[GitHub] jesterhazy opened a new issue #12416: opencv path error in mxnet scala tutorial

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jesterhazy opened a new issue #12416: opencv path error in mxnet scala tutorial
URL: https://github.com/apache/incubator-mxnet/issues/12416
 
 
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   ## Description
   
   The mxnet scala in intellij instructions at http://mxnet.incubator.apache.org/tutorials/scala/mxnet_scala_on_intellij.html do not work because of an opencv library path error.
   
   ```
   Package used (Python/R/Scala/Julia):
   mxnet-scala
   
   For Scala user, please provide:
   1. Java version: 1.8.0_171
   2. Maven version:  3.3.9 
   3. Scala runtime if applicable: 2.11.8
   
   For R user, please provide R `sessionInfo()`:
   ```
   
   ## Error Message:
   ```
   Exception in thread "main" java.lang.UnsatisfiedLinkError: /private/var/folders/nz/57cdgtr11pdg01rgzyzhjxvmqwmxjn/T/mxnet4117240061172168094/mxnet-scala: dlopen(/private/var/folders/nz/57cdgtr11pdg01rgzyzhjxvmqwmxjn/T/mxnet4117240061172168094/mxnet-scala, 1): Library not loaded: /usr/local/opt/opencv/lib/libopencv_stitching.3.4.dylib
     Referenced from: /private/var/folders/nz/57cdgtr11pdg01rgzyzhjxvmqwmxjn/T/mxnet4117240061172168094/mxnet-scala
     Reason: image not found
       at java.lang.ClassLoader$NativeLibrary.load(Native Method)
       at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
       at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1824)
       at java.lang.Runtime.load0(Runtime.java:809)
       at java.lang.System.load(System.java:1086)
       at org.apache.mxnet.util.NativeLibraryLoader$.loadLibraryFromStream(NativeLibraryLoader.scala:140)
       at org.apache.mxnet.util.NativeLibraryLoader$.loadLibrary(NativeLibraryLoader.scala:93)
       at org.apache.mxnet.Base$.<init>(Base.scala:70)
       at org.apache.mxnet.Base$.<clinit>(Base.scala)
       at org.apache.mxnet.NDArray$.initNDArrayModule(NDArray.scala:151)
       at org.apache.mxnet.NDArray$.<init>(NDArray.scala:38)
       at org.apache.mxnet.NDArray$.<clinit>(NDArray.scala)
       at mxnet.App$.delayedEndpoint$mxnet$App$1(App.scala:9)
       at mxnet.App$delayedInit$body.apply(App.scala:6)
       at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
       at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
       at scala.App$$anonfun$main$1.apply(App.scala:76)
       at scala.App$$anonfun$main$1.apply(App.scala:76)
       at scala.collection.immutable.List.foreach(List.scala:381)
       at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
       at scala.App$class.main(App.scala:76)
       at mxnet.App$.main(App.scala:6)
       at mxnet.App.main(App.scala)
   ```
   
   ## Steps to reproduce
   
   1. Follow tutorial to "Step 7. Run Sample MXNet Code in the App" and run the app
   2. App fails with stack trace shown above.
   
   ## What have you tried to solve it?
   
   1. Replacing the `brew install opencv@2` command in the mac prequisite setup section with `brew install opencv` fixes the problem and lets the example app run successfully. So either the example doc needs to be revised to use the other opencv version, or mxnet scala needs to look for different lib path.
   

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