[Proj4j] Conversion issue

Gertjan Idema g.idema at zonnet.nl
Mon Oct 22 04:23:17 PDT 2012 

On Mon, 2012-10-22 at 12:31 +0200, P. Peterse (HDB) wrote:

> Martin,
> 
> can it be that the class Proj4Keyword also need to be synchronized?
> 

Did you try running the code without the 'towgs84' parameter? If you get
the same error, but for the 'proj' parameter, that would support the
theory that your dealing with a synchronization problem.
'towgs84' just happens to be the first parameter to be checked. The next
would be 'proj', at least on my JVM.

In this case, I think the Proj4Keyword.supportedParameters() method
should be synchronized, but I'm not really a multithreading expert.

Groeten, Gertjan


> Regards,
> Peter
> 
> Op 22-10-2012 11:55, P. Peterse (HDB) schreef:
> > Hello Martin,
> >
> > I updated the proj4j package and using this library in our project.
> >
> > unfortunately the error still exists:
> > ============
> > towgs84 parameter is not supported
> > org.osgeo.proj4j.UnsupportedParameterException: towgs84 parameter is not
> > supported
> >     at
> > org.osgeo.proj4j.parser.Proj4Keyword.checkUnsupported(Proj4Keyword.java:108)
> >     at
> > org.osgeo.proj4j.parser.Proj4Keyword.checkUnsupported(Proj4Keyword.java:115)
> >     at org.osgeo.proj4j.parser.Proj4Parser.parse(Proj4Parser.java:34)
> >     at org.osgeo.proj4j.CRSFactory.createFromParameters(CRSFactory.java:120)
> >     at org.osgeo.proj4j.CRSFactory.createFromParameters(CRSFactory.java:98)
> >     at com.hdb.tol.wms.RDConverter.convert2WGS84(RDConverter.java:114)
> > ============
> > Is this an other issue with an other race condition?
> >
> > One of your questions was:
> >
> > Are you using the codein a multithreaded context?  
> >
> > This is true, our project is using multiple threads.
> >
> > Regards,
> > Peter
> >
> > Op 22-10-2012 9:47, P. Peterse (HDB) schreef:
> >> Hello Martin,
> >>
> >> I've just update the proj4j code. And start trying it in our code.
> >> I will let you now if it will work.
> >>
> >> Thanks for digging in to the code.
> >>
> >> Regards,
> >> Peter
> >>
> >> Op 19-10-2012 19:52, Martin Davis schreef:
> >>> I just committed a patch to the Registry which should avoid potential
> >>> race conditions during initialization.
> >>>
> >>> Also, the idea about conflicting JARs is a good thing to look at too. 
> >>> Ah, the joys of Java classloaders...
> >>>
> >>> On 10/19/2012 8:36 AM, Martin Davis wrote:
> >>>> Not sure why this would be a transient error.  Are you using the code
> >>>> in a multithreaded context?  It's possible there's a race condition in
> >>>> the Registry initialization.  If you can recompile the code, try
> >>>> changing the initialize method in Registry.java to:
> >>>>
> >>>>    private synchronized void initialize() {
> >>>>
> >>>> M
> >>>>
> >>>> On Fri, Oct 19, 2012 at 6:14 AM, P. Peterse (HDB)
> >>>> <p.peterse at han-dataport.nl> wrote:
> >>>>> Hello,
> >>>>>
> >>>>> here is the stack trace from my code:
> >>>>> ===============
> >>>>> org.osgeo.proj4j.InvalidValueException: Unknown projection: sterea
> >>>>>      at
> >>>>> org.osgeo.proj4j.parser.Proj4Parser.parseProjection(Proj4Parser.java:71)
> >>>>>
> >>>>>      at org.osgeo.proj4j.parser.Proj4Parser.parse(Proj4Parser.java:43)
> >>>>>      at
> >>>>> org.osgeo.proj4j.CRSFactory.createFromParameters(CRSFactory.java:120)
> >>>>>      at
> >>>>> org.osgeo.proj4j.CRSFactory.createFromParameters(CRSFactory.java:98)
> >>>>>      at com.hdb.tol.wms.RDConverter.convert2WGS84(RDConverter.java:114)
> >>>>> ===============
> >>>>>
> >>>>> What can I check?
> >>>>>
> >>>>> Thanks for any reply.
> >>>>> Peter
> >>>>>
> >>>>> Op 19-10-2012 10:40, P. Peterse (HDB) schreef:
> >>>>>> Hello Martin,
> >>>>>>
> >>>>>> It looks indeed that it's an initialisation issue. We are trying to
> >>>>>> trace the bug and for now we suspect that the issue is in the class
> >>>>>> Proj4Keyword
> >>>>>> This method checkUnsupported is throwing the error. The code thinks
> >>>>>> one
> >>>>>> of the params is not supported.
> >>>>>>
> >>>>>> If we find a sollution we will send it.
> >>>>>>
> >>>>>> Regards,
> >>>>>> Peter Peterse
> >>>>>>
> >>>>>>
> >>>>>> Op 17-10-2012 18:27, Martin Davis schreef:
> >>>>>>> I just tried this as well, and the code works fine for me.  But if
> >>>>>>> the
> >>>>>>> problem is some kind of transient intialization error it's probably
> >>>>>>> not going to show up in simple one-off tests.
> >>>>>>>
> >>>>>>> All I can suggest is to try and see if you can catch the problem in a
> >>>>>>> debug session, and then have a look at why it might be occurring.
> >>>>>>>
> >>>>>>> Nice to see Proj4J is getting used!
> >>>>>>>
> >>>>>>> Martin
> >>>>>>>
> >>>>>>> On Wed, Oct 17, 2012 at 3:10 AM, P. Peterse (HDB)
> >>>>>>> <p.peterse at han-dataport.nl> wrote:
> >>>>>>>> Hello list,
> >>>>>>>>
> >>>>>>>> We are using org.osgeo.proj4j in our project and facing sometimes an
> >>>>>>>> issue while transforming an coordinate from lat/long format to
> >>>>>>>> EPSG:28992.
> >>>>>>>> Most times the conversion will work ok, but sometimes there comes an
> >>>>>>>> exception:
> >>>>>>>> towgs84 parameter is not supported
> >>>>>>>> The input coordinate is:
> >>>>>>>> LatLon[lat=52.11882666666666, lon=5.04316]
> >>>>>>>>
> >>>>>>>> The used code is as follows:
> >>>>>>>> ===============
> >>>>>>>>          CRSFactory csFactory = new CRSFactory();
> >>>>>>>>          final String EPSG28992_PARAM = "+proj=sterea
> >>>>>>>> +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079
> >>>>>>>> +x_0=155000 +y_0=463000 +ellps=bessel
> >>>>>>>> +towgs84=565.417,50.3319,465.552,-0.398957,0.343988,-1.8774,4.0725
> >>>>>>>> +units=m +no_defs";
> >>>>>>>>          CoordinateReferenceSystem epsg28992 =
> >>>>>>>> csFactory.createFromParameters("EPSG:28992", EPSG28992_PARAM);
> >>>>>>>>
> >>>>>>>>          final String WGS84_PARAM = "+title=long/lat:WGS84
> >>>>>>>> +proj=longlat
> >>>>>>>> +ellps=WGS84 +datum=WGS84 +units=degrees";
> >>>>>>>>          CoordinateReferenceSystem epsg4326 =
> >>>>>>>> csFactory.createFromParameters("WGS84",WGS84_PARAM);
> >>>>>>>>
> >>>>>>>>          CoordinateTransformFactory ctFactory = new
> >>>>>>>> CoordinateTransformFactory();
> >>>>>>>>          CoordinateTransform trans =
> >>>>>>>> ctFactory.createTransform(epsg4326,
> >>>>>>>> epsg28992);
> >>>>>>>>          ProjCoordinate inCoord = new ProjCoordinate();
> >>>>>>>>          ProjCoordinate outCoord = new ProjCoordinate();
> >>>>>>>>          inCoord.y = pos.getLat();
> >>>>>>>>          inCoord.x = pos.getLon();
> >>>>>>>>          //convert from lat/lon to RD.
> >>>>>>>>          trans.transform(inCoord, outCoord);
> >>>>>>>>          final double[] point = new double[2];
> >>>>>>>>          point[0]=outCoord.x;
> >>>>>>>>          point[1]=outCoord.y;
> >>>>>>>>
> >>>>>>>>          return point;
> >>>>>>>> ===============
> >>>>>>>>
> >>>>>>>> Does anyone have a clue what's going wrong over here?
> >>>>>>>>
> >>>>>>>> Thanks for your patience.
> >>>>>>>>
> >>>>>>>> Regards,
> >>>>>>>> Peter Peterse
> >>>>>>>> _______________________________________________
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> >>>>>>
> >>>>>>
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