无法在 Corda 中启动流程 - java.lang.IllegalStateException：这只能在流程启动后完成

【问题标题】：Not able to start flow in corda - java.lang.IllegalStateException: This can only be done after the flow has been started无法在 Corda 中启动流程 - java.lang.IllegalStateException：这只能在流程启动后完成
【发布时间】：2018-05-14 17:07:59
【问题描述】：

Corda 的新手，我敢肯定，我在这里遗漏了一些东西。

通过我的 API，我正在尝试为此自行发行商品，我正在使用以下行开始发行流程：

FlowProgressHandle<SignedTransaction> flowHandle = rpcOps
                    .startTrackedFlowDynamic(BlockIssueFlow.class, orderValue);

但是，我的代码失败并出现以下异常：

[m net.corda.client.rpc.RPCException:
        at net.corda.client.rpc.internal.RPCClientProxyHandler.invoke(RPCClientProxyHandler.kt:238) ~[corda-rpc-3.1-corda.jar:?]
        at com.sun.proxy.$Proxy29.startTrackedFlowDynamic(Unknown Source) ~[?:?]
        at com.template.ledger.api.GoldBlockAPI.issueGb(GoldBlockAPI.java:88) [cordapp-0.1.jar:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_151]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_151]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_151]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_151]
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) [jersey-common-2.25.jar:?]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) [jersey-common-2.25.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:315) [jersey-common-2.25.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:297) [jersey-common-2.25.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:267) [jersey-common-2.25.jar:?]
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) [jersey-common-2.25.jar:?]
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) [jersey-server-2.25.jar:?]
        at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) [jersey-container-servlet-core-2.25.jar:?]
        at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) [jersey-container-servlet-core-2.25.jar:?]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) [jersey-container-servlet-core-2.25.jar:?]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) [jersey-container-servlet-core-2.25.jar:?]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) [jersey-container-servlet-core-2.25.jar:?]
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841) [jetty-servlet-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:535) [jetty-servlet-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) [jetty-servlet-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.Server.handle(Server.java:561) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:334) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) [jetty-server-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279) [jetty-io-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:104) [jetty-io-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124) [jetty-io-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:247) [jetty-util-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140) [jetty-util-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131) [jetty-util-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:243) [jetty-util-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:679) [jetty-util-9.4.7.v20170914.jar:9.4.7.v20170914]
        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:597) [jetty-util-9.4.7.v20170914.jar:9.4.7.v20170914]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_151]
Caused by: java.lang.reflect.InvocationTargetException
Caused by: java.lang.IllegalStateException:

这只能在流程启动后完成。

谢谢！

【问题讨论】：

  • 这很奇怪。您可以将代码上传到任何地方吗？此外，请仔细检查日志 - 它是否指向您的流程代码中的特定错误？
  • 谢谢乔尔。我刚刚将我的代码添加到 github.com/amitxpamecha/corda/blob/master/cordapp/src/main/java/… 它的 issueGb() API，我正试图从中调用流程。
  • 可能我必须重新设计我编写流程的方式。我从示例项目中复制了 ExampleFlow，运行良好。我将重构并回到这个线程。

标签： corda


【解决方案1】：

问题是您尝试在构造函数中访问流的状态机，以便访问节点的ServiceHub：

PartyAndReference partyAndReference = new PartyAndReference(
    getServiceHub().getMyInfo().getLegalIdentities().get(0), 
    ref
);

流状态机在流的构造函数被调用之后被初始化，所以ServiceHub不能在构造函数中被访问。

此 PR 针对以下情况提供改进的错误消息：https://github.com/corda/corda/pull/3144。

【讨论】：

  • 我花了一段时间才弄清楚问题出在哪里，根据 PR，我仍然收到 Corda 3.3 中的旧错误消息
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