I test http session persistence to db with latest WildFly application 
server (Beta2-SNAPSHOT, h2 1.3.173). I have two nodes running in my test, 
where failover is tested and I use this connection url - 
"jdbc:h2:file;AUTO_SERVER=true". I need to use file storing, because of 
server shutdown failover. Occassionally I am facing following exception:

Unique index or primary key violation: "PRIMARY_KEY_A ON 
>> PUBLIC.""binarybased_default_host_session_db_cluster""(ID)"; SQL statement:
>
> INSERT INTO "binarybased_default_host_session_db_cluster" (datum, version, 
>> id) VALUES(?,?,?) [23505-159]
>
> at org.h2.message.DbException.getJdbcSQLException(DbException.java:329)
>
> at org.h2.message.DbException.get(DbException.java:169)
>
> at org.h2.message.DbException.get(DbException.java:146)
>
> at org.h2.index.BaseIndex.getDuplicateKeyException(BaseIndex.java:81)
>
> at org.h2.index.PageBtree.find(PageBtree.java:121)
>
> at org.h2.index.PageBtreeLeaf.addRow(PageBtreeLeaf.java:146)
>
> at org.h2.index.PageBtreeLeaf.addRowTry(PageBtreeLeaf.java:100)
>
> at org.h2.index.PageBtreeIndex.addRow(PageBtreeIndex.java:105)
>
> at org.h2.index.PageBtreeIndex.add(PageBtreeIndex.java:96)
>
> at org.h2.table.RegularTable.addRow(RegularTable.java:130)
>
> at org.h2.command.dml.Insert.insertRows(Insert.java:124)
>
> at org.h2.command.dml.Insert.update(Insert.java:84)
>
> at org.h2.command.CommandContainer.update(CommandContainer.java:71)
>
> at org.h2.command.Command.executeUpdate(Command.java:212)
>
> at 
>> org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:143)
>
> at 
>> org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:129)
>
>
You can see full stack trace (slightly different) at 
https://issues.jboss.org/browse/WFLY-2409. I am not really sure, what 
 could be the problem. I'll appreciate any suggestions. 

Thank's in advance.
Tom 

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