[gdal-dev] JRE vs JDK

[Ivan Lucena]

Hi Even,

>  -------Original Message-------
>  From: Even Rouault <even.rouault at mines-paris.org>
>  To: gdal-dev at lists.osgeo.org, Ivan Lucena <ivan.lucena at princeton-ma.us>
>  Subject: Re: [gdal-dev] JRE vs JDK
>  Sent: Oct 26 '12 13:26
>  
>  Le vendredi 26 octobre 2012 17:52:18, Ivan Lucena a écrit :
>  > Hi there,
>  >
>  > I am getting this exception when loading gdal.jar:
>  >
>  > *
>  > Native library load failed.
>  > java.lang.UnsatisfiedLinkError: org.gdal.gdal.gdalJNI.HasThreadSupport()I
>  > *
>  >
>  > If I change the script that launch my application to use the "java.exe"
>  > from the JDK instead of the JRE then the problem is gone. The problem is
>  > that users usually have only JRE. Right?
>  >
>  > Anyway, It doesn't seems like there is nothing wrong with the GDAL built. I
>  > also try the same test with Tamas' binaries but got the same strange
>  > error.
>  >
>  > An by looking at swig/include/java/*.i I can see that some of the
>  > loadLibrary would issue that message before the exception.
>  >
>  > "WARNING : GDAL should be compiled with thread support for safe execution
>  > in Java."
>  >
>  > But I am not getting it. So the error must be coming from loading
>  > "gdalconstjni.dll" or "osrjni.dll" but not "gdaljni.dll" or "ogrjni.dll"
>  >
>  > I haven't tried that with Linux but I will.
>  >
>  > I search for "java.lang.UnsatisfiedLinkError:
>  > org.gdal.gdal.gdalJNI.HasThreadSupport()I" on the web there are a hand
>  > full of question about that but none of the suggestions mentioned the JRE
>  > vs JDK issue.
>  >
>  > Does anybody has a clue?
>  
>  I'm a bit skeptical about this being a JRE vs JDK issue. I suspect that you
>  have an issue with the supporting dll (the 4 jni ones and gdalXXX.dll and its
>  dependencies) not being found in the PATH.

You are right. But if one of the GDAL/OGR JNI DLL was missing, the message would be something like:

java.lang.UnsatisfiedLinkError: no gdaljni in java.library.path
Exception in thread "main" java.lang.UnsatisfiedLinkError: org.gdal.gdal.gdalJNI
.AllRegister()V
        at org.gdal.gdal.gdalJNI.AllRegister(Native Method)
        at org.gdal.gdal.gdal.AllRegister(gdal.java:475)

The problem seems to be the dependencies. Looking at he Process Monitor I can see that there is a lot of confusion going on between 64 and 32 bits versions of third level DLLs (GDAL -> plugin -> SDK-X -> etc. -> etc.). 

It is a Windows 7 64 bits machine.

All I need to do is to complete isolate the PATH on my script from whatever is on the system PATH by *not* using %PATH% at all. Not either before or *after* the paths I need! Yes, not even after. That WOW64 is very strange.

>  
>  I've just tried with an older release-1500-dev.zip from Tamas site and a JRE.
>  
>  I put gdalinfo.class (compiled from the samples in swig/java/apps) in C:
>  \release-1500-dev\release-1500\bin\gdal\java
>  
>  And then, after calling SDKShell.bat, just run from there :
>  
>  C:\release-1500-dev\release-1500\bin\gdal\java>java -cp gdal.jar;. gdalinfo
>  
>  Seems to work.

Thank you so very much for doing that test.

Best regards,

Ivan