• In Jakarta EE8 environments, such as Helidon 2.x, use the TmmLib file.

  <dependency>
       <groupId>com.oracle.tmm.jta</groupId>
       <artifactId>TmmLib</artifactId>
       <version>24.4</version>
  </dependency>

• In Jakarta EE9 environments, such as Helidon 3.x applications, use the TmmLib-jakarta file.

  <dependency>
       <groupId>com.oracle.tmm.jta</groupId>
       <artifactId>TmmLib-jakarta</artifactId>
       <version>24.4</version>
  </dependency>

import oracle.tmm.tcc.TccClientService;
import oracle.tmm.tcc.TccParticipantStatus;
import oracle.tmm.tcc.TccParticipantStatus;
import oracle.tmm.tcc.exception.TccException;
import oracle.tmm.tcc.exception.TccHeuristicException;
import oracle.tmm.tcc.exception.TccUnknownTransactionException;
import oracle.tmm.tcc.vo.CancelResponse;
import oracle.tmm.tcc.vo.ConfirmResponse;
import oracle.tmm.tcc.vo.TccParticipant;

Use the following code to initiate a new TCC transaction when a call is made to the transaction initiator service. In the following example, the class myTransactionInitiatorApp contains the code that initiates the service. Replace the name of the class based on your environment.

@TCC(timeLimit = 120, timeUnit = ChronoUnit.SECONDS)  //Add @TCC annotation before the initiator application resource class to start a TCC transaction
public class myTransactionInitiatorApp {
    // Service code that is specific to the transaction initiator service.
}

You can specify the following optional parameters with the @TCC annotation.

• timeLimit: Specify the time period, as a whole number, for which you want the transaction initiator service to reserve the resources. It is the responsibility of the application developer to provide the required code to release the resources and cancel the their part of the TCC transaction after the time limit expires. Decide the time limit based on your business requirement.
• timeUnit: Specify the unit in which you have mentioned the time limit, such asChronoUnit.SECONDS and ChronoUnit.MINUTES. Permissible values are all the enum values from the java.time.temporal.ChronoUnit class. See https://docs.oracle.com/javase/8/docs/api/java/time/temporal/ChronoUnit.html.