Hi,
This is mainly an email to document my problems with upgrading
several applications from 1.0 to 1.1 so that others might find
solutions to these problems quicker than I! I just upgraded three
applications with a total of approximately 500 pages and it was quite
painful.
Firstly I'd like to that the removal of the "deprecated HTML
attributes" like align/width etc. was a bad idea in my opinion.
While those aren't the preferred way to do styling any more they are
perfectly valid HTML. It unfortunately took quite a while to track
down all uses of now-verboten attributes and fix them up. Not a huge
deal, but time consuming and of absolutely no value to me or my client.
Secondly, and much more painful, after upgrading nearly all of my
display:tables starting throwing NullPointerExceptions! The top few
lines of stack trace are included here:
java.lang.NullPointerException
at
org.displaytag.util.MultipleHtmlAttribute.addAllAttributesFromArray
(MultipleHtmlAttribute.java:56)
at org.displaytag.util.MultipleHtmlAttribute.<init>
(MultipleHtmlAttribute.java:45)
at org.displaytag.model.Row.getOpenTag(Row.java:146)
at org.displaytag.render.HtmlTableWriter.writeRowOpener
(HtmlTableWriter.java:246)
at org.displaytag.render.TableWriterTemplate.writeTableBody
(TableWriterTemplate.java:346)
at org.displaytag.render.TableWriterTemplate.writeTable
(TableWriterTemplate.java:133)
at org.displaytag.render.HtmlTableWriter.writeTable
(HtmlTableWriter.java:643)
at org.displaytag.tags.TableTag.writeHTMLData(TableTag.java:
1549)
at org.displaytag.tags.TableTag.doEndTag(TableTag.java:1218)
After much hunting around this turned out to be caused by (as far as
I could tell) our applications having a displaytag.properties file
that did *not* contain entries for "css.tr.even" and "css.tr.odd".
Why this should be I don't know. 1.0 certainly allowed you to
specify only those values you were interested in, and the
documentation for 1.1 clearly states that if these values are not
specified they default to "even" and "odd" respectively. I did some
searching around on this and turned up nothing which makes me wonder
if there is another factor at play here, but either way this made it
most definitely not a "drop-in-replacement" for 1.0!!
In tracking all this down I ended up grabbing the source for display
tag so I could debug what was going on (never a good sign). To my
dismay it appears that the only way to get the source is through
svn. Is that true? The distributions do not appear to contain
source in any form. It'd be nice to include the source in the .zip
and .tgz even if it's not a full build environment.
Anyway, I have it all working now, but I thought the developers and
others might like to know about these problems!
-t
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