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Guía para crear heap dumps y thread dumps en Java en SAP BTP Cloud Foundry
- Creado 01/03/2024
- Modificado 01/03/2024
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Java heap dumps and thread dumps are a powerful way to investigate what's going on in the Java Virtual Machine (JVM). A heap dump allows you to see what is kept in memory after a minor and major garbage collection. Therefore, heap dumps provide indispensable insights which can be used for troubleshooting memory leaks.
This blog post is the third and final part (following part 1 and part 2 ) of our blog series focusing on Java memory management in container environments. We will show how to create heap dumps and thread dumps on demand for Java applications running on SAP BTP Cloud Foundry.
Heap dumps can be created on demand by requesting them from the JVM via tools like
The
You can add the
Once installed, you can call the
This blog post is the third and final part (following part 1 and part 2 ) of our blog series focusing on Java memory management in container environments. We will show how to create heap dumps and thread dumps on demand for Java applications running on SAP BTP Cloud Foundry.
The cf java plugin
Heap dumps can be created on demand by requesting them from the JVM via tools like
jvmmon
or
jcmd
. Which tool and command to use depends on the JVM vendor as well as the Java buildpack which is used on SAP BTP Cloud Foundry. To make it as simple as possible to create heap dumps and thread dumps on demand, we've created the
cf java
plugin
plugin.
The
cf java
plugin is installed as an addition to the
Cloud Foundry Command Line Interface (CF CLI)
, which is used to manage applications on SAP BTP Cloud Foundry.
You can add the
cf java
plugin via the command line:
$ cf add-plugin-repo CF-Community http://plugins.cloudfoundry.org
$ cf install-plugin -r CF-Community "java"Once installed, you can call the
cf java
plugin. To view all commands and options supported by the plugin, you can run
cf java --help
:
$ cf java --help
NAME:
java - Obtain a heap-dump or thread-dump from a running, SSH-enabled Java application.
USAGE:
cf java [heap-dump|thread-dump] APP_NAME
OPTIONS:
--app-instance-index -i [index], select to which instance of the app to connect
--container-dir -cd, the directory path in the container that the heap dump file will be saved to
--dry-run -n, just output to command line what would be executed
--keep -k, keep the heap dump in the container; by default the heap dump will be deleted from the container's filesystem after been downloaded
--local-dir -ld, the local directory path that the dump file will be saved to
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