Thread: Java Error with irisFetch.Stations

Hi Brandon-

Thank you for this feedback. We're currently working to resolve this
issue. Tracking down the source of the problem (other than the fact that
we upgraded our Java platform) and why it's affecting MATLAB users only has
been tricky, but we're getting there. I am also conducting tests using the
IRIS-WS java library in hopes this might point to a solution for irisFetch
end users.

The feedback you provide below is useful, as the error pops up selectively
on certain station metadata, and we're trying to isolate what is special in
those cases.

So, this is station-level metadata that fits in a lat-lon box. It pulls
back a very big list, about 6MB in size.

I run the query like so:
http://service.iris.edu/fdsnws/station/1/query?net=*&level=station&minlat=38&maxlat=52&minlon=-131&maxlon=-115&nodata=404

These kinds of errors crop up when ampersand characters appear in XML but
are not properly formatted to represent special characters (entities).
These are like & for ampersand, > for greater-than, etc. So, this
XML does have a lot of ampersands in site descriptions, like PG&E and so
forth. In fact, I would guess that PG&E is the culprit, as this fits to
what I see in the error:

[com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character ' '
(code 32); expected a semi-colon after the reference for entity 'E'


The error appears 3 times, but it's all for the same position. This is
for station AE06, network GM. This station only has channels HH? and HN?,
so when you do your search, this station will come up. If you search on
BH? channels, this station will not appear.

What I cannot figure out is why I am seeing the string
<Description>PG&amp;E Dam</Description>
come back, which should be fine, when it looks like irisFetch is getting
back
<Description>PG&E Dam</Description>
which would trigger the unmarshalling error you are seeing.


I ran Java 8 and Java 11 runs of IRIS-WS which simulates
irisFetch.stations for station AE06, even printing out the Site details and
I can't seem to trigger a parsing error. What is notable is that I am
explicitly calling on JAXB libraries in my classpath and not falling back
on something that MATLAB or other utility might be using. I am hoping we
can test this on our instance of MATLAB to see if it makes a difference. I
don't have a license for it.

My classpath includes: ./IRIS-WS-2.0.19.jar
./javax.xml.bind-3.0-b71.jar
./jaxb-impl-2.3.1.jar
./jaxb-core-2.3.0.1.jar
./activation-1.0.2.jar

-Rob




On Sep 23, 2022, at 10:09 AM, Brandon VanderBeek (via IRIS) <
data-request-help-bounce<at>lists.ds.iris.edu> wrote:

I have recently encountered an error using irisFetch.Stations. Two days
ago (28-Aug-2022), I was able to run the following command without error,

S =
irisFetch.Stations('STATION','*','*','*','*','MinimumLatitude',38,'MaximumLatitude',52,'MinimumLongitude',-131,'MaximumLongitude',-115);

However, for the past two days this command has been giving the error
copied below. I'll note that requesting specifically the 'BHZ' channel
instead of the wildcard '*' runs without error while requesting
specifically the 'HHZ' channel will fail. Any thoughts?

Thanks for the help,
Brandon

Error using irisFetch/Networks/fetchTheStations (line 809)
Java exception occurred:
java.io.IOException: javax.xml.bind.UnmarshalException
- with linked exception:
[com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character ' '
(code 32); expected a semi-colon after the reference for entity 'E'
at [row,col {unknown-source}]: [4556,23]]
at
edu.iris.dmc.service.station.parser.StationXMLParser.parse(StationXMLParser.java:274)
at edu.iris.dmc.service.StationService.fetch(StationService.java:407)
at edu.iris.dmc.service.StationService.fetch(StationService.java:316)
at edu.iris.dmc.service.StationService.fetch(StationService.java:338)
Caused by: javax.xml.bind.UnmarshalException
- with linked exception:
[com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character ' '
(code 32); expected a semi-colon after the reference for entity 'E'
at [row,col {unknown-source}]: [4556,23]]
at
com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.handleStreamException(UnmarshallerImpl.java:470)
at
com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:448)
at
com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:415)
at
edu.iris.dmc.service.station.parser.StationXMLParser.parse(StationXMLParser.java:252)
... 3 more
Caused by: com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected
character ' ' (code 32); expected a semi-colon after the reference for
entity 'E'
at [row,col {unknown-source}]: [4556,23]
at
com.ctc.wstx.sr.StreamScanner.throwUnexpectedChar(StreamScanner.java:648)
at com.ctc.wstx.sr.StreamScanner.parseEntityName(StreamScanner.java:1994)
at
com.ctc.wstx.sr.StreamScanner.fullyResolveEntity(StreamScanner.java:1496)
at
com.ctc.wstx.sr.BasicStreamReader.readTextSecondary(BasicStreamReader.java:4681)
at
com.ctc.wstx.sr.BasicStreamReader.readCoalescedText(BasicStreamReader.java:4126)
at
com.ctc.wstx.sr.BasicStreamReader.finishToken(BasicStreamReader.java:3701)
at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1023)
at com.ctc.wstx.evt.WstxEventReader.nextEvent(WstxEventReader.java:196)
at
com.sun.xml.internal.bind.v2.runtime.unmarshaller.StAXEventConnector.bridge(StAXEventConnector.java:131)
at
com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:445)
... 5 more

Error in irisFetch.Networks (line 713)
fetchTheStations();

Error in irisFetch.Stations (line 639)
[stationStructure, urlParams] =
irisFetch.Networks(detailLevel,varargin{:});

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