{"componentChunkName":"component---packages-blog-core-src-templates-post-js","path":"/dockerize-java-application/","result":{"data":{"post":{"__typename":"MdxArticleProxy","id":"7541e31d-c551-55e4-8e37-898dc9986114","title":"Dockerize Java Application","slug":"/dockerize-java-application/","link":null,"excerpt":"How to dockerize the Java application Create Hello World Program in Java Prepare Dockerfile to build…","timeToRead":1,"featured":null,"thumbnailText":null,"date":"April 13, 2020","category":{"__typename":"CategoriesJson","id":"9b34403c-9fbf-5755-b813-562840b22307","name":"Programming","slug":"/category/programming/","color":null,"icon":"/static/e4c25de42623633b3496afca3ce01e06/programming.svg"},"author":{"__typename":"AuthorsJson","id":"cb7eeca4-38c9-5674-90b7-7e96c482987b","name":"Arvind Pandey","slug":"/author/arvind-pandey/","title":"Software Engineer","description":"Specialized in Software Design, Development, and Engineering Leadership.","skills":["Javascript","React","Node.js"],"social":[{"name":"Github","url":"https://github.com/arvind3157"},{"name":"Twitter","url":"https://twitter.com/arvpande"},{"name":"Linkedin","url":"https://www.linkedin.com/in/arvpande/"}],"thumbnail":{"__typename":"ImageSharp","regular":{"width":150,"height":150,"src":"/static/1cf0ccf6c2ce94576dce6b324f5995d6/a9ab2/arvind-pandey.jpg","srcSet":"/static/1cf0ccf6c2ce94576dce6b324f5995d6/a9ab2/arvind-pandey.jpg 1x,\n/static/1cf0ccf6c2ce94576dce6b324f5995d6/3fb33/arvind-pandey.jpg 1.5x,\n/static/1cf0ccf6c2ce94576dce6b324f5995d6/d7080/arvind-pandey.jpg 2x","srcWebp":"/static/1cf0ccf6c2ce94576dce6b324f5995d6/a3d54/arvind-pandey.webp","srcSetWebp":"/static/1cf0ccf6c2ce94576dce6b324f5995d6/a3d54/arvind-pandey.webp 1x,\n/static/1cf0ccf6c2ce94576dce6b324f5995d6/cc134/arvind-pandey.webp 1.5x,\n/static/1cf0ccf6c2ce94576dce6b324f5995d6/3cb0e/arvind-pandey.webp 2x"}}},"body":"function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nfunction _objectWithoutProperties(source, excluded) { if (source == null) return {}; var target = _objectWithoutPropertiesLoose(source, excluded); var key, i; if (Object.getOwnPropertySymbols) { var sourceSymbolKeys = Object.getOwnPropertySymbols(source); for (i = 0; i < sourceSymbolKeys.length; i++) { key = sourceSymbolKeys[i]; if (excluded.indexOf(key) >= 0) continue; if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue; target[key] = source[key]; } } return target; }\n\nfunction _objectWithoutPropertiesLoose(source, excluded) { if (source == null) return {}; var target = {}; var sourceKeys = Object.keys(source); var key, i; for (i = 0; i < sourceKeys.length; i++) { key = sourceKeys[i]; if (excluded.indexOf(key) >= 0) continue; target[key] = source[key]; } return target; }\n\n/* @jsxRuntime classic */\n\n/* @jsx mdx */\nvar _frontmatter = {\n  \"title\": \"Dockerize Java Application\",\n  \"category\": \"Programming\",\n  \"author\": \"Arvind Pandey\",\n  \"date\": \"2020-04-13T00:00:00.000Z\",\n  \"tags\": [\"#programming\", \"#devops\"],\n  \"thumbnail\": \"cover.jpg\"\n};\nvar layoutProps = {\n  _frontmatter: _frontmatter\n};\nvar MDXLayout = \"wrapper\";\nreturn function MDXContent(_ref) {\n  var components = _ref.components,\n      props = _objectWithoutProperties(_ref, [\"components\"]);\n\n  return mdx(MDXLayout, _extends({}, layoutProps, props, {\n    components: components,\n    mdxType: \"MDXLayout\"\n  }), mdx(\"h3\", {\n    \"id\": \"how-to-dockerize-the-java-application\"\n  }, \"How to dockerize the Java application\"), mdx(\"br\", null), mdx(\"h4\", {\n    \"id\": \"create-hello-world-program-in-java\"\n  }, \"Create Hello World Program in Java\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"class Hello {\\n    public static void main(String[] args) {\\n        System.out.println(\\\"Hello, it's great to be running inside docker image\\\");\\n    }\\n}\\n\")), mdx(\"h4\", {\n    \"id\": \"prepare-dockerfile-to-build-the-image\"\n  }, \"Prepare Dockerfile to build the image.\"), mdx(\"p\", null, \"Create Dockerfile without any extension and populate with below contents\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-yaml\"\n  }), \"FROM java:8\\nCOPY . /var/www/java\\nWORKDIR /var/www/java\\nRUN javac Hello.java\\nCMD [\\\"java\\\", \\\"Hello\\\"]\\n\")), mdx(\"h4\", {\n    \"id\": \"build-the-image-and-run-it\"\n  }, \"Build the image and run it.\"), mdx(\"p\", null, \"Run this command to build the image.\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"$ docker build -t java-app .\\n\")), mdx(\"p\", null, \"This command will build the image with the name \", mdx(\"strong\", {\n    parentName: \"p\"\n  }, \"java-app\")), mdx(\"h4\", {\n    \"id\": \"run-the-image\"\n  }, \"Run the image\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"$ docker run java-app\\n\")), mdx(\"p\", null, \"You should see the console output.\"), mdx(\"h4\", {\n    \"id\": \"using-docker-compose-to-build-the-image\"\n  }, \"Using docker-compose to build the image.\"), mdx(\"p\", null, \"Create a file with name docker-compose.yaml\\nUpdate its content to this.\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"version: '2'\\nservices:\\n  java:\\n    build: .\\n\")), mdx(\"p\", null, \"The build parameter informs about the location of Dockerfile. Here \", mdx(\"strong\", {\n    parentName: \"p\"\n  }, \".\"), \" signifies, it\\u2019s in the current directory.\"), mdx(\"h4\", {\n    \"id\": \"build-the-image\"\n  }, \"Build the image\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"docker-compose build\\n\")), mdx(\"h4\", {\n    \"id\": \"run-the-image-1\"\n  }, \"Run the image\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"docker-compose up\\n\")), mdx(\"p\", null, \"You should see the same console output again.\"), mdx(\"h4\", {\n    \"id\": \"introducing-environment-variables-in-docker-composeyaml\"\n  }, \"Introducing environment variables in docker-compose.yaml\"), mdx(\"p\", null, \"We can pass or set environment variables in docker-compose file. Update docker-compose.yaml file with one more detail.\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"version: '2'\\nservices:\\n  java:\\n    build: .\\n    environment:\\n    - ENV_TYPE = \\\"test\\\"\\n\")), mdx(\"p\", null, \"Now update the java code to read this environment variable.\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"class Hello {\\n    public static void main(String[] argss){\\n        System.out.println(\\\"Hello, it is nice to be running inside docker image\\\");\\n        if(System.getenv(\\\"ENV_TYPE\\\").equals(\\\"prod\\\")){\\n            System.out.println(\\\"Running on prod like env\\\");\\n        } else if (System.getenv(\\\"ENV_TYPE\\\").equals(\\\"test\\\")){\\n            System.out.println(\\\"Running on test like env\\\");\\n        } else {\\n            System.out.println(\\\"This is something other than prod or test\\\");\\n        }\\n    }\\n}\\n\")), mdx(\"p\", null, \"Build the image again and then run it.\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"$ docker-compose build\\n$ docker-compose up\\n\")), mdx(\"p\", null, \"The console should print the value set in the compose file.\"), mdx(\"h4\", {\n    \"id\": \"passing-the-environment-variable-from-outside\"\n  }, \"Passing the environment variable from outside\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {}), \"$ docker-compose run -e ENV_TYPE=test java\\n$ docker-compose run -e ENV_TYPE=prod java\\n$ docker-compose run -e ENV_TYPE=stag java\\n\")), mdx(\"p\", null, \"Now, you should see the console output depending upon the environment variable passed.\"));\n}\n;\nMDXContent.isMDXComponent = 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