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I use bitcoind's Wallet feature to manage my bitcoins.
Using json-rpc interface, how can I check that a transaction is a conflicted one? And, how can I get txhash of a transaction, that spends those same outputs and is confirmed(malleability situation)?
3
If you call listtransaction, you should get a JSON array called walletconflicts.
If your transaction conflicts with another transaction in your mempool or with a transaction in a block, this walletconflicts array is filled with n transactions-id's that points to the tx that spends the same, conflicting inputs.
walletconflicts is also present in gettransaction
