unix-junkie/gcj-cni-example

Shows how to use JNI and CNI from Java code which is AOT-compiled with GCJ

GCJ relies upon a modified version of ECJ 3.11.1, a part of Eclipse 4.5.1, released in February 2016.

The corresponding Maven artifact, available from Maven Central, is org.eclipse.jdt.core.compiler:ecj:4.5.1.

The GCCMain class invoked by ecj1 is available from Debian patches (ecj version 3.11.1 available as a part of Debian 9 "Stretch").

When configuring GCC (5.x or 6.x), the --with-ecj-jar switch should be passed to the configure script, e.g.:

./configure --with-ecj-jar=/usr/share/java/ecj.jar

If libecj-java package is upgraded along with Debian Linux, the GCCMain class will be gone, breaking the Java-to-bytecode compilation feature of GCJ (gcj -C).

External Links

• Cygnus Implementation of the Java Language, June 1998
• Guide to GNU gcj
• The Cygnus Native Interface for C++/Java Integration
• GCJ: the GNU Compiler for Java, January 2003
• Java CNI, December 2002
• Proceedings of the GCC Developers’ Summit, June 2004
• Java — CNI — X Window System (JCNIX)
• Java/C++ integration: Writing native Java methods in natural C++