After adding the LASTUPDATE column to a pdp table that already has data the value defaults to null.
When the pdp initialization process  queries the existing records it throws a nullpointer exception when it sees lastupdate is null.
 
This can be fixed in db-migrator by updating 0100-pdp.sql
ALTER TABLE pdp ADD COLUMN LASTUPDATE datetime NOT NULL DEFAULT CURRENT_TIMESTAMP AFTER HEALTHY;

Exception in thread "main" org.onap.policy.pap.main.PolicyPapRuntimeException: Start of policy-pap service failed.
at org.onap.policy.pap.main.startstop.Main.<init>(Main.java:93)
at org.onap.policy.pap.main.startstop.Main.main(Main.java:159)
[2021-08-31T10:33:24.754+00:00|ERROR|Main|main] failed to start Main
java.lang.NullPointerException: null
at org.onap.policy.models.pdp.persistence.concepts.JpaPdp.toAuthorative(JpaPdp.java:149)
at org.onap.policy.models.pdp.persistence.concepts.JpaPdpSubGroup.toAuthorative(JpaPdpSubGroup.java:200)
at org.onap.policy.models.pdp.persistence.concepts.JpaPdpGroup.toAuthorative(JpaPdpGroup.java:167)
at org.onap.policy.models.pdp.persistence.provider.PdpProvider.asPdpGroupList(PdpProvider.java:368)
at org.onap.policy.models.pdp.persistence.provider.PdpProvider.getPdpGroups(PdpProvider.java:70)
at org.onap.policy.models.provider.impl.DatabasePolicyModelsProviderImpl.getPdpGroups(DatabasePolicyModelsProviderImpl.java:213)
at org.onap.policy.pap.main.startstop.PapDatabaseInitializer.initializePapDatabase(PapDatabaseInitializer.java:72)
at org.onap.policy.pap.main.startstop.Main.<init>(Main.java:72)
at org.onap.policy.pap.main.startstop.Main.main(Main.java:159)
Caused by: java.lang.NullPointerException
at org.onap.policy.models.pdp.persistence.concepts.JpaPdp.toAuthorative(JpaPdp.java:149)
at org.onap.policy.models.pdp.persistence.concepts.JpaPdpSubGroup.toAuthorative(JpaPdpSubGroup.java:200)
at org.onap.policy.models.pdp.persistence.concepts.JpaPdpGroup.toAuthorative(JpaPdpGroup.java:167)
at org.onap.policy.models.pdp.persistence.provider.PdpProvider.asPdpGroupList(PdpProvider.java:368)
at org.onap.policy.models.pdp.persistence.provider.PdpProvider.getPdpGroups(PdpProvider.java:70)
at org.onap.policy.models.provider.impl.DatabasePolicyModelsProviderImpl.getPdpGroups(DatabasePolicyModelsProviderImpl.java:213)
at org.onap.policy.pap.main.startstop.PapDatabaseInitializer.initializePapDatabase(PapDatabaseInitializer.java:72)
at org.onap.policy.pap.main.startstop.Main.<init>(Main.java:72)