JSF 2.3 with Java 10&11 not recognizing generic types with f:viewParam

[eclipse-faces-bot]

If you have an abstract class with generic types and try to set that attribute with f:viewParam, always get String type if running with Java 11. If you run the same code with Java 8, it works as expected. Ex:

/** CrudBean.java */
...
public abstract class CrudBean<K, E extends DomainEntity<K>> {
  private K id;
  private E e; 
...
  public K getId() {
    return id;
  }

  public void setId(K id) {
    this.id = id;
  }
...

/** ZoneBean.java */
...
@Named
@ViewScoped
public class ZoneBean extends CrudBean<Integer, Zone> implements Serializable {
...

zone.xhtml

...
<f:metadata>
  <f:viewParam name="id" value="#{zoneBean.id}"/>
</f:metadata>
...

When you run this code in Java 8, the id attribute set the value as Integer. In Java 10&11, the id attribute set the value as String and JSF throws the following error: javax.servlet.ServletException: Provided id of the wrong type for class Zone. Expected: class java.lang.Integer, got class java.lang.String

Technologies used:

• Wildfly 14
• JSF 2.3
• JEE 8.0

[eclipse-faces-bot]

• Issue Imported From: https://github.com/javaee/javaserverfaces-spec/issues/1468
• Original Issue Raised By:@maxcav7
• Original Issue Assigned To: Unassigned

[eclipse-faces-bot]

@maxcav7 Commented The workaround for this problem is to set the converter in the f:viewParam. Ex: <f:viewParam name="id" value="#{zoneBean.id}" converter="javax.faces.Integer"/>