Steps to Reproduce

compare: calling a bean method via EL using a matching or non matching parameter type

1) calling concat(String)

        <label value="${'asdf'.concat('astring')}"/>

2) calling concat(Long)

        <label value="${'asdf'.concat(1234)}"/>

Current Result

case 1) will identify the method directly and invoke it efficiently

case 2) will fail to find the method initially throw/catch a MethodNotFound exception, and then loop through all available methods on the class until it finds a potential match
(this exception + loop happens every time)

Expected Result

ideally a matching method should be cached (if efficiently possible)
avoiding the exception and the loop

Debug Information

https://github.com/zkoss/zk/blob/v9.0.0/zel/src/org/zkoss/zel/BeanELResolver.java#L209-L222

Workaround

for the String.concat case use the concatenation '+=' operator

        <label value="${'asdf' += 1234}"/>
        <!-- for data binding extra parentheses are required -->
        <label value="@init(('asdf' += 1234))"/>
        <label value="@load(('asdf' += 1234))"/>

Avoid calling methods by implementing dedicated bean getters:

        <label value="@init(vm.buildFullName(person))"/>
        <!-- can be replaced by -->
        <label value="@init(person.fullName)"/>

and implement a getFullName method on the bean class