Spring Boot v2.2.7 Memory Leak

Description

After upgrade from Spring Boot 2.2.6 to 2.2.7 application started consuming much more memory. In particular Heap Dump shows significantly higher number of instances of type: org.springframework.boot.loader.jar.JarFile.

Heap Dump (v2.2.6) is here. It contains the following number of instances:

Heap Dump (v2.2.7) is here. It contains the following number of instances:

The number of instances is significantly higher.

Reason

After checking the history of related changes there is a couple of commits that worth to be checked:

Create new JarFile instance for URL connections

Attempt to prevent JarFiles from being left open

Attempt to prevent JarFiles from being left open

Steps to reproduce

Checkout current repository and perform the following steps:

$ ./mvnw clean package
$ cd target
$ java -jar spring-boot-2.2.7.RELEASE-memory-leak.jar

Now memory profiler can be attached.

After, adjust the version of the parent (spring-boot-starter-parent) in POM to 2.2.6.RELEASE and perform the following steps:

$ ./mvnw clean package
$ cd target
$ java -jar spring-boot-2.2.6.RELEASE-memory-leak.jar

Now memory profiler can be attached again.