Breakpoint at "throw new SilentExitException()" in Eclipse + Spring Boot

Question

Every time I run my Spring Boot project on debug mode in Eclipse IDE (Spring Tool Suite), the thread stops at throw new SilentExitException(); line even without a breakpoint.

Is there some solution to avoid this behavior?

org.springframework.boot.devtools.restart.SilentExitExceptionHandler.exitCurrentThread() (line 53):

public static void exitCurrentThread() {
    throw new SilentExitException();
}

This starts happening after upgrade to 1.3.0 Milestones.

Spring Tool Suite

Version: 3.7.0.RELEASE
Build Id: 201506290649

Platform:

Eclipse Luna SR2 (4.4.2)

Solution 1

This is unfortunately a know issue with the new spring-boot-devtools module (see https://github.com/spring-projects/spring-boot/issues/3100). We use this trick to kill the main thread so that we can replace it with a re-loadable version. So far I've not found a way to prevent the debug breakpoint from triggering.

For now, you can toggle the "suspend execution on uncaught exceptions" checkbox in Java -> Debug preferences to prevent it from happening.

Solution 2

Add the property as a VM argument:

-Dspring.devtools.restart.enabled=false

That way you don't have to change your code, as it is the case when using:

System.setProperty("spring.devtools.restart.enabled", "false");

Solution 3

As Eclipse on Debug mode already allows limited hotpatching, I find the reloader to be counterproductive most of the time and so I decided to disable it by:

System.setProperty("spring.devtools.restart.enabled", "false");

Reference: https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-devtools.html#using-boot-devtools-restart-disable

Since that exception is thrown by the reloader, this also solves this issue. Note that you'll have to use the System.setProperty method instead of setting it in application.properties.

Solution 4

My workaround:

public static void main(String[] args) {
    try {
        SpringApplication.run(App.class, args);
    } catch (Throwable e) {
        if(e.getClass().getName().contains("SilentExitException")) {
            LOGGER.debug("Spring is restarting the main thread - See spring-boot-devtools");
        } else {
            LOGGER.error("Application crashed!", e);
        }
    }
}

It doesn't matter that we ignore the SilentExitException because the devtools are just restarting the instance with a SilentExitException which isn't very silent. This try block will silence it...

I had to use text matching on the class as the SilentExitException is private in SilentExitExceptionHandler.

It doesn't solve your problem with the breakpoint...

Solution 5

Delete these to Unknown Exceptions & it won't break there:

Unfortunately, I haven't found a way for this to be permanent, but it should last till the next time you restart eclipse.

View more solutions

Comments

[Stefan Falk]

This issue is still present unfortunately.

[nabster]

This issue is still present.

[Sachin Sharma]

still present :p

[sivakadi]

Out of other options, I used this. Thanks a lot for making my day!

[src3369]

This issue still present. using Eclipse Version: 2019-06 (4.12.0) & spring-boot 2.0.6. Window-> Preferences -.> Java -> Debig -> unchecked "Suspend execution on uncaught exceptions"

[HDJEMAI]

Still present with Eclipse version 2020-03 (4.15.0) & spring-boot 2.3.1

[Shramik]

Still present on spring boot 2.4.0 and eclipse Version: 2020-06 (4.16.0)

[MBach]

Well, you know, still present

[Abhilash]

Worked for me! Thanks :)

[ScrappyDev]

Setting the scope to runtime, didn't work for me.

[borgmater]

And all of a sudden, it became present for me too ..

[Ivan Rodrigues]

Thank u for share!!! I used in the main method with: System.setProperty("spring.devtools.restart.enabled", "false");

[Voronin]

Spring Boot 2.7.1 and the issue is still present....