JDK Required to Build Jobs/Routes

Talend Open Studio for Big Data Release Notes

EnrichVersion
6.0
EnrichProdName
Talend Open Studio for Big Data
task
Installation and Upgrade
EnrichPlatform
Talend Studio

To build Jobs or Routes, you need to install a full JDK rather than a JRE. If the system fails to initialize automatically with a JDK, you can define which JDK to use by selecting Window > Preferences > Java > Installed JREs.