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download file in activiti UI (vaadin 6)

Question asked by msaballa on Jan 17, 2017
Latest reply on Jan 19, 2017 by msaballa

Hi All,

Need your help with this one. Has anyone tried downloading a file in activiti BPM?

I'm new with activity BPM and original developer of the code created a customised button to retrieve csv files in activiti BPM as below.

public void buttonClick(ClickEvent event) {"preparing download resource");

 String csvdata = formProperty.getValue();

// the first line is the filename

filename = csvdata.substring(0, csvdata.indexOf('\r'));

csvdata = csvdata.substring(csvdata.indexOf('\r') + 2, csvdata.length());"downloading file " + filename);

StreamResource resource = new StreamResource(new StringStreamSource(csvdata), filename, ExplorerApp.get());





The code currently opens a new window. I'm looking for a way to download the file/open as a download dialog instead.

I tried to use FileDownloader but I think it clashed with the UI of activiti and I had the error below.

Caused by: java.lang.VerifyError: Bad type on operand stack
Exception Details:
    com/vaadin/server/FileDownloader.extend(Lcom/vaadin/ui/AbstractComponent;)V @2: invokespecial
    Type 'com/vaadin/ui/AbstractComponent' (current frame, stack[1]) is not assignable to 'com/vaadin/server/AbstractClientConnector'
  Current Frame:
    bci: @2
    flags: { }
    locals: { 'com/vaadin/server/FileDownloader', 'com/vaadin/ui/AbstractComponent' }
    stack: { 'com/vaadin/server/FileDownloader', 'com/vaadin/ui/AbstractComponent' }


Does anyone have any idea on how to incorporate the vaadin FileDownloader with the activity BPM UI?