[{"data":1,"prerenderedAt":402},["ShallowReactive",2],{"content-svc-lambda-guides-effectively-running-java-on-serverless-micronaut":3},{"markdown":4,"frontMatterAttributes":5,"bodyRaw":19,"menu":20,"menuType":393,"isCollapseableMenu":23,"nextDocItem":206,"previousDocItem":185,"contributorPaths":394,"contentName":401,"slug":205,"readingTime":37},"\u003Cp>\u003Ca href=\"https:\u002F\u002Fmicronaut.io\u002F\">Micronaut\u003C\u002Fa> is a modern JVM-based, full stack framework for building modular, \neasily testable microservice and Serverless applications. \nMicronaut is natively Cloud-native and supports ahead-of-time (AOT) compilation. \nIt has smaller startup time and minimal memory footprint. Due to AOT, a majority of framework logic is computed at compilation time.\nMicronaut eliminates reflection, runtime proxies, dynamic class loading, and type erasure problems.\nIn addition, Micronaut has the following abilities:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Supports GraalVM native images out-of-the-box\u003C\u002Fli>\n\u003Cli>Lambda SnapStart support\u003C\u002Fli>\n\u003Cli>Certifies for Amazon Corretto\u003C\u002Fli>\n\u003Cli>AWS CDK support\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>You can \u003Ca href=\"https:\u002F\u002Fmicronaut.io\u002Flaunch\">launch a Micronaut application\u003C\u002Fa> planned to run on AWS Lambda. \nApplications created from Micronaut launch page for AWS Lambda come with Lambda SnapStart support by default.  \u003C\u002Fp>\n\u003Ch4>Micronaut AWS\u003C\u002Fh4>\n\u003Cp>\u003Ca href=\"https:\u002F\u002Fmicronaut-projects.github.io\u002Fmicronaut-aws\u002Flatest\u002Fguide\u002F\">Micronaut AWS\u003C\u002Fa> provides integration between \nMicronaut application and AWS services like Amazon DynamoDB, Amazon S3, Amazon SQS, Amazon SNS, and more.\u003C\u002Fp>\n\u003Cp>Micronaut AWS also supports \u003Ca href=\"https:\u002F\u002Fmicronaut-projects.github.io\u002Fmicronaut-aws\u002Flatest\u002Fguide\u002F\">distributed configuration\u003C\u002Fa>\nvia services such as AWS Secrets Manager and AWS Parameter Store.\u003C\u002Fp>\n\u003Cp>With a simple config like below in \u003Ccode>src\u002Fmain\u002Fresources\u002Fbootstrap.yaml\u003C\u002Fcode> file you can enable a configuration client:\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">micronaut:\n  config-client:\n    enabled: true\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>Assuming you have used Secrets Manager for your RDS database secrets using AWS CDK as below:\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">Secret rdsSecret = new Secret(this, "RDSSecret", SecretProps.builder()\n  .secretName("\u002Fconfig\u002Fapplication\u002Frds")\n  .generateSecretString(SecretStringGenerator.builder()\n    .excludePunctuation(true)\n    .passwordLength(16)\n    .generateStringKey("password")\n    .secretStringTemplate("{\\"username\\": \\"" + DBConstants.DB_USER_NAME + "\\"}")\n    .build())\n  .build());\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>You can create a datasource directly using the distributed configuration that can read the values corresponding to the\nkeys present in Secrets Manager configuration.\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">micronaut:\n  config-client:\n    enabled: true\n\ndatasources:\n  default:\n    url: jdbc:mysql:\u002F\u002F${RDS_PROXY_ENDPOINT}:${port}\u002F${dbname}\n    driverClassName: com.mysql.cj.jdbc.Driver\n    username: ${username}\n    password: ${password}\n    dialect: MYSQL\n    schema-generate: CREATE\n    maximum-pool-size: 1\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>This is a very powerful feature because it abstracts the movements of secrets and credentials by directly utilizing\nAWS Secrets Manager on your behalf.\u003C\u002Fp>\n\u003Cp>The code below shows \nhow to provision a Java-based Lambda function built on Micronaut as GraalVM native image using AWS CDK:\u003C\u002Fp>\n\u003Cp>\u003Cimg src=\"\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Feffectively-running-java-on-serverless\u002Fassets\u002Fmicronaut_function.png\" alt=\"MicronautFunction\">\u003C\u002Fp>\n\u003Cp>You can learn more about building Micronaut application on AWS Lambda from the following GitHub samples:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Ca href=\"https:\u002F\u002Fgithub.com\u002Faws-samples\u002Fserverless-java-frameworks-samples\u002Ftree\u002Fmain\">serverless-java-frameworks\u003C\u002Fa>\u003C\u002Fli>\n\u003Cli>\u003Ca href=\"https:\u002F\u002Fgithub.com\u002Faws-samples\u002Fserverless-patterns\u002Ftree\u002Fmain\u002Fapigw-lambda-rds-snapstart\">api-gateway-lambda-rds-snapstart\u003C\u002Fa>\u003C\u002Fli>\n\u003C\u002Ful>\n",{"title":6,"order":7,"authors":8,"resources":11},"Micronaut",7,[9,10],"Lavanya Tangutur","Dhiraj Mahapatro",[12,16],{"link":13,"text":14,"type":15},"https:\u002F\u002Fgithub.com\u002Faws-samples\u002Fserverless-java-frameworks-samples\u002Ftree\u002Fmain","Serverless Java Frameworks","GitHub",{"link":17,"text":18,"type":15},"https:\u002F\u002Fgithub.com\u002Faws-samples\u002Fserverless-patterns\u002Ftree\u002Fmain\u002Fapigw-lambda-rds-snapstart","Micronaut with RDS","[Micronaut](https:\u002F\u002Fmicronaut.io\u002F) is a modern JVM-based, full stack framework for building modular, \neasily testable microservice and Serverless applications. \nMicronaut is natively Cloud-native and supports ahead-of-time (AOT) compilation. \nIt has smaller startup time and minimal memory footprint. Due to AOT, a majority of framework logic is computed at compilation time.\nMicronaut eliminates reflection, runtime proxies, dynamic class loading, and type erasure problems.\nIn addition, Micronaut has the following abilities:\n\n- Supports GraalVM native images out-of-the-box\n- Lambda SnapStart support\n- Certifies for Amazon Corretto\n- AWS CDK support\n\nYou can [launch a Micronaut application](https:\u002F\u002Fmicronaut.io\u002Flaunch) planned to run on AWS Lambda. \nApplications created from Micronaut launch page for AWS Lambda come with Lambda SnapStart support by default.  \n\n#### Micronaut AWS\n[Micronaut AWS](https:\u002F\u002Fmicronaut-projects.github.io\u002Fmicronaut-aws\u002Flatest\u002Fguide\u002F) provides integration between \nMicronaut application and AWS services like Amazon DynamoDB, Amazon S3, Amazon SQS, Amazon SNS, and more.\n\nMicronaut AWS also supports [distributed configuration](https:\u002F\u002Fmicronaut-projects.github.io\u002Fmicronaut-aws\u002Flatest\u002Fguide\u002F)\nvia services such as AWS Secrets Manager and AWS Parameter Store.\n\nWith a simple config like below in `src\u002Fmain\u002Fresources\u002Fbootstrap.yaml` file you can enable a configuration client:\n\n```java\nmicronaut:\n  config-client:\n    enabled: true\n```\n\nAssuming you have used Secrets Manager for your RDS database secrets using AWS CDK as below:\n\n```java\nSecret rdsSecret = new Secret(this, \"RDSSecret\", SecretProps.builder()\n  .secretName(\"\u002Fconfig\u002Fapplication\u002Frds\")\n  .generateSecretString(SecretStringGenerator.builder()\n    .excludePunctuation(true)\n    .passwordLength(16)\n    .generateStringKey(\"password\")\n    .secretStringTemplate(\"{\\\"username\\\": \\\"\" + DBConstants.DB_USER_NAME + \"\\\"}\")\n    .build())\n  .build());\n```\n\nYou can create a datasource directly using the distributed configuration that can read the values corresponding to the\nkeys present in Secrets Manager configuration.\n\n```java\nmicronaut:\n  config-client:\n    enabled: true\n\ndatasources:\n  default:\n    url: jdbc:mysql:\u002F\u002F${RDS_PROXY_ENDPOINT}:${port}\u002F${dbname}\n    driverClassName: com.mysql.cj.jdbc.Driver\n    username: ${username}\n    password: ${password}\n    dialect: MYSQL\n    schema-generate: CREATE\n    maximum-pool-size: 1\n```\n\nThis is a very powerful feature because it abstracts the movements of secrets and credentials by directly utilizing\nAWS Secrets Manager on your behalf.\n\nThe code below shows \nhow to provision a Java-based Lambda function built on Micronaut as GraalVM native image using AWS CDK:\n\n![MicronautFunction](\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Feffectively-running-java-on-serverless\u002Fassets\u002Fmicronaut_function.png)\n\nYou can learn more about building Micronaut application on AWS Lambda from the following GitHub samples:\n\n- 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