The garbage collector value is set in the Mendix Cloud Foundry Buildpack code, as described below:

DEFAULT_GC_COLLECTOR = "Serial"
SUPPORTED_GC_COLLECTORS = ["Serial", "G1"]

jvm_garbage_collector = DEFAULT_GC_COLLECTOR
if limit >= 4096:
# override collector if memory > 4G
jvm_garbage_collector = "G1"

In some deployment types, such as Mendix Cloud, Cloud Foundry, and SAP BTP, the current value of the garbage collector (Serial or G1) can be found in the startup logs, which are the logs after restarting the environment.

In the startup logs, the Serial garbage collector is shown as follows:

• For Cloud Foundry platform apps:

INFO: JVM garbage collector is set to [Serial]

• For Kubernetes platform apps:

Picked up JAVA_TOOL_OPTIONS: XX:+UseSerialGC 

In the startup logs, the G1 garbage collector is shown as follows:

• For Cloud Foundry platform apps:

INFO: JVM garbage collector is set to [G1]

• For Kubernetes platform apps:

Picked up JAVA_TOOL_OPTIONS: XX:+UseG1GC

The default garbage collector value can be overridden by following the steps described in the article How to override the default garbage collector value in a Mendix Cloud container.