alfresco - How to set email and data configuration in activiti-explorer-5.22 -

i changed in activiti-custom-context.xml file , after changes not able send email users , have changed database properties after relaunch server ,my server not connected database ,which provided.

<class="org.springframework.jdbc.datasource.simpledriverdatasource">         <property name="driverclass" value="com.mysql.jdbc.driver" />         <property name="url" value="jdbc:mysql://localhost:3306/explorer" />         <property name="username" value="root" />         <property name="passw`enter code here`ord" value="root" />     </bean> -->       <bean id="transactionmanager"         class="org.springframework.jdbc.datasource.datasourcetransactionmanager">         <property name="datasource" ref="datasource" />     </bean>       </property>     <property name="mailserverusetls" value="true" /><!--this important if use gmail hoster -->     <property name="mailserverhost" value="smtp.gmail.com" />     <property name="mailserverport" value="587" />     <property name="mailserverusername" value="my@host.com" />     <property name="mailserverpassword" value="hostpassword"/>        </bean>      <bean id="processengine" class="org.activiti.spring.processenginefactorybean">         <property name="processengineconfiguration" ref="processengineconfiguration" />     </bean>      <bean id="repositoryservice" factory-bean="processengine" factory-method="getrepositoryservice" />     <bean id="runtimeservice" factory-bean="processengine" factory-method="getruntimeservice" />     <bean id="taskservice" factory-bean="processengine" factory-method="gettaskservice" />     <bean id="formservice" factory-bean="processengine" factory-method="getformservice" />     <bean id="historyservice" factory-bean="processengine" factory-method="gethistoryservice" />     <bean id="managementservice" factory-bean="processengine" factory-method="getmanagementservice" />     <bean id="identityservice" factory-bean="processengine" factory-method="getidentityservice" />    </beans>