fails with NullPointer on docker:build

[computerlyrik]

First: Great plugin
Second: Error giving following 08/15 pom.xml

<?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>de.computerlyrik</groupId>
    <artifactId>docker-mvn-test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <name>foo</name>


    <build>
        <plugins>
            <plugin>
                <groupId>org.jolokia</groupId>
                <artifactId>docker-maven-plugin</artifactId>
                                                    <version>0.13.0</version>

                <configuration>
                    <images>
                        <image>
                            <alias>foo</alias>
                            <name>foo</name>
                            <build></build>
                        </image>

                    </images>
                </configuration>
                <executions>
                    <execution>
                        <id>install</id>
                        <phase>install</phase>
                        <goals>
                            <goal>build</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>


</project>

run mvn install

[computerlyrik]

[ERROR] Failed to execute goal org.jolokia:docker-maven-plugin:0.13.0:build (install) on project docker-mvn-test: Execution install of goal org.jolokia:docker-maven-plugin:0.13.0:build failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.jolokia:docker-maven-plugin:0.13.0:build (install) on project docker-mvn-test: Execution install of goal org.jolokia:docker-maven-plugin:0.13.0:build failed.
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:224)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
        at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:197)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution install of goal org.jolokia:docker-maven-plugin:0.13.0:build failed.
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
        ... 20 more
Caused by: java.lang.NullPointerException
        at org.jolokia.docker.maven.assembly.DockerAssemblyManager.createDockerTarArchive(DockerAssemblyManager.java:85)
        at org.jolokia.docker.maven.AbstractBuildSupporMojo.buildImage(AbstractBuildSupporMojo.java:79)
        at org.jolokia.docker.maven.BuildMojo.executeInternal(BuildMojo.java:36)
        at org.jolokia.docker.maven.AbstractDockerMojo.execute(AbstractDockerMojo.java:147)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
        ... 21 more

[computerlyrik]

I am trying to emulate the command
docker build -t my-rails-app .
with from=>rails:onbuild

as mentioned here https://registry.hub.docker.com/_/rails/

[rhuss]

I don't see what you want to achieve with you plugin configuration. The exception is ugly indeed, and I will fix that for 0.13.3 (0.13.2 is just about to be released).

Maybe you can elaborate a bit on your use case ?

[jgangemi]

dup of #236 (or #236 was a dup of this)