INFO: Create standard properties with file Californium.properties
Jan 12, 2018 7:57:55 AM org.eclipse.californium.core.CoapServer start
INFO: Starting server
Jan 12, 2018 7:57:55 AM org.eclipse.californium.core.CoapServer start
INFO: No endpoints have been defined for server, setting up default endpoint at port 5683
Jan 12, 2018 7:57:55 AM org.eclipse.californium.core.network.CoAPEndpoint start
INFO: Starting Endpoint bound to 0.0.0.0/0.0.0.0:5683
Jan 12, 2018 7:57:55 AM org.eclipse.californium.core.network.CoAPEndpoint start
SEVERE: Cannot start Endpoint at 0.0.0.0/0.0.0.0:5683
java.net.BindException: Address already in use
        at java.net.PlainDatagramSocketImpl.bind0(Native Method)
        at java.net.AbstractPlainDatagramSocketImpl.bind(AbstractPlainDatagramSocketImpl.java:93)
        at java.net.DatagramSocket.bind(DatagramSocket.java:372)
        at java.net.DatagramSocket.<init>(DatagramSocket.java:222)
        at java.net.DatagramSocket.<init>(DatagramSocket.java:279)
        at org.eclipse.californium.elements.UDPConnector.start(UDPConnector.java:88)
        at org.eclipse.californium.core.network.CoAPEndpoint.start(CoAPEndpoint.java:238)
        at org.eclipse.californium.core.CoapServer.start(CoapServer.java:217)
        at org.eclipse.iot.my.coap.MyCoapServer.activate(MyCoapServer.java:65)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:235)
        at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
        at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:345)
        at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
        at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
        at org.eclipse.equinox.internal.ds.Resolver.buildNewlySatisfied(Resolver.java:473)
        at org.eclipse.equinox.internal.ds.Resolver.enableComponents(Resolver.java:217)
        at org.eclipse.equinox.internal.ds.SCRManager.performWork(SCRManager.java:816)
        at org.eclipse.equinox.internal.ds.SCRManager$QueuedJob.dispatch(SCRManager.java:783)
        at org.eclipse.equinox.internal.ds.WorkThread.run(WorkThread.java:89)
        at org.eclipse.equinox.internal.util.impl.tpt.threadpool.Executor.run(Executor.java:70)

Jan 12, 2018 7:57:55 AM org.eclipse.californium.core.network.CoAPEndpoint stop
INFO: Stopping endpoint at address 0.0.0.0/0.0.0.0:5683