NIFI-13773 Support different versions of nifi-api and nifi-framework-…

…api (apache#39)

- Added nifi-framework-api to the classpath only if it is a dependency of the extension and with the provided version

Signed-off-by: David Handermann <exceptionfactory@apache.org>

src/main/java/org/apache/nifi/extension/definition/extraction/ExtensionClassLoaderFactory.java

@@ -239,23 +239,25 @@ private Artifact getProvidedArtifact(final String groupId, final String artifact
     private ExtensionClassLoader createProvidedEntitiesClassLoader(final ArtifactsHolder artifactsHolder)
             throws MojoExecutionException, ProjectBuildingException {
 
+        final Set<Artifact> providedArtifacts = new HashSet<>();
+
         final String nifiApiVersion = determineProvidedEntityVersion(artifactsHolder.getAllArtifacts(), "org.apache.nifi", "nifi-api");
         if (nifiApiVersion == null) {
             throw new MojoExecutionException("Could not find any dependency, provided or otherwise, on [org.apache.nifi:nifi-api]");
         } else {
             getLog().info("Found a dependency on version " + nifiApiVersion + " of NiFi API");
         }
-
-        final String slf4jApiVersion = determineProvidedEntityVersion(artifactsHolder.getAllArtifacts(),"org.slf4j", "slf4j-api");
-
         final Artifact nifiApiArtifact = getProvidedArtifact("org.apache.nifi", "nifi-api", nifiApiVersion);
-        final Artifact nifiFrameworkApiArtifact = getProvidedArtifact("org.apache.nifi", "nifi-framework-api", nifiApiArtifact.getVersion());
+        providedArtifacts.add(nifiApiArtifact);
 
-        final Artifact slf4jArtifact = getProvidedArtifact("org.slf4j", "slf4j-api", slf4jApiVersion);
+        final String nifiFrameworkApiVersion = determineProvidedEntityVersion(artifactsHolder.getAllArtifacts(),"org.apache.nifi", "nifi-framework-api");
+        if (nifiFrameworkApiVersion != null) {
+            final Artifact nifiFrameworkApiArtifact = getProvidedArtifact("org.apache.nifi", "nifi-framework-api", nifiFrameworkApiVersion);
+            providedArtifacts.add(nifiFrameworkApiArtifact);
+        }
 
-        final Set<Artifact> providedArtifacts = new HashSet<>();
-        providedArtifacts.add(nifiApiArtifact);
-        providedArtifacts.add(nifiFrameworkApiArtifact);
+        final String slf4jApiVersion = determineProvidedEntityVersion(artifactsHolder.getAllArtifacts(),"org.slf4j", "slf4j-api");
+        final Artifact slf4jArtifact = getProvidedArtifact("org.slf4j", "slf4j-api", slf4jApiVersion);
         providedArtifacts.add(slf4jArtifact);
 
         getLog().debug("Creating Provided Entities Class Loader with artifacts: " + providedArtifacts);