Yes, that's quite strange.
Can it be a thread safety issue? Field org.h2.engine.Session#closed is not
volatile and access to it is not synchronized. Can it happen so that one
thread closes a session but after that another thread adds a lock?
Are you sure there were no previous exceptions logged which indicate why it
> closed this way?
>
I do not see any other exceptions.
There are a bunch of such exceptions in log:
W 160326 193447.825 [Resource Destroyer in BasicResourcePool.close()]
BasicResourcePool - Failed to destroy resource: com.mchange.v2.c3p0.impl.
NewPooledConnection@2c6f911c
java.sql.SQLException: Some resources failed to close properly while
closing com.mchange.v2.c3p0.impl.NewPooledConnection@2c6f911c
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(
NewPooledConnection.java:664)
at com.mchange.v2.c3p0.impl.NewPooledConnection.closeMaybeCheckedOut(
NewPooledConnection.java:255)
at com.mchange.v2.c3p0.impl.
C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.
destroyResource(C3P0PooledConnectionPool.java:621)
at com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask.
run(BasicResourcePool.java:1065)
at com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(
BasicResourcePool.java:1090)
at com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(
BasicResourcePool.java:1051)
at com.mchange.v2.resourcepool.BasicResourcePool.access$100(
BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$5.run(
BasicResourcePool.java:1305)
When I debug their cause I can see that it is caused by:
org.h2.jdbc.JdbcSQLException: Timeout trying to lock table "SYS" [50200-191]
As I understand, it is caused by the DbException which I have mentioned in
the previous message.
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