I want to Dockerize a web application, which works perfectly fine locally. When trying to run the application inside Docker, an UnsatisfiedLinkError is thrown when invoking a function from the Nauty library.
To work with this library locally, the Spring application has to be started by doing
java -Djava.library.path="<PATH>/backend/lib/" -jar backend.jar
This library path points to the directory where the Nauty library (libnauty.so) resides. In my ~/.bashrc, I also had to set the environment variable LD_LIBRARY_PATH=<PATH>/backend/lib/:/usr/local/lib. After making these two changes, the application works fine and functions from the Nauty library can be invoked without any problems.
After Dockerizing the application, I get the following error when invoking a library function
java.lang.UnsatisfiedLinkError: no nauty in java.library.path: "/home/backend/lib/"
However, the libnauty.so file is copied to the Docker container and is present in /home/backend/lib directory. I also set the environment variable LD_LIBRARY_PATH in the Docker container. The issue however still remains.
I use docker-compose to set up the application. The Dockerfile for the back-end looks like this.
FROM openjdk:17-oracle
ARG JAR_FILE=target/*.jar
EXPOSE 8080
ENV LD_LIBRARY_PATH=/home/backend/lib/:/usr/local/lib
COPY ${JAR_FILE} /home/backend/backend.jar
COPY . /home/backend
ENTRYPOINT ["java", "-Djava.library.path="/home/backend/lib/"", "-jar", "/home/backend/backend.jar"]
Any pointers to how this issue could be solved would be greatly appreciated. I have looked around for quite some time now, but I can’t seem to fix the problem.
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Answer
After hours of googling and debugging, the problem was the double quotes around the library path in the ENTRYPOINT. The correct way to specify it is just
ENTRYPOINT ["java", "-Djava.library.path=/home/backend/lib/", "-jar", "/home/backend/backend.jar"]