src-spring-framework

Spring Framework

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Chris Beams b2ae3dbb47 Avoid 'type mismatch' errors in ExtendedBeanInfo Certain edge cases around return type covariance can trigger an IntrospectionException when trying to create a new PropertyDescriptor; particularly around the addition of write methods with parameter types that do not match read method return types. These type mismatch exceptions are raised during normal Introspector operations as well (i.e. without ExtendedBeanInfo in the mix), but the Introspector intentionally supresses them. In covariance cases, there is often already a suitable write method present, e.g. discovered in a supertype or superinterface, that, with the benefit of bridge methods works just fine in practice at runtime. That is to say, in these suppression cases, the rejection of the write method is 'OK' in that there is already a write method present that can handle a call. ExtendedBeanInfo now mirrors this suppression behavior, but does issue a WARN-level log message to let the user know. An important effect of this change is that ExtendedBeanInfo now modifies the delegate BeanInfo object, whereas previously it did not. In practice this probably matters very little, but it is a design change worth noting. The reason for this change was to avoid the need to create new PropertyDescriptors wherever possible. It was discovered that by updating existing PDs, one can avoid these IntrospectionExceptions a greater percentage of the time. Issue: SPR-8806		13 years ago
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src	Avoid 'type mismatch' errors in ExtendedBeanInfo	13 years ago
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