When an application is run as an executable archive with nested jars,
the application's own classes need to be able to load classes from
within the nested jars. This means that the application's classes need
to be loaded by the same class loader as is used for the nested jars.
When an application is launched with java -jar the contents of the
jar are on the class path of the app class loader, which is the
parent of the LaunchedURLClassLoader that is used to load classes
from within the nested jars. If the root of the jar includes the
application's classes, they would be loaded by the app class loader
and, therefore, would not be able to load classes from within the
nested jars.
Previously, this problem was resolved by LaunchedURLClassLoader being
created with a copy of all of the app class laoder's URLs and by
using an unconventional delegation model that caused it to skip its
parent (the app class loader) and jump straight to its root class
loader. This ensured that the LaunchedURLClassLoader would load both
the application's own classes and those from within any nested jars.
Unfortunately, this unusual delegation model has proved to be
problematic. We have seen and worked around some problems with Java
Agents (see gh-4911 and gh-863), but there are others (see gh-4868)
that cannot be made to work with the current delegation model.
This commit reworks LaunchedURLClassLoader to use a conventional
delegate model with the app class loader as its parent. With this
change in place, the application's own classes need to be hidden
from the app class loader via some other means. This is now achieved
by packaging application classes in BOOT-INF/classes (and, for
symmetry, nested jars are now packaged in BOOT-INF/lib). Both the
JarLauncher and the PropertiesLauncher (which supports the executable
jar layout) have been updated to look for classes and nested jars in
these new locations.
Closes gh-4897
Fixes gh-4868
It seems that the code for executing a groovy closure from the
OptionHandler is never executed and therefore not needed.
Removing the code gives the benefit that the Groovy-classes are not
needed if someone else wants to use the spring-boot-cli infrastructure to
run his own cli interface.
Closes gh-4411
Previously, MavenSettings used a FileProfileActivator with no
PathTransformer. If a settings.xml file contains a file-activated
profile this would result in an NPE within Maven. This was made worse
by the NPE not being included in the resulting failure message which
hampered diagnosis of the problem.
This commit updates MavenSettings to configure its FileProfileActivator
with a PathTransformer. It also improves the failure message that’s
created from any problems that are reported by Maven while determining
the active profiles to include a problem’s exception if it has one.
Closes gh-4826
Update exit code support to allow the ExitCodeGenerator interface to
be placed on an Exception. Any uncaught exception implementing the
interface and returning a non `0` status will now trigger a System.exit
with the code.
Fixes gh-4803
Ensure that Collections.isEmpty() is used to check if there are no
elements in a collections. This is more explicit and can be faster than
calling .size().
Closes gh-4783
The CLI application advertises `-cp` support but it appears that only
`--cp` is really supported. The fix for gh-178 forgot to update the
call to `getParser().parse(...)`.
See gh-178
Spring Initalizr now bundles a wrapper script for the build system. While
that wrapper has the necessary execute flag in the zip archive, that flag
is lost as the zip abstraction does not honor those.
The init command now makes sure to restore the execute flag on `mvnw`
and `gradlew` if necessary.
Unfortunately, this can't be tested as the Windows build would fail to
assert that the executable flag has been propertly set.
Closes gh-4392
Plugin authors can extend this class, provide missing methods,
and specify a BOM to add to the dependency management lookup
(i.e. dependencies by artifactId)
Certain Maven profile activator’s require access to System properties
to determine whether or not a profile should be activated.
JdkVersionProfileActivator is one such activator.
Prior to this commit, the presence of a Maven profile that was activated
based on the JDK in a bom imported using @DependencyManagementBom in the
CLI would trigger a failure as the JdkVersionProfileActivator could not
determine the version of Java on which it was running.
This commit updates the CLI to pass the JVM’s System properties to the
request to build a bom’s model so that those system properties can be
used by JdkVersionProfileActivator (and any other activators which need
them).
Andy Wilkinson
Phillip Webb
Stephane Nicoll
Johannes Edmeier
mnhock
Spring Buildmaster
Kirill Vlasov
Johnny Lim
Matt Benson
Andrey Stolyarov
Dave Syer