By Junyu Zhou
I am new to DigitalOcean, Linux and libraries, and deeply appreciate any help from you on the following issue: I have been trying to make a native library work (libjsmile.so) in a web application with Apache Tomcat 7 on a Linux CentOS 7 DigitalOcean server, but I still haven’t succeeded. I was able to use this wrapper library (libjsmile.jnilib) as a Java application or a web application with Apache Tomcat 7 on a Mac. And I was able to load libjsmile.so as a Java application on this CentOS 7 server. The error starts to occur when I want to load libjsmile.so in a web application with Apache Tomcat 7 in this CentOS 7 server. I have tried to add LD_LIBRARY_PATH=“/usr/share/java/tomcat” and/or JAVA_OPTS=“-Djava.library.path=/usr/share/java/tomcat” to the Tomcat configuration file (tomcat.conf) and put the libjsmile.so inside that path. I have also tried to use System.loadLibrary(“jsmile”); or System.load(“/usr/share/java/tomcat/libjsmile.so”); Although some of the above methods could work in a Java application on the CentOS7 server, none of them work when I change to a web application using apache tomcat 7 on the CentOS7 server. It either gives the following error: java.lang.UnsatisfiedLinkError: smile.Wrapper.nativeStaticInit() Or just hang there (keep waiting for a response). Thanks a lot for any of your suggestions!
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Hello,
This error java.lang.UnsatisfiedLinkError: smile.Wrapper.nativeStaticInit() indicates that the JVM cannot find the native library or one of its dependencies.
Here’s a couple of steps you could take to try and fix the issue:
1. Verify the .so file
Make sure that the libjsmile.so file is compatible with your Linux system. If it was compiled on a different architecture, or if it’s a 32-bit library and you’re using a 64-bit JVM (or vice versa), it won’t work.
You can use the file command to check the architecture of your .so file:
file /usr/share/java/tomcat/libjsmile.so
2. Check Dependencies
Make sure that all dependencies of libjsmile.so are met. You can check this with the ldd command:
ldd /usr/share/java/tomcat/libjsmile.so
This will list all shared libraries that your .so file depends on. If there are any ‘not found’ entries, you’ll need to install those libraries.
3. Update LD_LIBRARY_PATH
Update the LD_LIBRARY_PATH environment variable to include the directory where libjsmile.so is located. This is not usually recommended for system services, but you could give it a try for debugging purposes. Update the setenv.sh script in your Apache Tomcat’s bin directory:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/share/java/tomcat
Then restart Apache Tomcat and see if the issue is resolved.
4. Set java.library.path
The java.library.path should be set to the directory containing the shared library. Add the following line to the setenv.sh script in your Apache Tomcat’s bin directory:
export CATALINA_OPTS="$CATALINA_OPTS -Djava.library.path=/usr/share/java/tomcat"
Then restart Apache Tomcat and see if the issue is resolved.
Remember, when editing configuration files or scripts, it’s a good practice to back up the original file.
Best,
Bobby
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