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An unexpected exception occurred: Too many open files

Hi All,

We are using openfire 4.1.4. And we are getting a lot of “An unexpected exception occurred: Too many open files” error in logs.

2018.07.25 19:28:05 org.jivesoftware.openfire.container.PluginMonitor - An unexpected exception occurred:
java.nio.file.FileSystemException: /opt/openfire/plugins: Too many open files
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:91)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at sun.nio.fs.UnixFileSystemProvider.newDirectoryStream(UnixFileSystemProvider.java:427)
at java.nio.file.Files.newDirectoryStream(Files.java:589)
at org.jivesoftware.openfire.container.PluginMonitor$MonitorTask.run(PluginMonitor.java:136)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

Thanks.

Please let me know what is the root cause and how we can prevent it?