### Is there an existing issue for this?

[iambary44]

Is there an existing issue for this?

• I have searched the existing issues

Enhancement description

Currently, Java 21 preview is provided according to this comment. It would be nice to support it via LocalStack and start testing it.

🧑‍💻 Implementation

I think java21-preview should be added here

So, the code below should work.

var createFunctionRequest = CreateFunctionRequest.builder()
			.functionName(fnName)
			.runtime("java21-preview")
			.role("arn:aws:iam::123456789012:role/irrelevant")
			.packageType(PackageType.ZIP)
			.code(FunctionCode.builder()
				.zipFile(SdkBytes.fromByteArray(FileUtils.readFileToByteArray(new File(jar))))
				.build())
			.timeout(10)
			.handler("org.springframework.cloud.function.adapter.aws.FunctionInvoker::handleRequest")
			.environment(Environment.builder().variables(envVars).build())
			.build();

Anything else?

It can be tested with this java project

Originally posted by @eddumelendez in localstack/localstack#9330