Hi list.
I just got hit by a weird interaction between two plugins, namely the
maven-enforcer-plugin and the maven-assembly-plugin:
I recently updated the versions for the plugins used in my build and
suddenly the creation of an assembly broke with an NPE:
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-assembly-plugin:2.4:single (assemble)
on project extjars: Execution assemble of goal
org.apache.maven.plugins:maven-assembly-plugin:2.4:single failed.
NullPointerException -> [Help 1]
Now the strange part is, that the m-a-p version had not been updated and
the assembly descriptor had not been changed.
Further investigation revealed the update of m-e-p to be the cause of
the error, as reverting to 1.2 (down from 1.3) magically made the build
work again.
I think this is a bug/regression that should be fixed, but: which of the
plugins should I file the Jira against? Is the m-e-p destroying data
that it should not touch or did the changed behaviour of m-e-p uncover a
bug in m-a-p?
If nothing else here's more proof of the necessity of nailing down all
the versions to get a reproducible build...
If you feel up to reproducing/analyzing the error here are the two
(merged and stripped down) files required:
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>
<properties>
<plugins.maven-enforcer-plugin.version>1.3</plugins.maven-enforcer-plugin.version>
</properties>
<groupId>ch.pecunifex.maven</groupId>
<artifactId>extjars</artifactId>
<version>2014.0.0-SNAPSHOT</version>
<packaging>pom</packaging>
<name>3rd-party Jars Assembly</name>
<description>
Collect all 3rd-party dependencies and assemble them for
redistribution.
</description>
<prerequisites>
<maven>3.0</maven>
</prerequisites>
<dependencies>
<dependency>
<groupId>asm</groupId>
<artifactId>asm-commons</artifactId>
<version>3.1</version>
</dependency>
<dependency>
<groupId>asm</groupId>
<artifactId>asm</artifactId>
<version>3.1</version>
</dependency>
<!-- ... -->
</dependencies>
<build>
<defaultGoal>package</defaultGoal>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-clean-plugin</artifactId>
<version>2.4.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.7</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-install-plugin</artifactId>
<version>2.3.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-site-plugin</artifactId>
<version>3.0</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<id>assemble</id>
<phase>package</phase>
<goals><goal>single</goal></goals>
<configuration>
<appendAssemblyId>false</appendAssemblyId>
<descriptors>
<descriptor>
extjars.xml
</descriptor>
</descriptors>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>${plugins.maven-enforcer-plugin.version}</version>
<executions>
<execution>
<id>enforce-plugin-versions</id>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<requirePluginVersions>
<message>Best Practice is to
always define plugin versions!</message>
</requirePluginVersions>
</rules>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
extjars.xml:
<assembly
xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2
http://maven.apache.org/xsd/assembly-1.1.2.xsd";>
<id>extjars</id>
<formats>
<format>zip</format>
</formats>
<includeBaseDirectory>false</includeBaseDirectory>
<dependencySets>
<dependencySet>
<outputDirectory>java/ext</outputDirectory>
<fileMode>0644</fileMode>
<directoryMode>0755</directoryMode>
<useTransitiveDependencies>false</useTransitiveDependencies>
<useProjectArtifact>false</useProjectArtifact>
<includes>
<include>asm:asm-commons:jar:3.1</include>
<include>asm:asm:jar:3.1</include>
</includes>
</dependencySet>
</dependencySets>
</assembly>
When called via:
mvn -Dplugins.maven-enforcer-plugin.version=1.2
a zip file is generated as expected, when called via
mvn -Dplugins.maven-enforcer-plugin.version=1.3
(or without argument) you will get the NPE.
Cheers,
Wolf
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