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Introduction to the Labs

Welcome to the lab exercises! Before you start any of the labs, you'll need a recent "build" (161 or later) of Java 8 installed.

Java 8 Only

You must have Java 8 installed as Java 9 or later can cause problems.

Java Installation Check

Let's first make sure that your Java Development Kit (JDK) is installed and available.

At the command prompt/terminal, type the following

java -version

If all is well, you'll see something like:

java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)

And let's make sure the Java compiler (javac) is also working:

javac -version

Should result in something like:

javac 1.8.0_161


If you get a "command not found", then Java either wasn't installed properly or is not on your path. See here for installation instructions and troubleshooting.