Upgrade is a property in the portal.properties file, which is the default configuration file for Sun GlassFish Web Space Server. You can override this property using portal-ext.properties file.
Input a list of comma-delimited class names that implement com.liferay.portal.upgrade.UpgradeProcess. These classes runs on startup to upgrade older data to match with the latest version.
upgrade.processes=\ com.liferay.portal.upgrade.UpgradeProcess_4_3_0,\ com.liferay.portal.upgrade.UpgradeProcess_4_3_1,\ com.liferay.portal.upgrade.UpgradeProcess_4_3_2,\ com.liferay.portal.upgrade.UpgradeProcess_4_3_3,\ com.liferay.portal.upgrade.UpgradeProcess_4_3_4,\ com.liferay.portal.upgrade.UpgradeProcess_4_3_5,\ com.liferay.portal.upgrade.UpgradeProcess_4_4_0,\ com.liferay.portal.upgrade.UpgradeProcess_5_0_0,\ com.liferay.portal.upgrade.UpgradeProcess_5_1_0 |