FULL PRODUCT VERSION :
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Ubuntu 14.04.5 LTS

EXTRA RELEVANT SYSTEM CONFIGURATION :
Build language: java
Build group: edge
Build dist: trusty
Build id: 267456218
Job id: 267456220
Runtime kernel version: 4.4.0-92-generic
travis-build version: 3bdfb53ac
Build image provisioning date and time
Tue Aug 22 18:54:38 UTC 2017
Operating System Details
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
Cookbooks Version
5c6d733 https://github.com/travis-ci/travis-cookbooks/tree/5c6d733
git version
git version 2.14.1
bash version
GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)
gcc version
gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
docker version
Client:
 Version: 17.03.1-ce
 API version: 1.27
 Go version: go1.7.5
 Git commit: c6d412e
 Built: Mon Mar 27 17:10:36 2017
 OS/Arch: linux/amd64
Server:
 Version: 17.03.1-ce
 API version: 1.27 (minimum version 1.12)
 Go version: go1.7.5
 Git commit: c6d412e
 Built: Mon Mar 27 17:10:36 2017
 OS/Arch: linux/amd64
 Experimental: false
clang version
clang version 3.9.0 (tags/RELEASE_390/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-3.9.0/bin
jq version
jq-1.5
bats version
Bats 0.4.0
shellcheck version
0.4.6
shfmt version
v1.3.1
ccache version
ccache version 3.1.9
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Copyright (C) 2009-2011 Joel Rosdahl
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cmake version
cmake version 3.2.2
CMake suite maintained and supported by Kitware (kitware.com/cmake).
heroku version
heroku-cli/6.13.18-a444c52 (linux-x64) node-v8.3.0
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4.2
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mysql version
mysql Ver 14.14 Distrib 5.6.33, for debian-linux-gnu (x86_64) using EditLine wrapper
openssl version
OpenSSL 1.0.1f 6 Jan 2014
packer version
Packer v1.0.2
Your version of Packer is out of date! The latest version
is 1.0.4. You can update by downloading from www.packer.io
postgresql client version
psql (PostgreSQL) 9.6.4
ragel version
Ragel State Machine Compiler version 6.8 Feb 2013
Copyright (c) 2001-2009 by Adrian Thurston
subversion version
svn, version 1.8.8 (r1568071)
   compiled Aug 10 2017, 17:20:39 on x86_64-pc-linux-gnu
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This software consists of contributions made by many people;
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The following repository access (RA) modules are available:
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  - with Cyrus SASL authentication
  - handles 'svn' scheme
* ra_local : Module for accessing a repository on local disk.
  - handles 'file' scheme
* ra_serf : Module for accessing a repository via WebDAV protocol using serf.
  - using serf 1.3.3
  - handles 'http' scheme
  - handles 'https' scheme
sudo version
Sudo version 1.8.9p5
Configure options: --prefix=/usr -v --with-all-insults --with-pam --with-fqdn --with-logging=syslog --with-logfac=authpriv --with-env-editor --with-editor=/usr/bin/editor --with-timeout=15 --with-password-timeout=0 --with-passprompt=[sudo] password for %p: --without-lecture --with-tty-tickets --disable-root-mailer --enable-admin-flag --with-sendmail=/usr/sbin/sendmail --with-timedir=/var/lib/sudo --mandir=/usr/share/man --libexecdir=/usr/lib/sudo --with-sssd --with-sssd-lib=/usr/lib/x86_64-linux-gnu --with-selinux
Sudoers policy plugin version 1.8.9p5
Sudoers file grammar version 43
Sudoers path: /etc/sudoers
Authentication methods: 'pam'
Syslog facility if syslog is being used for logging: authpriv
Syslog priority to use when user authenticates successfully: notice
Syslog priority to use when user authenticates unsuccessfully: alert
Send mail if the user is not in sudoers
Use a separate timestamp for each user/tty combo
Lecture user the first time they run sudo
Root may run sudo
Allow some information gathering to give useful error messages
Require fully-qualified hostnames in the sudoers file
Visudo will honor the EDITOR environment variable
Set the LOGNAME and USER environment variables
Length at which to wrap log file lines (0 for no wrap): 80
Authentication timestamp timeout: 15.0 minutes
Password prompt timeout: 0.0 minutes
Number of tries to enter a password: 3
Umask to use or 0777 to use user's: 022
Path to mail program: /usr/sbin/sendmail
Flags for mail program: -t
Address to send mail to: root
Subject line for mail messages: *** SECURITY information for %h ***
Incorrect password message: Sorry, try again.
Path to authentication timestamp dir: /var/lib/sudo
Default password prompt: [sudo] password for %p:
Default user to run commands as: root
Value to override user's $PATH with: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
Path to the editor for use by visudo: /usr/bin/editor
When to require a password for 'list' pseudocommand: any
When to require a password for 'verify' pseudocommand: all
File descriptors >= 3 will be closed before executing a command
Environment variables to check for sanity:
TZ
TERM
LINGUAS
LC_*
LANGUAGE
LANG
COLORTERM
Environment variables to remove:
RUBYOPT
RUBYLIB
PYTHONUSERBASE
PYTHONINSPECT
PYTHONPATH
PYTHONHOME
TMPPREFIX
ZDOTDIR
READNULLCMD
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FPATH
PERL5DB
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PERLIO_DEBUG
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SHELLOPTS
GLOBIGNORE
PS4
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ENV
TERMCAP
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TERMINFO_DIRS
TERMINFO
_RLD*
LD_*
PATH_LOCALE
NLSPATH
HOSTALIASES
RES_OPTIONS
LOCALDOMAIN
CDPATH
IFS
Environment variables to preserve:
JAVA_HOME
TRAVIS
CI
DEBIAN_FRONTEND
XAUTHORIZATION
XAUTHORITY
PS2
PS1
PATH
LS_COLORS
KRB5CCNAME
HOSTNAME
HOME
DISPLAY
COLORS
Locale to use while parsing sudoers: C
Directory in which to store input/output logs: /var/log/sudo-io
File in which to store the input/output log: %{seq}
Add an entry to the utmp/utmpx file when allocating a pty
PAM service name to use
PAM service name to use for login shells
Create a new PAM session for the command to run in
Maximum I/O log sequence number: 0
Local IP address and netmask pairs:
10.240.0.10/255.255.255.255
172.17.0.1/255.255.0.0
Sudoers I/O plugin version 1.8.9p5
gzip version
gzip 1.6
Copyright (C) 2007, 2010, 2011 Free Software Foundation, Inc.
Copyright (C) 1993 Jean-loup Gailly.
This is free software. You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.
Written by Jean-loup Gailly.
zip version
Copyright (c) 1990-2008 Info-ZIP - Type 'zip "-L"' for software license.
This is Zip 3.0 (July 5th 2008), by Info-ZIP.
Currently maintained by E. Gordon. Please send bug reports to
the authors using the web page at www.info-zip.org; see README for details.
Latest sources and executables are at ftp://ftp.info-zip.org/pub/infozip,
as of above date; see http://www.info-zip.org/ for other sites.
Compiled with gcc 4.8.2 for Unix (Linux ELF) on Oct 21 2013.
Zip special compilation options:
USE_EF_UT_TIME (store Universal Time)
BZIP2_SUPPORT (bzip2 library version 1.0.6, 6-Sept-2010)
bzip2 code and library copyright (c) Julian R Seward
(See the bzip2 license for terms of use)
SYMLINK_SUPPORT (symbolic links supported)
LARGE_FILE_SUPPORT (can read and write large files on file system)
ZIP64_SUPPORT (use Zip64 to store large files in archives)
UNICODE_SUPPORT (store and read UTF-8 Unicode paths)
STORE_UNIX_UIDs_GIDs (store UID/GID sizes/values using new extra field)
UIDGID_NOT_16BIT (old Unix 16-bit UID/GID extra field not used)
[encryption, version 2.91 of 05 Jan 2007] (modified for Zip 3)
Encryption notice:
The encryption code of this program is not copyrighted and is
put in the public domain. It was originally written in Europe
and, to the best of our knowledge, can be freely distributed
in both source and object forms from any country, including
the USA under License Exception TSU of the U.S. Export
Administration Regulations (section 740.13(e)) of 6 June 2002.
Zip environment options:
             ZIP: [none]
          ZIPOPT: [none]
vim version
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Nov 24 2016 16:43:18)
Included patches: 1-52
Extra patches: 8.0.0056
Modified by pkg-vim-maintainers@lists.alioth.debian.org
Compiled by buildd@
Huge version without GUI. Features included (+) or not (-):
+acl +farsi +mouse_netterm +syntax
+arabic +file_in_path +mouse_sgr +tag_binary
+autocmd +find_in_path -mouse_sysmouse +tag_old_static
-balloon_eval +float +mouse_urxvt -tag_any_white
-browse +folding +mouse_xterm -tcl
++builtin_terms -footer +multi_byte +terminfo
+byte_offset +fork() +multi_lang +termresponse
+cindent +gettext -mzscheme +textobjects
-clientserver -hangul_input +netbeans_intg +title
-clipboard +iconv +path_extra -toolbar
+cmdline_compl +insert_expand -perl +user_commands
+cmdline_hist +jumplist +persistent_undo +vertsplit
+cmdline_info +keymap +postscript +virtualedit
+comments +langmap +printer +visual
+conceal +libcall +profile +visualextra
+cryptv +linebreak +python +viminfo
+cscope +lispindent -python3 +vreplace
+cursorbind +listcmds +quickfix +wildignore
+cursorshape +localmap +reltime +wildmenu
+dialog_con -lua +rightleft +windows
+diff +menu -ruby +writebackup
+digraphs +mksession +scrollbind -X11
-dnd +modify_fname +signs -xfontset
-ebcdic +mouse +smartindent -xim
+emacs_tags -mouseshape -sniff -xsmp
+eval +mouse_dec +startuptime -xterm_clipboard
+ex_extra +mouse_gpm +statusline -xterm_save
+extra_search -mouse_jsbterm -sun_workshop -xpm
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
  fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,--as-needed -o vim -lm -ltinfo -lnsl -lselinux -lacl -lattr -lgpm -ldl -L/usr/lib/python2.7/config-x86_64-linux-gnu -lpython2.7 -lpthread -ldl -lutil -lm -Xlinker -export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions
iptables version
iptables v1.4.21
curl version
curl 7.35.0 (x86_64-pc-linux-gnu) libcurl/7.35.0 OpenSSL/1.0.1f zlib/1.2.8 libidn/1.28 librtmp/2.3
wget version
GNU Wget 1.15 built on linux-gnu.
rsync version
rsync version 3.1.0 protocol version 31
gimme version
v1.2.0
nvm version
0.33.2
perlbrew version
/home/travis/perl5/perlbrew/bin/perlbrew - App::perlbrew/0.73
phpenv version
rbenv 1.1.1-2-g615f844
rvm version
rvm 1.29.2 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io/]
default ruby version
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]
CouchDB version
couchdb 1.6.1
ElasticSearch version
5.5.0
Installed Firefox version
firefox 54.0.1
MongoDB version
MongoDB 3.2.16
Pre-installed PostgreSQL versions
9.2.22
9.3.18
9.4.13
9.5.8
9.6.4
RabbitMQ Version
3.6.11
Redis version
redis-server 4.0.1
riak version
2.2.3
kerl list installations
17.0
17.1
17.3
17.4
17.5
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18.1
18.2
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R14B02
R14B03
R14B04
R15B
R15B01
R15B02
R15B03
R16B
R16B01
R16B02
R16B03
R16B03-1
kiex list
kiex elixirs
   elixir-1.0.3
=* elixir-1.0.4
# => - current
# =* - current && default
# * - default
rebar --version
rebar 2.6.4 17 20160831_145136 git 2.6.4-dirty
Pre-installed Go versions
1.3.3
1.4.3
1.5.4
1.6.4
1.7.4
ant version
Apache Ant(TM) version 1.9.3 compiled on April 8 2014
mvn version
Apache Maven 3.5.0 (ff8f5e7444045639af65f6095c62210b5713f426; 2017-04-03T19:39:06Z)
Maven home: /usr/local/maven-3.5.0
Java version: 1.8.0_144, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-8-oracle/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "4.4.0-81-generic", arch: "amd64", family: "unix"
gradle version
------------------------------------------------------------
Gradle 4.0.1
------------------------------------------------------------
Build time: 2017-07-07 14:02:41 UTC
Revision: 38e5dc0f772daecca1d2681885d3d85414eb6826
Groovy: 2.4.11
Ant: Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM: 1.8.0_144 (Oracle Corporation 25.144-b01)
OS: Linux 4.4.0-81-generic amd64
lein version
WARNING: You're currently running as root; probably by accident.
Press control-C to abort or Enter to continue as root.
Set LEIN_ROOT to disable this warning.
Leiningen 2.7.1 on Java 1.8.0_144 Java HotSpot(TM) 64-Bit Server VM
Pre-installed Node.js versions
v0.12.18
v4.7.2
v4.8.4
v5.12.0
v6.11.2
v6.9.4
v7.4.0
v8.1
perlbrew list
  5.8 (5.8.8)
  5.10 (5.10.1)
  5.12 (5.12.5)
  5.14 (5.14.4)
  5.16 (5.16.3)
  5.18 (5.18.4)
  5.20 (5.20.3)
  5.20-extras (5.20.3)
  5.20-shrplib (5.20.3)
  5.20.3
  5.22 (5.22.0)
  5.22-extras (5.22.0)
  5.22-shrplib (5.22.0)
  5.22.0
phpenv versions
  system
  5.4
  5.4.45
  5.5.37
  5.6
* 5.6.24 (set by /home/travis/.phpenv/version)
  7.0
  7.0.7
  hhvm
  hhvm-stable
composer --version
Composer version 1.2.0 2016-07-19 01:28:52
Pre-installed Ruby versions
jruby-9.1.9.0
ruby-2.1.10
ruby-2.2.7
ruby-2.3.4
ruby-2.4.1
$ jdk_switcher use oraclejdk8
Switching to Oracle JDK8 (java-8-oracle), JAVA_HOME will be set to /usr/lib/jvm/java-8-oracle
W: http://dl.hhvm.com/ubuntu/dists/trusty/InRelease: Signature by key 36AEF64D0207E7EEE352D4875A16E7281BE7A449 uses weak digest algorithm (SHA1)
W: http://ppa.launchpad.net/couchdb/stable/ubuntu/dists/trusty/Release.gpg: Signature by key 15866BAFD9BCC4F3C1E0DFC7D69548E1C17EAB57 uses weak digest algorithm (SHA1)
Patching redis-server init script
git.checkout
0.58s$ git clone --depth=50 --branch=master https://github.com/Pr0methean/BetterRandom.git Pr0methean/BetterRandom
Cloning into 'Pr0methean/BetterRandom'...
remote: Counting objects: 678, done.
remote: Compressing objects: 100% (327/327), done.
remote: Total 678 (delta 404), reused 524 (delta 256), pack-reused 0
Receiving objects: 100% (678/678), 168.92 KiB | 3.38 MiB/s, done.
Resolving deltas: 100% (404/404), done.
$ cd Pr0methean/BetterRandom
$ git checkout -qf 6badb575b988c8354ebcb415835dcdfdba2062e8
Disabling Gradle daemon
0.01s$ mkdir -p ~/.gradle && echo "org.gradle.daemon=false" >> ~/.gradle/gradle.properties
$ export PATH=$JAVA_HOME/bin:$PATH
$ java -Xmx32m -version
Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
$ javac -J-Xmx32m -version
Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m
javac 1.8.0_144

A DESCRIPTION OF THE PROBLEM :
Oracle Java 8 gives me a ConcurrentModificationException where OpenJDK 8 does not, on a map that is wrapped by, and accessed only through, Collections.synchronizedMap. It also gives "java.lang.IllegalStateException: Duplicate key true" where OpenJDK 8 does not, and where I am not using Boolean-type keys.

REGRESSION. Last worked in version 8u121

ADDITIONAL REGRESSION INFORMATION:
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Clone https://github.com/Pr0methean/BetterRandom.git at commit 6badb575b988c8354ebcb415835dcdfdba2062e8
2. Run mvn test

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The tests give the same result on Oracle JDK 8 as they do on OpenJDK 8.
ACTUAL -
The tests pass on OpenJDK 8 and fail on Oracle JDK 8.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "Thread-1" java.util.ConcurrentModificationException
at java.util.WeakHashMap$HashIterator.nextEntry(WeakHashMap.java:806)
at java.util.WeakHashMap$KeyIterator.next(WeakHashMap.java:839)
at betterrandom.seed.RandomSeederThread.run(RandomSeederThread.java:84)
Tests run: 178, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 10.946 sec <<< FAILURE!
testSerialization(betterrandom.prng.adapter.ReseedingSplittableRandomAdapterTest) Time elapsed: 0.05 sec <<< FAILURE!
java.lang.IllegalStateException: Duplicate key true
at java.util.stream.Collectors.lambda$throwingMerger$0(Collectors.java:133)
at java.util.HashMap.merge(HashMap.java:1253)
at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320)
at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
at java.util.WeakHashMap$KeySpliterator.forEachRemaining(WeakHashMap.java:1137)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at betterrandom.seed.RandomSeederThread.writeObject(RandomSeederThread.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at betterrandom.prng.RandomTestUtils.serializeAndDeserialize(RandomTestUtils.java:176)
at betterrandom.prng.adapter.SingleThreadSplittableRandomAdapterTest.testSerialization(SingleThreadSplittableRandomAdapterTest.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:661)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:869)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1193)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:126)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
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)
Results :
Failed tests:
  ReseedingSplittableRandomAdapterTest>SingleThreadSplittableRandomAdapterTest.testSerialization:31 » IllegalState

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
See https://github.com/Pr0methean/BetterRandom.git at commit 6badb575b988c8354ebcb415835dcdfdba2062e8
---------- END SOURCE ----------