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openflowplugin exceptions when starting about 60 virtual switches

I am using opendaylight beryllium-sr4 for learning, and I connected about 60 virtual switches through mininet(2.3.0d1, compile from master branch), then I got such error:

opendaylight-user@root>Exception in thread "Thread-368" java.util.concurrent.RejectedExecutionException: Task org.opendaylight.openflowplugin.openflow.md.core.HandshakeStepWrapper@57f076ad rejected from org.opendaylight.openflowplugin.openflow.md.core.ThreadPoolLoggingExecutor@12f2e237[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:823)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1369)
    at org.opendaylight.openflowplugin.openflow.md.core.ConnectionConductorImpl.onConnectionReady(ConnectionConductorImpl.java:451)
    at org.opendaylight.openflowjava.protocol.impl.core.connection.ConnectionAdapterImpl$1.run(ConnectionAdapterImpl.java:185)
    at java.lang.Thread.run(Thread.java:745)

openflowplugin exceptions when starting about 60 virtual switches

I am using opendaylight beryllium-sr4 for learning, and I connected about 60 virtual switches through mininet(2.3.0d1, compile from master branch), then I got such error:

opendaylight-user@root>Exception in thread "Thread-368" java.util.concurrent.RejectedExecutionException: Task org.opendaylight.openflowplugin.openflow.md.core.HandshakeStepWrapper@57f076ad rejected from org.opendaylight.openflowplugin.openflow.md.core.ThreadPoolLoggingExecutor@12f2e237[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:823)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1369)
    at org.opendaylight.openflowplugin.openflow.md.core.ConnectionConductorImpl.onConnectionReady(ConnectionConductorImpl.java:451)
    at org.opendaylight.openflowjava.protocol.impl.core.connection.ConnectionAdapterImpl$1.run(ConnectionAdapterImpl.java:185)
    at java.lang.Thread.run(Thread.java:745)