Setting up Environment

IDE Setup

• Download the IntelliJ Community Edition from http://www.jetbrains.com/idea/download/
• Import settings into IntelliJ as explained here:
  
  • Coding Standards
  • Set Imports: Preferences -> Code Style -> Java -> Imports. Uncheck "Use fully qualified class names in javadocs"

Setup command line tools and Node

On Mac, using Homebrew:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install git
brew install maven
brew install node.js

On Linux, using apt:

sudo apt update
sudo apt-get install git
sudo apt-get install maven
sudo apt-get install nodejs

Make sure git is version 1.8.x or greater installed on your machine:

$ git --version
git version 2.8.2

Please refer to Build System & CI on how to setup building of CDAP.

Creating an IntelliJ project

• Clone the CDAP project, if not done already
  • git clone git@github.com:cdapio/cdap.git
• Open IntelliJ and import the CDAP project
  
  1. Go to menu File -> Import Project ...
  2. Select the pom.xml under the CDAP directory
  3. Check Import Maven projects automatically and Automatically download: Sources, Documentations boxes in the Import Project from Maven popup.
  4. Click next and the new CDAP project will be created.

Setting up Checkstyle in IntelliJ

For more information on the rules enforced by checkstyle, see Java Coding Standards. 

Setting up Auto Copyright Header in IntelliJ

In IntelliJ, do this:

1. Go to menu IntelliJ IDEA -> Preferences…
2. Expand the Copyright setting on the left (under Project Settings)
3. Select Copyright Profiles and add a new Copyright Profile (there is a + button in the top-middle)
4. Give the profile a name (e.g. Cask Apache v2)

5. Paste the following text to the Copyright text box

   Copyright © $today.year Cask Data, Inc.
   
   Licensed under the Apache License, Version 2.0 (the "License"); you may not
   use this file except in compliance with the License. You may obtain a copy of
   the License at
   
   http://www.apache.org/licenses/LICENSE-2.0
   
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   License for the specific language governing permissions and limitations under
   the License.

6. In the Allow replacing copyright if old copyright contains box, enter Copyright.
7. Click on Copyright on the left again and add a new scope of All with the copyright profile added in above step.
8. Note: if there is an existing copyright in a file, and you are modifying the file (rather than completely replacing it), extend the copyright rather than replacing it:
   "Copyright © 2014" becomes Copyright © 2014-2016" (or similar).

Build

Git clone the CDAP repository and the Hydrator plugins:

git clone git@github.com:cdapio/cdap.git

Now build using maven:

cd cdap
mvn clean package -DskipTests

If you get compile errors similar to this one:

Exception in thread "main" java.lang.NoSuchMethodError: java.nio.ByteBuffer.mark()Ljava/nio/ByteBuffer;
        at org.eclipse.aether.connector.basic.ChecksumCalculator.update(ChecksumCalculator.java:202)

this is likely due to the version of maven that does not work properly with latest Java versions. Upgrading to maven 3.6.1 will most likely fix the problem. 

Build and run Local Standalone CDAP

Git clone the CDAP repository (if you haven't yet), and the Hydrator plugins:

git clone git@github.com:cdapio/cdap.git
git clone git@github.com:cdapio/hydrator-plugins.git

First build the plugins:

cd hydrator-plugins
git submodule update --init --recursive --remote
mvn clean package -DskipTests 

Then build the CDAP sandbox, including the plugins:

cd cdap
MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=128m" mvn clean package -pl cdap-standalone,cdap-app-templates/cdap-etl -am -amd -DskipTests -P templates,dist,release,unit-tests -Dadditional.artifacts.dir=<path to hydrator-plugins>
cd cdap-standalone/target
unzip cdap-sandbox-<version>-SNAPSHOT.zip 
cd cdap-sandbox-<version>-SNAPSHOT
cd bin
./cdap sandbox start

• The UI runs on localhost:11011
• Wrangle a sample file, build a pipeline, run it.