Java - (Native Methods|Java Native Interface (JNI)) - java.library.path

See:

• Java Runtime Class and its Load Method
• Java System Class and its Loadlibrary Method

• in the PATH environment variable. <note important>Don't forget to restart your IDE</note>

• with the Djava.library.path VM options where you set a directory. The java.library.path is read only once when the JVM starts up. If you change this property using System.setProperty, it won't make any difference.

• Integrating Native Methods into Java Programs
• Java Native Interface