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Compensate for changes in JDK 7 Introspector
Prior to JDK 7, java.beans.Introspector registered indexed write methods irrespective of return type, for example either of the following methods were legal void setFoo(int i, Foo foo) Object setFoo(int i, Foo foo) This was considered a bug and disallowed starting with JDK 7, such that only the former signature is a candidate. Supporting non-void returning setter methods is exactly what ExtendedBeanInfo was designed to do, and prior to this commit, the implementation of ExtendedBeanInfo assumed this (somewhat surprising) behavior from the underlying Introspector, and because it worked out of the box, took no extra steps to recognize and register these methods. For this reason, non-void returning indexed write methods were not registered under JDK 7+, causing test failures in ExtendedBeanInfoTests. Now the implementation is careful to detect these methods without any assumption about Introspector behavior, such that they are registered in exactly the same fashion across JDK versions. Issue: SPR-9014
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