Java 8 default methods not detected as bean properties [SPR-14198]

[spring-projects-issues]

Conor Gallagher opened SPR-14198 and commented

As the title suggests, Spring 4.2.5.RELEASE cannot inject into Java 8 default methods via xml context files.

I have thrown together a simple example on GitHub to demonstrate how this fails:

    void setSomeDate(LocalDate localDate);

    default void setSomeDateInDayMonthYear(String dayMonthYear) {
        setSomeDate(LocalDate.parse(dayMonthYear, DateTimeFormatter.ofPattern("dd/MM/yyyy")));
    }

An egregious workaround is to reference the default method from the implementation as follows:

@Override
public void setSomeDateInDayMonthYear(String dayMonthYear) {
    SomeInterface.super.setSomeDateInDayMonthYear(dayMonthYear);
}

Also referenced on SO:
http://stackoverflow.com/questions/30477367/spring-4-cannot-execute-java-8-default-methods

---

Affects: 4.2.5

Reference URL: https://github.com/cjbooms/spring-default-methods

Issue Links:

• @Bean on Java 8 default methods in interfaces [SPR-10919] #15547 @Bean on Java 8 default methods in interfaces
• CachedIntrospectionResults should build complete descriptor for setter/getter across interface hierarchy [SPR-16978] #21516 CachedIntrospectionResults should build complete descriptor for setter/getter across interface hierarchy
• CachedIntrospectionResults should use BeanInfoFactory when introspecting implemented interfaces [SPR-16322] #20869 CachedIntrospectionResults should use BeanInfoFactory when introspecting implemented interfaces

Referenced from: commits ce2f28d

[spring-projects-issues]

Juergen Hoeller commented

Unfortunately, even the JDK's own JavaBeans Introspector does not detect setters and getters as default methods. I've added some explicit code to our CachedIntrospectionResults, querying the introspector explicitly for each implemented interface and adding missing bean properties that way.

This will be available in the upcoming 4.3.0.BUILD-SNAPSHOT and make it into 4.3 RC2.

[spring-projects-issues]

Conor Gallagher commented

Great work, thank you.