It is currently possible for one Bean Override to override another
logically equivalent Bean Override.
For example, a @TestBean can override a @MockitoBean, and vice versa.
In fact, it's also possible for a @MockitoBean to override another
@MockitoBean, for a @TestBean to override a @TestBean, etc.
However, there may be viable use cases for one override overriding
another override. For example, one may have a need to spy on a bean
created by a @TestBean factory method.
In light of that, we do not prohibit one Bean Override from overriding
another Bean Override; however, with this commit we now log a warning
to help developers diagnose issues in case such an override is
unintentional.
For example, given the following test class, where TestConfig registers
a single bean of type MyService named "myService"...
@SpringJUnitConfig(TestConfig.class)
class MyTests {
@TestBean(methodName = "example.TestUtils#createMyService")
MyService testService;
@MockitoBean
MyService mockService;
@Test
void test() {
// ...
}
}
... running that test class results in a log message similar to the
following, which has been formatted for readability.
WARN - Bean with name 'myService' was overridden by multiple handlers:
[
[TestBeanOverrideHandler@44b21f9f
field = example.MyService example.MyTests.testService,
beanType = example.MyService,
beanName = [null],
strategy = REPLACE_OR_CREATE
],
[MockitoBeanOverrideHandler@7ee8130e
field = example.MyService example.MyTests.mockService,
beanType = example.MyService,
beanName = [null],
strategy = REPLACE_OR_CREATE,
reset = AFTER,
extraInterfaces = set[[empty]],
answers = RETURNS_DEFAULTS, serializable = false
]
]
NOTE: The last registered BeanOverrideHandler wins. In the above
example, that means that @MockitoBean overrides @TestBean, resulting
in a Mockito mock for the MyService bean in the test's
ApplicationContext.
Closes gh-34056
Prior to this commit, the Bean Override feature in the Spring
TestContext Framework (for annotations such as @MockitoBean and
@TestBean) silently allowed one bean override to override another
"identical" bean override; however, Spring Boot's @MockBean and
@SpyBean support preemptively rejects identical overrides and throws
an IllegalStateException to signal the configuration error to the user.
To align with the behavior of @MockBean and @SpyBean in Spring Boot,
and to help developers avoid scenarios that are potentially confusing
or difficult to debug, this commit rejects identical bean overrides in
the Spring TestContext Framework.
Note, however, that it is still possible for a bean override to
override a logically equivalent bean override. For example, a
@TestBean can override a @MockitoBean, and vice versa.
Closes gh-34054
This metadata information is required for supporting libraries using
`sun.misc.Unsafe#allocateInstance(Class<?>)`, even though Spring
Framework is not using this feature.
Closes gh-34055
To make an analogy to read phenomena for transactional databases, this
commit effectively fixes the "Phantom Read" problem for Bean Overrides.
A phantom read occurs when the BeanOverrideBeanFactoryPostProcessor
retrieves a set of bean names by-type twice and a new bean definition
for a compatible type has been created in the BeanFactory by a
BeanOverrideHandler between the first and second retrieval.
Continue reading for the details...
Prior to this commit, the injection of test Bean Overrides (for
example, when using @MockitoBean) could fail in certain scenarios if
overrides were created for nonexistent beans "by type" without an
explicit name or qualifier. Specifically, if an override for a SubType
was created first, and subsequently an attempt was made to create an
override for a SuperType (where SubType extends SuperType), the
override for the SuperType would "override the override" for the
SubType, effectively removing the override for the SubType.
Consequently, injection of the override instance into the SubType field
would fail with an error message similar to the following.
BeanNotOfRequiredTypeException: Bean named 'Subtype#0' is expected to
be of type 'Subtype' but was actually of type 'Supertype$Mock$XHb7Aspo'
This commit addresses this issue by tracking all generated bean names
(in a generatedBeanNames set) and ensuring that a new bean override
instance is created for the current BeanOverrideHandler if a previous
BeanOverrideHandler already created a bean override instance that now
matches the type required by the current BeanOverrideHandler.
In other words, if the generatedBeanNames set already contains the
beanName that we just found by-type, we cannot "override the override",
because we would lose one of the overrides. Instead, we must create a
new override for the current handler. In the example given above, we
must end up with overrides for both SuperType and SubType.
Closes gh-34025
This commit restores the user class in generated RootBeanDefinition
instances. Previously the CGLIB subclass was exposed. While this is
important in regular runtime as the configuration class parser operates
on the bean definition, this is not relevant for AOT as this information
is internal and captured in the instance supplier.
Closes gh-33960
This commit fixes a regression in PlaceHolderParser where it would no
longer resolve nested placeholders for a case where the fallback has a
placeholder itself.
This is due to the Part implementations and how they are structure, and
this commit makes sure that nested resolution happens consistently.
Closes gh-34020
This commit restores the signature of instance suppliers that are
exposing a CGLIB proxy. While calling the CGLIB proxy itself, and
making it available in BeanInstanceSupplier, is needed internally, such
type should not be exposed as it is an internal concern.
This was breaking InstanceSupplier.andThen as it expects the public
type of the bean to be exposed, not it's eventual CGLIB subclass.
Closes gh-33998
Spring Framework 7.0 will use a Kotlin 2 baseline, using the latest 2.x
release at the time of the release.
This commit upgrades Kotlin to 2.1.0, and Kotlin Serialization and
Coroutines accordingly.
Closes gh-33629
As a preparation to using a Kotlin 2 baseline, this commit stops using
Java code snippets in Kotlin ones in order to avoid redeclaration
errors.
See gh-33629
