title: Java9 module error only in Eclipse (not IntelliJ/Gradle)
body: <p>I am getting a <code>The package javax.xml.namespace is accessible from more than one module: &lt;unnamed&gt;, java.xml</code> when trying to upgrade an app from Java8 -&gt; 11.</p>
  <p>The error, as well as potential solutions are well documented.</p>
  <p>So my question is: Why do I only get this error in Eclipse/Buildship, whereas my team mates don't see anything in IntelliJ, and the Gradle build isn't affected either.</p>
  <p>How is it that these module errors seem to be unavoidable in Eclipse, yet IntelliJ/Gradle can skip them altogether. Isn't this a restriction of the Java9 module system that should apply to any build tool?</p>