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Matt Benson edited comment on MYFACES-2552 at 7/27/11 6:09 PM: --------------------------------------------------------------- For future reference, this issue can be worked around in any JSF 2+ environment by simply adding a custom ELResolver with this method: @Override public Class<?> getType(ELContext context, Object base, Object property) { if (base instanceof CompositeComponentExpressionHolder && property instanceof String) { ValueExpression expr = ((CompositeComponentExpressionHolder) base).getExpression((String) property); if (expr != null) { return expr.getType(context); } } return null; } Remaining methods should return {{null}}/{{false}} i.e. do nothing. was (Author: mbenson): For future reference, this issue can be worked around in any JSF 2+ environment by simply adding a custom ELResolver with this method: {noformat} @Override public Class<?> getType(ELContext context, Object base, Object property) { if (base instanceof CompositeComponentExpressionHolder && property instanceof String) { ValueExpression expr = ((CompositeComponentExpressionHolder) base).getExpression((String) property); if (expr != null) { return expr.getType(context); } } return null; } {noformat} Remaining methods should return {{null}}/{{false}} i.e. do nothing. > TagValueExpression.getType() returns null if the property in the managed bean > is null and the expression points to a facelets composite component attribute > ----------------------------------------------------------------------------------------------------------------------------------------------------------- > > Key: MYFACES-2552 > URL: https://issues.apache.org/jira/browse/MYFACES-2552 > Project: MyFaces Core > Issue Type: Bug > Components: JSR-314 > Affects Versions: 2.1.0 > Reporter: Jakob Korherr > Assignee: Jakob Korherr > Attachments: MYFACES-2552-spec-proposal.patch > > > if you have a facelets composite component with an attribute "test" that > points to a property in a managed bean (e.g. #{myBean.property}) which is > currently null and you refer to that attribute in the implementation via > #{cc.attrs.test} you can get the current value (null) or set a new value but > you cannot get the type of the property (e.g. String[]). However if the > property in the managed bean is non-null you can get the type. > For example: > <cc:interface name="mycomponent"> > <cc:attribute name="test" required="true"/> > </cc:interface> > <cc:implementation> > <h:selectManyListbox value="#{cc.attrs.test}"> > <f:selectItems value="#{some select items}"/> > </h:selectManyListbox> > </cc:implementation> > --> calling #{cc.attrs.test}.getType() will fail if #{cc.attrs.test} resolves > to null, but will work if #{cc.attrs.test} resolves to some valid value. > This currently results in a NullPointerException in > _SharedRendererUtils.getConvertedUISelectManyValue(). -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira