App Engine offers you a choice between two environments for Java applications: standard environment and flexible environment. Both environments have the same code-centric developer workflow, scale quickly and efficiently to handle increasing demand, and enable you to use Google’s proven serving technology to build your web, mobile, and IoT applications quickly and with minimal operational overhead. While the available environments have a lot in common, they differ in a few important ways.
Choose your preferred environment
Standard environment
Optimized to scale nearly instantaneously to handle huge traffic spikes.
Most cost-effective for applications that have significant periods where they are not serving traffic.
OpenJDK based Java runtime supports the standard public Java library.
Doesn't impose a security manager--your code won't be restricted by Java permissions issues.
You can run an App Engine application in two environments, the standard environment and the flexible environment. See a summary of differences between the two environments.
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