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    Problem with Read Property Request

    BACnet4J general discussion
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    • D
      decora
      last edited by

      Hi, i have a problem with ReadPropertyRequest. When i run my Java program, eclipse return an exception, precisely:

      
Exception in thread "main" java.lang.NullPointerException
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.send(IpMessageControl.java:216)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:432)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:422)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:415)
	at Prova_B4J.main(Prova_B4J.java:143)

      My program is this:

      
public class Prova_B4J {
	
	private Prova_B4J(){}
	
	public static void main(String[] args) throws IOException, InterruptedException, BACnetException, BACnetServiceException{
		
		LocalDevice localDevice = new LocalDevice(1969,"172.16.4.14", "172.16.4.40");
		localDevice.setPort(0xBAC0);
		localDevice.getConfiguration().setProperty(PropertyIdentifier.segmentationSupported,Segmentation.noSegmentation);
		RemoteDevice remoteDevice = new RemoteDevice(0, new Address(new byte[] { (byte) 172, (byte) 16, 4, (byte) 14 },0xBAC0 ), null);
		localDevice.addRemoteDevice(remoteDevice);
		
			localDevice.getEventHandler().addListener(new DeviceEventListener(){  
				  
	            public void listenerException(Throwable e) {  
	                System.out.println("DiscoveryTest listenerException");
	                e.printStackTrace();
	            }  
	  
	            public void iAmReceived(RemoteDevice d) {  
	                System.out.println("DiscoveryTest iAmReceived");  
	                synchronized (this) {  
	                    this.notifyAll();  
	                }  
	            }  
	  
	            public boolean allowPropertyWrite(BACnetObject obj, PropertyValue pv) {  
	                System.out.println("DiscoveryTest allowPropertyWrite");  
	                return true;  
	            }  
	  
	            public void propertyWritten(BACnetObject obj, PropertyValue pv) {  
	                System.out.println("DiscoveryTest propertyWritten");  
	            }  
	  
	            public void iHaveReceived(RemoteDevice d, RemoteObject o) {  
	                System.out.println("DiscoveryTest iHaveReceived");  
	            }  
	  
	            public void covNotificationReceived(UnsignedInteger subscriberProcessIdentifier, RemoteDevice initiatingDevice, ObjectIdentifier monitoredObjectIdentifier, UnsignedInteger timeRemaining, SequenceOf<PropertyValue> listOfValues) {  
	                System.out.println("DiscoveryTest covNotificationReceived");  
	            }  
	  
	            public void eventNotificationReceived(UnsignedInteger processIdentifier, RemoteDevice initiatingDevice, ObjectIdentifier eventObjectIdentifier, TimeStamp timeStamp, UnsignedInteger notificationClass, UnsignedInteger priority, EventType eventType, CharacterString messageText, NotifyType notifyType, Boolean ackRequired, EventState fromState, EventState toState, NotificationParameters eventValues) {  
	                System.out.println("DiscoveryTest eventNotificationReceived");  
	            }  
	  
	            public void textMessageReceived(RemoteDevice textMessageSourceDevice, Choice messageClass, MessagePriority messagePriority, CharacterString message) {  
	                System.out.println("DiscoveryTest textMessageReceived");  
	            }  
	  
	            public void privateTransferReceived(UnsignedInteger vendorId, UnsignedInteger serviceNumber, Encodable serviceParameters) {  
	                System.out.println("DiscoveryTest privateTransferReceived");  
	            }

				@Override
				public void eventNotificationReceived(UnsignedInteger arg0,
						RemoteDevice arg1, ObjectIdentifier arg2,
						TimeStamp arg3, UnsignedInteger arg4,
						UnsignedInteger arg5, EventType arg6,
						CharacterString arg7, NotifyType arg8,
						com.serotonin.bacnet4j.type.primitive.Boolean arg9,
						EventState arg10, EventState arg11,
						NotificationParameters arg12) {
					// TODO Auto-generated method stub
					System.out.println("DiscoveryTest eventNotificationReceived");
				}

				@Override
				public void reinitializeDevice(ReinitializedStateOfDevice arg0) {
					// TODO Auto-generated method stub
					
				}

				@Override
				public void synchronizeTime(DateTime arg0, boolean arg1) {
					// TODO Auto-generated method stub
					
				}  
	        });  
			
	        localDevice.initialize();  
	        System.out.println("Sono pronto...");
	        
	        ReadPropertyRequest RPR= new ReadPropertyRequest(new ObjectIdentifier(ObjectType.analogOutput,11),new PropertyIdentifier(85));
	        localDevice.send(remoteDevice,RPR);
	        	        
	    }
	
}

      What is the problem?
      Thanks in advance!

      1 Reply Last reply Reply Quote 0
      • M
        mlohbihler
        last edited by

        Did you initialize the local device?

        Best regards,
        Matthew

        1 Reply Last reply Reply Quote 0
        • D
          decora
          last edited by

          Yes, I did...look at row 82...i used localDevice.initialize();

          PS: About the device that should receive the ReadPropertyRequest, I have simulated it with VTS

          1 Reply Last reply Reply Quote 0
          • M
            mlohbihler
            last edited by

            The line numbers in the stack trace aren't lining up with my code. Are you using the latest version?

            Best regards,
            Matthew

            1 Reply Last reply Reply Quote 0
            • D
              decora
              last edited by

              Yes, i'm using bacnet4j 1.2 downloaded form sourceforge project

              1 Reply Last reply Reply Quote 0
              • M
                mlohbihler
                last edited by

                For fun, try this one...

                Attachment: download link

                Best regards,
                Matthew

                1 Reply Last reply Reply Quote 0
                • D
                  decora
                  last edited by

                  I tried using your library, and indeed it is different from mine, since I also had to add the commons-lang3.3.1.jar at the project to make it work.
                  Despite this, However, the problem is not solved :-(

                  1 Reply Last reply Reply Quote 0
                  • M
                    mlohbihler
                    last edited by

                    Ok, but can you post the stack trace? I assume the line numbers are different now.

                    Best regards,
                    Matthew

                    1 Reply Last reply Reply Quote 0
                    • D
                      decora
                      last edited by

                      Yes, the line numbers are different.
                      This is the stack trace:

                      
Exception in thread "main" java.lang.NullPointerException
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.send(IpMessageControl.java:226)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:480)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:470)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:463)
	at Prova_B4J.main(Prova_B4J.java:143)
                      1 Reply Last reply Reply Quote 0
                      • M
                        mlohbihler
                        last edited by

                        Your remote device has a segmentationSupported value of null. Normally you wouldn't instantiate your own RemoteDevice objects, BTW. An IAm (resulting from a WhoIs broadcast) is the typical means of instantiation. A "manual" way to get remote devices is to use the LocalDevice.findRemoteDevice method.

                        Best regards,
                        Matthew

                        1 Reply Last reply Reply Quote 0
                        • D
                          decora
                          last edited by

                          I tried your solutions, but there are other problems.
                          If I use:

                          
remoteDevice=localDevice.findRemoteDevice( new Address(new byte[] { (byte) 192, (byte) 168, (byte) 1, (byte) 112 },0xBAC0 ), null, 1);

                          eclipse return this exception:

                          
Exception in thread "main" com.serotonin.bacnet4j.exception.BACnetException: java.lang.NullPointerException
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.sendImpl(IpMessageControl.java:377)
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.send(IpMessageControl.java:302)
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.send(IpMessageControl.java:248)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:480)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:470)
	at com.serotonin.bacnet4j.LocalDevice.findRemoteDevice(LocalDevice.java:1047)
	at Prova_B4J_2.main(Prova_B4J_2.java:57)
Caused by: java.lang.NullPointerException
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.sendImpl(IpMessageControl.java:374)
	... 6 more

                          If I use:

                          
localDevice.sendBroadcast(0xBAC0,new WhoIsRequest(null,null));

                          eclipse return:

                          
Exception in thread "main" com.serotonin.bacnet4j.exception.BACnetException: java.lang.NullPointerException
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.sendImpl(IpMessageControl.java:377)
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.sendBroadcast(IpMessageControl.java:359)
	at com.serotonin.bacnet4j.LocalDevice.sendBroadcast(LocalDevice.java:520)
	at Prova_B4J_2.main(Prova_B4J_2.java:59)
Caused by: java.lang.NullPointerException
	at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.sendImpl(IpMessageControl.java:374)
	... 3 more
                          1 Reply Last reply Reply Quote 0
                          • M
                            mlohbihler
                            last edited by

                            Did you initialize the local device before sending those requests?

                            Best regards,
                            Matthew

                            1 Reply Last reply Reply Quote 0
                            • D
                              decora
                              last edited by

                              Perfect!! Thnak you very, but very very very much for the help!

                              I have only another questions...If I send an I-am message from VTS to instantiate the remote device in my java program, I have no problem ... but if I send it from another java program (always based on bacnet4j), eclipse returns this exception when I send the ReadPropertyRequest:

                              
Exception in thread "main" com.serotonin.bacnet4j.exception.ErrorAPDUException: ErrorAPDU(choice=5, errorClass=Object, errorCode=Unknown object)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:489)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:470)
	at com.serotonin.bacnet4j.LocalDevice.send(LocalDevice.java:463)
	at Prova_B4J_2.main(Prova_B4J_2.java:106)
                              1 Reply Last reply Reply Quote 0
                              • M
                                mlohbihler
                                last edited by

                                Your BACnet4J device does not have the object you are looking for. You need to create a BACnet object with the correct properties, and then add it to the local device.

                                Best regards,
                                Matthew

                                1 Reply Last reply Reply Quote 0
                                • D
                                  decora
                                  last edited by

                                  Thank you mlohbihler! You have been my salvation!

                                  1 Reply Last reply Reply Quote 0
                                  • M
                                    mlohbihler
                                    last edited by

                                    Glad to help. Buy a license. :)

                                    Best regards,
                                    Matthew

                                    1 Reply Last reply Reply Quote 0
                                    • D
                                      decora
                                      last edited by

                                      :wink:

                                      1 Reply Last reply Reply Quote 0
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