There is one instance where JUT cannot write any message to file. We cannot reproduce this bug on other instances, so maybe the problem with exact instance. What would you recommend to fix this?

Let me describe the problem:
```
$ ssh opc@100.103.0.83

$ uname -a
Linux agentinstance-20201014-1655 4.14.35-1902.306.2.el7uek.x86_64 #2 SMP Fri Aug 28 14:42:11 PDT 2020 x86_64 x86_64 x86_64 GNU/Linux

$ java -version
java version "15" 2020-09-15
Java(TM) SE Runtime Environment (build 15+36-1562)
Java HotSpot(TM) 64-Bit Server VM (build 15+36-1562, mixed mode, sharing)

$ sestatus
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: targeted
Current mode: permissive
Mode from config file: enforcing
Policy MLS status: enabled
Policy deny_unknown status: allowed
Max kernel policy version: 31

$ getenforce
Permissive

$ cd ./apps/ && cat ./com/oracle/Hi.java
/*
 * Copyright (c) 2020, 2020, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package com.oracle;
public class Hi {
    public static void main(String[] args) throws Exception {
        System.out.println("Hi!");
        Thread.sleep(2000);
    }
}
$ javac ./com/oracle/Hi.java

$ cat ./test.props
com.oracle.usagetracker.logToFile = /home/opc/apps/out.txt
com.oracle.usagetracker.verbose = true
com.oracle.usagetracker.debug = true

$ java -Dcom.oracle.usagetracker.config.file=/home/opc/apps/test.props com.oracle.Hi
UsageTracker: running synchronous.
UsageTrackerRunnable.run: VM start, javaCommand: com.oracle.Hi
Hi!

$ ls -la /home/opc/apps
drwxr-xr-x. 3 opc opc 4096 Dec 4 11:22 .
drwx------. 7 opc opc 4096 Dec 4 09:07 ..
drwxr-xr-x. 3 opc opc 20 Oct 14 17:00 com
-rw-rw-r--. 1 opc opc 136 Dec 8 17:04 test.props
```

Tried different versions of java without success. But on all other our instances (with same permissions and java versions) we can see log file with JUT output and a debug message from JUT :
```
[opc@ekazlou-cust-dev apps]$ java com.oracle.Hi
UsageTracker: running synchronous.
Hi!
UsageTracker: done sending to file.
```