philosophy so if you really > need multiple source directories you are somewhat working against the > spirit of maven. Instead you should organize your project in multiple > modules (see below) and make them depend on each other. > > If you really need to have more than one set of sources in a single > project you can attach an additional source directory using the > build-helper-maven-plugin [4]. > > > III. Multi-Module Projects > > Multi-Module projects are a set of maven projects (logical!!, not > necessarily physical on disk) organized as a tree. The nodes in the > logical tree are projects with a packaging of type pom with the leaves > of the tree containing the projects where you actual build your > artifacts (jar, war, ...). > > A typical layout could look like this: > > my-app > |-- pom.xml > |-- subproject1 > | |-- pom.xml > | `-- src > | `-- main > | `-- java > | `-- package1 > | `-- package2 > | `-- package3 > | `-- App.java > `-- subproject1 > |-- pom.xml > `-- src > `-- main > `-- java > `-- package1 > `-- package2 > `-- UtilityClass.java > > The content of the poms would then look like this: > > my-app/pom.xml: > > <project> > <groupId>com.mycompany.app</groupId> > <version>1.0-SNAPSHOT</version> > <artifactId>app</artifactId> > > <packaging>pom</packaging> > > <modules> > <module>subproject1</module> > <module>subproject2</module> > </modules> > </project> > > subproject1/pom.xml: > > <project> > <groupId>com.mycompany.app</groupId> > <artifactId>subproject1</artifactId> > <version>1.0-SNAPSHOT</version> > > <packaging>jar</packaging> > > <dependencies> > <dependency> > <groupId>com.mycompany.app</groupId> > <artifactId>subproject1</artifactId> > <version>1.0-SNAPSHOT</version> > </dependency> > </dependencies> > </project> > > subproject2/pom.xml: > > <project> > <groupId>com.mycompany.app</groupId> > <artifactId>subproject2</artifactId> > <version>1.0-SNAPSHOT</version> > > <packaging>jar</packaging> > </project> > > > > Hope this gets you started > -Tim > > [1] > http://maven.apache.org/guides/introduction/introduction-to-the-pom.html > [2] http://maven.apache.org/pom.html > [3] http://maven.apache.org/ref/current/maven-model/maven.html > [4] http://mojo.codehaus.org/build-helper-maven-plugin/howto.html > > > > Am Samstag, den 21.04.2007, 20:42 +0530 schrieb Ramesh Babu Pokala - > TLS, Chennai: > > Hi, > > I was unable to compile multi directory project... I tried in > > different ways (follwed from maven - getting started site) but still > > did not get the solution. > > > > I have directory structure like > > > > > > abc > > | > > |___________src > > | > > |_____xxx > > | > > |______yyy > > | > > |_____zzz > > | > > > > |________aaa --> java files > > | > > > > |________bbb --> java files > > | > > > > |________ccc --> java files > > > > > > Now i want to compile sources in all the packages xxx.yyy.zzz.aaa, > > xxx.yyy.zzz.bbb and xxx.yyy.zzz.ccc. > > > > > > Tries...... > > > > 1) Having only one POM in abc directory and packaging as jar..... > > > > <project> > > : > > : > > <modelVersion>4.0.0</modelVersion> > > > > <groupId>xxx.yyy.zzz</groupId> > > > > <artifactId>abc</artifactId> > > > > <packaging>jar</packaging> > > > > : > > > > </project> > > > > Note: I did not mention sub packages aaa, bbb and ccc as modules in > the > > pom. > > > > Output : no sources to compile > > > > > > 2) Having Parent pom in abc and having separate poms in each and every > > > package aaa,bb and ccc > > > > parent pom: mentioned packaging as pom, also mentioned modules > > > > <project> > > : > > : > > <modelVersion>4.0.0</modelVersion> > > > > <groupId>xxx.yyy.zzz</groupId> > > > > <artifactId>abc</artifactId> > > > > <packaging>pom</packaging> > > > > : > > > > <modules> > > > > <module>xxx.yyy.zzz.aaa</module> > > > > <module>xxx.yyy.zzz.bbb</module> > > > > <module>xxx.yyy.zzz.ccc</module> > > > > </modules> > > > > </project> > > > > > > Now i have child poms like > > > > : > > : > > <parent> > > > > <groupId>xxx.yyy.zzz</groupId> > > > > <artifactId>abc</artifactId> > > > > </parent> > > > > <modelVersion>4.0.0</modelVersion> > > > > <groupId>xxx.yyy.zzz.aaa</groupId> > > > > <artifactId>aaa</artifactId> > > > > <packaging>jar</packaging> > > > > <name>aaa package</name> > > > > : > > > > : > > > > > > > > Output : > > > > > > [INFO] Scanning for projects... > > [INFO] > > ---------------------------------------------------------------------- > > -- > > [ERROR] FATAL ERROR > > [INFO] > > ---------------------------------------------------------------------- > > -- [INFO] Error building POM (may not be this project's POM). > > > > > > Project ID: unknown > > > > Reason: Could not find the model file 'C:\Documents and > > Settings\bpra\Desktop\SampleRCP\abc\xxx.yyy.zzz. > > .aaa\pom.xml'. > > > > > > Do I need to have pom in each of the packages aaa, bbb and ccc? > > what is the problem? > > > > Can anyone please help me out? > > > > > > > > Thanks you > > > > Ramesh > > > > > > > > DISCLAIMER: > > ---------------------------------------------------------------------- > > ------------------------------------------------- > > > > The contents of this e-mail and any attachment(s) are confidential and > intended for the named recipient(s) only. > > It shall not attach any liability on the originator or HCL or its > > affiliates. 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