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. Published at DZone with permission of Nicolas Frankel. Migrating a Spring Boot App to Java 9 (Part 2): Modules In part 1, we saw the compatibility issues of migrating a Spring Boot app to Java 9. Spring Boot project using Java 9 modules – part 2 – adding Spring Data JPA. Spring Boot project using Java 9 modules – part 1. It’s not a module since there’s no module-info in the JAR. The IDE tells exactly what class it cannot read and a wizard lets you put it in the module file. In addition, I’ve excluded jsonassert, because it contains the package org.json. Last, but not least, the testing part. The same package is defined by the android.json jar, and this leads to a split package issue. Each maven module will also be a names Java module. At this point, explicitly declaring the main class resolves the issue. 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. Objective. It’s important because in this version they added support to compile module-info.java files found in /test sources. Javassist is the culprit here. Since the first part of this post, I’ve been made aware that Spring Boot 1.5 won’t be made Java 9-compatible. 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. We did it! Last week, I tried to make a Spring Boot app - the famous Pet Clinic, Java 9 compatible. As far as the opens statement goes, one option is to mark the whole module with ‘open’. Join the DZone community and get the full member experience. 12/06/2020 ~ Vlad Carcu. Migrating to Java 9 requires using Jigsaw whether you like it or not. Migrating to Java 9 requires using Jigsaw, whether you like it or not. To fix it, exclude the dependency, and add the latest version: Fortunately, versions are compatible - at least for our usage. While it’s interesting for library/framework developers to add an additional layer of access control to their internal APIs, it’s much less so for application ones. I hope to conduct this experiment again in some months and to notice an improvement in the situation. I had to let go of a lot of features along the way. Don’t shoot yourself in the foot trying to get Spring Boot running on the Java 9 module path. See the original article here. It might be a bit much, but it’s ok for now. I’m fortunate to benefit from an IntelliJ IDEA license. This week, I want to continue the migration by fully embracing the Java 9 module system. 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. Before Java 9 module, Java programs are packages. Notice the maven-compiler-plugin version, which is 3.8.0. 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). I’m fortunate to benefit from an IntelliJ IDEA license. Let’s do it. The rest module contains a controller and a Spring Boot test, which simply loads the context. While it’s interesting for library/framework developers to add an additional layer of access control to their internal APIs, it’s much less so for application ones. This post aims to correct that by providing a step-to-step migration guide for a non-trivial modern Spring Boot application. It created various modules to organize the contents. Marketing Blog. At this point, explicitly declaring the main class resolves the issue. These missing dependencies are either visible at compile time (e.g. It was not easy. Currently working for Hazelcast. ( Log Out /  Bumping Spring Boot to 2.0.0.M5 requires some changes in the module dependencies: This issue has already been documented. 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 required modules, Migrating a Spring Boot App to Java 9 (Part 2): Modules, Developer Now we dig into how to do it with Project Jigsaw's modules. 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 endpoints will be secured using Spring Security with OAuth. Key Points Of Spring boot java 9 examples: Make sure that Java 9 properly install in your computer, To check java 9 version using the following command. having two Java modules which depend on each other, ensuring tests are correctly run as part of the build process. And only after that the module game begins :). In part 1 I set up a Spring Web application with an endpoint returning a hard coded value. In the pom.xml, we have a pretty basic configuration. This approach is prone to bugs, because it relies on having two files synchronized by hand, but for smaller projects it’s ok. I aim to build a sample multi-module maven project with Spring Boot. I aim to build a sample multi-module maven project with Spring Boot. The most straightforward way is to use the setContent() method on the UI. I’ll probably also experiment with ‘opens package to’, to understand whether it’s feasible to maintain long-term. Since the first part of this post, I’ve been made aware that Spring Boot 1.5 won’t be made Java 9-compatible. This is it for now.

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