Creating a thumbnail within a workflow process

Hi,
Within my workflow process, I want to create thumbnail images of the files/documents that have been uploaded in a page through the out of the box 'Download' component. I want to store these thumbnails on the same page(within /content/mypage). As far as I know, the logic of thumbnail creation of an uploaded files is already available in the DAM. On further probing, I got to know that the thumbnail creation is done as part of a workflow and the workflow process is 'CreateThumbnailProcess'(com.day.cq.dam.core.process.CreateThumbnailProcess). So I tried creating an instance of the CreateThumbnailProcess and calling the execute() method of this process within my workflow process. Here's a glimpse of what I did.
public void execute(WorkItem item, WorkflowSession session, MetaDataMap args) throws WorkflowException {
     CreateThumbnailProcess proc = new CreateThumbnailProcess();
     System.out.println("Test Workflow entered!!");
     proc.execute(item, session, args);
     System.out.println("Test Workflow executed. Thumbnail created!!");
But when I start my workflow, I keep getting "Test Workflow entered!!" multiple number of times on my console. I am unable to understand what's happening. Please help me. If there are any simpler alternatives to create a thumbnail, please suggest them too.
Thanks in advance
Shriram K M

Ok.
So couple of things which you can try out to check what's causing the issue.
1. If you comment
//proc.execute(item, session, args);
does it still causing the same issue. If yes, then problem would be somewhere in your workflow call or process execution which calling this process recurring (i can assume as not see the whole code) and, if not, then this call is only causing the issue which is pretty wierd (looking into possibility and will update you) if you do not have extended the same process as you mentioned above.
2. Not sure calling another process like this is correct way to do it because CreateThumbnailProcess automatically gets called in cq when image object created in system to create default renditions.
To answer you other question.
creating extra thumbnail apart from default renditions you should have to create workflow process as you already did but extend AbstractAssetWorkflowProcess (dont call CreateThumbnailProcess.execute() because there is default workflow process already setup.) and below code in execute method
Asset asset = getAssetFromPayload(workItem, workflowSession.getSession());
oriIs = asset.getOriginal().adaptTo(Node.class)
.getProperty(JcrConstants.JCR_CONTENT + "/" + JcrConstants.JCR_DATA).getBinary().getStream();
asset.addRendition(rendition, oriIs, mimetype); //mimetype and rendition you have to create it as an object based on your requirement.
also check http://dev.day.com/docs/en/cq/current/javadoc/com/day/cq/dam/core/process/CreateThumbnailP rocess.html for more detail.
Let me know for more information.
Thanks,
Pawan

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