13-May-2020 17:25:06.868 WARNING [Catalina-utility-2] org.apache.catalina.users.MemoryUserDatabase.backgroundProcess Failed to close [conf/tomcat-users.xml]
        java.io.FileNotFoundException: /path/to/conf/tomcat-users.xml (Too many open files)
                at java.io.FileInputStream.open0(Native Method)
                at java.io.FileInputStream.open(FileInputStream.java:195)
                at java.io.FileInputStream.<init>(FileInputStream.java:138)
                at java.io.FileInputStream.<init>(FileInputStream.java:93)
                at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
                at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
                at org.apache.catalina.users.MemoryUserDatabase.backgroundProcess(MemoryUserDatabase.java:685)
                at org.apache.catalina.realm.UserDatabaseRealm.backgroundProcess(UserDatabaseRealm.java:143)
                at org.apache.catalina.realm.CombinedRealm.backgroundProcess(CombinedRealm.java:299)
                at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1137)
                at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1353)
                at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1335)
                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:1142)
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
                at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
                at java.lang.Thread.run(Thread.java:745)
13-May-2020 17:25:16.869 WARNING [Catalina-utility-1] org.apache.catalina.users.MemoryUserDatabase.backgroundProcess Failed to close [conf/tomcat-users.xml]
        java.io.FileNotFoundException: /path/to/conf/tomcat-users.xml (Too many open files)
                at java.io.FileInputStream.open0(Native Method)
                at java.io.FileInputStream.open(FileInputStream.java:195)
                at java.io.FileInputStream.<init>(FileInputStream.java:138)
                at java.io.FileInputStream.<init>(FileInputStream.java:93)
                at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
                at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
                at org.apache.catalina.users.MemoryUserDatabase.backgroundProcess(MemoryUserDatabase.java:685)
                at org.apache.catalina.realm.UserDatabaseRealm.backgroundProcess(UserDatabaseRealm.java:143)
                at org.apache.catalina.realm.CombinedRealm.backgroundProcess(CombinedRealm.java:299)
                at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1137)
                at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1353)
                at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1335)
                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:1142)
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
                at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
                at java.lang.Thread.run(Thread.java:745)
13-May-2020 17:25:26.871 WARNING [Catalina-utility-1] org.apache.catalina.users.MemoryUserDatabase.backgroundProcess Failed to close [conf/tomcat-users.xml]
        java.io.FileNotFoundException: /path/to/conf/tomcat-users.xml (Too many open files)
                at java.io.FileInputStream.open0(Native Method)
                at java.io.FileInputStream.open(FileInputStream.java:195)