[ERROR] Hint: Check that your module inherits 'com.google.gwt.core.Core' either directly or indirectly (most often by inheriting module 'com.google.gwt.user.User')

[yurivict]

System details

RStudio Edition : Desktop
RStudio Version : 1.2.5042
OS Version      : FreeBSD 12.1
R Version       : 3.6.3

Steps to reproduce the problem

Build.

Describe the problem in detail

[ERROR] Hint: Check that your module inherits 'com.google.gwt.core.Core' either directly or indirectly (most often by inheriting module 'com.google.gwt.user.User')
### Describe the behavior you expected

See the build log: https://people.freebsd.org/~yuri/RStudio-1.2.5033.log

I observed this problem while trying to update the FreeBSD port.

[jmcphers]

--MAKE_ENV--
HOME=/wrkdirs/usr/ports/devel/RStudio/work  JAVA_HOME=/usr/local/openjdk11  

I think this JAVA_HOME is the problem. GWT 2.8 doesn't support Java 11. gwtproject/gwt#9626, and GWT 2.9 has not been released yet.

[jmcphers]

Duplicate of #6088.

[yurivict]

What Java version should RStudio be built with then?

[jmcphers]

Java 8. e.g,

rstudio/docker/jenkins/Dockerfile.bionic-amd64

Line 49 in 5a07451

openjdk-8-jdk \

[kevinushey]

FWIW, my understanding is that GWT 2.8.2 (used by RStudio v1.3+) does support Java > 8; it's just GWT 2.8.1 that doesn't support it.

We're hoping to release RStudio v1.3 soon so I think it'd be simpler to wait for our release and bump the OpenBSD build scripts then.