[Ipopt] I can't compile the JavaInterface

[Edmund Noon]

Hi,

I have checked out the trunk (svn co 
https://projects.coin-or.org/svn/Ipopt/trunk CoinIpopt) and the 
prerequisites which compile okay. The example hs_071_cpp compiles and 
executes.

When I try to make the JavaInterface I get lots of errors:-
../../../../Ipopt/contrib/JavaInterface/jipopt.cpp:21:17: error: jni.h: 
No such file or directory
In file included from ../../../../Ipopt/contrib/JavaInterface/jipopt.cpp:24:
./org_coinor_Ipopt.h:53: error: ‘JNIEXPORT’ does not name a type
./org_coinor_Ipopt.h:61: error: ‘JNIEXPORT’ does not name a type
./org_coinor_Ipopt.h:69: error: ‘JNIEXPORT’ does not name a type

Is there some code missing? Should I have done something else to get the 
JavaInterface Source?

I am using Ubuntu 10.04.

Edmund