org.h2.message.DbException: General error: "java.util.ConcurrentModificationException" [50000-187]

[Faraz Rizvi]

Hi,

I am running H2 in PostgresSQL mode as follows: 

jdbc:h2:~/logs/trades/20160825/allocations-data/allocserver;MODE=PostgreSQL;AUTO_SERVER=TRUE;MVCC=TRUE;CACHE_SIZE=65536;CACHE_TYPE=SOFT_LRU

The embedded H2 runs fine but then all of a sudden fails with the following exception in trace.db. I cannot find any information on the internet. Can anyone please help?

08-24 21:18:01 database: flush

org.h2.message.DbException: General error: "java.util.ConcurrentModificationException" [50000-187]

        at org.h2.message.DbException.get(DbException.java:168)

        at org.h2.message.DbException.convert(DbException.java:295)

        at org.h2.mvstore.db.MVTableEngine$1.uncaughtException(MVTableEngine.java:93)

        at org.h2.mvstore.MVStore.writeInBackground(MVStore.java:2397)

        at org.h2.mvstore.MVStore$BackgroundWriterThread.run(MVStore.java:2583)

Caused by: org.h2.jdbc.JdbcSQLException: General error: "java.util.ConcurrentModificationException" [50000-187]

        at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)

        ... 5 more

Caused by: java.util.ConcurrentModificationException

        at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)

        at java.util.HashMap$ValueIterator.next(HashMap.java:1458)

        at org.h2.mvstore.MVStore.applyFreedSpace(MVStore.java:1376)

        at org.h2.mvstore.MVStore.storeNowTry(MVStore.java:1042)

        at org.h2.mvstore.MVStore.storeNow(MVStore.java:973)

        at org.h2.mvstore.MVStore.commitAndSave(MVStore.java:962)

        at org.h2.mvstore.MVStore.compactRewrite(MVStore.java:1817)

        at org.h2.mvstore.MVStore.compact(MVStore.java:1701)

        at org.h2.mvstore.MVStore.writeInBackground(MVStore.java:2393)

        ... 1 more

08-24 21:18:04 jdbc[3]: exception

org.h2.jdbc.JdbcSQLException: The database has been closed [90098-187]

        at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)

        at org.h2.message.DbException.get(DbException.java:179)

        at org.h2.message.DbException.get(DbException.java:155)

        at org.h2.message.DbException.get(DbException.java:144)

        at org.h2.engine.Session.getTransaction(Session.java:1451)

        at org.h2.engine.Session.getStatementSavepoint(Session.java:1461)

        at org.h2.engine.Session.setSavepoint(Session.java:690)

        at org.h2.command.Command.executeUpdate(Command.java:248)

        at org.h2.jdbc.JdbcPreparedStatement.execute(JdbcPreparedStatement.java:198)

        at flextrade.flexfixj.warehouse.impl.statements.UpdateSessionStatement.execute(UpdateSessionStatement.java:45)

        at flextrade.flexfixj.persistence.AsynchronousPersisterImpl.executeStatement(AsynchronousPersisterImpl.java:46)

        at flextrade.flexfixj.persistence.AsynchronousPersisterImpl.enqueueStatement(AsynchronousPersisterImpl.java:37)

        at flextrade.flexfixj.warehouse.impl.JdbcWarehouse.updateSession(JdbcWarehouse.java:227)

        at flextrade.flexfixj.warehouse.impl.JdbcWarehouse.incrNextTargetMsgSeqNum(JdbcWarehouse.java:588)

        at quickfix.SessionState.incrNextTargetMsgSeqNum(SessionState.java:370)

        at quickfix.Session.nextHeartBeat(Session.java:1602)

        at quickfix.Session.next(Session.java:1002)

        at quickfix.ThrottleableThreadPerSessionEventHandlingStrategy$MessageDispatchConsumer.run(ThrottleableThreadPerSessionEventHandlingStrategy.java:151)

        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:745)

08-24 21:18:04 jdbc[3]: exception

[Faraz Rizvi]

Any one facing the same issue? I turned off MVCC and yet was hit by this today.

[Noel Grandin]

Try updating to the latest version​