README
¶
openjdk-cnb
The Cloud Foundry OpenJDK Buildpack is a Cloud Native Buildpack V3 that provides OpenJDK JREs and JDKs to applications.
This buildpack is designed to work in collaboration with other buildpacks which request contributions of JREs and JDKs.
Behavior
This buildpack will participate if any of the following conditions are met
- Another buildpack requires
openjdk-jdk - Another buildpack requires
openjdk-jre
The buildpack will do the following if a JDK is requested:
- Contributes a JDK to a layer marked
buildandcachewith all commands on$PATH - Contributes
$JAVA_HOMEconfigured to the build layer - Contributes
$JDK_HOMEconfigure to the build layer
The buildpack will do the following if a JRE is requested:
- Contributes a JRE to a layer with all commands on
$PATH - Contributes
$JAVA_HOMEconfigured to the layer - Contributes
-XX:ActiveProcessorCountto the layer - Contributes
$MALLOC_ARENA_MAXto the layer - Disables JVM DNS caching if link-local DNS is available
- If
metadata.build = true- Marks layer as
buildandcache
- Marks layer as
- If
metadata.launch = true- Marks layer as
launch
- Marks layer as
- Contributes
jvmkillto a layer markedlaunch - Contributes Memory Calculator to a layer marked
launch
Configuration
| Environment Variable | Description |
|---|---|
$BP_JAVA_VERSION |
Configure a specific JDK or JRE version. This value must exactly match a version available in the buildpack so typically it would configured to a wildcard such as 8.*. |
$BPL_HEAD_ROOM |
Configure the percentage of headroom the memory calculator will allocated. Defaults to 0. |
$BPL_LOADED_CLASS_COUNT |
Configure the number of classes that will be loaded at runtime. Defaults to 35% of the number of classes. |
$BPL_THREAD_COUNT |
Configure the number of user threads at runtime. Defaults to 250. |
License
This buildpack is released under version 2.0 of the Apache License.
Directories
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