Well I am trying to create an agent to compete in the Starcraft AI competition for next year, the API that the agents all use is called BWAPI: http://code.google.com/p/bwapi/, but this is also a standard library that some of the agents use that would be really useful for for my agent called BWSAL: http://code.google.com/p/bwsal/. Anyway there is a native interface that someone created for BWAPI, which I was planning on using in my code, so my plan was to create a native interface for BWSAL, that way I could do all the Jess interaction inside of Java, then call associated methods in C++ via JNI. Does this sound far-fetched?
On Thu, Sep 29, 2011 at 5:10 PM, Socrates Frangis <soc.fran...@gmail.com>wrote: > What framework are you using? Curious to see how it is invoking JNI. > > > "using this I think I can only interact with Jess in my Java program then > pass data from my Java code to C++" > -Unless your framework has an API supporting JESS specifically, i doubt > that is the case. It should be providing a 'simpler' implementation to > access your java classes but that would just eliminate the cryptic path > declaration and still give you an interface to what youre playing with. > > Overall opinion, given the chance that your framework may inhibit full > controll of the Rete engine or using JESS (and for the learning experience) > i would recommend sticking with your current implementation. Rule engines > require precise attention to detail and i wouldn't risk the chance of losing > fidelity. > > > On Wed, Sep 28, 2011 at 2:22 PM, Hunter McMillen <mcmil...@gmail.com>wrote: > >> Sorry to pester you with more questions. >> >> The way I am currently doing things in invoking a JVM from C++ to call >> Java code that calls/interacts with Jess code, but it turns out that someone >> has actually created a java native interface for the api/framework I am >> using to make my agent, using this I think I can only interact with Jess in >> my Java program then pass data from my Java code to C++, I was wondering if >> you thought this would be a better solution than invoke a JVM from C++ >> >> Thanks >> Hunter >> >> >> On Tue, Sep 27, 2011 at 12:03 PM, Friedman-Hill, Ernest < >> ejfr...@sandia.gov> wrote: >> >>> ** >>> This is all perfectly reasonable so far. When you create the JVM you'll >>> need to tell it where jess.jar is, along with any other jars you use, with >>> the "-cp" flag or the "java.class.path" property. >>> >>> Once you have this working, you'll presumably want to connect things a >>> little more tightly. You can use the JNI API to write the equivalent of your >>> three-line main() in C++ pretty easily; you'll want to put together a C++ >>> version "executeCommand()" that controls the Rete instance, passes a script >>> along, executes it, and gets the Value back, decoding it as needed. >>> >>> >>> ------------------------------ >>> *From:* owner-jess-us...@sandia.gov [mailto:owner-jess-us...@sandia.gov] >>> *On Behalf Of *Hunter McMillen >>> *Sent:* Monday, September 26, 2011 8:51 PM >>> *To:* jess-users >>> *Subject:* JESS: Call Jess from C++ via JNI >>> >>> Hello everyone, >>> >>> I am working on a project where I am using a C++ framework and API to >>> create a game agent. My agent has to be flexible so it can react to/predict >>> events that occur inside the game environment, Jess has the kind >>> of flexibility that I need for my agent to be good, but I am having trouble >>> connecting to Jess from C++ and that is where I was hoping someone could >>> help me out. >>> >>> *What I am doing right now* >>> I have a C++ program that starts a Java Virtual Machine and searches for >>> a Java class file name "TestJNIJessInvoke" >>> >>> Inside of "TestJNIJessInvoke.java" I define a simple function in Jess, >>> and try to call that function then print the result >>> import jess.*; >>> public class TestJNIJessInvoke >>> { >>> public static void main(String[] args) throws JessException >>> { >>> Rete r = new Rete(); >>> r.executeCommand("(deffunction square (?n) (return (* ?n ?n)))"); >>> Value v = r.executeCommand("(square 3)"); >>> >>> System.out.println(v.intValue(r.getGlobalContext())); >>> } >>> } >>> >>> But when I try to compile and link the C++ file with: >>> *cl * >>> * -I"C:\Program Files\Java\jdk1.7.0\include" * >>> * -I"C:\Program Files\Java\jdk1.7.0\include\win32" * >>> * TestJNIJessInvoke.cpp * >>> * -link "C:\Program Files\Java\jdk1.7.0\lib\jvm.lib"* >>> * >>> * >>> I get a class loader exception: >>> *Exception in thread "main" java.lang.NoClassDefFoundError: jess/Rete* >>> * at TestJNIJessInvoke.main(TestJNIJessInvoke.java:6)* >>> *Caused by: java.lang.ClassNotFoundException: jess.Rete* >>> * at java.net.URLClassLoader$1.run(URLClassLoader.java:366)* >>> * at java.net.URLClassLoader$1.run(URLClassLoader.java:355)* >>> * at java.security.AccessController.doPrivileged(Native Method)* >>> * at java.net.URLClassLoader.findClass(URLClassLoader.java:354)* >>> * at java.lang.ClassLoader.loadClass(ClassLoader.java:423)* >>> * at >>> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)* >>> * at java.lang.ClassLoader.loadClass(ClassLoader.java:356)* >>> * ... 1 more* >>> * >>> * >>> Exception in thread "main" java.lang.NoClassDefFoundError: jess/Rete >>> at TestJNIJessInvoke.main(TestJNIJessInvoke.java:6) >>> Caused by: java.lang.ClassNotFoundException: jess.Rete >>> at java.net.URLClassLoader$1.run(URLClassLoader.java:366) >>> at java.net.URLClassLoader$1.run(URLClassLoader.java:355) >>> at java.security.AccessController.doPrivileged(Native Method) >>> at java.net.URLClassLoader.findClass(URLClassLoader.java:354) >>> at java.lang.ClassLoader.loadClass(ClassLoader.java:423) >>> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) >>> at java.lang.ClassLoader.loadClass(ClassLoader.java:356) >>> ... 1 more >>> >>> *Questions* >>> >>> 1) Is there some other directory that I am supposed to be including >>> that has the .class files for Jess? Right now all I am including is jess.jar >>> 2) Is the general design I have a good idea? or is there a better way to >>> facilitate communication between Jess and C++? >>> >>> >>> >>> Thanks, >>> Hunter McMillen >>> >>> >> > > > -- > V/R > -Socrates Frangis > -Mathematician & Software Engineer >
