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diff --git a/user/jkoenig/java/discussion.mdwn b/user/jkoenig/java/discussion.mdwn
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+++ b/user/jkoenig/java/discussion.mdwn
@@ -77,6 +77,34 @@ either new ones or existing ones, as applicable.
             pages ([[!taglink open_issue_documentation]]).
 
 
+# Java Native Interface (JNI)
+
+  * <http://en.wikipedia.org/wiki/Java_Native_Interface>
+  * <http://download.oracle.com/javase/7/docs/technotes/guides/jni/>
+  * <http://java.sun.com/products/jdk/faq/jnifaq.html>
+  * <http://java.sun.com/docs/books/jni/>
+
+
+## Java Native Access (JNA)
+
+  * <http://jna.java.net/>
+  * <https://github.com/twall/jna#readme>
+
+This is a different approach, and *while some attention is paid to performance,
+correctness and ease of use take priority*.
+
+As we plan on only having a few native methods (for invoking `mach_msg`,
+essentially), JNA is probably the wrong approach: portability and ease of use
+is not important, but performance is.
+
+## Compiled Native Interface (CNI)
+
+  * <http://gcc.gnu.org/onlinedocs/gcj/About-CNI.html>
+  * <http://per.bothner.com/papers/UsenixJVM01/CNI01.pdf>
+
+Probably faster than JNI, but only usable with GCJ.
+
+
 # IRC, freenode, #hurd, 2011-07-13
 
 [[!tag open_issue_documentation]]