🍃🎓 SPRING CERTIFICATION QUESTION: What is the default rollback policy? How can you override it?

‍🏫 Answer:

The default rollback policy is defined by DefaultTransactionAttribute

which states that rollback should be performed only ‼️ in case of RuntimeException and Error ❌ but not on checked exceptions.

This default behavior can be overridden using (in case a declarative approach is used):

- Transactional#noRollbackFor()

- Transactional#noRollbackForClassName()

- Transactional#rollbackFor()

- Transactional#rollbackForClassName()

annotation attributes.

#spring #certificationquestion #vcp

Transaction Rollback 👉 https://lnkd.in/gbTBtG6W

The @Transactional annotation is the metadata that specifies the semantics of the transactions on a method.

We have two ways to roll back a transaction: declarative and programmatic.

In the declarative approach, we annotate the methods with the @Transactional annotation.

The @Transactional annotation makes use of the attributes rollbackFor or rollbackForClassName to rollback the transactions,

and the attributes noRollbackFor or noRollbackForClassName to avoid rollback on listed exceptions.

The default rollback behavior in the declarative approach will roll back ↩️on runtime exceptions.

1️⃣ Let's see a simple example using the declarative approach to rollback a transaction for runtime exceptions or errors:

@𝐓𝐫𝐚𝐧𝐬𝐚𝐜𝐭𝐢𝐨𝐧𝐚𝐥

𝐩𝐮𝐛𝐥𝐢𝐜 𝐯𝐨𝐢𝐝 𝐜𝐫𝐞𝐚𝐭𝐞𝐂𝐨𝐮𝐫𝐬𝐞𝐃𝐞𝐜𝐥𝐚𝐫𝐚𝐭𝐢𝐯𝐞𝐖𝐢𝐭𝐡𝐑𝐮𝐧𝐭𝐢𝐦𝐞𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧(𝐂𝐨𝐮𝐫𝐬𝐞 𝐜𝐨𝐮𝐫𝐬𝐞) {

𝐜𝐨𝐮𝐫𝐬𝐞𝐃𝐚𝐨.𝐜𝐫𝐞𝐚𝐭𝐞(𝐜𝐨𝐮𝐫𝐬𝐞);

𝐭𝐡𝐫𝐨𝐰 𝐧𝐞𝐰 𝐃𝐚𝐭𝐚𝐈𝐧𝐭𝐞𝐠𝐫𝐢𝐭𝐲𝐕𝐢𝐨𝐥𝐚𝐭𝐢𝐨𝐧𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧("𝐓𝐡𝐫𝐨𝐰𝐢𝐧𝐠 𝐞𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧 𝐟𝐨𝐫 𝐝𝐞𝐦𝐨𝐢𝐧𝐠 𝐑𝐨𝐥𝐥𝐛𝐚𝐜𝐤!!!");

}

2️⃣ Next, we'll use the declarative approach to roll back a transaction for the listed checked exceptions.

The rollback e is on SQLException:

@𝐓𝐫𝐚𝐧𝐬𝐚𝐜𝐭𝐢𝐨𝐧𝐚𝐥(𝐫𝐨𝐥𝐥𝐛𝐚𝐜𝐤𝐅𝐨𝐫 = { 𝐒𝐐𝐋𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧.𝐜𝐥𝐚𝐬𝐬 })

𝐩𝐮𝐛𝐥𝐢𝐜 𝐯𝐨𝐢𝐝 𝐜𝐫𝐞𝐚𝐭𝐞𝐂𝐨𝐮𝐫𝐬𝐞𝐃𝐞𝐜𝐥𝐚𝐫𝐚𝐭𝐢𝐯𝐞𝐖𝐢𝐭𝐡𝐂𝐡𝐞𝐜𝐤𝐞𝐝𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧(𝐂𝐨𝐮𝐫𝐬𝐞 𝐜𝐨𝐮𝐫𝐬𝐞) 𝐭𝐡𝐫𝐨𝐰𝐬 𝐒𝐐𝐋𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧 {

𝐜𝐨𝐮𝐫𝐬𝐞𝐃𝐚𝐨.𝐜𝐫𝐞𝐚𝐭𝐞(𝐜𝐨𝐮𝐫𝐬𝐞);

𝐭𝐡𝐫𝐨𝐰 𝐧𝐞𝐰 𝐒𝐐𝐋𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧("𝐓𝐡𝐫𝐨𝐰𝐢𝐧𝐠 𝐞𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧 𝐟𝐨𝐫 𝐝𝐞𝐦𝐨𝐢𝐧𝐠 𝐫𝐨𝐥𝐥𝐛𝐚𝐜𝐤");

}

3️⃣ Let's see a simple use of attribute noRollbackFor in the declarative approach to prevent rollback of the transaction for the listed exception:

@𝐓𝐫𝐚𝐧𝐬𝐚𝐜𝐭𝐢𝐨𝐧𝐚𝐥(𝐧𝐨𝐑𝐨𝐥𝐥𝐛𝐚𝐜𝐤𝐅𝐨𝐫 = { 𝐒𝐐𝐋𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧.𝐜𝐥𝐚𝐬𝐬 })

𝐩𝐮𝐛𝐥𝐢𝐜 𝐯𝐨𝐢𝐝 𝐜𝐫𝐞𝐚𝐭𝐞𝐂𝐨𝐮𝐫𝐬𝐞𝐃𝐞𝐜𝐥𝐚𝐫𝐚𝐭𝐢𝐯𝐞𝐖𝐢𝐭𝐡𝐍𝐨𝐑𝐨𝐥𝐥𝐁𝐚𝐜𝐤(𝐂𝐨𝐮𝐫𝐬𝐞 𝐜𝐨𝐮𝐫𝐬𝐞) 𝐭𝐡𝐫𝐨𝐰𝐬 𝐒𝐐𝐋𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧 {

𝐜𝐨𝐮𝐫𝐬𝐞𝐃𝐚𝐨.𝐜𝐫𝐞𝐚𝐭𝐞(𝐜𝐨𝐮𝐫𝐬𝐞);

𝐭𝐡𝐫𝐨𝐰 𝐧𝐞𝐰 𝐒𝐐𝐋𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧("𝐓𝐡𝐫𝐨𝐰𝐢𝐧𝐠 𝐞𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧 𝐟𝐨𝐫 𝐝𝐞𝐦𝐨𝐢𝐧𝐠 𝐫𝐨𝐥𝐥𝐛𝐚𝐜𝐤");

}