In the process of migrating to Tapestry 4 (final), the Upload component
failed with a null pointer exception at line 84 in Upload.java. Top few
lines of the exception stack trace are:
---------------------------
Stack Trace:
org.apache.tapestry.form.Upload.rewindFormComponent(Upload.java:84)
org.apache.tapestry.form.AbstractFormComponent.renderComponent(AbstractFormComponent.java:115)
org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617)
org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:434)
.....
-----------------------------
I looked through JIRA; I could not locate a report on this specific
error. Anyway, I looked at the source and noticed that the error is
caused by the "file" variable being null when no file is being uploaded.
------------------------------------
IUploadFile file = getDecoder().getFileUpload(getName());
if (HiveMind.isBlank(file.getFileName())) //exception if "file" is null
{
file = null;
}
------------------------
I added a test to check for "file" being null
if (file! = null && HiveMind.isBlank(file.getFileName()))
and the exception went away.
Regards
Sohail Aslam
sohail.aslam AT google mail dot calm
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