Fixed broken link but still leads to nowhere of use for now.

src/docs/asciidoc/sdk.adoc

@@ -146,4 +146,4 @@ See link:https://github.com/jMonkeyEngine/jmonkeyengine/labels/roadmap[this page
 
 == A Little Bit of History
 
-The jMonkeyEngine SDK first set root during a link:http://www.jmonkeyengine.com/forum/index.php?topic=13070.0[discussion with Normen Hansen]. Although similar projects existed previously, this was the first serious attempt that had the original core team's blessing. For some time, the project was referred to merely as the "link:http://blogs.sun.com/geertjan/entry/youtube_movie_of_jmonkeyengine_on[Game Development Environment], or "GDE" for short. During alpha, we referred to it as link:http://www.jmonkeyengine.com/forum/index.php?topic=13510.0[jMonkeyPlatform], and for beta it was eventually renamed to the jMonkeyEngine SDK.
+The jMonkeyEngine SDK first set root during a link:http://www.jmonkeyengine.com/forum/index.php?topic=13070.0[discussion with Normen Hansen]. Although similar projects existed previously, this was the first serious attempt that had the original core team's blessing. For some time, the project was referred to merely as the "link:https://blogs.oracle.com/geertjan/youtube-movie-of-jmonkeyengine-on-netbeans-platform[Game Development Environment], or "GDE" for short. During alpha, we referred to it as link:http://www.jmonkeyengine.com/forum/index.php?topic=13510.0[jMonkeyPlatform], and for beta it was eventually renamed to the jMonkeyEngine SDK.