Compile and build applications with IntelliJ IDEA |
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Compile and build applications with IntelliJ IDEA The IntelliJ IDEA compilation and building process compiles source files and brings together external libraries, properties files, and configurations to produce a living application. IntelliJ IDEA uses a compiler that works according to the Java specification. You can compile a single file, use the incremental build for a module or a project, and rebuild a project from scratch. If you have a pure Java or a Kotlin project we recommend that you use IntelliJ IDEA to build your project since IntelliJ IDEA supports the incremental build which significantly speeds up the building process. However, IntelliJ IDEA native builder might not correctly build the Gradle or Maven project if its build script file uses custom plugins or tasks. In this case, the build delegation to Gradle or Maven can help you build your project correctly. Compile a single file or classOpen the needed file in the editor and go to Build | Recompile 'class name' (Ctrl+Shift+F9) in the main menu. Alternatively, in the Project tool window, right-click the class you need and from the context menu, select Recompile 'class name'. If errors occur during the compilation process, IntelliJ IDEA will display them in the Review compilation and build output along with warning messages. Change the compilation output locationsWhen you compile your source code, IntelliJ IDEA automatically creates an output directory that contains compiled .class files. ![]() Inside the output directory, IntelliJ IDEA also creates subdirectories for each of your modules. The default paths for subdirectories are as follows: Sources: /out/production/ Tests: /out/test/ At the project level, you can change the /out part of the output path. If you do so (say, specify some instead of /out) but don't redefine the paths at the module level, the compilation results will go to /production/ and /test/. At the module level, you can specify any desirable compilation output location for the module sources and tests individually. Specify compilation output foldersOpen the Project Structure dialog (File | Project Structure Ctrl+Alt+Shift+S). In Project Settings, select Project and in the Project compiler output field, specify the corresponding path. ![]() For modules, select Modules, the module you need and the Paths tab. Change the location of the output folder under the Compiler output section. ![]() When you execute the Build When you change any class inside the build target and then execute the build action, IntelliJ IDEA performs the incremental build that compiles only the changed classes. IntelliJ IDEA also recursively builds the classes' dependencies. Build a module, or a projectSelect a module or a project you want to compile and go to Build | Build Project (Ctrl+F9). IntelliJ IDEA displays the compilation results in the Review compilation and build output. If you add a module dependency to your primary module and build the module, IntelliJ IDEA builds the dependent module as well and displays it in the output directory alongside the primary one. If the dependent module has its own module dependencies, then IntelliJ IDEA compiles all of them recursively starting with the least dependent module. ![]() The way the module dependencies are ordered may be very important for the compilation to succeed. If any two JAR files contain classes with the same name, the IntelliJ IDEA compiler will use the classes from the first JAR file it locates in the classpath. For more information, refer to Module dependencies. RebuildWhen you execute a rebuild command, IntelliJ IDEA cleans out the entire output directory, deletes the build caches and builds a project, or a module from scratch. It might be helpful when the classpath entries have changed. For example, SDKs or libraries that the project uses are added, removed or altered. Rebuild a module, or a projectIn the main menu, go to Build | Rebuild Project for the entire project or Build | Rebuild 'module name' for the module rebuild. IntelliJ IDEA displays the build results in the Review compilation and build output. When the Rebuild Project action is delegated to Gradle or Maven, IntelliJ IDEA doesn't include the clean task/goal when rebuilding a project. If you need, you can execute the clean command before the rebuild using the Execute Before Rebuild option in the Gradle or Maven tool window. Background compilation (auto-build)You can configure IntelliJ IDEA to build your project automatically, every time you make changes to it. The results of the background compilation are displayed in the Problems tool window. Configure the background compilationPress Ctrl+Alt+S to open settings and then select Build, Execution, Deployment | Compiler. On the Compiler page, select Build project automatically. Now when you make changes in the class files, IntelliJ IDEA automatically performs the incremental build of the project. The automatic build also gets triggered when you save the file (Ctrl+S) or when you have the Save files automatically if application is idle for N sec. option selected in the System settings dialog. Enabling the Build project automatically option also enables Build project in Settings | Tools | Actions on Save When you have the Power Save Mode option (File | Power Save Mode) enabled in your project, the auto-build action is disabled, and you need to manually run the build (Ctrl+F9). Compile before runningBy default, when you run an application, IntelliJ IDEA compiles the module in which the classes you are trying to run are located. If you want to change that behavior, you can do so in the Run/Debug Configurations dialog. Configure a run/debug configurationIn the main menu, go to Run | Edit Configurations. In the dialog that opens, create a new or open an existing run configuration. Click the Modify options link. In the Add Run Options list, under the Before Launch section, select Add before launch task. The list of tasks becomes available and the Build will be selected. Click ![]() If you need to add a new configuration action, click For example, if you select Build Project then IntelliJ IDEA will build the whole project before the run. In this case, the dependencies that were not included in the build with the Build action, will be accounted for. If you select the Build, no error check option, IntelliJ IDEA will run the application even if there are errors in the compilation results. ![]() IntelliJ IDEA reports compilation and building results in the Build tool window, which displays messages about errors and warnings as well as successful steps of compilation. ![]() If you configured an auto-build, then IntelliJ IDEA uses the Problems tool window for messages. The window is available even if the build was executed successfully. To open it, click Auto-build on the status bar. ![]() Double-click a message to jump to the problem in the source code. If you need to adjust the compiler settings, click When the code is compiled and ready, you can package your application in a Java archive (JAR) to share it with other developers. A built Java archive is called an artifact. Create an artifact configuration for the JARIn the main menu, go to File | Project Structure Ctrl+Alt+Shift+S and click Artifacts. Click To the right of the Main Class field, click IntelliJ IDEA creates the artifact configuration and shows its settings in the right-hand part of the Project Structure dialog. Apply the changes and close the dialog. ![]() In the main menu, go to Build | Build Artifacts. Point to the created .jar (HelloWorld:jar) and select Build. If you now look at the out/artifacts folder, you'll find your .jar file there. ![]() When you're building a project, resources stored in the Resources root are copied into the compilation output folder by default. If necessary, you can specify another directory within the output folder to place resources. Add other files to a JAR artifactYou can add other files to a JAR artifact. For example, you can add some image files, configuration files, and JAR files. Add a file to a JAR artifactIn the main menu, go to File | Project Structure Ctrl+Alt+Shift+S and click Artifacts. Under Output Layout, click From the context menu, select File. In the dialog that opens, locate the file, add it and click OK. In the main menu, go to Build | Build Artifacts. Point to the created .jar and select Build. The built JAR artifact includes the added files. Run a packaged JARTo run a Java application packaged in a JAR, IntelliJ IDEA allows you to create a dedicated run configuration. If you have a Gradle project, use Gradle to create and run the JAR file. For Maven projects, you can use IntelliJ IDEA to run a JAR file. If you have a Spring Boot Maven project, refer to the Spring section. Create a run configurationPress Ctrl+Shift+A, find and run the Edit Configurations action. In the Run/Debug Configurations dialog, click Add a name for the new configuration. ![]() In the Path to JAR field, click Under Before launch, click Doing this means that the JAR is built automatically every time you execute the run configuration. Run configurations allow you to define how you want to run your application, with which arguments and options. You can have multiple run configurations for the same application, each with its own settings. Execute the run configurationOn the toolbar, select the created configuration and click As before, the Run tool window opens and shows you the application output. ![]() If the process has exited successfully, then the application is packaged correctly. Last modified: 28 June 2024EncodingBuild tools |
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