CorDapp Development and Lifecycle BDC Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   What is the primary artifact produced when building a CorDapp for deployment?

   • AA JAR file
   • BAn EXE file
   • CAn APK file
   • DA WAR file
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2. 12application · medium

   A developer is setting up a new CorDapp project. They want to separate the contract and workflow code into different modules so that the contract module can be used by other CorDapps. What is the recommended project structure?

   • AA single module with separate packages for contracts and flows.
   • BA single module containing both contracts and flows, with a single build.gradle file.
   • CTwo modules: 'states' and 'flows', where the flows module depends on the states module.
   • DTwo modules: 'contracts' and 'workflows', where the workflows module depends on the contracts module.
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4. 13expert · hard

   A CorDapp has been in production for six months. The team needs to add a new command to an existing contract. The new command will be used in new transactions, but old transactions must remain valid. The team wants to minimize downtime and avoid a hard fork. What is the best approach?

   • AModify the existing contract class to allow the new command and redeploy the JAR to all nodes.
   • BUse the network's built-in 'upgradeContract' API to update the contract without changing the JAR.
   • CDeploy a new version of the CorDapp JAR to all nodes simultaneously, then use a contract upgrade transaction to migrate existing states.
   • DCreate a new CorDapp with a new contract and deploy it alongside the old one, using a flow to migrate states.
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5. 14application · medium

   A developer is designing a state for a loyalty points system. The state should be fungible and allow points to be split and merged. Which type of state should be used?

   • AA LinearState with a unique linearId for each points balance.
   • BA ContractState with a list of participants and a balance field.
   • CA FungibleState with an amount and a holder, where the amount can be split and merged.
   • DA OwnableState with a single owner and an amount.
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6. 15foundation · easy

   In a Corda contract class, which method contains the validation logic for transactions?

   • Aexecute()
   • Bcheck()
   • Cvalidate()
   • Dverify()
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