"jar:file:/users/dk/spring-boot-loader-play/build/libs/spring-boot-loader-play-0.0.1-snapshot.jar!/boot-inf/lib/spring-boot-autoconfigure-2.0.0.m7.jar!/" "jar:file:/users/dk/spring-boot-loader-play/build/libs/spring-boot-loader-play-0.0.1-snapshot.jar!/boot-inf/lib/spring-boot-starter-2.0.0.m7.jar!/"
#VOID LAUNCHER JAR ARCHIVE#
So how are the urls are provided to launchedurlclassloader? the jar archive is parsed from top to bottom, and when an archive is found, it’s added to the url list. when classloading, all of the resources specified by urls will be traversed in the order the urls were provided, and the first resource containing the searched class will be used. the url might point to a location like a jar archive or classes folder. , which is created with a set of urls that will be used for classloading.
launchedurlclassloaderĬontent, but the loader seems not the have that preference. ) are handled by the same classloader, which, in turn, resides in the root of the jar ( So actually, it contains three types of entries: | +- spring-boot-2.0.0.m7.jar # original banner class inside | | | \- springbootbanner.class # this is our fix +- spring-boot-loader-play-0.0.1-snapshot.jar Great! but the joy is premature… if you build the app and run it: Now let’s run the app from the ide and everything seems to work: So what can we do to have the solution work immediately? let’s just take the class (with the package) and paste it into our project ( I know we can easily define custom banners in spring boot, it’s just a useful example - it will be super easy to spot if the ‘fix’ is working or not is using a library snapshot the only way? wouldn’t it be great if there was a solution to temporarily override only a few particular classes?Ĭlass and already have a solution to fix the banner’s colors. the pull request was merged, but the fix is critical for you and you can’t wait till next library release. as a good scout, you fixed it and created a pull request with a solution. Let’s say you found a bug in some third-party jar your app uses. ) and a way to temporarily override library classes with your custom ones.
This article explains the spring boot classloader (
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