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https://issues.apache.org/jira/browse/EL-13?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521085
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Henri Yandell commented on EL-13:
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Thanks for responding Joe.
With the unit test, I don't have a BeanInfoManager.getProperty(String, Logger)
method. Just a getProperty(String) method.
What are you compiling against?
> Boolean bean property not found due to Introspector limitation
> --------------------------------------------------------------
>
> Key: EL-13
> URL: https://issues.apache.org/jira/browse/EL-13
> Project: Commons EL
> Issue Type: Bug
> Affects Versions: 1.0
> Environment: Windows XP, Java 1.5.0_07-b03, Tomcat 5.5.17
> Reporter: Joe Littlejohn
> Fix For: 1.1
>
> Attachments: AdditionalIntrospection.java,
> AdditionalIntrospection.java, AdditionalIntrospection.java,
> AdditionalIntrospection.java, AdditionalIntrospection.java,
> BeanInfoManagerTest.java, BeanInfoManagerTest.java, el_exception.txt
>
>
> There is a bug in the java.beans.Introspector which means that it cannot find
> the read method for a property of Boolean type (because it looks for the "get"
> prefix, not the "is" prefix). This is arguably the expected behaviour of the
> Introspector, however since the java.beans.PropertyDescriptor acts differently
> (it can identify the property read method), this inconsistency hints it's a
> bug.
> Also, with the advent of autoboxing, developers are supposed to be able to
> free
> themselves from primitive types.
> The commons EL library is affected by this bug, so using an interface like: -
> public interface Bean {
> Boolean isEnabled();
> }
> and an expression like: -
> ${bean.enabled}
> fails with an ELException saying that the property could not be found (see
> attached log snippet).
> WebLogic does not suffer from this problem, presumably because they implement
> their own EL parser (don't use commons.el) which doesn't use the
> Introspector. I
> have written a suggested workaround for this problem which would allow the
> commons.el library to continue its use of the Introspector, but deal with this
> flaw (see attached). The AdditionalIntrospection could be used in the
> BeanInfoManager.initialise() method, like so: -
> PropertyDescriptor [] pds = mBeanInfo.getPropertyDescriptors ();
> pds = AdditionalIntrospection.findMissingMethods(mBeanClass, pds); // new step
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