Experimental Physics and
Industrial Control System

Hi Bao,
You need set some environment parameter properly for JCA in
JCALibrary.properties file before you start using it.
There is a tutorial under doc directory if you downloaded the source code.
Some some detail explanation can be found in that file about how to
setJCALibrary.properties .

BTW: Which OS do you use, Linux, Win/XP, ...?
Do you compile the JCA library from source code by yourself?

Guobao Shen

-----Original Message-----
To: [email protected]
Subject: JCA using problem

                                       Hello,all
	I am using JCA to do some experment.But the first program can not
run.The error message is:java.lang.IllegalStateException: Context not
initialized.
	My environment:
	JDK 1.5
	JCA 2.3.1
	EPICS 3.14.8

	The program:
import gov.aps.jca.Channel;
import gov.aps.jca.Context;
import gov.aps.jca.JCALibrary;

public class test {
	public static void main(String[] args) {
		 try {
			  JCALibrary jca= JCALibrary.getInstance();
		      Context ctxt=
jca.createContext(JCALibrary.JNI_THREAD_SAFE);
		      ctxt.printInfo();
              Channel ch= ctxt.createChannel("light");
			  ctxt.pendIO(5.0);
		      ch.printInfo();
		     ch.destroy();
		      ctxt.destroy();
		    } catch(Exception ex) {
		      System.err.println(ex);
		    }
	}

}

BaoChunlei
Control Group,IHEP

References:

JCA using problem 鲍春雷

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