maven pom placeholder in parent/version tag is not replaced

Cthulhu — vr, 23 okt 2009 10:13:37 GMT

One point I did see in a presentation on Maven 3 (see this thread, too) was a note on 'Versionless parent elements'. I'm not entirely sure if this applies to this particular case, but it might. Although I'd still recommend adding a parent element version in all cases - else you can get funky results / compiler errors if it chooses a parent that has a different API than the one you intended it to.

maven pom placeholder in parent/version tag is not replaced

bramk — do, 22 okt 2009 15:17:58 GMT

More or less correct and effectively so.. The fact that this works for the webapp poms in the SDK is kind because of the way maven resolve parent references...

Maven looks for the parent pom first in the reactor of currently building projects, then in this location
on the filesystem, then the local repository, and lastly in the remote repo. relativePath allows you to
select a different location, for example when your structure is flat, or deeper without an intermediate
parent pom. However, the group ID, artifact ID and version are still required, and must match the file
in the location given or it will revert to the repository for the POM.

In the SDK case you will see that the backend webapp module actually has a parent declaration that matches (as in equals) the ../pom.xml, which in turn has a parent declaration that matches it's own ../pom.xml being the SDK root pom. This is not true for your WCB and therefore it fails.

So, basically this kind of works by accident and you can and should not use it outside your own project. In general I prefer to stick a project pom between the webmanager-wcbs pom and my own WCB poms so I can control the webmanager version an possibly other global settings in one place.

Regards,
Bram

maven pom placeholder in parent/version tag is not replaced

Cthulhu — ma, 19 okt 2009 11:36:15 GMT

that's probably because the ${parent.version} tag is only made available after the parent is actually loaded in. It can't know the value of parent.version without knowing which parent version it has - if you know what I mean, I'm confusing myself.

Say you've got WebManager 1.3.7, 9.8.5, and 9.502346.1 on your system - which one of the three should your WCB use? It can't know unless you specify one, which is why at least ${parent.version} won't work in the pom.

Hope that's what you mean.

maven pom placeholder in parent/version tag is not replaced

maxzilla — ma, 19 okt 2009 06:18:47 GMT

Hi Patrick,

placeholders do work, but not in the parent tag.
see code below. I can't make the parent -> version tag dynamic.


<?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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<artifactId>webmanager-libraries</artifactId>
		<groupId>nl.gx.webmanager.libraries</groupId>
		<version>9.6.2 <!-- why has this to be hardcoded? --> </version>
	</parent>
	<groupId>nl.gx.srb</groupId>
	<artifactId>snsbankstaticlib</artifactId>
	<name>SNS Bank static library</name>
	<description>Static library for the www.snsregiobank.nl website</description>
	<url>www.snsregiobank.nl</url>
	<version>1.2.0</version>
	<build>
		<defaultGoal>package</defaultGoal>
		<plugins>
			<plugin>
            	<artifactId>maven-antrun-plugin</artifactId>
            	<version>1.1</version>
            	<executions>
            		<execution>
            			<phase>package</phase>
            			<goals>
            				<goal>run</goal>
            			</goals>
            			<configuration>
            				<tasks>
				        		<echo message="Copying the WCB jar to deploy directory" />
				                <copy file="${project.build.directory}\${project.build.finalName}.jar" todir="${webmanager.wcbdeploydir}" overwrite="true" />
            				</tasks>
            			</configuration>
            		</execution>
            	</executions>
            </plugin>
		</plugins>
	</build>

maven pom placeholder in parent/version tag is not replaced

patricka — vr, 16 okt 2009 09:30:00 GMT

Can you give an example of what you are trying to do?

For local development, I usually copy this bit into my WCB's pom.xml:


<!--  plugin to copy the WCB to a local installation -->
<plugin>
    <artifactId>maven-antrun-plugin</artifactId>
    <version>1.1</version>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>run</goal>
            </goals>
            <configuration>
                <tasks>
                    <copy
                        file="${project.build.directory}\${project.build.finalName}.jar"
                        todir="${webmanager.wcbdeploydir}" overwrite="true" />
                </tasks>
            </configuration>
        </execution>
    </executions>
</plugin>

As you can see, this uses properties defined in the settings.xml and it works like a charm. I'm not sure what magic was involved to get it working - if any at all.

Greetings,

Patrick