I've discovered something funky about the testing server I use.  It seems that 
any changes made to it take several days to really take hold.  (It may be a 
firewall issue of some odd sort)

So, the white screen issue-here's the work around and things seem to be working 
better.   I added a /home to the end of the extension.  While I got an error, 
the page appeared and all started to work well.  Go figure.

We're going to be doing some bigger testing and attempt to migrated to version 
5 within the next 4 months.  I'm planning to move testing to an AIX server 
(WPAR) because our production is on an AIX server.

Thanks for the assistance.  At least I know my self-generated SSL is working 
correctly-and that's one of my biggest fears I have right now.

-Jeff


Jeffrey Trimble, MLS
William F. Maag Library
Youngstown State University
330.941.2483 (Office)
[email protected]
http://www.maag.ysu.edu
http://digital.maag.ysu.edu

From: Tim Donohue <[email protected]<mailto:[email protected]>>
Organization: DuraSpace
Date: Wednesday, June 22, 2016 at 12:38 PM
To: Jeffrey Trimble <[email protected]<mailto:[email protected]>>, 
"[email protected]<mailto:[email protected]>" 
<[email protected]<mailto:[email protected]>>
Subject: Re: [dspace-tech] Tomcat7 and XMLUI


Hi Jeff,

The error you are seeing in your Catalina logs seems to be a rather old issue 
in DSpace 1.6, which had some (later discovered) memory issues.  That memory 
leak was one reported on lists back in 2010:

http://dspace.2283337.n4.nabble.com/Dspace-tech-tomcat-reporting-memory-leak-td3287524.html

It was then worked on heavily after those community reports:

http://www.mail-archive.com/[email protected]/msg12161.html

And resolved in DSpace 1.7 which featured massive performance/scalability 
improvements (at least for their time):

https://wiki.duraspace.org/display/DSDOC17/Preface

That all being said, I'm not sure that exact performance error would be causing 
a blank screen.  But, I guess it's possible.

It probably is worth considering whether it's possible to upgrade your DSpace 
site.  DSpace 1.6 is unsupported these days, but it is possible to directly 
migrate your 1.6 data into a 5.x installation via the normal Upgrade process 
(which now migrates data automatically): 
https://wiki.duraspace.org/display/DSDOC5x/Upgrading+DSpace

It is also worth noting that DSpace 1.6 was released on Java 5 and Tomcat 4.  
While it's possible it may work on modern versions of Java and Tomcat, it's 
never been tested as such. But, maybe others on this list are running DSpace 
1.6 on Java 6 and Tomcat 7 (and can speak up about their setup)?

Not sure if any of this helps, but it's hard to tell what the core issue may be 
here.  Perhaps someone else running DSpace 1.6 may have tips to provide.

Tim

On 6/22/2016 8:17 AM, Jeffrey A Trimble wrote:
I've got a very strange issue here.  On my test server I have loaded tomcat 
7.0.69.  Whether or not SSL is turned on, when I attempt to connect to the 
XMLUI version, I receive a blank (white) screen with nothing on it.  The JSPUI 
screen is fine.

This is concerning to me since I want to move forward with our projects.  I've 
look at the Catalina logs and here's what I have found:


INFO: Reloading Context with name [/xmlui] is completed

Jun 22, 2016 9:02:41 AM org.apache.catalina.loader.WebappClassLoaderBase 
clearReferencesThreads

SEVERE: The web application [/xmlui] appears to have started a thread named 
[FinalizableReferenceQueue] but has failed to stop it. This is very likely to 
create a memory leak.


Informational:  DSpace 1.6, Java 6, Tomcat 7.0.69

Linux dtest 3.0.101-0.46-default #1 SMP Wed Dec 17 11:04:10 UTC 2014 (8356111) 
x86_64 x86_64 x86_64 GNU/Linux

Any clues as to what I need to investigate and look at closely?

Thanks in advance,

Jeff

Jeffrey Trimble, MLS
William F. Maag Library
Youngstown State University
330.941.2483 (Office)
[email protected]<mailto:[email protected]>
<http://www.maag.ysu.edu>http://www.maag.ysu.edu
http://digital.maag.ysu.edu
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Tim Donohue
Technical Lead for DSpace & DSpaceDirect
DuraSpace.org | DSpace.org | DSpaceDirect.org

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