NullPointerException in service builder methods after upgrade to DXP 7.3

Issue

After upgrading the portal to DXP 7.3, the following stack trace in some custom modules is reported:

Caused by: java.lang.NullPointerException
       at com.liferay.portal.cache.internal.dao.orm.FinderCacheImpl._getArguments(FinderCacheImpl.java:466)
       at com.liferay.portal.cache.internal.dao.orm.FinderCacheImpl.updateByEntityCache(FinderCacheImpl.java:387)
       at com.liferay.portal.cache.internal.dao.orm.EntityCacheImpl._putResult(EntityCacheImpl.java:439)
       at com.liferay.portal.cache.internal.dao.orm.EntityCacheImpl.putResult(EntityCacheImpl.java:336)
       at com.liferay.portal.cache.internal.dao.orm.EntityCacheImpl.putResult(EntityCacheImpl.java:358)
       at com.liferay.portal.cache.internal.dao.orm.EntityCacheImpl.putResult(EntityCacheImpl.java:328)

Environment

DXP 7.3

Resolution

This issue happens due to the version of the classes generated by the service builder.

To solve this, some actions are required:

Change the service.xml file to:

<!DOCTYPE service-builder PUBLIC "-//Liferay//DTD Service Builder 7.3.0//EN" "http://www.liferay.com/dtd/liferay-service-builder_7_3_0.dtd">

Change the following settings in gradle.properties:
- ```
liferay.workspace.target.platform.version=7.3.0
```

Update the settings.gradle:

classpath(group: "com.liferay", name: "com.liferay.gradle.plugins.workspace", version: "3.4.8")

Regenerate the Service Builder.

Additional Information

Service Builder Basics.