The following errors occur while running srvctl status service command.

[oracle@<db_name> ~]$ srvctl status service -d <dbservice_name>
Exception in thread "main" java.lang.NullPointerException
at oracle.ops.opsctl.StatusAction.internalExecuteService(StatusAction.java:2038)
at oracle.ops.opsctl.StatusAction.executeSIHAService(StatusAction.java:1652)
at oracle.ops.opsctl.Action.executeSIHA(Action.java:443)
at oracle.ops.opsctl.OPSCTLDriver.execute(OPSCTLDriver.java:537)
at oracle.ops.opsctl.OPSCTLDriver.main(OPSCTLDriver.java:25) 
[oracle@<db_name> ~]$ srvctl status database -d <db_name>
Database is running.

[oracle@<db_name> ~]$ srvctl config database -d <db_name>
Database unique name: <db_name>
Database name: <db_name>
Oracle home: <rdbms_home>/product/12.2.0.3/db_1
Oracle user: oracle
Spfile: +<diskgroup_name>/<db_name>/spfile<dba_name>.ora
Password file:
Domain: <domain_name>
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Disk Groups: +<diskgroup_name1>,+<diskgroup_name2>
Services:<db_service>
OSDBA group:
OSOPER group:
Database instance: <db_name>

[oracle@<db_name> ~]$ srvctl config service -d <dbservice_name>
Service name:<dbservice_name>
Cardinality: SINGLETON
Service role: PRIMARY
Management policy: AUTOMATIC
DTP transaction: false
AQ HA notifications: false
Global: false
Commit Outcome: false
Failover type:
Failover method:
Failover retries:
Failover delay:
Failover restore: NONE
Connection Load Balancing Goal: LONG
Runtime Load Balancing Goal: NONE
TAF policy specification: NONE
Edition:
Pluggable database name:
Hub service:
Maximum lag time: ANY
SQL Translation Profile:
Retention: 86400 seconds
Replay Initiation Time: 300 seconds
Drain timeout:
Stop option:
Session State Consistency: DYNAMIC
GSM Flags: 0
Service is enabled
Service uses Java: false

 srvm.trc

[main] [ 2019-05-22 11:17:58.926 EDT ] [EntityOperations.isEntityRegisteredCRSD:367] entity: ora.<db_name>.<service_name>.svc, type: 1, registered: true
[main] [ 2019-05-22 11:17:58.926 EDT ] [CRSCache.getAttributesFromCRS:155] CRS: name: ora.<db_name>.<service_name>.svc, type 1, node: null
[main] [ 2019-05-22 11:17:58.926 EDT ] [CRSCache.getAttributesFromCRS:156] attrs: [SERVER_POOLS, CARDINALITY, USR_ORA_DISCONNECT, ROLE, MANAGEMENT_POLICY, DTP, AQ_HA_NOTIFICATION, COMMIT_OUTCOME, FAILOVER_TYPE, FAILOVER_METHOD, FAILOVER_RETRIES, FAILOVER_RESTORE, TAF_FAILOVER_DELAY, CLB_GOAL, RLB_GOAL, GLOBAL, MAX_LAG_TIME, RETENTION, REPLAY_INITIATION_TIME, SESSION_STATE_CONSISTENCY, SERVICE_NAME_PQ, SERVICE_TYPE, GSM_FLAGS, TABLE_FAMILY_ID, DRAIN_TIMEOUT, STOP_OPTION, CSS_CRITICAL, TAF_POLICY, EDITION, PLUGGABLE_DATABASE, HUB_SERVICE, MAX_LAG_TIME, SQL_TRANSLATION_PROFILE, ACTIONS, ACTIVE_PLACEMENT]
[main] [ 2019-05-22 11:17:58.989 EDT ] [CRSCache.getAttributesFromCRS:163] CRS: [<ACTIONS:isJavaService,group:"dba",user:"oracle" rf_action,group:"dba",user:"oracle">, <ACTIVE_PLACEMENT:0>, <AQ_HA_NOTIFICATION:0>, <CARDINALITY:1>, <CLB_GOAL:LONG>, <COMMIT_OUTCOME:0>, <CSS_CRITICAL:no>, <DRAIN_TIMEOUT:>, <DTP:0>, <EDITION:>, <FAILOVER_METHOD:>, <FAILOVER_RESTORE:NONE>, <FAILOVER_RETRIES:>, <FAILOVER_TYPE:>, <GLOBAL:false>, <GSM_FLAGS:0>, <HUB_SERVICE:>, <MANAGEMENT_POLICY:AUTOMATIC>, <MAX_LAG_TIME:ANY>, <PLUGGABLE_DATABASE:>, <REPLAY_INITIATION_TIME:300>, <RETENTION:86400>, <RLB_GOAL:NONE>, <ROLE:PRIMARY>, <SERVER_POOLS:>, <SERVICE_NAME_PQ:>, <SERVICE_TYPE:MAIN>, <SESSION_STATE_CONSISTENCY:DYNAMIC>, <SQL_TRANSLATION_PROFILE:>, <STOP_OPTION:>, <TABLE_FAMILY_ID:>, <TAF_FAILOVER_DELAY:>, <TAF_POLICY:NONE>, <USR_ORA_DISCONNECT:false>]
[main] [ 2019-05-22 11:17:58.990 EDT ] [ServiceArgs.setServiceType:230] set serviceType to MAIN
[main] [ 2019-05-22 11:17:58.990 EDT ] [ServiceArgs.setServiceType:230] set serviceType to MAIN
[main] [ 2019-05-22 11:17:58.990 EDT ] [CRSCache.getAttributesFromCRS:155] CRS: name: ora.<db_name>.<service_name>.svc, type 1, node: null
[main] [ 2019-05-22 11:17:58.990 EDT ] [CRSCache.getAttributesFromCRS:156] attrs: [SERVER_POOLS]
[main] [ 2019-05-22 11:17:59.007 EDT ] [CRSCache.getAttributesFromCRS:163] CRS: [<SERVER_POOLS:>]
[main] [ 2019-05-22 11:17:59.007 EDT ] [ServiceImpl.getServiceCardinality:3425] value of SERVER_POOLS attr :
[main] [ 2019-05-22 11:17:59.007 EDT ] [CRSCache.getAttributesFromCRS:155] CRS: name: ora.<db_name>.<service_name>.svc, type 1, node: null
[main] [ 2019-05-22 11:17:59.007 EDT ] [CRSCache.getAttributesFromCRS:156] attrs: [CARDINALITY]
[main] [ 2019-05-22 11:17:59.027 EDT ] [CRSCache.getAttributesFromCRS:163] CRS: [<CARDINALITY:1>]
[main] [ 2019-05-22 11:17:59.027 EDT ] [ServiceImpl.getServiceCardinality:3435] value of CARDINALITY attr : 1
[main] [ 2019-05-22 11:17:59.027 EDT ] [ServiceImpl.getServiceCardinality:3462] this is a SIHA service
[main] [ 2019-05-22 11:17:59.029 EDT ] [CRSCache.getAttributesFromCache:229] CRS cache: ora.<db_name>.db [<DATABASE_TYPE:SINGLE>]
[main] [ 2019-05-22 11:17:59.029 EDT ] [CRSCache.getAttributesFromCRS:155] CRS: name: ora.<db_name>.db, type 1, node: null
[main] [ 2019-05-22 11:17:59.029 EDT ] [CRSCache.getAttributesFromCRS:156] attrs: [HOSTING_MEMBERS]
[main] [ 2019-05-22 11:17:59.046 EDT ] [CRSCache.getAttributesFromCRS:163] CRS: [<HOSTING_MEMBERS:>]
[main] [ 2019-05-22 11:17:59.046 EDT ] [CRSCache.getAttributesFromCRS:155] CRS: name: ora.<db_name>.db, type 1, node: null
[main] [ 2019-05-22 11:17:59.046 EDT ] [CRSCache.getAttributesFromCRS:156] attrs: [SERVER_POOLS]
[main] [ 2019-05-22 11:17:59.068 EDT ] [CRSCache.getAttributesFromCRS:163] CRS: [<SERVER_POOLS:>]
Exception in thread "main"
java.lang.NullPointerException
at oracle.ops.opsctl.StatusAction.internalExecuteService(StatusAction.java:2038)
at oracle.ops.opsctl.StatusAction.executeSIHAService(StatusAction.java:1652)
at oracle.ops.opsctl.Action.executeSIHA(Action.java:443)
at oracle.ops.opsctl.OPSCTLDriver.execute(OPSCTLDriver.java:537)
at oracle.ops.opsctl.OPSCTLDriver.main(OPSCTLDriver.java:252)
[Thread-1] [ 2019-05-22 11:17:59.069 EDT ] [InnerInterruptHandler.run:116] Running the shutdown hook
[Thread-1] [ 2019-05-22 11:17:59.069 EDT ] [InnerInterruptHandler.run:120] Calling Interrupt handler....ctrlCHandler
[Thread-1] [ 2019-05-22 11:17:59.069 EDT ] [CommandLineParser.<init>:506] Is this a cluster? : false
[Thread-1] [ 2019-05-22 11:17:59.070 EDT ] [OPSCTLDriver.ctrlCHandler:306] Stopped srvctl execution
[Thread-1] [ 2019-05-22 11:17:59.070 EDT ] [OPSCTLDriver.ctrlCHandler:307] Invoking interrupt handler
[Thread-1] [ 2019-05-22 11:17:59.070 EDT ] [CmdOptVals.isOptionSet:1076] Calling isOptionSet for verbose
[Thread-1] [ 2019-05-22 11:17:59.070 EDT ] [OptVal.isSet:155] m_value is null
[Thread-1] [ 2019-05-22 11:17:59.070 EDT ] [SRVCTLHandler.getMethodName:122] getMethodName: Method Name = status_service_Handler
[Thread-1] [ 2019-05-22 11:17:59.070 EDT ] [SRVCTLHandler.invokeCtrlCHandler:230] Interrupt handler method status_service_Handler
[Thread-1] [ 2019-05-22 11:17:59.070 EDT ] [SRVCTLHandler.invokeCtrlCHandler:231] Interrupt handler class oracle.ops.opsctl.StatusAction
[Thread-1] [ 2019-05-22 11:17:59.071 EDT ] [SRVCTLHandler.invokeCtrlCHandler:244] oracle.ops.opsctl.StatusAction.status_service_Handler()
java.lang.Class.getMethod(Class.java:1786)
oracle.ops.opsctl.SRVCTLHandler.invokeCtrlCHandler(SRVCTLHandler.java:234)
oracle.ops.opsctl.OPSCTLDriver.ctrlCHandler(OPSCTLDriver.java:308)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
oracle.cluster.common.InnerInterruptHandler.run(InterruptHandler.java:123)
[Thread-1] [ 2019-05-22 11:17:59.086 EDT ] [OPSCTLDriver.ctrlCHandler:311] PRCG-1036 : Internal error.
oracle.ops.opsctl.SRVCTLHandler.invokeCtrlCHandler(SRVCTLHandler.java:245)
oracle.ops.opsctl.OPSCTLDriver.ctrlCHandler(OPSCTLDriver.java:308)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
oracle.cluster.common.InnerInterruptHandler.run(InterruptHandler.java:123)

Solution

As workaround,

srvctl status service -d <dbname> -s <service_name>

Bugs 29839229&31414282 fixed in a 20.1 version, request/apply patches for your platform/version