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Setting up JDKs and Maven using SDKMAN

Setting up JDKs and Maven using SDKMAN​

Install SDKMAN​

See https://sdkman.io/install for detailed instructions.

Install JDK versions 21 and 17​

In Pulsar development, we use Amazon Corretto OpenJDK to build Pulsar.

  • JDK 21 for Pulsar version >= 3.3
    • code will be compiled for Java 17 with Java 21
    • Pulsar docker images are running Java 21 since 3.3.0
  • JDK 17 for Pulsar version >= 2.11
  • JDK 8 or 11 for Pulsar version < 2.11

Installing Amazon Corretto OpenJDK versions 21 and 17 using SDKMAN.​

# find out most recent Amazon Corretto release
sdk l java |grep amzn
# install
sdk i java 21.0.4-amzn
sdk i java 17.0.12-amzn
# switching between versions
sdk u java 17.0.12-amzn
sdk u java 21.0.4-amzn
# adding aliases
cd ~/.sdkman/candidates/java
ln -s 17.0.12-amzn 17
ln -s 21.0.4-amzn 21
# switching between versions using aliases
sdk u java 17
sdk u java 21

Setting up Java version auto-switching with SDKMAN (optional)​

With auto-switching, when there's a .sdkmanrc file in a directory, SDKMAN will switch to the defined Java version. This is convenient for developers to switch between different versions of Java.

# enable sdkman_auto_env
echo sdkman_auto_env=true >> ~/.sdkman/etc/config
# ignore .sdkmanrc files by default
echo .sdkmanrc >> ~/.gitignore_global
# enable the global ~/.gitignore_global file
git config --global core.excludesfile $HOME/.gitignore_global

# now you can add .sdkmanrc files to repository directories for automatically switching the JDK version
echo java=21 > .sdkmanrc && cd $PWD

Install Maven​

sdk i maven 3.9.9
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