在Elastic Beanstalk上使用Opencv运行Spring Boot

Question

I have a Spring boot application packaged as WAR which uses OpenCV for some image processing and I would like to run it on Elastic Beanstalk (Tomcat environment). Is there a way how to package it with the native Opencv libraries?

Everything is working fine on my local machine where I have the following configuration:

• Tomcat 8 running inside Eclipse with my application deployed to it.
• Opencv 3.1 installed on my computer
• opencv_310.jar placed in src/webapp/WEB-INF/lib
• Opencv added to Java build path ( path/to/opencv/build/bin )
• Tomcat running with VM argument -Djava.library.path=path/to/opencv/opencv/build/lib

This setup works fine and I am even able to package it with maven clean pakcage .

However, if I want to deploy to Amazon Elastic Beanstalk, I just cannot assume that Opencv will be installed on that machine (it won't) so I need to somehow package it inside my WAR file so everything is self-contained.

When I deploy my WAR to ELB, I always get

java.lang.UnsatisfiedLinkError: no opencv_java300 in java.library.path

when loading Opencv with System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

I found some tutorials on this for archaic versions of Opencv but I cannot seem to figure out how to do this easily. I would be glad for any tips, because I have been stuck on this for a long time.

Answer 1

When you run your tomcat server, you could pass the path to native libraries, so they will be preloaded, like this:

java -Djava.library.path=...

other way would be to put the libraries into the folder where the main jar (jar that you run tomcat from) of tomcat is.

Answer 2

I solved the problem by using this excellent Github project which provides OpenCV Java bindings packaged with native libraries and provided as a Maven dependency.

There is also a newer fork of this project with more up-to-date version of OpenCV which I am probably going to switch to. It supports OpenCV 2.4.10 which is a step back from version 3.1 that I was using but it does everything I expected from it.