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6.2. Configuring the Transaction Manager

Overview
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You can configure some basic parameters of the Aries transaction manager by editing the properties in the Aries transaction manager configuration file. In particular you must always specify the location of the HOWL log file directory and it is necessary to set the aries.transaction.recoverable property explicitly to true, if you want to enable the transaction recovery mechanism.

Configuration file
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To configure the Aries transaction manager, you can edit the properties in the following configuration file: 
EsbInstallDir/etc/org.apache.aries.transaction.cfg
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Transaction manager properties
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The properties that you can set in the org.apache.aries.transaction.cfg file include the following:
aries.transaction.timeout
Specifies the transaction timeout in seconds. Default is 600 (that is, 10 minutes).
aries.transaction.recoverable
A boolean variable that specifies whether or not the transaction manager is recoverable. Default is false.
aries.transaction.howl.bufferSize
Specifies the HOWL log buffer size in units of KB, where the value must be an integer in the range [1,32]. Default is 32.
aries.transaction.howl.logFileDir
(Required) Specifies the log directory location, which must be an absolute path. No default value.
aries.transaction.howl.logFileName
Specifies the name of the HOWL log file. Default is transaction.
aries.transaction.howl.logFileExt
Specifies the file extention for the HOWL log file. Default is log.
aries.transaction.howl.maxLogFiles
Specifies the maximum number of log files. Default is 2.

Sample settings
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The following example shows the default settings from the org.apache.aries.transaction.cfg configuration file: 
aries.transaction.timeout=600
aries.transaction.howl.logFileDir=${karaf.data}/txlog/
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