Support for resolving no argument methods in an EL value expression
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Key: SEAMFACES-208
URL: https://issues.jboss.org/browse/SEAMFACES-208
Project: Seam Faces
Issue Type: Feature Request
Components: CDI Integration
Affects Versions: 3.1.0.Beta2
Reporter: Dan Allen
Fix For: 3.1.0.Final
The EL specification added support for resolving parameterized methods in value
and method expressions, with one exception. It does not support resolving
methods with 0 parameters. The reason is that an () used at the end of a
property is not acknowledged. As a result, the resolver attempts to resolve the
method name as a bean property.
For example, assume we have the method:
{code}
public Integer count() {
return 1;
}
{code}
If we attempt to resolve this in a value expression using:
{code}
#{bean.count()}
{code}
We can an error message "count property not found on bean"
It works as expected if the method has at least one parameter:
{code}
public Integer count(Integer i) {
return i;
}
{code}
The following expression will resolve to a value of 1.
{code}
#{bean.count(1)}
{code}
This also breaks resolving the size of a collection:
{code}
#{employees.size()}
{code}
In this case, the error is a bit strange because it tries to parse size as an
index.
The root cause of all this is that the spec does not properly honor 0
parameters as a valid number of parameters for a parameterized methods.
Instead, it ignores the () and treats the expression as a property.
Method expressions does not have this limitation since both .action and
.action() are equivalent expressions.
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