I looked at Seam EntityQuery and I think this is by design even EntityQuery evaluates Expressions after you call getResultList() method so it is impossible to evaluate expressions in Constructor.

is this correct ?

@Name("projectFilter")
@Scope(Scope.Conversation)
public class ProjectFilter implements Serializable{

private ProjectFilterParameters projectFilterParameters = new ProjectFilterParameters();

public ProjectFilterParameters getProjectFilterParameters(){
   return projectFilterParameters;
}

public ProjectFilter(){
   System.out.println(Expressions.instance().createValueExpression("#{projectFilter.projectFilterParameters.program1Id}").getValue()) // cause stackoverflow
}

}

public class ProjectFilterParameters implements Serializable {
   private Long program1Id;

   public void setProgram1Id(long program1Id){
     this.program1Id = program1Id;
}

public long getProgram1Id(){
return program1Id;
}

}

<param name="program1Id" value="#{projectFilter.projectFilterParameters.program1Id}"/>

<h:form>
<h:inputText value="#{projectFilter.projectFilterParameters.program1Id}" id="program1Id" />
<h:commandButton value="Search" action="/projectFilter.xhtml" />
</h:form>