On JBoss EAP 7.0.9, EAP 7.1.4 and EAP 7.2-beta the application is getting the error [i.] and the same code doesn't get the error running on JBoss EAP 6.4.21. In my research, I could identify that this error only happens on JBoss EAP 7.1.4 when:

1. The class called from the EL has a superclass;
2. The method called from the EL use an Enum as a parameter;

Note: If we remove the superclass or change the parameter to "String" for example, the error doesn't appear.

Code

a. The EL code:

	<f:view>
		<h:dataTable value="#{asfSfoSalesSucheQuery.asfLeistung}" var="leistung">
			<h:column>
				<f:facet name="header">
					<h:outputText value="nameS" />
				</f:facet>
				<h:outputText value="#{leistung.getPersonendatum('ANTRAGSTELLER_1_DOMIZIL').nameS}" />
			</h:column>
		</h:dataTable>
	</f:view>

b. The Superclass:

package de.entity;

import de.constants.PartnerdatenId;

public abstract class Leistung {
    abstract PersonDetails getPersonendatum(PartnerdatenId idPsn);
}

c. The implementation:

package de.entity;

import de.constants.PartnerdatenId;

import java.util.HashMap;
import java.util.Map;

public class AsfLeistung extends Leistung {
	
    private Map<PartnerdatenId, PersonLeistung> personenDaten = new HashMap<PartnerdatenId, PersonLeistung>();

    public AsfLeistung(String name, PartnerdatenId partnerdatenId) {
        PersonLeistung personLeistung = new PersonLeistung(name);
        personenDaten.put(partnerdatenId, personLeistung);
    }

    public PersonLeistung getPersonendatum(PartnerdatenId idPsn) {
        return personenDaten.get(idPsn);
    }
}

Debugging the jboss-el-api_3.0_spec-1.0.9.Final-redhat-1 code I found that:

a. The Line 572, List<Wrapper> wrappers = Wrapper.wrap(constructors); is returning 2 wrappers when we have a superclass;

b. The method *findWrapper(Class<?> clazz, List<Wrapper> wrappers, String name, Class<?>[] paramTypes, Object[] paramValues)

* can't find a match and resolve the Ambiguous Wrapper. *(Note that the ambiguous wrapper is happening because we have a superclass if we remove the superclass this method is not called)
*
d. I don't know why the EL code from JBoss EAP 6.4.21 is able to resolve the method with the Enum parameter even the XHTML page sending a string, and the JBoss EAP 7.1.4 don't.

Note: Also, I can't find any extra information on the Release notes and I found the same behavior on EAP 7.0.x

Note 2: I got the same error, even adding the Enum to the ELProcessor.

import javax.annotation.PostConstruct;
import javax.ejb.Singleton;
import javax.el.ELManager;
import javax.el.ELProcessor;

@Singleton
@javax.ejb.Startup
public class Startup {

	@PostConstruct
	public void init() {
	    ELProcessor elp = new ELProcessor();
	    ELManager elm =  elp.getELManager();
	    elm.importClass("de.constants.PartnerdatenId");
	    
	    elp.eval("PartnerdatenId.ANTRAGSTELLER_1_DOMIZIL");
	}
	
}

[i] Error

{{javax.servlet.ServletException: Unable to find unambiguous method: class de.entity.AsfLeistung.getPersonendatum(java.lang.String)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:671)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:65)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1501)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1501)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1501)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1501)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:330)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:812)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.el.MethodNotFoundException: Unable to find unambiguous method: class de.entity.AsfLeistung.getPersonendatum(java.lang.String)
at javax.el.Util.findWrapper(Util.java:322)
at javax.el.Util.findMethod(Util.java:203)
at javax.el.ELUtil.findMethod(ELUtil.java:295)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:405)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
at com.sun.el.parser.AstValue.getValue(AstValue.java:135)
at com.sun.el.parser.AstValue.getValue(AstValue.java:203)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:226)
at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
at javax.faces.component.UIOutput.getValue(UIOutput.java:174)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312)
at com.sun.faces.renderkit.html_basic.TableRenderer.renderRow(TableRenderer.java:385)
at com.sun.faces.renderkit.html_basic.TableRenderer.encodeChildren(TableRenderer.java:161)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:458)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:135)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)
... 39 more}}