This is the second installment in the series, and it builds on top of the previously developed code. what I do, how I do it, and why I'm wasting my time with it…. The IDE tells exactly what class it cannot read and a wizard lets you put it in the module file. Change ), You are commenting using your Facebook account. It was not easy. The rest module contains a controller and a Spring Boot test, which simply loads the context. The sample app chosen to do that is the Spring Pet clinic. As far as the opens statement goes, one option is to mark the whole module with ‘open’. In the end, it looks like this: Note that module configuration in the maven-compiler-plugin and maven-surefire-plugin can be removed. Before Java 9 module, Java programs are packages. Developer Advocate with 15+ years experience consulting for many different customers, in a wide range of contexts (such as telecoms, banking, insurances, large retail and public sector). If you happen to be in a less-than-ideal environment, the process is the following: javax.cache is located in the cache-api-1.0.0.jar. Bumping Spring Boot to 2.0.0.M5 requires some changes in the module dependencies: This issue has already been documented. Last week, I tried to make a Spring Boot app - the famous Pet Clinic, Java 9 compatible. com.fasterxml.jackson.core). The module-info.java for this module looks like this: I had to add java.sql because, on failing to run, an SQLException was thrown, and that caused a ClassNotFoundException. This week, I want to continue the migration by fully embracing the Java 9 module system. Migrating to Java 9 requires using Jigsaw, whether you like it or not. The module-info.java for the rest module looks like this: Adding the requires and the opens was a bit of trial and error. 12/06/2020 ~ Vlad Carcu. And all in all, the only benefit I got was improvement of String memory management. Usually working on Java/Java EE and Spring technologies, but with focused interests like Rich Internet Applications, Testing, CI/CD and DevOps. It was not easy. Change ), You are commenting using your Google account. The first step is to create such a file at the root of the source directory, with the module name: The rest of the journey can be heaven or hell. The dependency is required Spring Data JPA, transitively via Hibernate. To fix it, exclude the dependency and add the latest version: Fortunately, versions are compatible — at least for our usage. Icing on the cake, the Dev Tools dependency can be re-added. Diving into the modules, the domain module only uses so far the spring-boot-starter module. I hope to conduct this experiment again in some months and to notice an improvement in the situation. It’s important because in this version they added support to compile module-info.java files found in /test sources. In the future, I’ll try to look at how this process can be improved using tools. The back-end will connect to a relational database (configuration will be provided for PostgreSQL). Promising candidates for now are: pro (Java 9 compatible build tool) and jdeps (java dependency analysis tool). Don’t shoot yourself in the foot trying to get Spring Boot running on the Java 9 module path. ( Log Out /  Unfortunately, just adding module-info.java to the root of sources is not enough to say that now you have Java 9 modular application. Published at DZone with permission of Nicolas Frankel. At this stage, it’s not worth it to move to Java 9. In Java we have classes, packages and now modules, too. This will enable deep reflection into all the packages of your module. Unfortunately, most of the articles written focus on simple Hello world applications. At this point, explicitly declaring the main class resolves the issue. At the very least, it means a painful trial and error search-for-the-next-fix process and removing important steps in the build process. Create a free website or blog at WordPress.com. As we know that in Java, a package can access only public methods of another packages. The first step is to create such a file at the root of the source directory, with the module name: The rest of the journey can be heaven or hell. The same package is defined by the android.json jar, and this leads to a split package issue. Rinse and repeat. And only after that the module game begins :). Or worse, regarding Spring applications, the sample app uses legacy practices - like XML for example. When Java 9 was created, the JDK went under a major refactoring to modularize its content. At this stage, it’s not worth to move to Java 9. I’ll probably also experiment with ‘opens package to’, to understand whether it’s feasible to maintain long-term. You also need to put your Java 9 module to module path. Notice the maven-compiler-plugin version, which is 3.8.0. This is it for now. Now we dig into how to do it with Project Jigsaw's modules. Bumping Spring Boot to 2.0.0.M5 requires some changes in the module dependencies: This issue has already been documented. The endpoints will be secured using Spring Security with OAuth. This week, I want to continue the migration by fully embracing the Java 9 module system. Spring Boot project using Java 9 modules – part 2 – adding Spring Data JPA. These missing dependencies are either visible at compile time (e.g. ( Log Out /  Join the DZone community and get the full member experience. I’m fortunate to benefit from an IntelliJ IDEA license. Given that the setup so far is extremely simplified, I’ve opted to use the more specific ‘opens’ instead. Since the first part of this post, I’ve been made aware that Spring Boot 1.5 won’t be made Java 9-compatible. It created various modules to organize the contents. We have created a modules maven project, with two modules, domain and rest. The app is now ready to be tested with mvn clean spring-boot:run. Javassist is the culprit here. Objective. At this point, explicitly declaring the main class resolves the issue. In this first part, I’ll be demonstrating the following concepts: The full code commit for this part can be found here: https://github.com/vladcd/spring-boot-modules/commit/cc93a058b28c807bc63aef9ce6f9bc87d0c7ecb4. We did it! Migrating a Spring Boot application to Java 9 - Modules, Analyze the error in the log to get the offending package, If the JAR is a module, add the module name to the list of required modules, If not, compute the automatic module name, and add it to the list of requires modules, Migrating a Spring Boot application to Java 9 - Compatibility. The most widespread way is to use the navigator. Last, but not least, the testing part. Let's handle that. See the original article here. This post aims to correct that by providing a step-to-step migration guide for a non-trivial modern Spring Boot application. Check java -version; Check javac -version; Make sure that IDE that you are using supporting java 9 version; Java 9 is properly configured with IDE; Project Structure If you happen to be in a less than ideal environment, the process is the following: javax.cache is located in the cache-api-1.0.0.jar. The solution, in this case, was to give up on one of the dependencies, and considering jsonassert depends on android.json, the latter couldn’t be removed. The endpoints will be secured using Spring Security with OAuth. Under test/java, I’ve added a file called module-info.test. Opinions expressed by DZone contributors are their own. I had to let go of a lot of features along the way. spring-boot-starter-web and domain are standard for the setup. In addition, I’ve excluded jsonassert, because it contains the package org.json. It’s not a module since there’s no module-info in the JAR. I aim to build a sample multi-module maven project with Spring Boot. ( Log Out /  The IDE tells exactly what class it cannot read and a wizard lets you put it in the module file. When the maven-compiler-plugin will run, it will replace the module-info.java from the src/main folder with the module-info.test from the src/test folder. Each maven module will also be a names Java module. I aim to build a sample multi-module maven project with Spring Boot. Also double as a trainer and triples as a book author. Module information in Java 9 is implemented through a module-info.java file. Each maven module will also be a names Java module.

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