Java

Tools Commands

Use JDK tools for custom runtime images, native packaging, documentation generation, and security management. Build optimized distributions for your applications.

8 commands

Pro Tips

Use jlink with '--strip-debug --compress=2' to create minimal runtime images (25-30MB).

jpackage creates native installers (.msi, .dmg, .deb) without requiring separate tools.

Run 'keytool -list -cacerts' to view trusted CA certificates in the JDK.

Common Mistakes

jlink requires fully modular applications - automatic modules may not work correctly.

Store keystore passwords securely - never commit them to version control.

Commands

Create runtime image (jlink)

$ jlink --module-path $JAVA_HOME/jmods:mods --add-modules com.myapp --output runtime

Create custom minimal JRE with only required modules.

Optimized runtime image

$ jlink --strip-debug --compress=2 --no-header-files --no-man-pages --add-modules java.base --output minimal-jre

Create minimal runtime with optimizations (~25MB).

Create native installer (jpackage)

$ jpackage --input lib --main-jar app.jar --main-class com.example.Main --name MyApp --type dmg

Create native installer (.msi, .dmg, .deb) for distribution.

Generate Javadoc

$ javadoc -d docs -sourcepath src -subpackages com.example

Generate HTML API documentation from source code.

List trusted CA certs

$ keytool -list -cacerts

List all trusted CA certificates in the JDK keystore.

Generate keystore

$ keytool -genkeypair -alias mykey -keyalg RSA -keysize 2048 -keystore keystore.jks

Generate a new key pair and self-signed certificate.

Analyze dependencies (jdeps)

$ jdeps --multi-release 17 app.jar

Analyze class and package dependencies of a JAR.

List JDK modules

$ java --list-modules

Display all modules available in the JDK.