Fix #578: NullpointerException in ContainerEnvJavaOptionsMergeEnricher

+ Fix NullPointerException in ContainerEnvJavaOptionsMergeEnricher
+ Add FAQ for image name configuration in docs
+ Add note in docs for image precedence of XML configuration over
  generators
+ Added sentence in `jkube.generator.name` flag description that it's
  only applicable in scope of generators

CHANGELOG.md

@@ -28,6 +28,7 @@ Usage:
 * Fix #630: Document usage for `jkube.build.switchToDeployment` flag
 * Fix #647: Resource configuration can now add annotations and labels to ServiceAccount
 * Fix #632: Add support for Quarkus Fast Jar Packaging
+* Fix #578: NullPointerException in ContainerEnvJavaOptionsMergeEnricher on k8s:resource
 * Fix #682: Update CircleCI image to new version
 
 ### 1.2.0 (2021-03-31)

jkube-kit/enricher/generic/src/main/java/org/eclipse/jkube/enricher/generic/ContainerEnvJavaOptionsMergeEnricher.java

@@ -77,6 +77,7 @@ public ContainerEnvJavaOptionsMergeVisitor(List<ImageConfiguration> imageConfigu
     public void visit(ContainerBuilder containerBuilder) {
       imageConfigurations.stream()
           .filter(ic -> ImageEnricher.containerImageName(ic).equals(containerBuilder.getImage()))
+          .filter(ic -> ic.getBuild() != null)
           .filter(ic -> ic.getBuild().getEnv() != null)
           .filter(ic -> !ic.getBuild().getEnv().isEmpty())
           .filter(ic -> ic.getBuild().getEnv().containsKey(ENV_KEY))

jkube-kit/enricher/generic/src/test/java/org/eclipse/jkube/enricher/generic/ContainerEnvJavaOptionsMergeTest.java

@@ -104,6 +104,24 @@ public void enrichWithDisabledShouldDoNothing() {
         .containsOnly(new EnvVar("JAVA_OPTIONS", "val-from-container", null));
   }
 
+  @Test
+  public void enrichWithNullBuildInImageConfiguration() {
+    // Given
+    // @formatter:off
+    new Expectations() {{
+      imageConfiguration.getName(); result = "the-image:latest"; minTimes = 0;
+      imageConfiguration.getBuild(); result = null;
+    }};
+    // @formatter:on
+    // When
+    containerEnvJavaOptionsMergeEnricher.enrich(PlatformMode.kubernetes, kubernetesListBuilder);
+    // Then
+    assertThat(containerList(kubernetesListBuilder))
+            .flatExtracting("env")
+            .hasSize(1)
+            .containsOnly(new EnvVar("JAVA_OPTIONS", "val-from-container", null));
+  }
+
   @Test
   public void enrichWithNullEnvInImageConfiguration() {
     // Given

kubernetes-maven-plugin/doc/src/main/asciidoc/inc/_faq.adoc

@@ -141,3 +141,21 @@ You can also provide a host for it in XML config like this:
 
 You can find an example in our link:https://github.com/eclipse/jkube/tree/master/quickstarts/maven/spring-boot[spring-boot]
 quickstart in `kubernetes-with-ingress` profile.
+
+=== How to configure image name generated by Eclipse JKube?
+
+If you want to configure image name generated by Eclipse JKube which is `%g/%a:%l` by default(see <<image-name>>). It will depend upon what mode you're using in Eclipse JKube:
+
+- If you're using <<zero-config, zero configuration mode>>, which means you depend on Eclipse JKube <<generators>> to generate an opinionated image, you will be able to do it using `jkube.generator.name` maven property.
+- If you're providing <<config-image, XML image configuration>>, image name would be picked from `<name>` tag like in this example:
+[source,xml,indent=0,subs="verbatim,quotes,attributes"]
+----
+<image>
+  <name>myusername/myimagename:latest</name> <!-- Your image name -->
+  <build>
+      <from>openjdk:latest</from>
+      <cmd>java -jar maven/${project.artifactId}-${project.version}.jar</cmd>
+  </build>
+</image>
+----
+- If you're using <<simple-dockerfile-build, Simple Dockerfile Mode>>, you can configure image name via `jkube.image.name` or `jkube.generator.name` flags

kubernetes-maven-plugin/doc/src/main/asciidoc/inc/generator/_options_common.adoc

@@ -31,7 +31,9 @@ There are some configuration options which are shared by all generators:
 
 | *name*
 | The Docker image name used when doing Docker builds. For OpenShift S2I builds its the name of the image stream. This
-  can be a pattern as descibed in <<image-name-placeholders, Name Placeholders>>. The default is `%g/%a:%l`.
+  can be a pattern as described in <<image-name-placeholders, Name Placeholders>>. The default is `%g/%a:%l`. Note that this flag would only work
+  when you're using opinionated image configuration provided by generators. if generators are not applicable for your project configuration, this
+  flag won't work.
 | `jkube.generator.name`
 
 | *registry*

kubernetes-maven-plugin/doc/src/main/asciidoc/inc/goals/build/_jkube-build.adoc

@@ -80,7 +80,7 @@ endif::[]
 The following sections describe the usual configuration, which is similar to the build configuration used in the
  https://dmp.fabric8.io[docker-maven-plugin].
 
-In addition a more automatic way for creating predefined build configuration can be performed with so called <<generators, Generators>>. Generators are very flexible and can be easily created. These are described in an extra <<generators, section>>.
+In addition a more automatic way for creating predefined build configuration can be performed with so called <<generators, Generators>>. Generators are very flexible and can be easily created. These are described in an extra <<generators, section>>. Note that if you're providing your own XML image configuration, it would be given more precedence. Generators won't be used in case you're already using your own custom image configuration.
 
 Global configuration parameters specify overall behavior common for all images to build. Some of the configuration options are shared with other goals.