ColdFusion 2016 Java API call TensorFlow cannot initialize class
I am trying to call the TensorFlow Java API from ColdFusion 2016 developer edition on Windows 10 Home.
I took my cues from TensorFlow Readme.md In addition to the jar, it uses the platform-specific JNI DLL, so I installed my test:
<cfscript>
CreateObject("java","java.lang.System").load("C:\\absolutepath\\tensorflow_jni.dll");
variables.tensorflow = CreateObject("Java","org.tensorflow.TensorFlow");
WriteDump(variables.tensorflow);
WriteOutput("I'm running TensorFlow version: " & variables.tensorflow.version());
</cfscript>
I thought it would be a piece of cake when I see the WriteDump object: 
but calling version () just leaves the browser spinning.
Application log shows the following error:
Could not initialize class org.tensorflow.TensorFlow The specific sequence of files included or processed is: C:\ColdFusionBuilder2016\ColdFusion\cfusion\wwwroot\CF_TensorFlow\index.cfm, line: 5
The JNI seems to be loading ... When it doesn't, the error message is very clear "Cannot find native TensorFlow library for OS: windows ..."
I'm not sure what to do at this point. Is there something I need to do for the Java source to play well with CF?
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As you've probably figured out, the library looks for standard DLL locations first. So adding a path or file to one of these locations (after restarting CF) will definitely work:
- Add the DLL path to
java.library.path
- Copy the DLL file to the directory
jre\bin
Looking back at the source and comments , it seems the DLL can also be added to the TensorFlow jar. The exact path depends on o / s:
private static String makeResourceName() {
return "org/tensorflow/native/"
+ String.format("%s-%s/", os(), architecture())
+ System.mapLibraryName(LIBNAME);
}
So instead of using it, System.load()
open the jar and copy the DLL to the appropriate folder. For 64 bit windows the expected path org/tensorflow/native/windows-x86_64/tensorflow_jni.dll
.
libtensorflow-1.1.0-rc2-with-dll.jar
|-- META-INF
|-- org
|-- tensorflow
|-- TensorFlow.class
|-- ...
|-- native
|-- windows-x86_64
|-- tensorflow_jni.dll
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