Close Activiti ProcessEngine when server shuts down

[labkey-tchad]

Rationale

When a deployApp triggers a server refresh, the WorkflowManager._processEngine can be left initialized with an invalid data source. This causes activiti to flood the server log with errors:

ERROR AcquireTimerJobsRunnable 2024-10-16T13:42:31,420                Thread-39 : exception during timer job acquisition: org/apache/ibatis/exceptions/ExceptionFactory
java.lang.NoClassDefFoundError: org/apache/ibatis/exceptions/ExceptionFactory
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:156) ~[mybatis-3.5.13.jar:3.5.13]
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147) ~[mybatis-3.5.13.jar:3.5.13]
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:142) ~[mybatis-3.5.13.jar:3.5.13]
	at org.activiti.engine.impl.db.DbSqlSession.selectListWithRawParameter(DbSqlSession.java:443) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.db.DbSqlSession.selectList(DbSqlSession.java:434) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.db.DbSqlSession.selectList(DbSqlSession.java:429) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.db.DbSqlSession.selectList(DbSqlSession.java:412) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.persistence.entity.JobEntityManager.findNextTimerJobsToExecute(JobEntityManager.java:157) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.cmd.AcquireTimerJobsCmd.execute(AcquireTimerJobsCmd.java:45) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.cmd.AcquireTimerJobsCmd.execute(AcquireTimerJobsCmd.java:29) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:24) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:57) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:31) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:40) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:35) ~[activiti-engine-5.20.0.jar:5.20.0]
	at org.activiti.engine.impl.asyncexecutor.AcquireTimerJobsRunnable.run(AcquireTimerJobsRunnable.java:52) [activiti-engine-5.20.0.jar:5.20.0]
	at java.base/java.lang.Thread.run(Thread.java:840) [?:?]
Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [org.apache.ibatis.exceptions.ExceptionFactory]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
	... 17 more

Related Pull Requests

• N/A

Changes

• Add a ShutdownListener to clean up WorkflowManager._processEngine

[labkey-susanh]

Thank you for tracking down a way out of this bad state.