mvn bootstrapper plugin failing with NPE

[cskinfill]

Bug Report

What did you do?

From here, I ran

mvn io.javaoperatorsdk:bootstrapper:4.9.0:create -DprojectGroupId=org.acme -DprojectArtifactId=getting-started

which resulted in a NullPointerException. Running again with the -e and -X flags results in (with some of the stacktrace omitted)

[ERROR] Failed to execute goal io.javaoperatorsdk:bootstrapper:4.9.0:create (default-cli) on project standalone-pom: Execution default-cli of goal io.javaoperatorsdk:bootstrapper:4.9.0:create failed: inputStream -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal io.javaoperatorsdk:bootstrapper:4.9.0:create (default-cli) on project standalone-pom: Execution default-cli of goal io.javaoperatorsdk:bootstrapper:4.9.0:create failed: inputStream
...
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal io.javaoperatorsdk:bootstrapper:4.9.0:create failed: inputStream
...
Caused by: java.lang.NullPointerException: inputStream
    at java.util.Objects.requireNonNull (Objects.java:248)
    at org.apache.commons.io.IOUtils.copyLarge (IOUtils.java:1479)
    at org.apache.commons.io.IOUtils.copy (IOUtils.java:1107)
    at org.apache.commons.io.IOUtils.copyLarge (IOUtils.java:1456)
    at org.apache.commons.io.IOUtils.copy (IOUtils.java:1085)
    at org.apache.commons.io.FileUtils.copyToFile (FileUtils.java:1078)
    at org.apache.commons.io.FileUtils.copyInputStreamToFile (FileUtils.java:986)
    at io.javaoperatorsdk.boostrapper.Bootstrapper.addStaticFile (Bootstrapper.java:124)
    at io.javaoperatorsdk.boostrapper.Bootstrapper.addStaticFile (Bootstrapper.java:113)
    at io.javaoperatorsdk.boostrapper.Bootstrapper.lambda$addStaticFiles$1 (Bootstrapper.java:109)
    at java.lang.Iterable.forEach (Iterable.java:75)
    at io.javaoperatorsdk.boostrapper.Bootstrapper.addStaticFiles (Bootstrapper.java:109)
    at io.javaoperatorsdk.boostrapper.Bootstrapper.create (Bootstrapper.java:37)
    at io.javaoperatorsdk.boostrapper.BootstrapperMojo.execute (BootstrapperMojo.java:23)
...
[ERROR] 
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException

It appears that the .gitignore file is missing from the bootstrapper-4.9.0.jar archive, but it is referenced in the boostrapper code here

$ jar -t -f bootstrapper-4.9.0.jar
META-INF/
META-INF/MANIFEST.MF
META-INF/maven/
META-INF/maven/io.javaoperatorsdk/
META-INF/maven/io.javaoperatorsdk/bootstrapper/
static/
io/
io/javaoperatorsdk/
io/javaoperatorsdk/boostrapper/
io/javaoperatorsdk/bootstrapper/
templates/
templates/k8s/
META-INF/maven/plugin.xml
META-INF/maven/io.javaoperatorsdk/bootstrapper/plugin-help.xml
static/README.md
log4j2.xml
io/javaoperatorsdk/boostrapper/Bootstrapper.class
io/javaoperatorsdk/boostrapper/BootstrapperMojo.class
io/javaoperatorsdk/bootstrapper/Versions.class
templates/Runner.java
templates/Status.java
templates/pom.xml
templates/CustomResource.java
templates/Reconciler.java
templates/k8s/test-resource.yaml
templates/log4j2.xml
templates/Spec.java
templates/ReconcilerIntegrationTest.java
templates/ConfigMapDependentResource.java
META-INF/maven/io.javaoperatorsdk/bootstrapper/pom.xml
META-INF/maven/io.javaoperatorsdk/bootstrapper/pom.properties

What did you expect to see?

Expectation was a "getting started" project for the java operator sdk.

What did you see instead? Under which circumstances?

[ERROR] Failed to execute goal io.javaoperatorsdk:bootstrapper:4.9.0:create (default-cli) on project standalone-pom: Execution default-cli of goal io.javaoperatorsdk:bootstrapper:4.9.0:create failed: inputStream -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal io.javaoperatorsdk:bootstrapper:4.9.0:create (default-cli) on project standalone-pom: Execution default-cli of goal io.javaoperatorsdk:bootstrapper:4.9.0:create failed: inputStream

Environment

Running local machine on an M3 Apple macbook pro.

Possible Solution

mvn assembly plugin is missing the .gitignore and it looks like the default exclusion policy ignores source-control related files (like .gitignore).