[KARAF-5327] Threads not stopped on karaf.restart + bundle(0).stop()

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.2.0.M1
• Fix Version/s: 4.2.0.M1
• Component/s: karaf
• Assignee: Guillaume Nodet
• Reporter: Grzegorz Grzybek
• Created: 30/Aug/17 06:22
• Updated: 14/Sep/18 08:35
• Resolved: 30/Aug/17 15:23

Description

I was looking at:

karaf@root()> system:property karaf.restart true
karaf@root()> stop 0

I expected OSGi/Felix to be stopped, start-level go to 0 and all components/services/threads be stopped.

However when Karaf came to:

"main@7301" prio=5 tid=0x1 nid=NA runnable
  java.lang.Thread.State: RUNNABLE
	  at org.apache.karaf.main.Main.main(Main.java:170)

i.e., when Karaf decided to loop instead of System.exit() (because of karaf.restart=true), I saw the following threads remaining:

• jline

  "JLine terminal non blocking reader thread@7394" daemon prio=5 tid=0x5e nid=NA runnable
    java.lang.Thread.State: RUNNABLE
  	  at java.io.FileInputStream.readBytes(FileInputStream.java:-1)
  	  at java.io.FileInputStream.read(FileInputStream.java:255)
  	  at org.jline.utils.InputStreamReader.read(InputStreamReader.java:270)
  	  - locked <0x1ce3> (a java.io.FileInputStream)
  	  at org.jline.utils.InputStreamReader.read(InputStreamReader.java:200)
  	  at org.jline.utils.NonBlockingReader.run(NonBlockingReader.java:276)
  	  at java.lang.Thread.run(Thread.java:748)
  

• shutdown socket thread

  "Karaf Shutdown Socket Thread@7393" daemon prio=5 tid=0x18 nid=NA runnable
    java.lang.Thread.State: RUNNABLE
  	  at java.net.PlainSocketImpl.socketAccept(PlainSocketImpl.java:-1)
  	  at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409)
  	  at java.net.ServerSocket.implAccept(ServerSocket.java:545)
  	  at java.net.ServerSocket.accept(ServerSocket.java:513)
  	  at org.apache.karaf.main.ShutdownSocketThread.run(ShutdownSocketThread.java:57)
  

(In fabric8v1 I also saw jetty threads running, but it's pax-web fault).