Can I use HashUtil, StringBundler, ProviderType, and AopService in DXP 7.4 after upgrading from 7.0

Issue

• Can these 4 classes (HashUtil, StringBundler, ProviderType, and AopService) still be used in DXP 7.4 after upgrading from DXP 7.0?

Environment

• Liferay DXP 7.0, 7.4

Resolution

• AopService.java does not exist on DXP 7.0 but exists and is available on Liferay DXP 7.4. Refer to: AopService.java
• For ProviderType, this can still be used in DXP 7.4. An example of this: KaleoProcessLinkModel.java#L21 
• HashUtil, StringBundler are still available in DXP 7.4.