I have two distinct complex build task which must be done sequentially by maven. For example creating war files, library and ...
As far as I know, I have to split these tasks into separate maven pom files. By this approach, each pom file has a specific responsibility, I can keep them as simple as possible and above all, as a result of some technical issues, I have to do this.
I put shared dependencies between these two files in a parent pom file to reduce duplication. In this case create-jar.xml and create-war.xml are tasks and parent.xml contains shared dependencies.
parent.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
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>main</groupId>
<artifactId>main</artifactId>
<version>1.0</version>
<packaging>pom</packaging>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.13</version>
</dependency>
</dependencies>
</project>
create-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
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>
<parent>
<artifactId>main</artifactId>
<groupId>main</groupId>
<version>1.0</version>
<relativePath>parent.xml</relativePath>
</parent>
<groupId>create</groupId>
<artifactId>create</artifactId>
<version>1.2-SNAPSHOT</version>
<packaging>jar</packaging>
</project>
create-war.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
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>
<parent>
<artifactId>main</artifactId>
<groupId>main</groupId>
<version>1.0</version>
<relativePath>parent.xml</relativePath>
</parent>
<groupId>create-war</groupId>
<artifactId>create-war</artifactId>
<version>1.1-SNAPSHOT</version>
<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
</configuration>
</plugin>
</plugins>
</build>
</project>
What I need is to call mvn install of both pom files by one command. The Order is really important for me as create-jar must run before create-war.
There are two approaches.
First inheritance, By using create-jar.xml as a direct parent of create-war.xml, therefore by running create-war, create-jar is called.
The other solution is composition by running create-jar.xml from create-war.xml. I'm not sure how can I do that. But I think maven-invoker or maven-antRun plugins can be helpful.
I'd be happy to give me a hand.
Check this sample project.
Basically you will need a parent pom which will call your 2 child poms.
The above example is a bit long but they will explain each and every step in layman's term.
Related
I have a dependency called "general-lib" which will be modified and used by 3 teams.
Admin, Child-ABC and Child-XYZ are those 3 projects. Those 3 apps
deployed in same server.
Child-XYZ and Child-ABC are communicating to
Admin app frequently.
When we change general-lib version, I want
that Child apps also should use same version what admin app uses.
Finally that particular dependency version should be managed at super application.
is there any to do that ? Please let me know if I need to explain better.
You can define a BOM (Bills of Materials) where you can move the dependecyManagement for the common artifacts and then declare it as a parent in your 3 projects. This is an example of BOM:
<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>your.group.id</groupId>
<artifactId>whatever-BOM</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<properties>
<general-lib.version>1.0.2</general-lib.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>your.groupid</groupId>
<artifactId>general-lib</artifactId>
<version>${general-lib.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>
For more details on BOM, you can read the article Spring with Maven BOM that even if it's related to Spring, it will explain in a detailed way what are BOMs and how to use them.
Ohter possibility, is to define those 3 projects as a module of a higher level project and manage in this one the dependencyManagement.
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>your.group.id</groupId>
<artifactId>whatever</artifactId>
<version>1.0-SNAPSHOT</version>
<modules>
<module>Admin</module>
<module>Child-ABC</module>
<module>Child-XYZ</module>
</modules>
<packaging>pom</packaging>
<properties>
<general-lib.version>1.0.2</general-lib.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>your.groupid</groupId>
<artifactId>general-lib</artifactId>
<version>${general-lib.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>
I am trying to learn how maven multi-project builds work. I have a very simple setup right now, a top level POM that defines 1 subproject, the web application, and a web project that has a pretty basic pom file. From the parent level directory, when i try to run 'mvn clean install' i get the following error:
Child module /home/jeb/Desktop/payroll/payroll-web> of /home/jeb/Desktop/payroll/pom.xml does not exist
Here is the parent pom:
<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>payroll</groupId>
<artifactId>payroll-top</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>payroll-web></module>
</modules>
</project>
And here is the subproject (web app) pom.xml
<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>
<name>payroll-web</name>
<parent>
<groupId>payroll</groupId>
<artifactId>payroll-top</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<groupId>payroll</groupId>
<artifactId>payroll-web</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
</dependencies>
<build>
<finalName>payrollwebapp</finalName>
</build>
</project>
I'm not sure what I am missing to get the project to build, any help is appreciated.
You have a trailing ">" at the end of the module name.
<module>payroll-web></module>
`<parent>
<groupId>payroll</groupId>
<artifactId>payroll-top</artifactId>
<version>*0.0.1-SNAPSHOT*</version>
<relativePath>../pom.xml</relativePath>
</parent>`
Correct the parent version to 1.0
I would like to have a "dependencies file" to be able to load this file into different maven poms. I have two poms in my project which are similar to some degree. I want the identical configuration in a third pom to be loaded by the working poms.
Is this possible?
e.g. something like:
<project A>
<dependencies>
<file> "depend.xml" </file>
</dependencies>
...
<project B>
<dependencies>
<file> "depend.xml" </file>
</dependencies>
...
You can create a parent POM file, which all your projects inherit. By specifying dependencies, versions, etc. in the parent POM file, you don't need to respecify them in each project (unless you need to override them for whatever reason).
There's more information at: https://www.smartics.eu/confluence/display/BLOG/2013/07/22/Using+Aggregate+and+Parent+POMs
You could create a hierarchical project making A and B a module of a common parent and manage your dependencies there.
Parent
<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>my.package</groupId>
<artifactId>parent</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<name>Parent</name>
<modules>
<module>A</module>
<module>B</module>
</modules>
...
<dependencies>
....
</dependencies>
</project>
A
<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>
<artifactId>A</artifactId>
<packaging>jar</packaging>
<name>A</name>
<parent>
<groupId>my.package</groupId>
<artifactId>parent/artifactId>
<version>1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
Use properties
You can also introduce variables to organize your versions using this pattern.
...
<properties>
<alib.version>4.7</alib.version>
<properties>
...
<dependencies>
<dependency>
<groupId>alib</groupId>
<artifactId>someArtifact</artifactId>
<version>${alib.version}</version>
</dependency>
</dependencies>
I was not used to the concept of "build lifecycle". I thought that I have to have different poms for different tasks. e.g. one for packaging and one for deployment. After I found out that I can assign the plugins execution to specific phases I'm able to get along with only one pom which eliminates my whole question.
I had a multi module application called ParentApp(Which is a parent project) and it has JARMOdule, WARModule, EARModule. EAR Module has dependedncies of JARModule and WARMOdule
ParentPOM
<?xml version="1.0" encoding="UTF-8"?>
<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>ParentApp</groupId>
<artifactId>ParentApp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>JARModule</module>
<module>WARModule</module>
<module>EARModule</module>
</modules>
</project>
EARModule POM
<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>
<parent>
<groupId>ParentApp</groupId>
<artifactId>ParentApp</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>EARModule</artifactId>
<packaging>ear</packaging>
<dependencies>
<dependency>
<groupId>ParentAPP</groupId>
<artifactId>WARModule</artifactId>
<version>0.0.1-SNAPSHOT</version>
<type>war</type>
</dependency>
<dependency>
<groupId>ParentAPP</groupId>
<artifactId>JARModule</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
And respective JAR and WAR Poms which doesn't have any dependecies, WARModule is a WebApp, I had a class in WARModule when i build the ParentApp with mvn clean install
under target folder under classes i still have
I'm basically trying to have a rest service in WARModule but unable to make it work, any help is appreciated. Thanks!!
You need to follow the Maven standard folder structure.
You should put all your java code inside src/main/java folder.
Looking at the image you uploaded, it looks like the SampleApp.java is not present in the correct directory as expected by maven.
My pom.xml file:
<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.name.MyProject</groupId>
<artifactId>MyProject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>example-jetty-embedded</artifactId>
<version>9.1.0.v20131115</version>
</dependency>
</dependencies>
</project>
and I got a problem:
Missing artifact
org.eclipse.jetty.tests:test-mock-resources:jar:9.1.0.v20131115
I see that mvnrepository does not contain this jar file (http://mvnrepository.com/artifact/org.eclipse.jetty.tests/test-mock-resources)
How can I fix this problem?
Test resources are not deployed to maven central by the Jetty project.
And example projects are usually not considered dependencies.