Spring Boot 2.x - commit and rollback transaction manually

In this short article, we would like to show how to commit and rollback transactions manually in Spring Boot in Java.

Quick solution:

1. access transaction manager with @Autowired annotation,
2. create transaction with getTransation() method,
3. commit on success with commit() method,
4. rollback on faliture with rollback() method.

Practical  example:

package com.example;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.interceptor.DefaultTransactionAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class ExampleController {

    @Autowired
    private PlatformTransactionManager transactionManager;

    @RequestMapping("/path/to/api")
    @ResponseBody
    public String executeSomeApi() {
        TransactionStatus transaction = this.transactionManager.getTransaction(null);
        try {
            // some code here ...

            this.transactionManager.commit(transaction);
            return "Success!";
        } catch (Throwable ex) {
            this.transactionManager.rollback(transaction);
            return "Error!";
        }
    }
}

More complicated example

In this section, the presented example shows how to rollback transactions on fail in different cases.

package com.example;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.interceptor.DefaultTransactionAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class ExampleController {

    @Autowired
    private PlatformTransactionManager transactionManager;

    @RequestMapping(
            value = "/path/to/api",
            method = RequestMethod.GET,
            produces = MediaType.TEXT_PLAIN_VALUE
    )
    @ResponseBody
    public String executeSomeApi() {
        TransactionStatus transaction = this.transactionManager.getTransaction(null);
        try {
            // some code here ...

            // if (operationError) {
            //     this.transactionManager.rollback(transaction);
            //     return "Error!";
            // }

            // some code here ...

            this.transactionManager.commit(transaction);
            return "Success!";
        } catch (Throwable ex) {
            this.transactionManager.rollback(transaction);
            return "Error!";
        }
    }
}

See also

1. Spring Boot 2.x - transaction with controller request