Jni.h not found building wpilib on linux - C/C++ - Chief Delphi

If you require a specific version from Oracle, you can download the from the Official Oracle Java Downloads Page . Once downloaded, extract it to a directory like /opt/java/ . Locating jni.h on Your System

sudo apt update && sudo apt install default-jdk

jni.h is a C/C++ header file essential for development, allowing Java code to interact with native applications and libraries written in C or C++. On Linux, you do not typically download jni.h as a standalone file; instead, it is bundled within the Java Development Kit (JDK) . How to Get jni.h on Linux

When compiling your native C/C++ code, you must explicitly point your compiler to these directories using the -I flag.