SAX XML Parsing and Garbage Collection

I'm writing an XML parser that is running extremely slow while parsing large documents, I believe due to garbage collection. The implementation just overloads the DefaultHandler and hands that to a SAX Parser. This works fine on 2500 line XML document, taking on average a second or two, but becomes untennable when the document size is increased by a factor of 10 (often taking 5+ minutes).
I come from a C++ background and haven't dealt with automatic garbage collection at an expert level, so I'd appreciate any help. Below is a snapshot garbage collection done while a 25000 line document being parsed. It looks to me as the young objects are staying small, but older objects are going between 13M and 90M and back again. Is that what's happening? Can anyone give me leads as to what to look? Thanks in advance.
[GC [DefNew: 6234K->0K(7168K), 0.0057359 secs] 15517K->13022K(101696K), 0.0057907 secs]
[GC [DefNew: 6235K->0K(7168K), 0.0057748 secs] 19257K->16762K(101696K), 0.0060357 secs]
[GC [DefNew: 6235K->0K(7168K), 0.0023584 secs] 22997K->18009K(101696K), 0.0024123 secs]
[GC [DefNew: 6236K->0K(7168K), 0.0040785 secs] 24245K->20502K(101696K), 0.0041315 secs]
[GC [DefNew: 4990K->0K(7168K), 0.0041025 secs] 25492K->22996K(101696K), 0.0041544 secs]
[GC [DefNew: 4990K->0K(7168K), 0.0041486 secs] 27987K->25491K(101696K), 0.0042022 secs]
[GC [DefNew: 4991K->0K(7168K), 0.0040782 secs] 30481K->27985K(101696K), 0.0041299 secs]
[GC [DefNew: 4991K->0K(7168K), 0.0040935 secs] 32976K->30479K(101696K), 0.0046294 secs]
[GC [DefNew: 4991K->0K(7168K), 0.0041433 secs] 35471K->32974K(101696K), 0.0041958 secs]
[GC [DefNew: 4992K->0K(7168K), 0.0041114 secs] 37966K->35469K(101696K), 0.0041634 secs]
[GC [DefNew: 6240K->0K(7168K), 0.0024190 secs] 41709K->36717K(101696K), 0.0024729 secs]
[GC [DefNew: 6240K->0K(7168K), 0.0041377 secs] 42957K->39212K(101696K), 0.0041972 secs]
[GC [DefNew: 4993K->0K(7168K), 0.0041234 secs] 44205K->41707K(101696K), 0.0041762 secs]
[GC [DefNew: 4993K->0K(7168K), 0.0042827 secs] 46701K->44203K(101696K), 0.0046299 secs]
[GC [DefNew: 4994K->0K(7168K), 0.0043195 secs] 49197K->46699K(101696K), 0.0043751 secs]
[GC [DefNew: 4994K->0K(7168K), 0.0042740 secs] 51693K->49195K(101696K), 0.0043293 secs]
[GC [DefNew: 4995K->0K(7168K), 0.0042044 secs] 54190K->51692K(101696K), 0.0042575 secs]
[GC [DefNew: 4995K->0K(7168K), 0.0042237 secs] 56686K->54188K(101696K), 0.0042762 secs]
[GC [DefNew: 4996K->1K(7168K), 0.0040036 secs] 59183K->56685K(101696K), 0.0040550 secs]
[GC [DefNew: 4996K->1K(7168K), 0.0042095 secs] 61680K->59182K(101696K), 0.0045992 secs]
[GC [DefNew: 4997K->1K(7168K), 0.0042193 secs] 64178K->61679K(101696K), 0.0042715 secs]
[GC [DefNew: 4997K->1K(7168K), 0.0042301 secs] 66675K->64176K(101696K), 0.0042818 secs]
[GC [DefNew: 4997K->1K(7168K), 0.0042726 secs] 69173K->66674K(101696K), 0.0043251 secs]
[GC [DefNew: 4998K->1K(7168K), 0.0042564 secs] 71671K->69172K(101696K), 0.0043084 secs]
[GC [DefNew: 4998K->1K(7168K), 0.0040301 secs] 74169K->71669K(101696K), 0.0040812 secs]
[GC [DefNew: 4999K->1K(7168K), 0.0042656 secs] 76668K->74168K(101696K), 0.0047255 secs]
[GC [DefNew: 4999K->1K(7168K), 0.0043100 secs] 79166K->76666K(101696K), 0.0043737 secs]
[GC [DefNew: 5000K->1K(7168K), 0.0043492 secs] 81665K->79165K(101696K), 0.0044034 secs]
[GC [DefNew: 5000K->1K(7168K), 0.0043165 secs] 84164K->81664K(101696K), 0.0043693 secs]
[GC [DefNew: 5001K->1K(7168K), 0.0044196 secs] 86663K->84163K(101696K), 0.0044735 secs]
[GC [DefNew: 5001K->1K(7168K), 0.0044439 secs] 89163K->86662K(101696K), 0.0044967 secs]
[GC [DefNew: 5001K->1K(7168K), 0.0043983 secs] 91662K->89161K(101696K), 0.0045313 secs]
[GC [DefNew: 5002K->1K(7168K), 0.0043422 secs] 94162K->91661K(101696K), 0.0043944 secs]
[GC [DefNew: 5002K->1K(7168K), 0.0044223 secs] 96662K->94160K(101696K), 0.0044757 secs]
[GC [DefNew: 5002K->1K(7168K), 0.0048545 secs][Tenured: 96659K->9291K(97032K), 0.0863445 secs] 99162K->9291K(104200K), 0.0913954 secs]

I don't think I'm creating megabytes of data, not using hashes or other expandable arrays. I've copied and pasted some code from my overriding of a DefaultHandler to give better definition to the problem.
I'm working with TPTP right now as a profiler. Are there any others you'd recommend?
     public void startElement(String uri, String localname, String qName, Attributes attribs)
     throws SAXException
          if(qName.equals("Line"))
               attributes = attribs;
          else if(qName.equals("Note"))
               attributes = attribs;
          else if(qName.equals("Selection"))
               String idValue = attribs.getValue("id");
               String oValue = attribs.getValue("off");
               String lValue = attribs.getValue("len");
               if(idValue != null && oValue != null && lValue != null)
                    if(isImport)
                         issueSelectionContainer.addUnloadedSelection(Integer.parseInt(idValue), Integer.parseInt(oValue), Integer.parseInt(lValue));
                    else
                         issueSelectionContainer.addSelection(Integer.parseInt(idValue), Integer.parseInt(oValue), Integer.parseInt(lValue));
          else if(qName.equals("Issue"))
               attributes = attribs;
          if(qName.equals("IsFinal"))
               isFinal = true;
     public void endElement(String uri, String localname, String qName)
     throws SAXException
          if(textElement.length() > 0)
               if(qName.equals("Line"))
                    String qmValue = attributes.getValue("qm");
                    String lnValue = attributes.getValue("ln");
                    String pgValue = attributes.getValue("pg");
                    boolean qm = (qmValue != null && qmValue.equalsIgnoreCase("true"));
                    short ln = (lnValue != null) ? Short.parseShort(lnValue) : 0;
                    short pg;
                    if(pgValue != null)
                         pg = Short.parseShort(pgValue);
                         page = pg;
                    else
                         pg = page;
                    lineContainer.addLine(textElement + '\n', ln, pg, qm, null);
               else if(qName.equals("Note"))
                    String lnValue = attributes.getValue("line");
                    if(lnValue != null)
                         int line = Integer.parseInt(lnValue);
                         try
                              lineContainer.getLine(line).setNote(textElement);
                         catch (IndexOutOfBoundsException e)
                              throw new SAXException("XML/Data mismatch. Note on line \"" + line + "\" out of \"" + lineContainer.lineCount() + "\" lines", e);
               else if(qName.equals("Issue") && isImport)
                    String idValue = attributes.getValue("id");
                    String cValue = attributes.getValue("color");
                    if(idValue != null && cValue != null)
                         issueSelectionContainer.addUnloadedIssueSelection(Integer.parseInt(idValue), new Color(Integer.parseInt(cValue)), textElement);
               else if(qName.equals("Name"))
                    name = textElement;
               else if(qName.equals("Description"))
                    description = textElement;
               else if(qName.equals("CreationDate"))
                    date = getCalendarFromString(textElement);
               textElement = "";
               attributes = null;
     public void characters(char buf[], int offset, int len)
    throws SAXException
          textElement = new String(buf, offset, len);
    }

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          <page>
               
               <xsl:copy-of select="xalan:checkEnvironment()"/>
               
               <meta>
                    <cols>
                         <xsl:apply-templates select="$table/sql/metadata/column-header"/>
                    </cols>
               </meta>
               <rowset>
                    
                    <xsl:apply-templates select="$table/sql/row-set"/>
               </rowset>
          </page>
          <xsl:value-of select="sql:close($connection)"/>
     </xsl:template>
     <xsl:template match="row">
          <row>
               <xsl:apply-templates select="col"/>
          </row>
     </xsl:template>
     <xsl:template match="column-header">
          <col>
               <xsl:attribute name="type">
                    <xsl:value-of select="@column-typename"/>
               </xsl:attribute>
               <xsl:attribute name="display-name">
                    <xsl:call-template name="create-display-name"/>
               </xsl:attribute>
               <xsl:value-of select="@column-name"/>
          </col>
     </xsl:template>
     
     <xsl:template name="create-display-name">
          <xsl:variable name="col-name">
               <xsl:for-each select="str:tokenize(@column-name, '_')">
                    <xsl:value-of
                         select="concat(translate(substring(., 1, 1), $lowercase, $uppercase), translate(substring(.,2), $uppercase, $lowercase), ' ')"/>
               </xsl:for-each>
          </xsl:variable>
          <xsl:value-of select="substring($col-name, 1, string-length($col-name) - 1)"/>
     </xsl:template>
     
     <xsl:template match="col">
          <col>
               <xsl:attribute name="column-name"><xsl:value-of select="@column-name"/></xsl:attribute>
               <xsl:value-of select="."/>
          </col>
     </xsl:template>
</xsl:stylesheet>

A website I need to get information from returns a message stating that I do not have the most recent XML parser, and suggests using IE 5.5 or newer. This, of course, I have no intention of doing. Any suggestions?

This is supposed to be an animated Help page. However, when Itry to click on it, it gives me the message:
Your browser does not seem to have the most updated XML parser.
Please use Microsoft Internet Explorer 5.5 or up for PointingTheWay features.
System Can Not Proceed any further.

Unfortunately, it's a member-only page, with member id and password required. I'm trying to contact their IT dept., but without much luck, so far!

Remove / unload external swf file(s) from the main flash file and load a new swf file and garbage collection from memory.

I can't seem to remove / unload the external swf files e.g when the carousel.swf (portfolio) is displayed and I press the about button the about content is overlapping the carousel (portfolio) . How can I remove / unload an external swf file from the main flash file and load a new swf file, while at the same time removing garbage collection from memory?
This is the error message(s) I am receiving: "TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/removeChild()
at index_fla::MainTimeline/Down3()"
import nl.demonsters.debugger.MonsterDebugger;
var d:MonsterDebugger=new MonsterDebugger(this);
stage.scaleMode=StageScaleMode.NO_SCALE;
stage.align=StageAlign.TOP_LEFT;
stage.addEventListener(Event.RESIZE, resizeHandler);
// loader is the loader for portfolio page swf
var loader:Loader;
var loader2:Loader;
var loader3:Loader;
var loader1:Loader;
// resize content
function resizeHandler(event:Event):void {
    // resizes portfolio page to center
loader.x = (stage.stageWidth - loader.width) * .5;
loader.y = (stage.stageHeight - loader.height) * .5;
// resizes about page to center
loader3.x = (stage.stageWidth - 482) * .5 - 260;
loader3.y = (stage.stageHeight - 492) * .5 - 140;
/*loader2.x = (stage.stageWidth - 658.65) * .5;
loader2.y = (stage.stageHeight - 551.45) * .5;*/
addEventListener(Event.ENTER_FRAME, onEnterFrame,false, 0, true);
function onEnterFrame(ev:Event):void {
var requesterb:URLRequest=new URLRequest("carouselLoader.swf");
loader = null;
loader = new Loader();
loader.name ="carousel1"
//adds gallery.swf to stage at begining of movie
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader.load(requesterb);
} catch (error:SecurityError) {
trace(error);
addChild(loader);
loader.x = (stage.stageWidth - 739) * .5;
loader.y = (stage.stageHeight - 500) * .5;
// stop gallery.swf from duplication over and over again on enter frame
removeEventListener(Event.ENTER_FRAME, onEnterFrame);
//PORTFOLIO BUTTON
//adds eventlistner so that gallery.swf can be loaded
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
function Down(event:MouseEvent):void {
// re adds listener for contact.swf and about.swf
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
//unloads gallery.swf from enter frame if users presses portfolio button in nav
var requester:URLRequest=new URLRequest("carouselLoader.swf");
    loader = null;
loader = new Loader();
loader.name ="carousel"
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader);
loader.x = (stage.stageWidth - 739) * .5;
loader.y = (stage.stageHeight - 500) * .5;
removeChild( getChildByName("about") );
removeChild( getChildByName("carousel1") );
// remove eventlistner and prevents duplication of gallery.swf
MovieClip(root).nav.portfolio.removeEventListener(MouseEvent.MOUSE_DOWN, Down);
//INFORMATION BUTTON
//adds eventlistner so that info.swf can be loaded
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
function Down1(event:MouseEvent):void {
//this re-adds the EventListener for portfolio so that end user can view again if they wish.
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
var requester:URLRequest=new URLRequest("contactLoader.swf");
loader2 = null;
loader2 = new Loader();
loader2.name ="contact"
loader2.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader2.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader2);
loader2.x = (stage.stageWidth - 658.65) * .5;
loader2.y = (stage.stageHeight - 551.45) * .5;
// remove eventlistner and prevents duplication of info.swf
MovieClip(root).nav.info.removeEventListener(MouseEvent.MOUSE_DOWN, Down1);
//ABOUT BUTTON
//adds eventlistner so that info.swf can be loaded
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
function Down3(event:MouseEvent):void {
//this re-adds the EventListener for portfolio so that end user can view again if they wish.
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
var requester:URLRequest=new URLRequest("aboutLoader.swf");
loader3 = null;
loader3 = new Loader();
loader3.name ="about"
loader3.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader3.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader3);
loader3.x = (stage.stageWidth - 482) * .5 - 260;
loader3.y = (stage.stageHeight - 492) * .5 - 140;
removeChild( getChildByName("carousel") );
removeChild( getChildByName("carousel1") );
// remove eventlistner and prevents duplication of info.swf
MovieClip(root).nav.about.removeEventListener(MouseEvent.MOUSE_DOWN, Down3);
stop();

Andrei1,
Thank you for the helpful advice. I made the changes as you suggested but I am receiving a #1009 error message even though my site is working the way I wan it to work. I would still like to fix the errors so that my site runs and error free. This is the error I am receiving:
"TypeError: Error #1009: Cannot access a property or method of a null object reference."
I'm sure this is not the best method to unload loaders and I am guessing this is why I am receiving the following error message.
     loader.unload();
     loader2.unload();
     loader3.unload();
I also tried creating a function to unload the loader but received the same error message and my portfolio swf was not showing at all.
     function killLoad():void{
     try { loader.close(); loader2.close; loader3.close;} catch (e:*) {}
     loader.unload(); loader2.unload(); loader3.unload();
I have a question regarding suggestion you made to set Mouse Event to "null". What does this do setting the MouseEvent do exactly? Also, since I've set the MouseEvent to null do I also have to set the loader to null? e.g.
---- Here is my updated code ----
// variable for external loaders
var loader:Loader;
var loader1:Loader;
var loader2:Loader;
var loader3:Loader;
// makes borders resize with browser size
function resizeHandler(event:Event):void {
// resizes portfolio page to center
     loader.x = (stage.stageWidth - loader.width) * .5;
     loader.y = (stage.stageHeight - loader.height) * .5;
// resizes about page to center
     loader3.x = (stage.stageWidth - 482) * .5 - 260;
     loader3.y = (stage.stageHeight - 492) * .5 - 140;
//adds gallery.swf to stage at begining of moviie
     Down();
//PORTFOLIO BUTTON
//adds eventlistner so that gallery.swf can be loaded
     MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
function Down(event:MouseEvent = null):void {
// re adds listener for contact.swf and about.swf
     MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
     MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
//unloads gallery.swf from enter frame if users presses portfolio button in nav
     var requester:URLRequest=new URLRequest("carouselLoader.swf");
     loader = new Loader();
     loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
     function ioError(event:IOErrorEvent):void {
     trace(event);
     try {
     loader.load(requester);
     } catch (error:SecurityError) {
     trace(error);
     this.addChild(loader);
     loader.x = (stage.stageWidth - 739) * .5;
     loader.y = (stage.stageHeight - 500) * .5;
// sure this is not the best way to do this - but it is unload external swfs
     loader.unload();
     loader2.unload();
     loader3.unload();
// remove eventlistner and prevents duplication of gallery.swf
     MovieClip(root).nav.portfolio.removeEventListener(MouseEvent.MOUSE_DOWN, Down);
//INFORMATION BUTTON
     //adds eventlistner so that info.swf can be loaded
     MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
     function Down1(event:MouseEvent = null):void {
     //this re-adds the EventListener for portfolio so that end user can view again if they wish.
     MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
     MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
     var requester:URLRequest=new URLRequest("contactLoader.swf");
     loader2 = null;
     loader2 = new Loader();
     loader2.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
     function ioError(event:IOErrorEvent):void {
     trace(event);
     try {
     loader2.load(requester);
}      catch (error:SecurityError) {
     trace(error);
     addChild(loader2);
     loader2.x = (stage.stageWidth - 658.65) * .5;
     loader2.y = (stage.stageHeight - 551.45) * .5;
loader.unload();
loader2.unload();
loader3.unload();
     // remove eventlistner and prevents duplication of info.swf
     MovieClip(root).nav.info.removeEventListener(MouseEvent.MOUSE_DOWN, Down1);
//ABOUT BUTTON
     //adds eventlistner so that info.swf can be loaded
     MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
     function Down3(event:MouseEvent = null):void {
     //this re-adds the EventListener for portfolio so that end user can view again if they wish.
     MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
     MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
     var requester:URLRequest=new URLRequest("aboutLoader.swf");
     loader3 = null;
     loader3 = new Loader();
     loader3.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
     function ioError(event:IOErrorEvent):void {
     trace(event);
     try {
     loader3.load(requester);
}      catch (error:SecurityError) {
     trace(error);
     addChild(loader3);
     loader3.x = (stage.stageWidth - 482) * .5 - 260;
     loader3.y = (stage.stageHeight - 492) * .5 - 140;
     loader.unload();
     loader2.unload();
     loader3.unload();
     // remove eventlistner and prevents duplication of info.swf
     MovieClip(root).nav.about.removeEventListener(MouseEvent.MOUSE_DOWN, Down3);
     stop();

Xml parsing and report generation probs

Hello everyone,
I am facing with a peculiar problem.
I have an xml which contains special characters like �( cent) . So I parse it before i send it to the DOM parser. BufferedReader br = new BufferedReader(new InputStreamReader(inputFileName,"ISO-8859-1"));
and i have a function which replaces the cent with #xA2; .After i replace the special chars , i pass it to the parse method and i have some classes which update the database.the whole process works fine.
Now I have a report generation where i generate an HTML passing the string after the values are updated in the DB . So when i pass the string , and replace #xA2 with cent symbol, it is being interrupted as '?' in the windows and unix environment
This is something to do with the encoding.But my encoding is ISO-8859-1 as mentioned
Can you please help me out with this prob
Regards
KV

I have some sympathy with you because I had problems with the cent sign in the XML world too. But not much... you have XML parsing going on, you're writing to a database, you're generating HTML, you have a manual hack for the cent sign. One or more of these things is causing you a problem. Do not try to test them all at once, like you are doing. Test only one thing at a time.

Oracle XML parser and IBM jdk bug

Hello,
From a few messages found in the XML forum it seems that IBM jvm could cause problems with oracle XML parser. ( see http://technet.oracle.com:89/ubb/Forum11/HTML/003823.html )
I am using IBM jvm (jdk 1.3) on a linux box, and problems are starting to arise:
I have
- 1 BC4J based jsp app which works fine.
- 2 XML parsing BC4J apps which cause strange errors (like parsing 40 documents fine and failing on the 41st for no apparent reason)
Hopefully, Steven Muench provided precious advice on this (basically, disabling the JIT), however some issues are still open:
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>You should file a bug with IBM to get this fixed, using your stylesheet as a testcase. Lots of people have hit this problem.<HR></BLOCKQUOTE>
Has anyone (from oracle or else) done this yet? I have gone (quickly) through IBM website but I didn't find any bug report utility or the like...
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Disable your JIT compiler (or switch JVM's) and you won't have the error.<HR></BLOCKQUOTE>
Turning off the JIT indeed made the errors vanish, thanks a lot for the tip!
I have a few more questions though :
* As the BC4J framework uses the xml parser, It is fairly possible that the ibm jvm bug will affect it...
I haven't had any problems (yet?) with the BC4J part of my applications, but I'm a bit concerned about having random bugs lurking around (I have more than enough of my own :) )
Has anyone stumbled upon IBM JVM vs oracle parser issues in BC4J? (oracle.xml.parser.v2.XXXXXX exceptions...)
* If BC4J is indeed affected, what's the solution?
- Disable the JIT? (And forget about performance?... hmmm... no)
- Switch parsers? (oracle parser is too tightly integrated in the BC4J Framework isn't it?.. hmm... not possible either)
- Wait for a patch from IBM (and use another one in the meantime) / switch JVM :
In either case, I'd really like to know what is the JVM that oracle people use / would advise.
Thanks for your help
null

For those interested,
last week i reported this bug in the ibm jvm news forum.
They said that the problem had been investigated and would be fixed in their next service release.
FYI: the current release (SR7, labeled "build cx130-20010329) still has various problems wih oracle XML parser.
Remi
null

A question about JNI references, persistence, and garbage collection

I am writing a library to allow our Java developers to access C functions in our product. I want people on the Java side to be able to instantiate instances of a new object (on the C side), say "Map", and I want those objects to persist until they are destroyed on the Java side. I am thinking of creating a wrapper for the native methods, which stores an identifier for the instance of an object. When the C object is accessed, the identifier is passed to the C code which looks up the correct object in a table. I understand that if I use the NewGlobalReference call in JNI I can get objects to persist.
When it is time for garbage collection I plan to override finalize() to call the C code and tell it to remove the Global Reference.
Here's what I have in mind
public class JMap() {
     private static int id;
     static {
          System.loadLibrary("libMap");
          /*Call C method which instantiates object and creates a GlobalReference
          which is stored in table. Returns ID for reference*/
          id = _init();
     public void setSize(int x, int y) {
          _setSize(id, x, y);
     public void finalize() {
          _finalize(id);
          super.finalize();
     private native int _init();
     /*calls DeleteGlobalReference for the reference matching this id*/
     private native void _finalize(int id);
     private native void _setSize(int id, int x, int y);
}Is this the right thing to do? Have I understood the way JNI works with regard to GlobalReferences?
Any comments, tips or pointers would be appreciated :)

This probably should have been posted in the Native Methods sub-forum, I have reposted there:
http://forum.java.sun.com/thread.jspa?threadID=657667
Mods please delete this post :)

Oracle XML parser and schema validation

Hi Forum,
I have problem parsing XML with validation against XML schema. I define location of schema (URL) in xml file and Oracle parser could not find the schema (xml file is correct - checked in other programs). When I point to xml schema directly from Java (using parser.setXMLSchema) before calling parser.parse, it works just fine. Where is the problem? Does oracle parser works correctly with XML Schema?
TIA,
Alex

SAXParser saxParser=new SAXParser();
saxParser.setValidationMode(XMLParser.SCHEMA_VALIDATION);
Specify a Schema to validate a XML document with, for the SAXParser.
saxParser.setXMLSchema(SchemaUrl);
DefaultHandler handler=new DefaultHandler();
saxParser.setErrorHandler(handler);
Parse the XML document to validate with the XML schema.
saxParser.parse(XmlDocumentUrl);

Aggressive Heap and garbage collection in 1.4.2

We are trying to monitor the memory usage and the garbage collection for one of our application servers. We are using JDK 1.4.2 b-19 on solaris 8. The machine has 4 900 Mhz CPUs and 8GB ram. The VM options are:
-server -XX:+AggressiveHeap -Xms3512m -Xmx3512m -verbose:gc
-XX:+PrintHeapAtGC -XX:+PrintTenuringDistribution -XX:+PrintGCTimestamps.The first full GC kicks in when the old generation gets full which is understandable. After that however, the full gc kicks in much more frequently and even the gc pauses are fairly long. Below are some of the output from gc.
For the first GC the old generation was almost full.
PSYoungGen total 1379840K, used 1324288K
PSOldGen total 2123648K, used 2103378K
For the second GC, young generation is 25MB out of 1300MB and old generation is 1100MB out of 2100MB. Still the full gc kicked in and took 23 secs.
PSYoungGen total 1356608K, used 25856K
PSOldGen total 2123648K, used 1169626K
I understand that the adaptive sizing is kicking in (by default) but it should make life better not worse. If the full GC could wait till the old generation gets full again, I will get lesser number of full gc pauses and few and far in between.
Any idea as to what I can do?
thanks
vinay
{Heap before GC invocations=108:
Heap
PSYoungGen      total 1379840K, used 1324288K [0x1a000000, 0x73e20000, 0x73e20000)
eden space 228096K, 100% used [0x1a000000,0x27ec0000,0x27ec0000)
from space 1151744K, 95% used [0x27ec0000,0x6ad40000,0x6e380000)
to   space 92800K, 0% used [0x6e380000,0x6e380000,0x73e20000)
PSOldGen        total 2123648K, used 2103378K [0x73e20000, 0xf5800000, 0xf5800000)
object space 2123648K, 99% used [0x73e20000,0xf4434af8,0xf5800000)
PSPermGen       total 31872K, used 31768K [0xf5800000, 0xf7720000, 0xf9800000)
object space 31872K, 99% used [0xf5800000,0xf7706200,0xf7720000)
2842.142: [Full GC 3427666K->1083494K(3503488K), 26.6495189 secs]
Heap after GC invocations=108:
Heap
PSYoungGen      total 1379840K, used 0K [0x1a000000, 0x73e20000, 0x73e20000)
eden space 1287040K, 0% used [0x1a000000,0x1a000000,0x688e0000)
from space 92800K, 0% used [0x6e380000,0x6e380000,0x73e20000)
to   space 92800K, 0% used [0x688e0000,0x688e0000,0x6e380000)
PSOldGen        total 2123648K, used 1083494K [0x73e20000, 0xf5800000, 0xf5800000)
object space 2123648K, 51% used [0x73e20000,0xb6039978,0xf5800000)
PSPermGen       total 63744K, used 31768K [0xf5800000, 0xf9640000, 0xf9800000)
object space 63744K, 49% used [0xf5800000,0xf7706200,0xf9640000)
{Heap before GC invocations=114:
Heap
PSYoungGen      total 1356608K, used 25856K [0x1a000000, 0x73e20000, 0x73e20000)
eden space 1240576K, 0% used [0x1a000000,0x1a000000,0x65b80000)
from space 116032K, 22% used [0x6ccd0000,0x6e610000,0x73e20000)
to   space 116032K, 0% used [0x65b80000,0x65b80000,0x6ccd0000)
PSOldGen        total 2123648K, used 1169626K [0x73e20000, 0xf5800000, 0xf5800000)
object space 2123648K, 55% used [0x73e20000,0xbb456858,0xf5800000)
PSPermGen       total 65536K, used 31773K [0xf5800000, 0xf9800000, 0xf9800000)
object space 65536K, 48% used [0xf5800000,0xf7707578,0xf9800000)
3153.022: [Full GC 1195482K->1149586K(3482688K), 23.3155823 secs]
Heap after GC invocations=114:
Heap
PSYoungGen      total 1359040K, used 0K [0x1a000000, 0x73e20000, 0x73e20000)
eden space 1245440K, 0% used [0x1a000000,0x1a000000,0x66040000)
from space 113600K, 0% used [0x6cf30000,0x6cf30000,0x73e20000)
to   space 113600K, 0% used [0x66040000,0x66040000,0x6cf30000)
PSOldGen        total 2123648K, used 1149586K [0x73e20000, 0xf5800000, 0xf5800000)
object space 2123648K, 54% used [0x73e20000,0xba0c4830,0xf5800000)
PSPermGen       total 65536K, used 31773K [0xf5800000, 0xf9800000, 0xf9800000)
object space 65536K, 48% used [0xf5800000,0xf7707578,0xf9800000)
}

We also had similar issues...If you are using RMI it might cause Full GC. This is the snippet from http://java.sun.com/docs/hotspot/gc/
<snip>
Garbage can't be collected in these distributed applications without occasional local collection, so RMI forces periodic full collection. The frequency of these collections can be controlled with properties. For example,
java -Dsun.rmi.dgc.client.gcInterval=3600000
-Dsun.rmi.dgc.server.gcInterval=3600000
</snip>
By default this is 1 min. So try changing this and try it out.

SAX XML Parsing and Garbage Collection

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