Blank screen on XMLUI Dspace 1.6.0
----------------------------------

                 Key: DS-605
                 URL: http://jira.dspace.org/jira/browse/DS-605
             Project: DSpace 1.x
          Issue Type: Bug
          Components: XMLUI
    Affects Versions: 1.6.0
         Environment: apache-tomcat-6.0.18
jdk1.6.0_13
Debian GNU Linux 5.0
            Reporter: Antero Neto
            Priority: Critical


The interface of Dspce XMLUI shows a blank screen and I need to reboot Tomcat.
JSPUI The interface is not affected by the issue. It happens sporadically. 

I'm using version 1.6.0 of DSpace. I use a theme based on the theme "Reference" 
which comes in DSpace.

Below, some log information that may be related.

2010-06-09 00:07:00,741 ERROR cocoon.handled  - Could not read resource 
cocoon://DRI/2/handle/xxxx/xxx/workflow
        at <map:serialize type="xml"> - 
resource://aspects/Statistics/sitemap.xmap:70:31
        at <map:transform type="Navigation"> - 
resource://aspects/Statistics/sitemap.xmap:38:55
        at <map:generate> - resource://aspects/Statistics/sitemap.xmap:33:19
...
org.apache.cocoon.ProcessingException: Could not read resource 
cocoon://DRI/2/handle/xxxx/xxx/workflow
        at <map:serialize type="xml"> - 
resource://aspects/Statistics/sitemap.xmap:70:31
        at <map:transform type="Navigation"> - 
resource://aspects/Statistics/sitemap.xmap:38:55
        at <map:generate> - resource://aspects/Statistics/sitemap.xmap:33:19
...
Caused by: java.lang.NullPointerException
        at 
org.apache.cocoon.components.source.impl.SitemapSource.init(SitemapSource.java:292)
        at 
org.apache.cocoon.components.source.impl.SitemapSource.<init>(SitemapSource.java:148)
        at 
org.apache.cocoon.components.source.impl.SitemapSourceFactory.getSource(SitemapSourceFactory.java:62)
        at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:153)
        at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:183)
        at 
org.apache.cocoon.generation.FileGenerator.setup(FileGenerator.java:99)
        at 
org.dspace.app.xmlui.cocoon.AspectGenerator.setup(AspectGenerator.java:112)
        at sun.reflect.GeneratedMethodAccessor57.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)


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