JSF Não passa variável ( exercicio ) no botão comand link excluir

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<?xml version="1.0" encoding="utf-8"?>
Body

Pesquisa Geral
 

Pesquisar 
							<button id="pesquisa_adin" name="pesquisa_adin"
								class="btn btn-warning">Editar</button>

							<button id="pesquisa_adin" name="pesquisa_adin"
								class="btn btn-warning">Excluir</button>
						</div>
						<h:form>
						
							<h:dataTable value="#{exercicioBean.listarExercicio}"
								var="exercicio" border="5">

								<h:column>
									<f:facet name="header">
										<h:outputText value="ID" />
									</f:facet>
									<h:outputText value="#{exercicio.id}" />
								</h:column>


								<h:column>
									<f:facet name="header">
										<h:outputText value="Nome" />
									</f:facet>
									<h:outputText value="#{exercicio.nome}" />
								</h:column>

								<h:column>
									<f:facet name="header">
										<h:outputText value="repeti" />
									</f:facet>
									<h:outputText value="#{exercicio.repeti}" />
								</h:column>

								<h:column>
									<f:facet name="header">
										<h:outputText value="Serie" />
									</f:facet>
									<h:outputText value="#{exercicio.serie}" />
								</h:column>

								<h:column>
									<f:facet name="header">
										<h:outputText value="Tipo" />
									</f:facet>
									<h:outputText value="#{exercicio.tipo}" />
									
								</h:column>
								<h:column>
								<f:facet name="header">
								<h:outputText value="Ação" />
								</f:facet>
								<h:commandLink action="#{exercicioBean.editar(exercicio)}" value="Editar"/>
								<h:outputText value="  /  "/>
								<f:facet name="header">Ação</f:facet>
								<h:commandLink action="#{exercicioBean.excluirExercicio()}" value="Editar" />																				
								</h:column>
							</h:dataTable>
						</h:form>

					</div>
				</fieldset>
			</form>
			<p></p>
		</div>
		<h2></h2>
	</div>
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