[jira] [Created] (LOG4J2-449) JDBCDatabaseManager not closing timed-out connection

["Dimitry Declercq (JIRA)" <ji...@apache.org>]

Dimitry Declercq created LOG4J2-449:
---------------------------------------

             Summary: JDBCDatabaseManager not closing timed-out connection
                 Key: LOG4J2-449
                 URL: https://issues.apache.org/jira/browse/LOG4J2-449
             Project: Log4j 2
          Issue Type: Bug
          Components: Appenders
    Affects Versions: 2.0-beta9
            Reporter: Dimitry Declercq


Using the config below we receive following error when writing to DB after a few days of inactivity. 

Assume 2 Applications and a configured connection pool (BoneCP 30m idle timeout, mysql wait_timeout=8h) accessed by 'jdbc/logging'
- App 1 logs frequently (every 5 minutes)
- App 2 logs only errors (1-2 a week)

App 1 works fine, no errors, logs are written to database
App 2 shows trouble when logging errors more than 1 day after deploy

Error:
{code}
ERROR Unable to write to database [jdbcManager{ description=databaseAppender, bufferSize=0, connectionSource=dataSource{ name=java:/comp/env/jdbc/logging, value=JDBC URL = jdbc:mysql://host1,host2/logging?failOverReadOnly=false&amp;secondsBeforeRetryMaster=60, Username = <<removed>>, partitions = 1, max (per partition) = 10, min (per partition) = 2, idle max age = 30 min, idle test period = 5 min, strategy = DEFAULT }, tableName=application_log, columns=[ { name=host, layout=acc-appserver-1, literal=null, timestamp=false }, { name=context, layout=/websocket, literal=null, timestamp=false }, { name=eventDate, layout=null, literal=null, timestamp=true }, { name=level, layout=%level, literal=null, timestamp=false }, { name=class, layout=%c, literal=null, timestamp=false }, { name=message, layout=%message, literal=null, timestamp=false }, { name=exception, layout=%ex{full}, literal=null, timestamp=false } ] }] for appender [databaseAppender]. java.lang.reflect.UndeclaredThrowableException
        at com.sun.proxy.$Proxy33.setNString(Unknown Source)
        at com.jolbox.bonecp.PreparedStatementHandle.setNString(PreparedStatementHandle.java:472)
        at org.apache.logging.log4j.core.appender.db.jdbc.JDBCDatabaseManager.writeInternal(JDBCDatabaseManager.java:93)
        at org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager.write(AbstractDatabaseManager.java:136)
        at org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender.append(AbstractDatabaseAppender.java:103)
        at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:99)
        at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:425)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:409)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:367)
        at org.apache.logging.log4j.core.Logger.log(Logger.java:110)
        at org.apache.logging.log4j.spi.AbstractLoggerWrapper.log(AbstractLoggerWrapper.java:55)
        at org.slf4j.impl.SLF4JLogger.warn(SLF4JLogger.java:333)
        at com.lynx.websocket.gateway.GatewayMessageProcessor.handleMessage(GatewayMessageProcessor.java:34)
        at com.lynx.websocket.queue.WebSocketConsumer.handleMessage(WebSocketConsumer.java:47)
        at com.lynx.queue.consumer.QueueConsumer.handleDelivery(QueueConsumer.java:75)
        at com.rabbitmq.client.impl.ConsumerDispatcher$4.run(ConsumerDispatcher.java:121)
        at com.rabbitmq.client.impl.ConsumerWorkService$WorkPoolRunnable.run(ConsumerWorkService.java:76)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at com.jolbox.bonecp.MemorizeTransactionProxy.invoke(MemorizeTransactionProxy.java:233)
        ... 21 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after statement closed.
        at sun.reflect.GeneratedConstructorAccessor292.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.Util.getInstance(Util.java:386)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
        at com.mysql.jdbc.StatementImpl.checkClosed(StatementImpl.java:461)
        at com.mysql.jdbc.PreparedStatement.setNString(PreparedStatement.java:5316)
        ... 25 more
{code}

Config:
{code}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
    <Properties>
        <Property name="applicationName">${web:contextPath}</Property>
        <Property name="host">${web:hostName}</Property>
    </Properties>
    <Appenders>
       <JDBC name="databaseAppender" tableName="logging_table">
            <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
            <DataSource jndiName="java:/comp/env/jdbc/logging"/>
            <Column name="host" pattern="${host}"/>
            <Column name="context" pattern="${applicationName}"/>
            <Column name="eventDate" isEventTimestamp="true"/>
            <Column name="level" pattern="%level"/>
            <Column name="class" pattern="%c"/>
            <Column name="message" pattern="%message"/>
            <Column name="exception" pattern="%ex{full}"/>
        </JDBC>
    </Appenders>
    <Loggers>
        <Logger name="com.lynx" level="TRACE"/>
        <Root level="WARN">
            <AppenderRef ref="applicationLog"/>
            <AppenderRef ref="databaseAppender"/>
        </Root>
    </Loggers>
</Configuration>
{code}

After a quick look at the code I think the connection is retrieved and opened upon application start. Would there be a possibility to either retrieves connections from the pool when the actual on log event occurs or to reconnect in case of connection problems?



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