HTML in Java best practices?

I have developed an application that performs some data analysis. When the data is analyzed I create a result file in XML using JDOM. This information is then transformed into HTML using XSLT (xalan). The resulting HTML is launched in the standard browser (Netscape in this case) so that the user can view the results in a nicely formatted view.
I have a problem with the current solution because of the amount of data involved. The resulting XML file is huge so the DOM tree built up consumes a lot of memory. The transformation can take more than 10 minutes in some cases (disc swapping occurs).
The reason I guess for the current solution was to keep the HTML stuff separated in the XSL style sheets and the data describing the result in the XML files. I did not come up with this solution myself.
What are your suggestions for an alternative solution? I still want to produce the result files in HTML but I could as well write it directly to a file by browsing my in memory objects. How do I then represent the HTML in my code? I do want to keep things as separated (OO) as possible.
I figure you could do something like:
Writer out = ...
out.write("<html>");
out.write("<body>");
out.write("<title>" + title + "</title>");etc.
but it smells code duplication and maintenance problems to me.
I would somehow like to iterate my objects and write the output in a more SAX inspired fashion but encapsulate the HTML parts. Is there an existing framework for this somewhere? I know there is a package javax.swing.text.html with a lot of HTML helper classes, can they be utilized somehow? Could JSP be used for this kind of situation (there is no http or client/server stuff involved in this)?

well, an interesting problem. I have heard this a lot in the XML world.
I was thinking that JSP would be your best bet, but then you mentioned
that there is no web server so that puts the nixay on that.
Personaly I am not aware of a way to do it, maybe there are better
XSLT's to use.
Hmm, considering that all you are doing is viewing the file, it may be
best to install a small web server on the PC and use JSP. We do this
at some clients for reporting, makes it a hell of a lot easier. This
way you could dispense with the XML and XSLT and just generate HTML,
when viewed from a web browser.
James.

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If you don't have info to decide - what kind of profiling would you be running and then adjust what JVM setting in your trials?
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Actually, If we can establish that finetuning of these parameters is a good idea, it will certainly also be much easier to allocate the time for doing so. - reading, experimenting etc. in our project.
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Something like that - some best practices? Thats what we are hoping for.
best wishes
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Thanks for helpful answer from both you and kajbj.
The app doesn't use shared network drives.
What are you doing between main starts to get executed and the UI is
displayed?
Basicly, Calculating what to show in the UI. Accessing server - not so much, there are some reads from a cache, but the profiling doesnt indicate that it should be a problem. Sure, I could shift the startup time to some other slot, but sofar I havent found a place where the end-user wouldnt be annoyed.> Caching of something would seem most obvious. Normal VM stuff >seems unlikely. With profiling i basicly find that ''everything'' takes a lot longer in the cold start scenario. Some of our local java methods are going to be rewritten following our review. But what else can be tuned?You guys dont think the Java Quick Start approach, with more jars in disk cache will give something? And how should that be done/ what does people do?I.e. For the class loader I read something about
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2.Extensions class loader
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Otherwise it seems to me that it must be about finetuning the JVM?
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Googling heap size for XP
CHE22 writes:
You are right; -Xms1600M works well, but -Xms1700M bombs
Thats one best practice or what?
On garbage collection, there are numerous posts, and much "masters of Java black art" IMHO, And according to profiling GC is not really that much of a problem anyway? Still,
Based on my description I was hoping for a short reply like "try setting these two parameters on your xp box, it worked for me" ...or something like that. With no takers on that one, I fear people are saying that there is nothing to be gained there?
we read:
[ -Xmx3800m -Xms3800m
Configures a large Java heap to take advantage of the large memory system.
-Xmn2g
Configures a large heap for the young generation (which can be collected in parallel), again taking advantage of the large memory system. It helps prevent short lived objects from being prematurely promoted to the old generation, where garbage collection is more expensive.
Unless you have problems with pauses, try granting as much memory as possible to the virtual machine. The default size (64MB) is often too small.
Setting -Xms and -Xmx to the same value increases predictability by removing the most important sizing decision from the virtual machine. On the other hand, the virtual machine can't compensate if you make a poor choice.
The -XX:+AggressiveHeap+ option inspects the machine resources (size of memory and number of processors) and attempts to set various parameters to be optimal for long-running, memory allocation-intensive jobs]
So is Setting -Xms and -Xmx and -XX:AggressiveHeap
best practice? What kind of performance improvement should we expect?
Concerning JIT:
I read this one
[the impact of the JIT compiler is obvious on the graph: at startup the time taken is around 500us for the first few values, then quickly drops to 130us, before falling again to 70us, where it stays for 30 minutes,
for this specific issue, I greatly improved my performances by configuring another VM argument: I set -XX:CompileThreshold=50]
The size of the cache can be changed with
-Xmaxjitcodesize
This sounds like you should do something with JIT args, but reading
// We disable the JIT during toolkit initialization. This
// tends to touch lots of classes that aren't needed again
// later and therefore JITing is counter-productiive.
java.lang.Compiler.disable();
However, finding
the sweet spots for compilation thresholds has been tricky, so we're
still experimenting with the recompilation policy. Work on it
continues.
sounds like there is no such straigth forward path, it all depends...
Ok, its good, when
[Small methods that can be more easily analyzed, optimized, and inlined where necessary (and not inlined where not necessary). Clearly delineated uses of data so that usage patterns and lifetimes are apparent. ]
but when I read this:
[The virtual machine is responsible for byte code execution, storage allocation, thread synchronization, etc. Running with the virtual machine are native code libraries that handle input and output through the operating system, especially graphics operations through the window system. Programs that spend significant portions of their time in those native code libraries will not see their performance on HotSpot improved as much as programs that spend most of their time executing byte codes.]
I have the feeling that we might not able to improve performance that way?
Any comments?
otherwise i was wondering about
-XX:CompileThreshold=50 -Xmaxjitcodesize (large, how large?)
Somehow, we still feel that someone out there should have experienced similiar problems? But obviously there is no guarantee that the someone should surf by here!
In c++ we used to just write everything ourselves. Here it does seem to be a question about the right use of other peoples stuff?
Where you are kind of hoping for a shortcut, so you dont have to read endless number of documents, but can find a short document that actually addresses your problem ... well.
-Simon
Edited by: simoncpm on Mar 15, 2010 3:43 PM
Edited by: simoncpm on Mar 15, 2010 3:53 PM

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