Here are the steps for running HJ-lib using an IDE:
Step 1:
Java 8 can be downloaded and installed from the Oracle website. You will also need a Java 8 installation on your machine and have your JAVA_HOME and PATH point to the new installation.
For e.g., I have the following on my Mac machine's .bash_profile:
JAVA8_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home
export JAVA_HOME=${JAVA8_HOME}
export PATH=$JAVA_HOME/bin:$PATH
On Windows the paths may have to be set up differently.