how to write lambda function in bedrock agent action group

[MouQing]

as i refer aws document from https://docs.aws.amazon.com/zh_cn/bedrock/latest/userguide/agents-lambda.html, it only shows python example code, but i do not how java/kotlin implement which handler? ,the follwing is python code
def lambda_handler(event, context):

agent = event['agent']
actionGroup = event['actionGroup']
function = event['function']
parameters = event.get('parameters', [])

response_body = {
    'TEXT': {
        'body': "sample response"
    }
}

function_response = {
    'actionGroup': event['actionGroup'],
    'function': event['function'],
    'functionResponse': {
        'responseBody': response_body
    }
}

session_attributes = event['sessionAttributes']
prompt_session_attributes = event['promptSessionAttributes']

action_response = {
    'messageVersion': '1.0', 
    'response': function_response,
    'sessionAttributes': session_attributes,
    'promptSessionAttributes': prompt_session_attributes
}
    
return action_response