Project Kulla

Official homepage
Check out the official page on Kulla at http://openjdk.java.net/projects/kulla/

JEP related to Kulla
https://bugs.openjdk.java.net/browse/JDK-8043364

Feedback
View or add your comments to the recent LJC hackday feedback by the attendees.

Download binaries
JDK9 binaries: http://jdk.java.net/9/
Kulla.jar: Adopt OpenJDK Cloudbees Build farm [dead-link]

MacOS users
If you do not want to make JDK9 as the primary Java on your MacOS, here's something to try out.

What JDK am I using ?

// Tells you which JDKs you have
$ /usr/libexec/java_home -verbose

Can I set JDK8 or JDK9 to be my default JAVA_HOME each time I log into my terminal ?

// You can set that export command in your ~/.profile
// and/or ~/.bashrc to permanently set JAVA_HOME
// for all shells/terminals/applications.
export JAVA_HOME="`/usr/libexec/java_home -v '1.8*'`"

// Set JAVA_HOME to be Java 9 for the terminal
// window you are in
export JAVA_HOME="`/usr/libexec/java_home -v '1.9*'`"

Linux/MacOS users
How can I switch between different versions of the JDK if I have multiple of them ?

Add the below to your .bashrc or .bash_profile:

export JAVA9_HOME=/path/to/jdk1.9.0
export JAVA8_HOME=/path/to/jdk1.8.0
export JAVA7_HOME=/path/to/jdk1.7.0
export JAVA6_HOME=/path/to/jdk1.6.0
export JAVA_HOME=$JAVA7_HOME
export JDK_HOME=$JAVA7_HOME

function go9 {
    export JAVA_HOME=$JAVA9_HOME
    export JDK_HOME=$JAVA_HOME
    echo "Switched to $JAVA_HOME"
    export PATH="$JAVA_HOME/bin:$PATH"
}

function go8 {
    export JAVA_HOME=$JAVA8_HOME
    export JDK_HOME=$JAVA_HOME
    echo "Switched to $JAVA_HOME"
    export PATH="$JAVA_HOME/bin:$PATH"
}

function go7 {
    export JAVA_HOME=$JAVA7_HOME
    export JDK_HOME=$JAVA_HOME
    echo "Switched to $JAVA_HOME"
    export PATH="$JAVA_HOME/bin:$PATH"
}

function go6 {
    export JAVA_HOME=$JAVA6_HOME
    export JDK_HOME=$JAVA_HOME
    echo "Switched to $JAVA_HOME"
    export PATH="$JAVA_HOME/bin:$PATH"
}

Getting started

Running kulla.jar

set JAVA_HOME to point to /path/JDK9/

$ java -jar ~/sources/kulla/kulla.jar

| Welcome to the Java REPL -- Version 0.411
| Type /help for help

->|

/help options

-> /help
Type a Java language expression, statement, or declaration.
Or type one of the following commands:

{
. 
.
. 
  [Options]
. 
.
. 
}

Supported shortcuts include:
<tab> -- show possible completions for the current text
Shift-<tab> -- for current method or constructor invocation, show a synopsis of the method/constructor

Slides [soon to be published]

Exercises

Other mentions of REPL

Building the Kulla dev branch of OpenJDK9 

hg clone http://hg.openjdk.java.net/kulla/dev kulla-dev
cd kulla-dev
sh get_sources.sh
bash configure --with-boot-jdk=/path/to/jdk1.8.0
make clean images
make install  <=== optional

Ensure that the path to the JDK built with the above steps is set to the JAVA_HOME and PATH environment variables.

Download JLINE2 from Maven, and set the environment variable JLINE2LIB to point to the downloaded jar file.

To compile and run Kulla, see http://hg.openjdk.java.net/kulla/dev/langtools/file/4933dc482be7/repl/README or download this Maven pom.xml and place it in the $HOME/sources/kulla-dev/langtools/repl/ folder.

Other good guides to building Kulla from scratch, see this JClarity's post and Arun Gupta's post. And a nice and short blog post from Greg Bakos.

Gotachas

Clear the terminal window
MacOS: CMD-K
Linux: Ctrl-K or Ctrl-L

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