我们正在尝试使用 bitcoinj 0.15.10 库来管理比特币钱包。我们遇到的问题是我们如何将现有钱包与我们的代码连接起来，以便我们进行交易。我们已经尝试了在文档和来自 github 的示例中可以找到的所有内容，但没有任何效果。在这里，我们找到了一些代码示例，但它给我们带来了钱包中没有钱的错误。
NetworkParameters params = TestNet3Params.get();
String seedCode = "xxx";
long creationtime = 1409478661L;
DeterministicSeed seed = new DeterministicSeed(seedCode, null, "", creationtime);
Wallet wallet = Wallet.fromSeed(params, seed, Script.ScriptType.P2PKH);
BlockStore blockStore = new MemoryBlockStore(params);
BlockChain chain = new BlockChain(params, wallet, blockStore);
final PeerGroup peerGroup = new PeerGroup(params, chain);
peerGroup.startAsync();
System.out.println(wallet.toString());
Address target1 = LegacyAddress.fromBase58(params, "mkHS9ne12qx9pS9VojpwU5xtRd4T7X7ZUt");
// Address target2 = LegacyAddress.fromBase58(params, "mkHS9ne12qx9pS9VojpwU5xtRd4T7X7ZUt");
Transaction tx = new Transaction(params);
tx.addOutput(Coin.parseCoin("0.0002"), target1);
// tx.addOutput(Coin.parseCoin("0.0001"), target2);
SendRequest request = SendRequest.forTx(tx);
wallet.completeTx(request);
wallet.commitTx(request.tx);
peerGroup.broadcastTransaction(request.tx);
peerGroup.stop();
打印钱包显示钱包没有交易，也没有比特币。我们从 block.io 网站加载了一个有效种子的钱包，并在上面获得了一些 BTC。这是我们得到的错误：
2021-08-26 15:31:42.358 INFO 16788 --- [nio-8080-exec-2] org.bitcoinj.wallet.Wallet : Completing send tx with 1 outputs totalling 0.0002 BTC and a fee of 0.001 BTC/kB
org.bitcoinj.core.InsufficientMoneyException: Insufficient money, missing 0.0002 BTC
at org.bitcoinj.wallet.Wallet.calculateFee(Wallet.java:5070)
at org.bitcoinj.wallet.Wallet.completeTx(Wallet.java:4165)
at dgms.controller.WalletControler.testTransaction(WalletControler.java:150)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1064)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
有人可以帮助我们使用 bitcoinj 库将我们的 java 代码与现有的 BTC（testnet）钱包连接起来吗？