Transaction does not get processed

Question

I am using a local testnet. I send transactions with eth_sendRawTransaction but unfortunately sometimes the transaction pass and sometimes not.

When it does not pass I have two things happening at the same time:

1. I cannot get a transaction receipt, that is the eth_getTransactionReceipt returns null
2. If I resubmit the transaction then I got the known transaction error.

What is happening? What could be a possible solution to the problem?

Answer 1

I found the answer to my problem. I was submitting transaction with nonce=1 in some case and nonce=0 in some other. The case with nonce=1 cannot go forward because the case with nonce=0 need to be treated first. Hence the blocking.

Answer 2

In that case -

1. put higher gas value for next transaction Or

2. retrieve the current nonce then put nonce=currentNonce+1 for further transactions