Github user mcgilman commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/471#discussion_r65097776
  
    --- Diff: 
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-api/src/main/java/org/apache/nifi/web/StandardNiFiServiceFacade.java
 ---
    @@ -1354,55 +1349,55 @@ private void validateSnippetContents(final 
FlowSnippetDTO flow) {
         @Override
         public FlowEntity copySnippet(final String groupId, final String 
snippetId, final Double originX, final Double originY, final String 
idGenerationSeed) {
             final FlowDTO flowDto = revisionManager.get(groupId,
    -            rev -> {
    -                // create the new snippet
    -                final FlowSnippetDTO snippet = 
snippetDAO.copySnippet(groupId, snippetId, originX, originY, idGenerationSeed);
    -
    -                // validate the new snippet
    -                validateSnippetContents(snippet);
    +                rev -> {
    +                    // create the new snippet
    +                    final FlowSnippetDTO snippet = 
snippetDAO.copySnippet(groupId, snippetId, originX, originY, idGenerationSeed);
     
    -                // save the flow
    -                controllerFacade.save();
    -
    -                // drop the snippet
    -                snippetDAO.dropSnippet(snippetId);
    +                    // validate the new snippet
    +                    validateSnippetContents(snippet);
     
    -                // identify all components added
    -                final Set<String> identifiers = new HashSet<>();
    -                snippet.getProcessors().stream()
    -                    .map(proc -> proc.getId())
    -                    .forEach(id -> identifiers.add(id));
    -                snippet.getConnections().stream()
    -                    .map(conn -> conn.getId())
    -                    .forEach(id -> identifiers.add(id));
    -                snippet.getInputPorts().stream()
    -                    .map(port -> port.getId())
    -                    .forEach(id -> identifiers.add(id));
    -                snippet.getOutputPorts().stream()
    -                    .map(port -> port.getId())
    -                    .forEach(id -> identifiers.add(id));
    -                snippet.getProcessGroups().stream()
    -                    .map(group -> group.getId())
    -                    .forEach(id -> identifiers.add(id));
    -                snippet.getRemoteProcessGroups().stream()
    -                    .map(remoteGroup -> remoteGroup.getId())
    -                    .forEach(id -> identifiers.add(id));
    -                snippet.getRemoteProcessGroups().stream()
    -                    .flatMap(remoteGroup -> 
remoteGroup.getContents().getInputPorts().stream())
    -                    .map(remoteInputPort -> remoteInputPort.getId())
    -                    .forEach(id -> identifiers.add(id));
    -                snippet.getRemoteProcessGroups().stream()
    -                    .flatMap(remoteGroup -> 
remoteGroup.getContents().getOutputPorts().stream())
    -                    .map(remoteOutputPort -> remoteOutputPort.getId())
    -                    .forEach(id -> identifiers.add(id));
    +                    // save the flow
    +                    controllerFacade.save();
     
    -                final ProcessGroup processGroup = 
processGroupDAO.getProcessGroup(groupId);
    -                return revisionManager.get(identifiers,
    -                    () -> {
    -                        final ProcessGroupStatus groupStatus = 
controllerFacade.getProcessGroupStatus(groupId);
    -                        return dtoFactory.createFlowDto(processGroup, 
groupStatus, snippet, revisionManager);
    -                    });
    -            });
    +                    // drop the snippet
    +                    snippetDAO.dropSnippet(snippetId);
    +
    +                    // identify all components added
    +                    final Set<String> identifiers = new HashSet<>();
    +                    snippet.getProcessors().stream()
    +                            .map(proc -> proc.getId())
    +                            .forEach(id -> identifiers.add(id));
    +                    snippet.getConnections().stream()
    +                            .map(conn -> conn.getId())
    +                            .forEach(id -> identifiers.add(id));
    +                    snippet.getInputPorts().stream()
    +                            .map(port -> port.getId())
    +                            .forEach(id -> identifiers.add(id));
    +                    snippet.getOutputPorts().stream()
    +                            .map(port -> port.getId())
    +                            .forEach(id -> identifiers.add(id));
    +                    snippet.getProcessGroups().stream()
    +                            .map(group -> group.getId())
    +                            .forEach(id -> identifiers.add(id));
    +                    snippet.getRemoteProcessGroups().stream()
    +                            .map(remoteGroup -> remoteGroup.getId())
    +                            .forEach(id -> identifiers.add(id));
    +                    snippet.getRemoteProcessGroups().stream()
    +                            .flatMap(remoteGroup -> 
remoteGroup.getContents().getInputPorts().stream())
    --- End diff --
    
    I went ahead and addressed the issue myself. Take a look and make sure 
we're on the same page.
    
    
https://github.com/mcgilman/nifi/commit/6daea58b171368bede33248fd2d4a56d295c1687


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