How to enable Intellij hot code swap

user_48062 0
Viewed 123125

Intellij does not seem to be doing basic hot code swap on my installation.

For this code:

public class MainTest {
    public void method1() {
        System.out.println("Breakpoint here");
    }

    public void method2() {
        System.out.println("Line that will get 24 modified");
    }

    public static void main(String[] args) {
        System.out.println("First print here");
        MainTest mainTest = new MainTest();
        mainTest.method1();
        mainTest.method2();
        System.out.println("Line that I do not modify");
    }
}

I put a breakpoint on mainTest.method1(); then modify the string at method2(), hit ctrl+s and continue to step by step. Unfortunately the runtime is not updated, old string is being printed. Full stop - compile - run does print the new string. So my conclusion is hot-swap not working.

Is there any settings I need to set to enable hot code swap?

  • Ubuntu, JDK 1.6
  • Intellij 10.5 Ultimate (evaluation)
hotswap intellij-idea
8 Answers

I wanted hotswap to automatically run every time I saved a Java file. None of the other answers did this so I just:

  1. Created a macro that will run on save: https://stackoverflow.com/a/5581992/14731
  2. Added Action: Hotswap at the end of the macro (Run -> Reload Changed Classes)
Gili_147310

I think you are asking about this,

  1. Right-click on your java class
  2. Select Compile And Reload File
user_26790330
user_51221350

I encountered this problem on Ubuntu. I also had an apparently unrelated issue where IntelliJ gave an error about the file watch limit (my apologies that I no longer have the exact error message). To solve this later issue I did the following steps:

  1. Add the following line to either /etc/sysctl.conf file or a new *.conf file (e.g. idea.conf) under /etc/sysctl.d/ directory:

    fs.inotify.max_user_watches = 524288

  2. Then run this command to apply the change:

    sudo sysctl -p --system

Now my React components rebuild and hot swap just fine.

Source

user_14405650
Related