https://issues.apache.org/bugzilla/show_bug.cgi?id=52440
Bug #: 52440
Summary: Wrong getValueReference behaviour with Facelets
parameter expressions
Product: Tomcat 7
Version: 7.0.22
Platform: PC
Status: NEW
Severity: normal
Priority: P2
Component: Servlet & JSP API
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
ValueExpression method getValueReference should return base object and
property. But it returns null if ValueExpression is Facelets parameter.
Example:
someVar = #{concreteObject.property}
ValueExpression for #{someVar} return null from method getValueReference (guess
because it is simple expression #{someVar}), but logicaly it should return
parent expressions ValueReference (need hierachical ValueReference lookup).
I made workaround with Java Reflect API in my code and it illustrates problem:
ELContext elContext = FacesContext.getCurrentInstance().getELContext();
ValueReference reference = exp.getValueReference(elContext);
if (reference == null && exp instanceof TagValueExpressionUEL) {
ValueExpressionImpl origExp = (ValueExpressionImpl)
((TagValueExpressionUEL) exp).getWrapped();
// TODO: JR: find better way to get base and property. ! Code is not
portable because uses Tomcat EL implementation details. !
Field field = ReflectionUtils.findField(origExp.getClass(),
EL_IMPL_VAR_PROPERTY);
field.setAccessible(true);
VariableMapper varMapper = (VariableMapper) ReflectionUtils.getField(field,
origExp);
field = ReflectionUtils.findField(origExp.getClass(),
EL_IMPL_NODE_PROPERTY);
field.setAccessible(true);
SimpleNode node = (SimpleNode) ReflectionUtils.getField(field, origExp);
if (varMapper != null && node != null) {
ValueExpression parentExp = varMapper.resolveVariable(node.getImage());
if (parentExp != null) {
try {
reference = parentExp.getValueReference(elContext);
if (reference == null) {
reference = getValueReference(parentExp);
}
} catch (PropertyNotFoundException e) {
LOG.warn("Property not found: " + e.getMessage());
}
}
}
}
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