Experimental Physics and
Industrial Control System

Daron Chabot <[email protected]> · Fri, 23 Nov 2007 13:13:06 -0600

鲍春雷 wrote:
> 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 1.6
> 	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 {
> 		      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);
> 		    }
> 	}
>
> }
>   
Looks like you might be missing this:

/* get the JCALibrary instance... */
JCALibrary jca = JCALibrary.getInstance( );


-- dc

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System