我正在使用Java的Hyperledger Fabric Gateway SDK连接我的本地HLF网络，默认情况下，该HLF网络可与VSCode的IBM区块链平台扩展一起使用。我已经从Create-BlockchainNetwork-IBPV20示例（https://github.com/IBM/Create-BlockchainNetwork-IBPV20/blob/master/README.md）部署了智能合约。它可以与Node.js客户端配合使用，能够提交和查询数据。

当我在Java中执行相同操作时，就会出现问题。我可以连接甚至查询数据，但是在尝试提交事务时，出现以下错误：

Exception in thread "main" org.hyperledger.fabric.gateway.ContractException: Failed to send transaction to the orderer
at org.hyperledger.fabric.gateway.impl.TransactionImpl.commitTransaction(TransactionImpl.java:145)
at org.hyperledger.fabric.gateway.impl.TransactionImpl.submit(TransactionImpl.java:96)
at org.hyperledger.fabric.gateway.impl.ContractImpl.submitTransaction(ContractImpl.java:50)
at com.dai.mastexport.mavenproject1.NewClass.main(NewClass.java:80)
Caused by: java.util.concurrent.ExecutionException: java.lang.Exception: Channel mychannel failed to place transaction 8eb41fb6477ee8162bfcedf28be255bb508043c1811794c761e42a359b31c682 on Orderer. Cause: UNSUCCESSFUL. 
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1915)
at org.hyperledger.fabric.gateway.impl.TransactionImpl.commitTransaction(TransactionImpl.java:139)
... 3 more
Caused by: java.lang.Exception: Channel mychannel failed to place transaction 8eb41fb6477ee8162bfcedf28be255bb508043c1811794c761e42a359b31c682 on Orderer. Cause: UNSUCCESSFUL. 
at org.hyperledger.fabric.sdk.Channel.doSendTransaction(Channel.java:5722)
at org.hyperledger.fabric.sdk.Channel.sendTransaction(Channel.java:5533)
at org.hyperledger.fabric.gateway.impl.TransactionImpl.commitTransaction(TransactionImpl.java:138)
... 3 more
Caused by: java.lang.Exception: Channel mychannel unsuccessful sendTransaction to orderer localhost:17076 (grpc://localhost:17076)
at org.hyperledger.fabric.sdk.Channel.doSendTransaction(Channel.java:5704)
... 5 more
Caused by: org.hyperledger.fabric.sdk.exception.TransactionException: Channel mychannel,send transactions failed on orderer OrdererClient{id: 6,channel: mychannel,name: localhost:17076,url: grpc://localhost:17076}. Reason:  timeout after 10000 ms.
at org.hyperledger.fabric.sdk.OrdererClient.sendTransaction(OrdererClient.java:223)
at org.hyperledger.fabric.sdk.Orderer.sendTransaction(Orderer.java:164)
at org.hyperledger.fabric.sdk.Channel.doSendTransaction(Channel.java:5686)
... 5 more

如果我要连接到云上的IBM Blockchain，则相同的Java代码会很好地工作。这是我的代码供参考：

public class NewClass {

static {
    System.setProperty("org.hyperledger.fabric.sdk.service_discovery.as_localhost","true");
}

public static void main(String[] args) throws Exception {
    String username = "admin";
    String pass = "adminpw";
    String msp = "Org1MSP";
    String orgName = "Org1MSP";
    String channelName = "mychannel";
    String connFile = "connection_test.json";


    java.nio.file.Path walletDirectory = java.nio.file.Paths.get("../wallets");
    Wallet wallet = Wallets.newFileSystemWallet(walletDirectory);
    java.nio.file.Path netConfPath = java.nio.file.Paths.get("../conf",connFile);

    // Create a CA client for interacting with the CA.
    NetworkConfig netConf = NetworkConfig.fromJsonFile(netConfPath.toFile());
    HFCAClient caClient = HFCAClient.createNewInstance(netConf.getOrganizationInfo(orgName).getcertificateAuthorities().get(0));
    CryptoSuite cryptoSuite = CryptoSuiteFactory.getDefault().getcryptoSuite();
    caClient.setCryptoSuite(cryptoSuite);

    // Check to see if we've already enrolled the admin user.
    Identity user = wallet.get(username);
    if (user == null) {
        // Enroll the admin user,and import the new identity into the wallet.
        Enrollment enrollment = caClient.enroll(username,pass);
        user = Identities.newX509Identity(msp,enrollment);
        wallet.put(username,user);
    }

    Gateway.Builder builder = Gateway.createBuilder();
    builder.identity(wallet,username).networkConfig(netConfPath).discovery(true);

    // create a gateway connection
    try (Gateway gateway = builder.connect()) {
        Network net = gateway.getNetwork(channelName);
        Contract contract = net.getcontract("blockchain-network");
        byte[] result = contract.submitTransaction("AddTrader","traderA","Mike","Smith");
        System.out.println(new String(result));
    }
}
}

我尝试了不同版本的SDK，但没有成功。到目前为止，我已经注意到，与来自云的连接配置文件相比，我来自本地网络的连接配置文件没有pem信息。这是本地个人资料：

{
"certificateAuthorities": {
    "Org1CA": {
        "caName": "ca","url": "http://localhost:17050"
    }
},"client": {
    "connection": {
        "timeout": {
            "orderer": "3000","peer": {
                "endorser": "3000"
            }
        }
    },"organization": "Org1MSP"
},"name": "Org1","organizations": {
    "Org1MSP": {
        "certificateAuthorities": [
            "Org1CA"
        ],"mspid": "Org1MSP","peers": [
            "Org1Peer1"
        ]
    }
},"peers": {
    "Org1Peer1": {
        "url": "grpc://localhost:17051"
    }
},"version": "1.0.0"
}