ArrayIndexOutOfBoundsException while loading adapters.xml

emese

Hello,

I am encountering an exception that seems to be coming from Lightstreamer at startup, when the data adapters are being loaded.

I have checked adapters.xml with xmllint, and it is valid. I have also removed extra spaces as I seem to remember there were issues with that (like tag not ending on the same line).

I have some of the demo adapters installed and my own metadata adapter (1) and adapters (3).

My idea is that it has to do with the order things are happening in at startup (which seems to be different), because some of the time LS would startup without error, at other times there are 2 exceptions thrown, the arrayOutOfBounds exception's index is sometimes different.

Any hint of what I might do about this?

If you want to have a look at adapters.xml let me know. I wouldn't like to post it here, because it has jdbc auth info (a rather long jdbc string) in it (and if I remove it the problem might not be reproducible.)

Below is the log from LS.out:

03.Mar.11 13:50:05,337 < INFO> Started HTML Adaptor for JMX on port 6666
03.Mar.11 13:50:05,437 < INFO> Started JMXMP Connector for JMX on port 9999
03.Mar.11 13:50:05,658 < INFO> Loading Metadata Adapter CHAT
03.Mar.11 13:50:05,663 < INFO> Loading Data Adapter CHAT.CHAT_ROOM
03.Mar.11 13:50:05,664 < INFO> Loading Metadata Adapter FOI
03.Mar.11 13:50:05,666 < INFO> Loading Data Adapter FOI.FOI_TEST
03.Mar.11 13:50:05,669 < INFO> Loading Data Adapter FOI.FOI_ADAPTER2
03.Mar.11 13:50:05,672 < INFO> Loading Data Adapter FOI.FOI_ADAPTER
03.Mar.11 13:50:05,674 < INFO> Loading Metadata Adapter PORTFOLIODEMO
03.Mar.11 13:50:05,677 < INFO> Loading Data Adapter PORTFOLIODEMO.PORTFOLIO_ADAPTER
03.Mar.11 13:50:05,741 < INFO> FOITestDataAdapter ready
03.Mar.11 13:50:05,741 < INFO> Finished loading Data Adapter FOI.FOI_TEST
03.Mar.11 13:50:05,774 < INFO> PortfolioDataAdapter ready
03.Mar.11 13:50:05,775 < INFO> Finished loading Data Adapter PORTFOLIODEMO.PORTFOLIO_ADAPTER
03.Mar.11 13:50:05,780 < INFO> PortfolioMetadataAdapter ready
03.Mar.11 13:50:05,812 < INFO> Finished loading Metadata Adapter PORTFOLIODEMO
03.Mar.11 13:50:05,877 < INFO> ChatMetadataAdapter ready
03.Mar.11 13:50:05,878 < INFO> Finished loading Metadata Adapter CHAT
03.Mar.11 13:50:05,895 <ERROR> Data adapter FOI.FOI_ADAPTER init error
java.lang.ArrayIndexOutOfBoundsException: 16 >= 0
	at java.util.Vector.elementAt(Vector.java:427)
	at com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl.getNodeValueString(DeferredDocumentImpl.java:1167)
	at com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl.getNodeValueString(DeferredDocumentImpl.java:1120)
	at com.sun.org.apache.xerces.internal.dom.DeferredTextImpl.synchronizeData(DeferredTextImpl.java:93)
	at com.sun.org.apache.xerces.internal.dom.CharacterDataImpl.getData(CharacterDataImpl.java:160)
	at com.lightstreamer.h.g.a(g.java)
	at com.lightstreamer.k.z.a(z.java)
	at com.lightstreamer.k.z.a(z.java)
	at com.lightstreamer.k.z.b(z.java)
	at com.lightstreamer.k.m.a(m.java)
	at com.lightstreamer.h.b.run(b.java)
03.Mar.11 13:50:05,905 < INFO> ChatDataAdapter ready
03.Mar.11 13:50:05,978 < INFO> Finished loading Data Adapter CHAT.CHAT_ROOM
03.Mar.11 13:50:05,990 <ERROR> Error while loading the Adapters
java.lang.ArrayIndexOutOfBoundsException: 16 >= 0
	at java.util.Vector.elementAt(Vector.java:427)
	at com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl.getNodeValueString(DeferredDocumentImpl.java:1167)
	at com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl.getNodeValueString(DeferredDocumentImpl.java:1120)
	at com.sun.org.apache.xerces.internal.dom.DeferredTextImpl.synchronizeData(DeferredTextImpl.java:93)
	at com.sun.org.apache.xerces.internal.dom.CharacterDataImpl.getData(CharacterDataImpl.java:160)
	at com.lightstreamer.h.g.a(g.java)
	at com.lightstreamer.k.z.a(z.java)
	at com.lightstreamer.k.z.a(z.java)
	at com.lightstreamer.k.z.b(z.java)
	at com.lightstreamer.k.m.a(m.java)
	at com.lightstreamer.h.b.run(b.java)
03.Mar.11 13:50:06,013 <FATAL> Adapters initialization failed
03.Mar.11 13:50:06,013 < INFO> Exiting.....
03.Mar.11 13:50:07,032 < INFO> FOIMetaDataAdapter ready
03.Mar.11 13:50:07,033 < INFO> Finished loading Metadata Adapter FOI
03.Mar.11 13:50:07,296 < INFO> Record number:36
03.Mar.11 13:50:07,300 < INFO> Column number:10
03.Mar.11 13:50:07,310 < INFO> FOIDEparturesDataAdapter ready
03.Mar.11 13:50:07,310 < INFO> Finished loading Data Adapter FOI.FOI_ADAPTER2

Thanks for your help,
Emese, a fan of Lightstreamer :Smile_Ab:

Dario Crivelli

This is something really new for us.
The exceptions lie in the underlying xerces libraries and it is difficult for us to figure out what could be happening.

You say that the behavior is not always the same and may depend on the way things happen.
In fact, the Adapters are loaded in parallel, hence concurrent use of the xerces library code is possible.

So yes, please, show us your adapters.xml file through a private message.
Which version of the java runtime are you using?

Dario Crivelli

Ok, we have found out that the DOM interface does not require thread safe implementations, so the bug is in LS Server.
Probably, your jdbc string is so long that it exploits thread unsafety in the xerces library.
We will fix the issue in the next release.

For the moment, could we ask you to resort to an external file for supplying your string? The element in "adapters.xml" could just point to the file.
Sorry for letting you down.

emese

Hi Dario :Smile_Ab:

You guys are amazing :Smile_Ab: Indeed my jdbc string was rather long. I have rewritten the whole database stuff to use a db connection manager, and I am loading the settings from a properties file, no exceptions thrown since then.

Thanks for the quick reply, keep up the good work!