Description

Minimal Java Docker image focused on Java applications based on Amazon Corretto. It's use is intended for kool.dev, but can fit in any other Java use-case.

Automatically load classpath in applications using maven or gradle architecture.

Available Tags

The image built is kooldev/java which has a bunch of tags available:

16

• 16
• 16-prod

15

• 15
• 15-prod

11

• 11
• 11-prod

8

• 8
• 8-prod

Environment Variables

Variable	Default Value	Description
ASUSER	0	Changes the user id that executes the commands
UID	0	Changes the user id that executes the commands (ignored if ASUSER is provided)
VM_OPTIONS_XMS	256m	See Java Documentations
VM_OPTIONS_XMX	256m	See Java Documentations
VM_OPTIONS_MAX_METASPACE_SIZE	256m	See Java Documentations
VM_OPTIONS_PERM_SIZE	512m	See Java Documentations
VM_OPTIONS_XMN	64m	See Java Documentations
VM_OPTIONS_SURVIVOR_RATIO	128	See Java Documentations
CMS_TRIGGER_PERCENT	70	See Java Documentations
JVM_FILE_ENCODING	UTF-8	See Java Documentations
JVM_TTL	60	See Java Documentations
JVM_USER_LANGUAGE	en	See Java Documentations
JVM_USER_COUNTRY	US	See Java Documentations
TZ		Set default Timezone
JAVA_OPTIONS		Additional Java Options
RMI_SERVER_HOSTNAME		See Java Documentations
JVM_JMXREMOTE_PORT		See Java Documentations
JVM_JMXREMOTE_AUTHENTICATE		See Java Documentations
JVM_JMXREMOTE_SSL		See Java Documentations
DEBUG_PORT	9000	Debug port
DEBUG_SUSPEND	n	Suspend debug to waiting attached
CLASSPATH		Custom classpath, bay default defined by maven or gradle architecture
MAIN_CLASS		Class main, required by execute

PROD

Variable	Default Value	Description
ASUSER	0	Changes the user id that executes the commands
UID	0	Changes the user id that executes the commands (ignored if ASUSER is provided)
VM_OPTIONS_XMS	256m	See Java Documentations
VM_OPTIONS_XMX	256m	See Java Documentations
VM_OPTIONS_MAX_METASPACE_SIZE	256m	See Java Documentations
VM_OPTIONS_PERM_SIZE	512m	See Java Documentations
VM_OPTIONS_XMN	64m	See Java Documentations
VM_OPTIONS_SURVIVOR_RATIO	128	See Java Documentations
CMS_TRIGGER_PERCENT	70	See Java Documentations
JVM_FILE_ENCODING	UTF-8	See Java Documentations
JVM_TTL	60	See Java Documentations
JVM_USER_LANGUAGE	en	See Java Documentations
JVM_USER_COUNTRY	US	See Java Documentations
TZ		Set default Timezone
JAVA_OPTIONS		Additional Java Options
JAR_FILE	/app/application.jar	Jar file you application

Usage

The developer version, you need mount your volume to maven and gradle.

• $HOME/.kool/m2:/home/kool/.m2
• $HOME/.kool/gradle:/home/kool/.gradle

With kool:

In your application directory:

kool docker -e MAIN_CLASS=your.package.MainClass kooldev/java:8

To production version:

kool docker -e JAR_FILE=yout_application.jar kooldev/java:8-prod

Execute Jshell:

kool docker kooldev/java:11 jshell

With docker run:

docker run -it --rm kooldev/java:11 jshell

With docker-compose.yml:

app:
  image: kooldev/java:8
  volumes:
    - ".:/app:cached"
    - "$HOME/.ssh/id_rsa:/home/developer/.ssh/id_rsa:cached"
  environment:
    ASUSER: "${$UID}"

Contributing

Update images with templates

You should change fwd-template.json for configuration and template folder for the actual base templates.

After any changes, we need to run kool run template to parse the templates and generate all versions folder/files.

License

The MIT License (MIT). Please see License File for more information.