Preparing a Java Environment

AM software depends on a Java runtime environment. Check the output of the java -version command to make sure your version is supported according to Java prerequisites.

Important

It is important to keep your Java software up-to-date with the latest supported version. Make sure that your JAVA_HOME environment variable always points to the latest supported Java version.

The following table summarizes the high-level tasks required to configure your Java environment:

Task	Resources
Prepare the JDK of your choosing for AM The suggestions in these sections pertain to AM deployments with the following characteristics: The deployment has a dedicated DS server for the Core Token Service. The host running this directory server is a high-end server with a large amount of memory and multiple CPUs. The AM server is configured to use CTS-based sessions.	"Settings For Oracle Java Environments" "Settings For IBM Java Environments" "Settings for OpenJDK Java Environment"
Tune the JVM for AM ForgeRock provides guidance on how to tune the JVM for production, but you still need to tune it for garbage collection based on your environment.	"Tuning JVM Settings"

Tip

To configure JVM properties for proxy support, see "Configuring AM for Outbound Communication".

Settings For Oracle Java Environments

When using an Oracle Java environment, set at least the following options:

-Xmx1g (minimum): AM requires at least a 1 GB heap. If you are including the embedded DS, AM requires at least a 2 GB heap, as 50% of that space is allocated to DS. Higher volume and higher performance deployments require additional heap space.
-XX:MetaspaceSize=256m: Set the metaspace memory size to 256 MB.
-XX:MaxMetaspaceSize=256m: Set the maximum metaspace memory size to 256 MB.

For additional JVM tuning and security recommendations, see "Tuning JVM Settings".

Settings For IBM Java Environments

When using an IBM Java environment, set at least the following options:

-DamCryptoDescriptor.provider=IBMJCE, -DamKeyGenDescriptor.provider=IBMJCE: Use the IBM Java Cryptography Extensions.
-Xmx1g (minimum): AM requires at least a 1 GB heap. If you are including the embedded DS, AM requires at least a 2 GB heap, as 50% of that space is allocated to DS. Higher volume and higher performance deployments require additional heap space.

Settings for OpenJDK Java Environment

When using an OpenJDK Java environment, set at least the following options.

-Xmx1024m (minimum): AM requires at least a 1 GB heap. If you are including the embedded DS, AM requires at least a 2 GB heap, as 50% of that space is allocated to DS. Higher volume and higher performance deployments require additional heap space. Recommended: -Xmx2048m.
-XX:MetaspaceSize=256m: Set the initial metadata space size to 256 MB.

Tuning JVM Settings

This section gives some initial guidance on configuring the JVM for running AM when the deployment has a dedicated CTS token store, and AM is configured to use CTS-based sessions.

These settings provide a strong foundation to the JVM before a more detailed garbage collection tuning exercise, or as best practice configuration for production:

Heap Size Settings

JVM Parameters	Suggested Value	Description
`-Xms` & `-Xmx`	At least 1 GB (2 GB with embedded DS), in production environments at least 2 GB to 3 GB. This setting depends on the available physical memory, and on whether a 32- or 64-bit JVM is used.	-
`-XX:MetaspaceSize` & `-XX:MaxMetaspaceSize`	Set both to 256 MB	Controls the size of the metaspace in the JVM
`-Dsun.net.client.defaultReadTimeout`	60000	Controls the read timeout in the Java HTTP client implementation This applies only to the Sun/Oracle HotSpot JVM.
`-Dsun.net.client.defaultConnectTimeout`	High setting: 30000 (30 seconds)	Controls the connect timeout in the Java HTTP client implementation When you have hundreds of incoming requests per second, reduce this value to avoid a huge connection queue. This applies only to the Sun/Oracle HotSpot JVM.

Security Settings

JVM Parameters Suggested Value Description

-Dhttps.protocols

TLSv1.2

Controls the protocols used for outbound HTTPS connections from AM.

Specify one or more of the following values, separated by commas:

• TLSv1.2

• TLSv1.3

This setting applies only to Sun/Oracle Java environments.

-Dorg.forgerock.openam.ldap.secure.protocol.version

TLSv1.2

Controls the protocol AM uses to connect to various external resources.

Specify one or more of the following values, separated by commas:

• TLSv1.2

• TLSv1.3

This setting overrides the default server value. For details, refer to Advanced Properties

Garbage Collection Settings

JVM Parameters	Suggested Value	Description
`-verbose:gc`	-	Verbose garbage collection reporting.
`-Xlog:gc*`	`-Xlog:gc=info:file=$CATALINA_HOME/logs/gc-info.log`	Logs detailed information about garbage collection. When using the `-Xlog:gc` option, you can also specify the level, and output file.
`-XX:+HeapDumpOnOutOfMemoryError`	-	Out of Memory errors generate a heap dump automatically.
`-XX:HeapDumpPath`	`$CATALINA_HOME/logs/heapdump.hprof`	Location of the heap dump.
`-XX:+PrintClassHistogram`	-	Prints a heap histogram when the JVM receives a SIGTERM signal.