Lesson 1: JAVA_HOME is not defined correctly

[maiermic]

I tried OpenTracing Tutorial - Lesson 1, but I get an error in step 1

$ ./run.sh lesson01.exercise.Hello Bryan
Error: JAVA_HOME is not defined correctly.
  We cannot execute /usr/lib/jvm/java-11-openjdk-amd64/bin/java

[mjpieters]

I ran into this too, but running the following fixes it:

export JAVA_HOME=/usr/lib/jvm/default-java

The version in the image is not java-11, currently it's java-8. Using the default-java link should work regardless.