H2db transaction problem

I open need to use h2db but it is not so compatible and stable
Today I got trouble with h2db . The db is good without other bad transaction
However that do not transaction with delete and update !
Why does this critical problem happen to me ? Wtf
I had more inspect this status !
But nothing problem with db . I think more and more and more investigate
I keep going face at this problems I suddenly had one possible thinking
This should not db lock ! Select is good and update or delete often success
But transaction always return to previous state as rollback
Through Totally this situation i investigate
I suggest that this problems is concurrent transaction problem
My suggest turnout good opportunity !
Another periodical transaction process stopped and then
Delete or update is run very well without any problem
Wow stupid man ! Civilization software profit make stupid man
I should often study open db transaction and security and configure