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Java deadlock5/10/2023 ![]() In the JDBC end you will receive a specific SQLException for that. This way you don't need to execute those queries in a transaction.įurther, some databases like PostgreSQL and Oracle can autodetect deadlocks and will automatically rollback one of the transactions, usually the one which was initiated later. When mixing is -at first sight- mandatory, then you should at least try to rewrite it into a single/nested statement. To avoid deadlocks, rule #1 is avoiding mixing SELECT with INSERT/UPDATE/DELETE statements in a single transaction. Once you set the Connection#setAutoCommit() to false (or configure it to be by default), then the transaction will start and it will finish when you call Connection#commit(). We should avoid this condition as much as we can. Deadlock condition can break our code at run time and can destroy business logic. Deadlock condition is a complex condition which occurs only in case of multiple threads. I am not sure how JDBCTemplate manages the transactions, but a JDBC connection is by default not transactional. If threads are waiting for each other to finish, then the condition is known as Deadlock. If the other transaction isn't finished while the query is been executed, then the other transaction won't be able to finish its own query. there are two simultaneous row-locking transactions with each multiple queries whose results depends on the other transaction. You usually only risk a deadlock when there's means of a chicken-egg issue. This is to be managed at transaction level.
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