Hi,
I'm building an application with the Tapestry 4.0.2 framework, which
manages my music-collection. I'm getting OutOfMemoryErrors since I've
created a small ajax-ish component that refreshes every 10 seconds to
show the song that is currently playing. A piece of javascript gets the
Tapestry-page with the currently-playing song on it, and puts the
generated html into a <div>. After 24 hours or so making these
page-requests, an out of memory error occurs.
I have the feeling that this new auto-refreshing component of mine only
quickens the OutOfMemoryError, since I did get these errors before, but
only after much longer uptimes.
What am I doing wrong here? Is it the Spring OpenSessionInView-filter
that I use that is wasting memory, am I not cleaning-up everything
myself? Should I use Tapestry 4.1.1? Can anybody help? The code of the
page follows:
(You can also have a look at
http://musicontroller.cvs.sourceforge.net/musicontroller/ for more
sourcecode)
Thanks,
~Arjan Verstoep
public abstract class CurrentlyPlaying extends BasePage {
public abstract SessionUserState getSessionUserState();
public abstract Dao getDao();
private Song _song = null;
public Song getCurrentSong() {
if (_song==null) {
_song =
getDao().getSongById(getSessionUserState().getDJ().getCurrentSongId());
}
return _song;
}
public void finishLoad() {
super.finishLoad();
_song = null;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE page-specification PUBLIC
"-//Apache Software Foundation//Tapestry Specification 4.0//EN"
"http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd";>
<page-specification class="org.musicontroller.gui.dynamic.CurrentlyPlaying">
<inject property="sessionUserState" type="state"
object="sessionUserState"/>
<inject property="dao" object="spring:dao"/>
<component id="ifPlaying" type="If">
<binding name="condition" value="getCurrentSong()!=null"/>
</component>
<component id="songName" type="Insert">
<binding name="value" value="ognl:currentSong.name"/>
</component>
<component id="band" type="components/BandLink">
<binding name="band" value="ognl:currentSong.getBand()"/>
<!-- Why doesn't currentSong.band work?? -->
</component>
</page-specification>
<body jwcid="@Body">
<span jwcid="$content$">
<span jwcid="ifPlaying">
<span jwcid="band"/> - <span jwcid="songName"/>
</span>
</span>
</body>
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