<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd">

  <bean id="processEngineConfiguration"
    class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">

    <property name="jdbcUrl" value="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000" />
    <property name="jdbcDriver" value="org.h2.Driver" />
    <property name="jdbcUsername" value="sa" />
    <property name="jdbcPassword" value="" />

    <!-- Database configurations -->
    <property name="databaseSchemaUpdate" value="true" />

    <!-- job executor configurations -->
    <property name="jobExecutorActivate" value="false" />

    <!-- mail server configurations -->
    <property name="mailServerPort" value="5025" />
    <property name="history" value="full" />
  </bean>

</beans>

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd">

  <bean id="processEngineConfiguration"
    class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">

    <property name="jdbcUrl" value="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000" />
    <property name="jdbcDriver" value="org.h2.Driver" />
    <property name="jdbcUsername" value="sa" />
    <property name="jdbcPassword" value="" />

    <!-- Database configurations -->
    <property name="databaseSchemaUpdate" value="drop-create" />

    <!-- job executor configurations -->
    <property name="jobExecutorActivate" value="false" />

    <!-- mail server configurations -->
    <property name="mailServerPort" value="5025" />
    <property name="history" value="full" />
  </bean>

</beans>

Change to drop-create to make sure the database is always recreated
Change to drop-create to make sure the database is always recreated
