Eclipse Java Editor highlights the error but code compiles

Question

When using JDK 11, Eclipse 2019-03 and jaxb-api (version 2.4, latest available in maven repository), Java Editor in Eclipse highlights the line:

Answer 1

Yes, this is a bug of the Eclipse 2019-03 Java IDE (in jaxb-api javax.xml is a subpackage, which is allowed, but not a real package, which would not be allowed):

Eclipse Bug 546315 - [11] "The package […] is accessible from more than one module: , […]" error shown in Java editor by mistake

The bug has already been fixed. So either ignore it (since the code is compiled) or use a newer version like Eclipse 2019-06 (4.12).

Answer 2

This happens when you have added the external jars in the ModulePath.

Solution:

1) Remove the external jars from the node "Modulepath". 2) Select the node "Classpath" then add the external jars. 3) Review that all the jars are under the node "Classpath".