A TransactionManager can be declared via xml in the <tomee-home>/conf/tomee.xml file or in a WEB-INF/resources.xml file using a declaration like the following. All properties in the element body are optional.

<TransactionManager id="myTransactionManager" type="TransactionManager">
    adler32Checksum = true
    bufferSizeKb = 32
    checksumEnabled = true
    defaultTransactionTimeout = 10 minutes
    flushSleepTime = 50 Milliseconds
    logFileDir = txlog
    logFileExt = log
    logFileName = howl
    maxBlocksPerFile = -1
    maxBuffers = 0
    maxLogFiles = 2
    minBuffers = 4
    threadsWaitingForceThreshold = -1
    txRecovery = false
</TransactionManager>

Alternatively, a TransactionManager can be declared via properties in the <tomee-home>/conf/system.properties file or via Java VirtualMachine -D properties. The properties can also be used when embedding TomEE via the javax.ejb.embeddable.EJBContainer API or InitialContext

myTransactionManager = new://TransactionManager?type=TransactionManager
myTransactionManager.adler32Checksum = true
myTransactionManager.bufferSizeKb = 32
myTransactionManager.checksumEnabled = true
myTransactionManager.defaultTransactionTimeout = 10 minutes
myTransactionManager.flushSleepTime = 50 Milliseconds
myTransactionManager.logFileDir = txlog
myTransactionManager.logFileExt = log
myTransactionManager.logFileName = howl
myTransactionManager.maxBlocksPerFile = -1
myTransactionManager.maxBuffers = 0
myTransactionManager.maxLogFiles = 2
myTransactionManager.minBuffers = 4
myTransactionManager.threadsWaitingForceThreshold = -1
myTransactionManager.txRecovery = false

Properties and xml can be mixed. Properties will override the xml allowing for easy configuration change without the need for ${} style variable substitution. Properties are not case sensitive. If a property is specified that is not supported by the declared TransactionManager a warning will be logged. If a TransactionManager is needed by the application and one is not declared, TomEE will create one dynamically using default settings. Multiple TransactionManager declarations are allowed.

Supported Properties