When we were developing the JNI example as mentioned in our another post, “Java Native Interface ( JNI ) Example , Calling Native C functions from JAVA” we got an error “Exception in thread “main” java.lang.UnsatisfiedLinkError: no hello in java.library.path” as below, Exception in thread "main" java.lang.UnsatisfiedLinkError: no hello in java.library.path at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1860) at java.lang.Runtime.loadLibrary0(Runtime.java:871) at java.lang.System.loadLibrary(System.java:1124) at HelloWorld.<clinit>(HelloWorld.java:4) at Main.main(Main.java:4) Solution : This error can be solved by adding the PATH of the native shared library using LD_LIBRARY_PATH as, $ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD execute this command from the directory where you are trying to execute the JNI example. i.e. the directory where you have created shared library OR you can replace $PWD with the complete path to directory with shared library.

Implementation details

Now we can check the LD_LIBRARY_PATH as, $ echo $LD_LIBRARY_PATH :/home/devlab/Desktop/jni Now, if you execute the JNI application, you will not see the error.

Gotchas and common issues

  • Permission checks - verify user access rights and sudo privileges before executing system-level operations.

  • Environment configuration - double-check path variables and dependency versions to prevent runtime failures.

  • Backup safeguards - maintain configuration backups before applying system or database modifications.

Following these steps ensures clean configuration and reliable execution for solved: java.lang.unsatisfiedlinkerror: no hello in java.library.path.