Create a custom JDK, remove unnecessary libraries

Question

How can I remove unnecessary libraries from my JDK and is this possible?

Answer 1

Yes, it is possible and documented by Oracle .

For our project, we use the following "cleanup script". Yours may differ, see Comments (for example: we do not use JavaFX).

#!/bin/sh # Remove all not-needed files, see http://www.oracle.com/technetwork/java/javase/jre-8-readme-2095710.html # Documentation rm -f jre/README.txt rm -f jre/THIRDPARTYLICENSEREADME.txt rm -f jre/THIRDPARTYLICENSEREADME-JAVAFX.txt rm -f jre/Welcome.html # optional files rm -f jre/lib/ext/jfxrt.jar rm -f jre/lib/ext/access-bridge.jar rm -f jre/lib/ext/access-bridge-32.jar rm -f jre/lib/ext/nashorn.jar rm -f jre/bin/rmid.* rm -f jre/bin/rmiregistry.* rm -f jre/bin/tnameserv.* rm -f jre/bin/keytool.* rm -f jre/bin/kinit.* rm -f jre/bin/klist.* rm -f jre/bin/ktab.* rm -f jre/bin/policytool.* rm -f jre/bin/orbd.* rm -f jre/bin/servertool.* rm -f jre/bin/javaws.* rm -f jre/lib/jfr.* # can be deleted when private application runtime is used (like launch4j) rm -f jre/bin/java.exe # launch4j uses javaw.exe. So do NOT delete! rm -f jre/bin/javacpl.exe rm -f jre/bin/jabswitch.exe rm -f jre/bin/java_crw_demo.dll rm -f jre/bin/JavaAccessBridge-32.dll rm -f jre/bin/JavaAccessBridge.dll rm -f jre/bin/JAWTAccessBridge-32.dll rm -f jre/bin/JAWTAccessBridge.dll rm -f jre/bin/WindowsAccessBridge-32.dll rm -f jre/bin/WindowsAccessBridge.dll rm -f jre/bin/wsdetect.dll rm -f jre/bin/deploy.dll rm -f jre/bin/javacpl.cpl rm -f jre/lib/deploy.jar rm -f jre/lib/plugin.jar rm -Rf /s /q jre/bin/dtplugin rm -Rf /s /q jre/bin/plugin2 rm -Rf /s /q jre/lib/deploy # JavaFX related rm -f jre/lib/javafx.properties rm -f jre/lib/jfxswt.jar rm -f jre/bin/decora_sse.dll rm -f jre/bin/fxplugins.dll rm -f jre/bin/glass.dll rm -f jre/bin/glib-lite.dll rm -f jre/bin/gstreamer-lite.dll rm -f jre/bin/javafx_font.dll 

Windows version:

 :: Remove all not-needed files, see http://www.oracle.com/technetwork/java/javase/jre-8-readme-2095710.html :: Documentation del jre\README.txt del jre\THIRDPARTYLICENSEREADME.txt del jre\THIRDPARTYLICENSEREADME-JAVAFX.txt del jre\Welcome.html :: optional files del jre\lib\ext\jfxrt.jar del jre\lib\ext\access-bridge.jar del jre\lib\ext\access-bridge-32.jar del jre\lib\ext\nashorn.jar del jre\bin\rmid.* del jre\bin\rmiregistry.* del jre\bin\tnameserv.* del jre\bin\keytool.* del jre\bin\kinit.* del jre\bin\klist.* del jre\bin\ktab.* del jre\bin\policytool.* del jre\bin\orbd.* del jre\bin\servertool.* del jre\bin\javaws.* del jre\lib\jfr.* :: can be deleted when private application runtime is used (like launch4j) del jre\bin\java.exe :: launch4j uses javaw.exe. So do NOT delete! del jre\bin\javacpl.exe del jre\bin\jabswitch.exe del jre\bin\java_crw_demo.dll del jre\bin\JavaAccessBridge-32.dll del jre\bin\JavaAccessBridge.dll del jre\bin\JAWTAccessBridge-32.dll del jre\bin\JAWTAccessBridge.dll del jre\bin\WindowsAccessBridge-32.dll del jre\bin\WindowsAccessBridge.dll del jre\bin\wsdetect.dll del jre\bin\deploy.dll del jre\bin\javacpl.cpl del jre\lib\deploy.jar del jre\lib\plugin.jar rmdir /s /q jre\bin\dtplugin rmdir /s /q jre\bin\plugin2 rmdir /s /q jre\lib\deploy :: JavaFX related del jre\lib\javafx.properties