{"id":603,"date":"2020-08-05T08:13:20","date_gmt":"2020-08-05T08:13:20","guid":{"rendered":"https:\/\/www.javaindia.in\/blog\/?p=603"},"modified":"2020-08-05T08:13:20","modified_gmt":"2020-08-05T08:13:20","slug":"role-of-jpms-in-the-java-web-application-development","status":"publish","type":"post","link":"https:\/\/www.javaindia.in\/blog\/role-of-jpms-in-the-java-web-application-development\/","title":{"rendered":"What is the role of JPMS in the Java Web Application Development?"},"content":{"rendered":"

JPMS has brought a complete change to the Java libraries, language, and runtime. This overall means that it affects the complete stack that developers code on a regular basis and with JPMS could have a big impact. The key concept to know here is that JPMS adds a new concept to the JVM modules. Earlier the code was managed into fields, methods, classes, interfaces and packages. But with Java SE 9 there is a new concept named modules.
\n<\/span>
\n\u2022 Class is a container of fields and methods<\/span>
\n\u2022 Package is a container of classes and interfaces<\/span>
\n\u2022 Module is a container of packages<\/span>
\n
\nSince it is a new JVM element, the runtime can implement strong access control. With Java 8, a major challenge for Java Development Company <\/a>was a class that cannot be seen by other classes when declared private. With Java 9, a developer can hide a package within a module.<\/span>
\n
\nWhat is a Module?<\/strong><\/span>
\nModularity offers a higher level of aggregation. This new language element has a unique name, reusable group of related packages, resources like images, and XML files. A module descriptor specifies the following:
\n<\/span>
\n\u2022 name<\/span>
\n\u2022 dependencies (that is, other modules this module depends on)<\/span>
\n\u2022 packages it explicitly makes available to other modules<\/span>
\n\u2022 services it offers<\/span>
\n\u2022 services it consumes<\/span>
\n
\nWhy Java needs modules?<\/strong><\/span>
\nJPMS is the result of the project Jigsaw, which was started with the following objectives:<\/span>
\n\u2022 Make it simpler for the developers to manage large apps and libraries<\/span>
\n\u2022 Enhance the structure and security of the platform<\/span>
\n\u2022 Improve overall app performance<\/span>
\n\u2022 Handle breakdown of the platform for smaller gadgets<\/span>
\n
\nIt\u2019s important to note here that the JPMS is a SE feature, and affects every aspect of Enterprise application in Java<\/a> from the starting stage. The change is properly designed to ensure most code to perform without modification when switching from Java 8 to Java 9.<\/span>
\n
\nHow to Build a Modular Java Project?<\/strong><\/span>
\nTo build a module following listings mentioned below are need to be added:<\/span>
\n
\nListing 1: com.javaworld.mod1\/module-info.java<\/strong><\/span><\/p>\n

module com.javaworld.mod1 {\r\n  exports com.javaworld.package1;\r\n}<\/span><\/span><\/pre>\n
Here the module and the package it exports have different names. We are defining a module that simply exports a package.<\/span>
\n
\nListing 2: Name.java<\/strong><\/span><\/p>\n
package com.javaworld.package1;\r\npublic class Name {\r\n public String getIt() {\r\n  return \"Java World\";\r\n }\r\n}<\/span><\/span><\/pre>\n
It will become a class, package, and module upon which development of web application depend.<\/span>
\n
\nListing 3: com.javaworld.mod2\/module-info.java<\/strong><\/span><\/p>\n
module com.javaworld.mod2 {\r\n requires com.javaworld.mod1;\r\n}<\/span><\/span><\/pre>\n
This listing is pretty self-explanatory. It defines com.javaworld.mod2 module and requires com.javaworld.mod1.<\/span>
\n
\nListing 4: Hello.java<\/strong><\/span><\/p>\n
package com.javaworld.package2;\r\nimport com.javaworld.package1.Name;\r\npublic class Hello {\r\n public static void main(String[] args) {\r\n  Name name = new Name();\r\n  System.out.println(\"Hello \" + name.getIt());\r\n }\r\n}<\/span><\/span><\/pre>\n
Here, we start by defining the package, then importing the com.javawolrd.package1.Name class. Remember that these elements function the way they always do. The modules have changed how the packages are made available at the file structure level, not the code level.<\/span>
\n
\nFrequently Asked Questions
\n\"frequently
\n<\/strong><\/span>
\n1. What is the use of a module in Java?<\/strong><\/span>
\nA Java Module is a mechanism to package up your Java application and Java packages into Java modules. A Java module can specify which of the Java packages it contains that should be visible to other Java modules using this module. A Java module must also specify which other Java module is required to do its job.<\/span>
\n
\n2. How do I use Java 9 modules?<\/strong><\/span>
\nJava 9 Module \u2013 Create and use modules in Eclipse IDE<\/span>
\n\u2022 Creating a Java Project. We are creating a java project in Eclipse IDE.<\/span>
\n\u2022 Create a module-info.<\/span>
\n\u2022 Create a package and a class.<\/span>
\n\u2022 Export the package that we have created.<\/span>
\n\u2022 Let’s create another module.<\/span>
\n\u2022 Let’s create a class in the second module.<\/span>
\n\u2022 Final Step.<\/span>
\n
\n3. How do modules work?<\/strong><\/span>
\nModules are used to organize content in an organized manner. Modules essentially create a one-directional linear flow of what application should do. Each module can contain files, packages in an engaged manner.<\/span>
\n
\n4. What is abstraction in Java?
\n<\/strong><\/span>Data abstraction is the process of hiding certain details and showing only essential information to the user. Abstraction can be achieved with either abstract classes or interfaces.<\/span>
\n
\n5. What is the use of Eclipse IDE?<\/strong><\/span>
\nIn the context of computing, Eclipse is an integrated development environment (IDE) for developing applications using the Java programming language and other programming languages such as C\/C++, Python, PERL, Ruby etc.<\/span>
\n
\nWrapping Up:<\/strong><\/span>
\nJPMS is a remarkable sweeping change and it will take time to implement. You don\u2019t have to rush, since old versions of Java have a long-term support release. But, in the long run, older projects will need to hire Java developers<\/a> to migrate, and new ones will require using modules intelligently, hopefully capitalizing on some of the major benefits. Make sure you avail expertise from a reputed development agency having years of expertise in the Java web application development. This requires investment but will bring remarkable results for your business.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
JPMS has brought a complete change to the Java libraries, language, and runtime. This overall means that it affects the complete stack that developers code on a regular basis and with JPMS could have a big impact. The key concept to know here is that JPMS adds a new concept to the JVM modules. Earlier the code was managed into […]<\/p>\n","protected":false},"author":1,"featured_media":605,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[50],"tags":[51],"class_list":["post-603","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-jpms","tag-jpms"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/posts\/603","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/comments?post=603"}],"version-history":[{"count":6,"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/posts\/603\/revisions"}],"predecessor-version":[{"id":610,"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/posts\/603\/revisions\/610"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/media\/605"}],"wp:attachment":[{"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/media?parent=603"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/categories?post=603"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.javaindia.in\/blog\/wp-json\/wp\/v2\/tags?post=603"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}