Verify Migration Preparedness for GraalJS as default scripting engine to execute Adaptive Scripts

[aaujayasena]

Describe the issue:
From 7.1.0 uses GraalJS as the default engine for adaptive authentication scripts, replacing Nashorn [1]. This change could potentially impact customers who have developed their own adaptive functions [2]. Therefore, It would be essential to develop a migration plan and prioritize.

[1] #21182
[2] https://is.docs.wso2.com/en/next/references/extend/authentication/conditional-auth/write-custom-functions-for-conditional-authentication/

Key Considerations:

• Identify Affected Customers:Identify any customers who have implemented custom adaptive functions and are planning to migrate to IS 7.1.0.
• Migration Plan: Identify necessary changes for adaptive authentication scripts, create a detailed migration plan, and ensure resources are available to support script updates.
• Engine Switching Options: Since WSO2 Identity Server now supports three JavaScript engines—Nashorn, OpenJDK Nashorn, and GraalJS—develop and share comprehensive guidance on how to switch between these engines, including clear configuration steps.

[shanggeeth]

Required Migration Steps:

In case customers have implemented their own custom adaptive functions,

• They have to add the @HostAccess.Export imported from org.graalvm.polyglot.HostAccess package to the method of the class that is implementing @FunctionalInterface
• Alternatively they can use other script engines without the need for this code level change.

[AdaptiveAuth]
ScriptEngine = "openjdkNashorn"

[AdaptiveAuth]
ScriptEngine = "nashorn"

[nilasini]

@shanggeeth Did we create a migration doc issue? If not shall we create it?

[shanggeeth]

@shanggeeth Did we create a migration doc issue? If not shall we create it?

Migration Doc Issue: #20613

[nilasini]

closing since we are tracking with #20613

[aaujayasena]

@shanggeeth I am planning to re-test using IS 7.1.0-M6. Could we proceed?