org.flowable.common.engine.api.FlowableException: Programmatic error: null job passed

Flowable Engine
1

while running Flowable engine it give me

org.flowable.common.engine.api.FlowableException: Programmatic error: null job passed
at org.flowable.job.service.impl.asyncexecutor.DefaultJobManager.unacquire(DefaultJobManager.java:278) ~[flowable-job-service-6.4.2.jar:6.4.2]
at org.flowable.job.service.impl.asyncexecutor.ResetExpiredJobsCmd.execute(ResetExpiredJobsCmd.java:40) ~[flowable-job-service-6.4.2.jar:6.4.2]
at org.flowable.job.service.impl.asyncexecutor.ResetExpiredJobsCmd.execute(ResetExpiredJobsCmd.java:26) ~[flowable-job-service-6.4.2.jar:6.4.2]
at org.flowable.engine.impl.interceptor.CommandInvoker$1.run(CommandInvoker.java:51) ~[flowable-engine-6.4.2.jar:6.4.2]
at org.flowable.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:93) ~[flowable-engine-6.4.2.jar:6.4.2]
at org.flowable.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:72) ~[flowable-engine-6.4.2.jar:6.4.2]
at org.flowable.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:56) ~[flowable-engine-6.4.2.jar:6.4.2]
at org.flowable.engine.impl.interceptor.BpmnOverrideContextInterceptor.execute(BpmnOverrideContextInterceptor.java:25) ~[flowable-engine-6.4.2.jar:6.4.2]
at org.flowable.common.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:53) ~[flowable-engine-common-6.4.2.jar:6.4.2]
at org.flowable.common.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:72) ~[flowable-engine-common-6.4.2.jar:6.4.2]
at org.flowable.common.spring.SpringTransactionInterceptor.lambda$execute$0(SpringTransactionInterceptor.java:56) ~[flowable-spring-common-6.4.2.jar:6.4.2]
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) ~[spring-tx-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.flowable.common.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:56) ~[flowable-spring-common-6.4.2.jar:6.4.2]
at org.flowable.common.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30) ~[flowable-engine-common-6.4.2.jar:6.4.2]
at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:56) ~[flowable-engine-common-6.4.2.jar:6.4.2]
at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:51) ~[flowable-engine-common-6.4.2.jar:6.4.2]
at org.flowable.job.service.impl.asyncexecutor.ResetExpiredJobsRunnable.resetJobs(ResetExpiredJobsRunnable.java:102) [flowable-job-service-6.4.2.jar:6.4.2]
at org.flowable.job.service.impl.asyncexecutor.ResetExpiredJobsRunnable.run(ResetExpiredJobsRunnable.java:62) [flowable-job-service-6.4.2.jar:6.4.2]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_242]

2

This most likely means the job was deleted (e.g. because it was actually executed) just before the reset thread deemed it resettable. This is very unlikely to happen (and has no impact), though, but added a null check in https://github.com/flowable/flowable-engine/commit/2b08f3a3b096258a814409af5c3335c984e28387 to avoid this logging.