<h:form>			
	<h:commandLink value="ссылка" action="#{formBean.newtask}" />			
</h:form>

<p:dataList id="dataList" value="#{dataBean.activeTasks}" var="task"
      type="ordered" emptyMessage="empty list">
...
</p:dataList>

import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.inject.Named;
import data.Dao;

@Named
@RequestScoped
public class DataBean {
	
	@Inject
	private Dao dao;
	
	@Inject
	private UserBean userBean;
	
	private List<Task> activeTasks = new ArrayList<>();
	
	@PostConstruct
	private void init() {
		activeTasks = dao.getTasks(userBean.getEmail());
	}

	public List<Task> getActiveTasks() {
		return activeTasks;
	}
} 

public List<Task> getTasks(String email) {
    ...
    if(activeTasks.isEmpty()) {
	logger.info("activeTasks is empty");
    }
    return activeTasks;
}

<h:form>
	<h:link value="new task" outcome="newtask" />					
</h:form>
		
<p:panel id="panel">
				
	<p:dataList id="dataList" value="#{dataBean.activeTasks}" var="task">
		...
	</p:dataList>

	<h:form>
		<p:commandButton value="new task" action="newtask" />
	</h:form>
		
</p:panel>