The Java 8 javadoc tool has a feature called -Xdoclint, which performs extra checks on the javadoc. One of these checks is to ensure that any @throws tags in the javadoc have a corresponding throws clause in Java. For example
However, version 9 of the genjavadoc plugin did not generate the throws clause for the scala @throws attribute. So, the generated java code failed the doclint checks. To get around this, doclint was turned off in commit 124151db82add3f2494f32818c29755d64b98f3c of
Version 10 of the plugin will have support for generating the throws clause from scala @throws annotations. When that is released we should update to that and enable the doclint javadoc feature.