RE: the first installing jca2.1.2 problem

["Pearson, MR \(Matthew\)" <matthew.pearson@diamond.ac.uk>]

Hi,

 

Maybe you're missing the import statement at the top of the file?

Looking at the JavaDoc for JCA it looks like you need this:

 

import gov.aps.jca.JCALibrary;

 

It's much easier sometimes to use something like the Eclipse IDE, which would highlight compile errors like this, and even offer to correct them for you.

 

Cheers,

Matthew

---

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Thomas Pelaia II
Sent: 08 June 2007 13:06
To: zhaozhuo
Cc: tech-talk
Subject: Re: the first installing jca2.1.2 problem

Hi,

That's an old version of JCA.  Before trying to figure out how to work with it, I suggest starting with the latest version of JCA from Cosylab:

http://jca.cosylab.com/downloads.html

-tom

On Jun 8, 2007, at 3:47 AM, zhaozhuo wrote:

I installed jdk1.5.0 and base3.14.7 and jca binary from jca2.1.2-linux-x86.tgz, added CLASSPATH and LD_LIBRARY_PATH.

Now I excersised the example1.java in the tutorial

http://www.aps.anl.gov/xfd/SoftDist/swBCDA/jca/2.1.2/tutorial.html

, But when I excute "javac example1.java", and got these:

 

example1.java:12:cannot find symbol

symbol       : class JCALibrary

location:class example1

 

    JCALibrary jca= JCALibrary.getInstance();

 

Who can help me?

 

I copied the script "example1.java" and configured the file ".JCALibrary.properties" like the following:

 

// File: example1.java

 

public class example1 {
  public static void main(String[] args) {
    if(args.length!=1) {
      System.out.println("usage: java example1 <pvname>");
      return;
    }
   
    try {
      // Get the JCALibrary instance.
      JCALibrary jca= JCALibrary.getInstance();

 

    // Create a single threaded context with default configuration values.
    Context ctxt= jca.createContext(JCALibrary.JNI_SINGLE_THREADED);

 

    // Display basic information about the context.
    ctxt.printInfo();

 

    // send the request and wait 5.0 seconds for the channel to connect to the PV.
    ctxt.pendIO(5.0);

 

    // If we're here, then everything went fine.
    // Display basic information about the channel.
    ch.printInfo();

 

    // Disconnect the channel.
    ch.destroy();

 

    // Destroy the context.
    ctxt.destroy();

 

  } catch(Exception ex) {
    System.err.println(ex);
  }
 }
}

 

//File JCALibrary.properties

#define the location of the epics shared libraries and caRepeater executable
#gov.aps.jca.jni.epics.win32-x86.library.path= c:/epics/baseR3.14.4/bin/win32-x86
#gov.aps.jca.jni.epics.win32-x86.caRepeater.path= c:/epics/baseR3.14.4/bin/win32-x86

 

gov.aps.jca.jni.epics.linux-x86.library.path= /home/epicsadm/epics3.14.7/base-3.14.7/lib/linux-x86
gov.aps.jca.jni.epics.linux-x86.caRepeater.path= /home/epicsadm/epics3.14.7/base-3.14.7/bin/linux-x86

 

# define default values for both JNI_THREAD_SAFE and JNI_SINGLE_THREADED contexts.
gov.aps.jca.jni.JNIContext.preemptive_callback= true
gov.aps.jca.jni.JNIContext.addr_list="192.168.44.244"
gov.aps.jca.jni.JNIContext.auto_addr_list= true
gov.aps.jca.jni.JNIContext.connection_timeout= 30.0
gov.aps.jca.jni.JNIContext.beacon_period= 15.0
gov.aps.jca.jni.JNIContext.repeater_port= 5065
gov.aps.jca.jni.JNIContext.server_port= 5064
gov.aps.jca.jni.JNIContext.max_array_bytes= 16384

 

# define default values only for JNI_SINGLE_THREADED context
gov.aps.jca.jni.SingleThreadedContext.event_dispatcher= gov.aps.jca.event.DirectEventDispatcher

 

# define default values only for JNI_THREAD_SAFE context
gov.aps.jca.jni.ThreadSafeContext.event_dispatcher= gov.aps.jca.event.QueuedEventDispatcher
gov.aps.jca.jni.ThreadSafeContext.priority= 5

 

# define default values for QueuedEventDispatcher components
gov.aps.jca.event.QueuedEventDispatcher= 5

 

 

 

 

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