Enable Partial Compilation in Intellij Idea

Enable Partial Compilation in IntelliJ IDEA

IntelliJ IDEA doesn't welcome working on the project that fails to compile, but there are several options:

• use Compile action from the file/folder context menu, disable Build in Run/Debug configuration.
• in the Before launch section of the Run/Debug configuration remove Build and add Build, no error check instead. Now start the configuration and it will ignore compilation errors trying to run on whatever classes managed to compile.
  

You should note that Make will fail on the first error and will not try to proceed further. In this case you should use explicit Compile action. Make also deletes output class files for the sources with errors.

If you want compilation to proceed after errors, you should switch to Eclipse compiler in IntelliJ IDEA Settings | Compiler | Java Compiler. When Eclipse compiler is selected, Proceed on errors option appears and it's enabled by default. With Eclipse compiler, an option to Proceed on errors enabled and Build, no error check in Before launch section you should get the desired behavior.

How to enable partial build in intellij (Gradle)?

You need to disable gradle build delegation for your compiler settings to have effect.

IntelliJ Idea, run code regardless of errors in unrelated project files

Modify your configuration to use Make, no error check option instead of Make.

For more information see this answer

Note that this may not be enough in your use case. Last resort is to use the solution provided by Vics answer.

Intellij IDEA Java classes not auto compiling on save

UPDATED

For IntelliJ IDEA 12+ releases we can build automatically the edited sources if we are using the external compiler option. The only thing needed is to check the option "Build project automatically", located under "Compiler" settings:

Also, if you would like to hot deploy, while the application is running or if you are using spring boot devtools you should enable the compiler.automake.allow.when.app.running from registry too. This will automatically compile your changes.

For versions greater than 2021.2, we need check 'Allow auto-make to start even id the development application is currently running' option:

For versions older than 2021.2:

Using Ctrl+Shift+A (or ⌘+Shift+A on Mac) type Registry once the registry windows is open, locate and enable compiler.automake.allow.when.app.running, see here:

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For versions older than 12, you can use the *EclipseMode* plugin to make IDEA automatically compile the saved files.

For more tips see the "Migrating From Eclipse to IntelliJ IDEA" guide.

Intellij Idea compiler recompiles already compiled project

You don't. IntelliJ IDEA has its own incremental compilation system which tracks the dependencies between files being compiled and recompiles the minimum set of classes for every set of changes. External compilation with tools like Maven or Gradle does not update IntelliJ IDEA's incremental compilation database. Because of that, IntelliJ IDEA cannot recognize the fact that classes have been already compiled with an external tool, and will recompile.

Intellij idea 2022.1.3 ultimate showing error java: JPS incremental annotation processing is disabled

I faced the same issue with intellij 2022 version. This issue occurs due to old lombok version like 1.16.16 or older. Update the lombok version to latest like 1.18.24. This version will resolve the error.

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.24</version>
    </dependency>

Intellij removes compiled java classes during run

If your main class has classes which were not compiled - it will not be compiled also. You need to recompile file by file or use Eclipse compiler. See this answer: https://stackoverflow.com/a/16784855/2000323 which basically duplicates your.

IntelliJ only runs code when every code in folder is compilable

It is not possible unless you break up your project into more modules and then compile/run only the current module, while reusing the built version of the other modules (that contain the errors right now).

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