Developing a new library: error while creating javadoc and some general question

Here are two possible solutions:

  1. remove this line from build.xml.

    <taglet name="ExampleTaglet" path="resources/code" />

  2. make sure that the Eclipse project is using Java 8 – not just targeting 8 but using a built-in Java 10 or 11. Under Your project > Properties > Java Build Path > Libraries, confirm that you see JavaSE 1.8