由于web3j没有实现getPendingTransactions接口，业务又需要，所以补充下
参考下web3.js (Github Code)

 new Method({
     name: 'getPendingTransactions',
     call: 'eth_pendingTransactions',
     params: 0,
     outputFormatter: formatter.outputTransactionFormatter
 }),

通过查询(Github Code)

找到以下轮子 （Github Code）

 @Override
    public List<Transaction> getPendingTransactions() throws EthereumException {
        // only works if a gexp node is used (pending transaction sent by one of the gexp accounts are returned)
        LOG.info("Get pending transactions sent by addr");
        JsonRpcRequest jsonRpcRequest = new JsonRpcRequest();
        jsonRpcRequest.setId(0);
        jsonRpcRequest.setMethod("eth_pendingTransactions");
        jsonRpcRequest.setJsonrpc("2.0");
        HttpEntity<JsonRpcRequest> request = new HttpEntity<>(jsonRpcRequest);
        PendingTransactionResponse response = doPOST(getNodeBaseUrl(), request, PendingTransactionResponse.class);

        List<Transaction> pendingTransactions = response
                .getPendingTransactions()
                .parallelStream()
                .map(DtoConverter::convert)
                .collect(Collectors.toList());

        LOG.info("Pending transactions found: " + pendingTransactions.size());
        return pendingTransactions;
    }

如果完整的，应该fork扩充到 (Github Code)

--rpc.txfeecap value 设置可以通过 RPC API 发送的交易费用上限（以以太为单位）（0 = 无上限）（默认值：1）

https://geth.ethereum.org/docs/interface/command-line-options

多个文件验证不可控因素有点多，你用truffle-flatten做成一个文件，然后使用remix部署，然后再验证，就是单个文件验证，直接复制remix里的代码，比较顺利

web3.js

const address = "0x0089d53F703f7E0843953D48133f74cE247184c2"
let result = Web3.utils.isAddress(address)
console.log(result)  // => true

web3j

社区fork为其增加了isAddress commit
https://github.com/bcskill/web3j

package org.web3j.utils;

import org.junit.Test;

import static junit.framework.TestCase.assertFalse;
import static org.junit.Assert.assertTrue;

import static org.web3j.utils.Account.isAddress;

public class AccountTest {
    @Test
    public void verifyIsAddress() {
        String validLowerCaseAddress = "0x3de8c14c8e7a956f5cc4d82beff749ee65fdc358";
        assertTrue(isAddress(validLowerCaseAddress));
        String validChecksumAddress = "0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359";
        assertTrue(isAddress(validChecksumAddress));
        String invalidLengthAddress = "0x3de8c14c8e7a956f5cc4d82beff749ee65bac35";
        assertFalse(isAddress(invalidLengthAddress));
        String invalidChecksumAddress = "0x3de8c14c8E7a956f5cc4d82beff749ee65fdc358";
        assertFalse(isAddress(invalidChecksumAddress));
    }
} 

参考

https://piyopiyo.medium.com/how-to-check-if-ethereum-address-is-valid-or-not-ef587b6c4819
https://github.com/assafY/web3j.git

不要使用

go mod vendor

https://github.com/ethereum/go-ethereum/issues/20232
https://github.com/ethereum/go-ethereum/issues/22961