[MPH-206] help:effective-pom produces invalid xml (duplicate xml declarations) when bound to a phase in the lifecycle

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 3.4.0
• Component/s: effective-pom
• Assignee: Unassigned
• Reporter: Ben Davini
• Created: 05/Apr/23 13:45
• Updated: 05/Apr/23 14:04

Description

When the maven-help-plugin is invoked as part of the maven lifecycle (see configuration below), it produces xml with 2 XML version declarations, like this (generated with 'mvn clean install'):

 

<?xml version="1.0" encoding="UTF-8"?>
<!-- ====================================================================== --><!--                                                                        --><!-- Generated by Maven Help Plugin                                         --><!-- See: https://maven.apache.org/plugins/maven-help-plugin/               --><!--                                                                        --><!-- ====================================================================== --><!-- ====================================================================== --><!--                                                                        --><!-- Effective POM for project                                              --><!-- '<project coordinates>' --><!--                                                                        --><!-- ====================================================================== -->
<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 

When invoked via the command line (mvn help:effective-pom -Doutput=effective-pom.xml), the xml produced is valid (note no duplicate xml declaration before the 'project' declaration):

<?xml version="1.0" encoding="UTF-8"?>
<!-- ====================================================================== --><!--                                                                        --><!-- Generated by Maven Help Plugin                                         --><!-- See: https://maven.apache.org/plugins/maven-help-plugin/               --><!--                                                                        --><!-- ====================================================================== --><!-- ====================================================================== --><!--                                                                        --><!-- Effective POM for project                                              --><!-- '<project coordinates>' --><!--                                                                        --><!-- ====================================================================== -->
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> 

 

 

Configuration as part of lifecycle:

 

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-help-plugin</artifactId>
    <version>${maven-help-plugin.version}</version>
    <executions>
        <execution>
            <id>effective-pom</id>
            <phase>verify</phase>
            <goals>
                <goal>effective-pom</goal>
            </goals>
            <configuration>
                <output>${project.build.directory}/effective-pom.xml</output>
                <verbose>true</verbose>
            </configuration>
        </execution>
    </executions>
</plugin>