Tapestry Upload Component

Provides a file upload component for Tapestry based on Jakarata Commons FileUpload.

This is packaged as an add-on to Tapestry because of the number of additional dependencies it adds. However, Maven takes care of that for you!

Usage

The upload component supports default value binding (based on id) and validation.

Component Template

    <t:form>
        <t:errors/>
        <input t:type="upload" t:id="file" validate="required"/>
        <br/>
        <input type="submit" value="Upload"/>
    </t:form>

Here, because the value parameter was not bound, the component used the file property of its container (because the component's id is 'file'). If you want to upload as a different property, either bind the value parameter or change the component's id.

Page class

    public class UploadExample
    {
        private UploadedFile file;

        public UploadedFile getFile()
        {
            return file;
        }

        public void setFile(UploadedFile file)
        {
            this.file = file;
        }

        public void onSuccess()
        {
            File copied = new File("/my/file/location/" + file.getFileName());
            
            file.write(copied);
        }
    }

Potential Issues

The Commons FileUpload library uses the CommonsIO file cleaner service to remove temporary files when they are no longer needed. This service creates a thread to carry out its work. If the commons-io library is shared amongst multiple applications (e.g. added to server classpath) it is possible for an application to terminate this thread prematurely and cause errors for the other applications. (see the Resource Cleanup section in for more discussion)

Technically the file cleanup service is not needed by Tapestry Upload (which deletes temporary files at the end of request processing). However it is currently not possible to disable it (enhancement request has been filed as FILEUPLOAD-133).