web3j智能合约错误：java.lang.ArrayIndexOutOfBoundsException

web3j:智能合约写操作时总是抛出java.lang.ArrayIndexOutOfBoundsException错误，不知道什么问题。

我的代码如下：

String hexPrivateKey = String.format("%040x", new BigInteger(1, Config.privateKey.getBytes()));
String hexPublicKey = String.format("%040x", new BigInteger(1, Config.publicKey.getBytes()));
Credentials credentials = Credentials.create(hexPrivateKey, hexPublicKey);
DataSaver contract = DataSaver.load(
address, web3j, credentials, Contract.GAS_PRICE, Contract.GAS_LIMIT);RemoteCall transaction2 = contract.updateDocumentPayload(
BigInteger.valueOf(1), "Test");
transaction2.send();

读取操作是成功的。写入返回以下错误：

java.lang.ArrayIndexOutOfBoundsExceptionat java.lang.System.arraycopy(Native Method)at org.bouncycastle.crypto.signers.HMacDSAKCalculator.init(Unknown Source)at org.bouncycastle.crypto.signers.ECDSASigner.generateSignature(Unknown Source)at org.web3j.crypto.ECKeyPair.sign(ECKeyPair.java:46)at org.web3j.crypto.Sign.signMessage(Sign.java:52)at org.web3j.crypto.Sign.signMessage(Sign.java:40)at org.web3j.crypto.TransactionEncoder.signMessage(TransactionEncoder.java:21)at org.web3j.tx.RawTransactionManager.signAndSend(RawTransactionManager.java:102)at org.web3j.tx.RawTransactionManager.sendTransaction(RawTransactionManager.java:91)at org.web3j.tx.TransactionManager.executeTransaction(TransactionManager.java:49)at org.web3j.tx.ManagedTransaction.send(ManagedTransaction.java:83)at org.web3j.tx.Contract.executeTransaction(Contract.java:242)at org.web3j.tx.Contract.executeTransaction(Contract.java:226)at org.web3j.tx.Contract.executeTransaction(Contract.java:220)at org.web3j.tx.Contract.lambda$executeRemoteCallTransaction$3(Contract.java:259)at org.web3j.protocol.core.RemoteCall.send(RemoteCall.java:30)at com.company.api.v1.contract.ContractDocumentPayload.postDocumentPayload(ContractDocumentPayload.java:104)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:205)at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)at org.glassfish.jersey.internal.Errors.process(Errors.java:315)at org.glassfish.jersey.internal.Errors.process(Errors.java:297)at org.glassfish.jersey.internal.Errors.process(Errors.java:267)at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473)at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427)at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:409)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Unknown Source)

问题的解决

应该是将错误的私钥传递给webb3j来签署交易时，会将引发该异常。请看下面的例子。

正确的工作代码（带有有效私钥）：

BigInteger privateKey = new BigInteger("f9c8a5d689736d881cf9b4117bbae6d935b2368f8260a25677e35d4d1eea7231", 16);
BigInteger publicKey = new BigInteger("72445fcfdeb1fff79496d7ce66089d663ff90e26", 16);
ECKeyPair pair = new ECKeyPair(privateKey, publicKey);
pair.sign("".getBytes());

相同的代码使用无效的私钥（随便添加一个数字比如a），就会抛出与你完全相同的异常：

BigInteger privateKey = new BigInteger("f9c8a5d689736d881cf9b4117bbae6d935b2368f8260a25677e35d4d1eea7231a", 16);
BigInteger publicKey = new BigInteger("72445fcfdeb1fff79496d7ce66089d663ff90e26a", 16);
ECKeyPair pair = new ECKeyPair(privateKey, publicKey);
pair.sign("".getBytes());

始终通过WalletUtils.isValidPrivateKey()和WalletUtils.isValidAddress()来检查私钥和地址是否有效。

原文《以太坊常见问题和错误》中的:
http://cw.hubwiz.com/card/c/ethereum-FAQ/1/2/9/

另外推荐几个很受欢迎全网稀缺的互动教程：

web3j，主要是针对java和android程序员围绕web3j库进行区块链以太坊开发的讲解。

python以太坊，主要是针对python围绕web3.py进行区块链以太坊应用开发的讲解。

php以太坊，主要是介绍使用php进行智能合约开发交互，进行账号创建、交易、转账、代币开发以及过滤器和事件等内容。

以太坊开发，主要是介绍使用node.js、mongodb、区块链、ipfs实现去中心化电商DApp实战，适合进阶。

以太坊教程，主要介绍智能合约与dapp应用开发，适合入门。

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