build.gradle file disappearing from project explorer but shows in navigator

[doliver3]

The build.gradle file is disappearing from the top level view in project explorer in Eclipse. The file is still there on the file system and it still shows in the Navigator view.

To reproduce load this project that has a build.gradle, pom.xml, and gradlew/gradle.bat file in the root.
https://github.com/spring-guides/gs-convert-jar-to-war/tree/master/complete

Sometime after opening the build.gradle file and after deploying to Tomcat server with Eclipse wtp, the build.gradle file just stops showing up in project explorer even though in Navigator view it is still there.

I'm using the latest Eclipse Luna 4.4 on a Mac OSX 10.

[paulvi]

It seems to be issue of Eclipse projects, I propose to raise at https://bugs.eclipse.org/bugs/

[doliver3]

Not sure why it would be an Eclipse issue rather than an eclipse gradle integration issue, but I've opened this defect there as you suggest https://bugs.eclipse.org/bugs/show_bug.cgi?id=440502