Hotswap reloads every time IntelliJ is defocused

[jojule]

Description of the bug

Every time I change window focus from IntelliJ to anything else (for example the browser running my application), hotswap reload is triggered. Even if I have not made any changes.

For me it looks like this

HOTSWAP AGENT: 18:40:42.412 WARNING (org.hotswap.agent.watch.nio.WatcherNIO2) - Watcher on /Users/phoenix/Downloads/my-app/target/classes/com/example/application/services not valid, removing path=
HOTSWAP AGENT: 18:40:42.587 INFO (org.hotswap.agent.plugin.spring.reload.SpringBeanReload) - try to add changed property 'file:/Users/phoenix/Downloads/my-app/target/classes/application.properties' into org.springframework.beans.factory.support.DefaultListableBeanFactory@7048535f
HOTSWAP AGENT: 18:40:43.374 INFO (org.hotswap.agent.plugin.jackson.JacksonPlugin) - Reloaded Jackson.
HOTSWAP AGENT: 18:40:44.097 RELOAD (org.hotswap.agent.plugin.spring.reload.SpringBeanReload) - the properties of 'org.springframework.beans.factory.support.DefaultListableBeanFactory@7048535f' is changed
HOTSWAP AGENT: 18:40:44.103 ERROR (org.hotswap.agent.plugin.spring.reload.XmlsChangedCommand) - Error invoking method
java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:118)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.hotswap.agent.plugin.spring.reload.SpringChangedReloadCommand.executeCommand(SpringChangedReloadCommand.java:54)
	at org.hotswap.agent.command.impl.CommandExecutor.run(CommandExecutor.java:43)
}}${_p9k__e::=${${_p9k__1ldir+00}:-${${(%):-$_p9k__c%1(l.1.0)}[-1]}1}}}+}${${_p9k__e:#00}:+${${_p9k_t[$_p9k__n]/<_p9k__ss>/$_p9k__ss}/<_p9k__s>/$_p9k__s}${_p9k__v}${${(M)_p9k__e:#11}:+ }${_p9k__c}%b%K{234\}%F{031\} ${${:-${_p9k__s::=%F{234\}}${_p9k__ss::=%242F}${_p9k__sss::=%F{234\}}${_p9k__i::=2}${_p9k__bg::=234}}+}}${(e)_p9k__vcs}%b%k$_p9k__sss%b%k%f${:-" %b%k%f"}}}}+}${(e)_p9k_t[6]}${${_p9k__h::=95.5}+}${${_p9k__d::=$((_p9k__m-_p9k__h))}+}${_p9k__lprompt/\%\{d\%\}*\%\{d\%\}/${_p9k__1ldir-${:-"%B%F{039}"}${(Q)${:-"\\~"}}${:-"%b%K{234}%F{031}"}/${${${_p9k__d:#-*}:+Downloads}:-${:-"%F{103}"}Dow${:-"%b%K{234}%F{031}"}${$((_p9k__d+=6))+}}/${:-"%B%F{039}"}my-app${:-"%b%K{234}%F{031}"}}}${${_p9k__m::=$((_p9k__d+_p9k__h))}+}}${${COLUMNS::=$_p9k__clm}+}"
	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:180)
	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126)
	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239)
	at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210)
	at org.springframework.core.env.AbstractPropertyResolver.resolveNestedPlaceholders(AbstractPropertyResolver.java:230)
	at org.springframework.boot.context.properties.source.ConfigurationPropertySourcesPropertyResolver.getProperty(ConfigurationPropertySourcesPropertyResolver.java:80)
	at org.springframework.boot.context.properties.source.ConfigurationPropertySourcesPropertyResolver.getProperty(ConfigurationPropertySourcesPropertyResolver.java:61)
	at org.springframework.core.env.AbstractEnvironment.getProperty(AbstractEnvironment.java:552)
	at org.hotswap.agent.plugin.spring.files.PropertyReload.getPropertyOfPropertySource(PropertyReload.java:77)
	at org.hotswap.agent.plugin.spring.files.PropertyReload.reloadPropertySource(PropertyReload.java:60)
	at org.hotswap.agent.plugin.spring.reload.SpringBeanReload.refreshProperties(SpringBeanReload.java:385)
	at org.hotswap.agent.plugin.spring.reload.SpringBeanReload.doReload(SpringBeanReload.java:277)
	at org.hotswap.agent.plugin.spring.reload.SpringBeanReload.reload(SpringBeanReload.java:259)
	at org.hotswap.agent.plugin.spring.reload.SpringChangedAgent.doReload(SpringChangedAgent.java:204)
	at org.hotswap.agent.plugin.spring.reload.SpringChangedAgent.reloadAll(SpringChangedAgent.java:192)
	at org.hotswap.agent.plugin.spring.reload.SpringChangedAgent.reload(SpringChangedAgent.java:143)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	... 3 more

Expected behavior

If no files have been changed, there should not be reload.

Minimal reproducible example

Minimal Hello World application from start.vaadin.com with two views: One for Hilla and for Flow

Versions

Hilla: 24.5.0.alpha15
Flow: 24.5.0.alpha20
Vaadin: 24.5.0.alpha17
Copilot: 24.5.0.alpha20
Frontend Hotswap: Enabled, using Vite
OS: aarch64 Mac OS X 15.0
Java: JetBrains s.r.o. 21.0.3
Browser: Chrome 128.0.6613.138 (Official Build) (arm64)
Java Hotswap: false
IDE Plugin: 1.3.1
IDE: IntelliJ 2024.2

[Artur-]

Does it help if you remove this from the launch configuration?

[mcollovati]

Looking at the logs, it appears that there's something that modifies the application.properties file, triggering Spring reload.

EDIT: it happens, for example, if you touch the application.properties in target/classes folder.

[mcollovati]

Or any other properties file, according to the filter in the Spring plugin

@OnResourceFileEvent(path = "/", filter = ".*.properties", events = {FileEvent.MODIFY})

[Artur-]

This specific problem related to moving focus from IntelliJ to the browser should be resolved by turning off the frame deactivation policy, which will be done automatically with vaadin/intellij-plugin#87

[Artur-]

There is another problem described here also, which is why your application.properties keep changing. Without that, you would only see "Loaded classes are up to date. Nothing to reload." when moving to the browser window