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Multiple jabref instances with 4.3 maintable-beta while Port 6050 is checked #4023

@bernhard-kleine

Description

@bernhard-kleine

JabRef 4.1; Windows 7 6.1 amd64; Java 1.8.0_171
JabRef 4.3-dev--snapshot--2018-05-07--maintable-beta--35b068386

Steps to reproduce:

  1. Run 4.1, run 4.3 on the same file...
  2. do some group actions in 4.3
  3. .data in the 4.1 file are lost when saving
I was very astonished to see in parallel to JabRef 4.1; Windows 7 6.1 amd64 ; Java 1.8.0_171 JabRef 4.3-dev--snapshot--2018-05-07--maintable-beta--35b068386. Both programs have the port 6500 checked and tell me that only one instance of jabref would be running. I think an error of the snapshot version which does not respect that an instance of jabref is already running.
Port is blocked
        java.net.BindException: Address already in use: JVM_Bind
	at java.net.DualStackPlainSocketImpl.bind0(Native Method)
	at java.net.DualStackPlainSocketImpl.socketBind(Unknown Source)
	at java.net.AbstractPlainSocketImpl.bind(Unknown Source)
	at java.net.PlainSocketImpl.bind(Unknown Source)
	at java.net.ServerSocket.bind(Unknown Source)
	at java.net.ServerSocket.<init>(Unknown Source)
	at org.jabref.logic.remote.server.RemoteListenerServer.<init>(RemoteListenerServer.java:26)
	at org.jabref.logic.remote.server.RemoteListenerServerThread.<init>      (RemoteListenerServerThread.java:18)
	at org.jabref.logic.remote.server.RemoteListenerServerLifecycle.open(RemoteListenerServerLifecycle.java:43)
	at org.jabref.JabRefMain.start(JabRefMain.java:163)
	at org.jabref.JabRefMain.lambda$start$0(JabRefMain.java:57)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$500(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

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