To develop and deploy Java apps on App Engine, you need to download and install Java and Cloud SDK.
Installing Java and Cloud SDK
Download and install Java 11:
By downloading, you agree to be bound by Terms that govern use of the SDK for App Engine.
Installing optional tools
Install Java 11 tools. You can use the Maven or Gradle plugins to build, deploy, and manage your Java 11 apps:
Install an IDE or editor to develop Java apps. Popular editors include:
These editors (sometimes with the help of plugins) give you everything from syntax highlighting, intelli-sense, and code completion to fully integrated debugging capabilities.
For access to code, samples, libraries, and tools in GitHub, install Git: