"ERROR CommandContext:122 - Error while closing command context" on postgres database 9.6

[dattatray_ashte]

I am using activiti version 6. Its working fine with mysql database but when i am trying it with postgres database getting below error. Please note process configuration i configured tasks as asynchronous.

2017-09-08 14:54:52 [activiti-async-job-executor-thread-35] ERROR CommandContext:122 - Error while closing command context
java.lang.NullPointerException
at org.activiti.engine.impl.persistence.entity.JobEntityManagerImpl.delete(JobEntityManagerImpl.java:151)
at org.activiti.engine.impl.persistence.entity.JobEntityManagerImpl.delete(JobEntityManagerImpl.java:35)
at org.activiti.engine.impl.persistence.entity.AbstractEntityManager.delete(AbstractEntityManager.java:87)
at org.activiti.engine.impl.persistence.entity.JobEntityManagerImpl.delete(JobEntityManagerImpl.java:137)
at org.activiti.engine.impl.persistence.entity.JobEntityManagerImpl.delete(JobEntityManagerImpl.java:35)
at org.activiti.engine.impl.persistence.entity.AbstractEntityManager.delete(AbstractEntityManager.java:82)
at org.activiti.engine.impl.asyncexecutor.DefaultJobManager.unacquire(DefaultJobManager.java:230)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable$3.execute(ExecuteAsyncRunnable.java:169)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable$3.execute(ExecuteAsyncRunnable.java:167)
at org.activiti.engine.impl.interceptor.CommandInvoker$1.run(CommandInvoker.java:37)
at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:78)
at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:57)
at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:42)
at org.activiti.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:48)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:63)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.unacquireJob(ExecuteAsyncRunnable.java:167)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.lockJobIfNeeded(ExecuteAsyncRunnable.java:154)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:72)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)

[bassam_al-saror]

Can you provide information on what you are trying to do or maybe provide steps to reproduce the error.

[lovik]

Hi,

I get the same error when all the service tasks(few are rest calls and hence some wait involved) are async and there are multiple continuous hits to the same process. I am still stuck with this issue. Would appreciate any help.