Rewrite nested jar code to better align with the implementations
provided in Java 17. This update makes two fundamental changes to
the previous implementation:
- Resource cleanup is now handled using the `java.lang.ref.Cleaner`
- Jar URLs now use the form `jar:nested:/my.jar/!nested.jar!/entry`
Unlike the previous `jar:jar:/my,jar!/nested.jar!/entry` URL format,
the new format is compatible with Java's default Jar URL handler.
Specifically, it now only uses a single `jar:` prefix and it no longer
includes multiple `!/` separators.
In addition to the changes above, many of the ancillary classes have
also been refactored and updated to create cleaner APIs.
Closes gh-37668
Create alternative launcher classes under the package
`org.springframework.boot.loader.launch` and use them in favor
of the previous location.
This update is designed to improve compatibility with future
changes in the loader.
Closes gh-37667
- Replace synchronized with Lock when guarding long-running operations
- Remove unnecessary synchronization in FileSystemWatcher
- Replace HashMap with ConcurrentHashMap in Restarter
- Remove unnecessary locking on AtomicBoolean in
SpringApplicationBuilder
- Remove unnecessary locking in SimpleFormatter
Closes gh-36670
Update `JarFile` so that the `close()` method no longer closes nested
jars or the wrapper. Prior to this commit it was possible for a parent
jar file to be garbage collected and closed even though references still
existed to the nested jars. When this happened the nested jars would get
closed and any access to entries would result in `JarFile.ensureOpen()`
throwing an `IllegalStateException`. The user would often not see this
exception directly, but rather find `ClassNotFoundException` being
thrown.
Fixes gh-31853
Update `JarFile` and related classes so that `close()` is not longer
called early.
Prior to this commit, we would always immediately close the underlying
jar file to prevent file locking issues with our build. This causes
issues on certain JVMs when they attempt to verify a signed jar.
The file lock issues have now been solved by returning a custom input
stream from `JarUrlConnection` which captures and delegates the close
method.
Fixes gh-29356
Update the Maven and Gradle packaging for war files so that a
`classpath.idx` file is written into the archive that provides the
original order of the classpath, as was previously done for jar files.
The `WarLauncher` class will use this file when running as an exploded
archive to ensure that the classpath order is the same as when running
from the far war.
Fixes gh-19875
Phillip Webb
Moritz Halbritter
Krzysztof Krason
Scott Frederick
Andy Wilkinson
Johnny Lim
aoyvx
Marc Wrobel
dreis2211
Lars Grefer
Gnaily
Stephane Nicoll
Yanming Zhou
Leo Li