XPages File Download Control: NotesException "Object has been removed or recycled" - xpages

Question

I have troubles with the XPages xp:fileDownload core control, running on a Domino 9.0.1 FP3 server. On a Domino 8.5.3 FP6 server I have no problems, it works perfect!
Here's the simple source code of the xpage:
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core">
<xp:this.data>
<xp:dominoDocument var="document1" computeWithForm="onsave"
formName="Files" action="editDocument"
documentId="6E004D63CD737B79C1257E520050C14C">
</xp:dominoDocument>
</xp:this.data>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:fileUpload id="fileUpload1" value="#{document1.Body}"></xp:fileUpload>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:fileDownload rows="30" id="fileDownload1" displayLastModified="false"
value="#{document1.Body}" allowDelete="true">
</xp:fileDownload>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:button value="Save" id="button1">
<xp:eventHandler event="onclick" submit="true" refreshMode="complete">
<xp:this.action>
<xp:saveDocument var="document1"></xp:saveDocument>
</xp:this.action>
</xp:eventHandler>
</xp:button>
</xp:view>
Take a look at the following scenario:
Upload some files (using xp:fileUpload core control)
Delete a file and save the document (repeat this step)
After some repeats, I get the following notes exception
Remember: I have no troubles on Domino Server 8.5.3 FP6!

Answer 1

This may be caused by XPage persistence settings. The component tree is stored in memory / on disk and there are a maximum number of entries, set in XSP Properties. The amount of uploads / deletes may be meaning the original component tree is no longer available.
Check the persistence settings in the application / server. If this is the cause it will consistently fail after x refreshes on the same page.
One option is increasing. Alternatively, in 9.0.1 the file upload can be changed to run via a partial refresh, which may also resolve the problem.