In order to support Java 22, we must use spring-core 6.1.x.
spring-core 6.1.x is a multi-release jar so, in order to support Java
22, a version of Gradle that supports multi-release jars must be
used.
This commit adds a new variant to spring-boot-gradle-plugin for
modern versions of Gradle. When Gradle's plugin API version is 8.7 or
later, we use spring-core 6.1.x. spring-core 6.0.x is used at all
other times.
Closes gh-40074
Fix regression in `JarUrlConnection` where a NullPointerException could
be thrown internally causing performance issues.
When the SecurityManager is present, the following stack trace is
thrown:
java.lang.NullPointerException: Cannot invoke "java.net.URLConnection.getPermission()" because "this.jarFileConnection" is null
at org.springframework.boot.loader.net.protocol.jar.JarUrlConnection.getPermission(JarUrlConnection.java:175)
at java.base/jdk.internal.loader.URLClassPath.check(URLClassPath.java:553)
at java.base/jdk.internal.loader.URLClassPath$Loader.findResource(URLClassPath.java:612)
at java.base/jdk.internal.loader.URLClassPath.findResource(URLClassPath.java:296)
at java.base/java.net.URLClassLoader$2.run(URLClassLoader.java:629)
at java.base/java.net.URLClassLoader$2.run(URLClassLoader.java:627)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.net.URLClassLoader.findResource(URLClassLoader.java:626)
at org.springframework.boot.loader.net.protocol.jar.JarUrlClassLoader.findResource(JarUrlClassLoader.java:70)
at java.base/java.lang.ClassLoader.getResource(ClassLoader.java:1403)
at java.base/java.net.URLClassLoader.getResourceAsStream(URLClassLoader.java:290)
at java.base/java.lang.Class.getResourceAsStream(Class.java:2850)
See gh-39856
The diagnostics text include the name of the AOT initializer class and
the main class name. It also tells the user how to switch of the AOT
mode.
Closes gh-38645
