Bean-derived null values may still get passed into bean properties and injection points but only if those are declared as non-required. Note that getBean will never return null; a manual bean.equals(null) / "null".equals(bean.toString()) check identifies expected null values now. This will only ever happen with custom FactoryBeans or factory methods returning null - and since all common cases are handled by autowiring or bean property values in bean definitions, there should be no need to ever manually check for such a null value received from getBean.
Issue: SPR-15829
This commit adds a test runtime dependency on log4j 2 for every project
and migrates all log4j.properties files to log4j2-test.xml files.
Issue: SPR-14431
Prior to this commit, the codebase was using a mix of log4j.xml
and log4j.properties for test-related logging configuration. This
can be an issue as log4j takes the xml variant first when looking
for a default bootstrap configuration.
In practice, some modules declaring the properties variant were
taking the xml variant configuration from another module.
The general structure of the configuration has also been
harmonized to provide a standard console output as well as an
easy way to enable trace logs for the current module.
Prior to this change, spring-beans contained its own META-INF containing
spring.handlers and spring.schemas files in src/main/resources; it also
had files of the same name within src/test/resources/META-INF, causing
'duplicate resource' warnings and confusion in general.
This commit moves the com.foo test package, it's associated namespace
parsing tests and test versions of META-INF files to the root project
and it's src/test integration testing folder.
Issue: SPR-9431
Prior to this commit many test utility classes and sample beans were
duplicated across projects. This was previously necessary due to the
fact that dependent test sources were not shared during a gradle
build. Since the introduction of the 'test-source-set-dependencies'
gradle plugin this is no longer the case.
This commit attempts to remove as much duplicate code as possible,
co-locating test utilities and beans in the most suitable project.
For example, test beans are now located in the 'spring-beans'
project.
Some of the duplicated code had started to drift apart when
modifications made in one project where not ported to others. All
changes have now been consolidated and when necessary existing tests
have been refactored to account for the differences.
Conflicts:
spring-beans/src/test/java/org/springframework/beans/factory/ConcurrentBeanFactoryTests.java
spring-beans/src/test/java/org/springframework/beans/factory/support/BeanFactoryGenericsTests.java
spring-beans/src/test/java/org/springframework/beans/support/PagedListHolderTests.java
Prior to this change, CachedIntrospectionResults delegated to
ExtendedBeanInfo by default in order to inspect JavaBean
PropertyDescriptor information for bean classes.
Originally introduced with SPR-8079, ExtendedBeanInfo was designed to
go beyond the capabilities of the default JavaBeans Introspector in
order to support non-void returning setter methods, principally to
support use of builder-style APIs within Spring XML. This is a complex
affair, and the non-trivial logic in ExtendedBeanInfo has led to various
bugs including regressions for bean classes that do not declare
non-void returning setters.
This commit takes advantage of the new BeanInfoFactory mechanism
introduced in SPR-9677 to take ExtendedBeanInfo out of the default code
path for CachedIntrospectionResults. Now, the new
ExtendedBeanInfoFactory class will be detected and instantiated (per its
entry in the META-INF/spring.beanInfoFactories properties file shipped
with the spring-beans jar). ExtendedBeanInfoFactory#supports is invoked
for all bean classes in order to determine whether they are candidates
for ExtendedBeanInfo introspection, i.e. whether they declare non-void
returning setter methods.
If a class does not declare any such non-standard setter methods (the
99% case), then CachedIntrospectionResults will fall back to the
default JavaBeans Introspector. While efforts have been made to fix any
bugs with ExtendedBeanInfo, this change means that EBI will not pose
any future risk for bean classes that do not declare non-standard
setter methods, and also means greater efficiency in general.
Issue: SPR-9723, SPR-9677, SPR-8079
Before this commit, the CachedIntrospectionResults was hard-coded to
create ExtendedBeanInfos for bean classes. The ExtendedBeanInfo support
the JavaBeans property contract only.
This commit introduces the BeanInfoFactory, a strategy for creating
BeanInfos. Through this strategy, it is possible to support
beans that do not necessarily implement the JavaBeans contract (i.e.
have a different getter or setter style).
BeanInfoFactories are are instantiated by the
CachedIntrospectionResults, which looks for
'META-INF/spring.beanInfoFactories' files on the class path. These files
contain one or more BeanInfoFactory class names. When a BeanInfo is to
be created, the CachedIntrospectionResults will iterate through the
factories, asking it to create a BeanInfo for the given bean class. If
none of the factories support it, an ExtendedBeanInfo is created as a
default.
This commit also contains a change to Property, allowing BeanWrapperImpl
to specify the property name at construction time (as opposed to using
Property#resolveName(), which supports the JavaBeans contract only).
Issue: SPR-9677
Currently, if a factory method is parameterized and the corresponding
variable types are declared on the method itself instead of on the
enclosing class or interface, Spring always predicts the return type to
be Object, even if the return type can be explicitly inferred from the
method signature and supplied arguments (which are available in the bean
definition).
This commit introduces a new resolveParameterizedReturnType() method in
GenericTypeResolver that attempts to infer the concrete type for the
generic return type of a given parameterized method, falling back to the
standard return type if necessary. Furthermore,
AbstractAutowireCapableBeanFactory now delegates to
resolveParameterizedReturnType() when predicting the return type for
factory methods.
resolveParameterizedReturnType() is capable of inferring the concrete
type for return type T for method signatures similar to the following.
Such methods may potentially be static. Also, the formal argument list
for such methods is not limited to a single argument.
- public <T> T foo(Class<T> clazz)
- public <T> T foo(Object obj, Class<T> clazz)
- public <V, T> T foo(V obj, Class<T> clazz)
- public <T> T foo(T obj)
Issue: SPR-9493
Previously, the <value> subelement of a map <entry> allowed one to
specify the type of a specific map entry value. This patch allows a
value-type attribute as well, such that instead of the following
syntax
<entry key="x-message-ttl">
<value type="java.lang.Long">100</value>
</entry>
<entry key="x-ha-policy" value="all" />
one can now use the more concise form
<entry key="x-message-ttl" value="100" value-type="java.lang.Long"/>
<entry key="x-ha-policy" value="all"/>
The new value-type attribute may be used at the <map> level as well,
indicating that all elements are of the same type.
Appropriate tests have been added exercising value-type at the <map> and
<entry> levels.
Issue: SPR-9249
This renaming more intuitively expresses the relationship between
subprojects and the JAR artifacts they produce.
Tracking history across these renames is possible, but it requires
use of the --follow flag to `git log`, for example
$ git log spring-aop/src/main/java/org/springframework/aop/Advisor.java
will show history up until the renaming event, where
$ git log --follow spring-aop/src/main/java/org/springframework/aop/Advisor.java
will show history for all changes to the file, before and after the
renaming.
See http://chrisbeams.com/git-diff-across-renamed-directories
