spring-boot - Nomin 和 Spring Boot 应用：递归映射规则 a = b 导致无限循环

Question

由于我在使用Nomin 、Eclipse 和 Groovy的组合时已经遇到了一些问题（请参阅链接 1和链接 2 ），我再次为它苦苦挣扎。

我的应用程序通过 Gradle 和 Eclipse 在控制台中使用 JUnit 测试。但是现在它不想在执行 SpringBoot-Main 类时工作。无论是在 Eclipse 中，还是gradle bootRun在控制台或 Eclipse Gradle 任务 => 相同的异常中

@SpringBootApplication
class CcmApplication {

    static void main(String[] args) {
        def ctx = SpringApplication.run CcmApplication, args
        def scanner = new Scanner(System.in);
        print 'Press <Return> to quit program'
        scanner.nextLine()
        scanner.close()
        ctx.close()
    }
}

转换器类：

class CoinMarketCapTransformer {
    def resource = ClassPathResource.newInstance("coinmarketcap2coin.groovymapper")
    println resource.isFile() // Prints true
    println resource.isReadable() // Prints true
    Nomin nomin = Nomin.newInstance(resource.filename)

    CoinOnMarketPlace transform(Coin coin, @Header(name="marketName", required=true) String marketName) {
        MarketPlace marketPlace = MarketPlace.newInstance(name: marketName)
        CoinOnMarketPlace comp = nomin.map(coin, CoinOnMarketPlace)
        comp.setMarketPlace(marketPlace)
        comp
    }

    Coin transform(CoinOnMarketPlace comp) {
        nomin.map(comp, Coin.class)
    } 
}

coinmarketcap2coin.groovymapper 为什么我命名它，.groovymapper请参阅上面的链接。它的位置是src/main/resources

import net.hemisoft.ccm.domain.CoinOnMarketPlace
import net.hemisoft.ccm.porter.Coin

mappingFor a: CoinOnMarketPlace, b: Coin
introspector exploding 
automap()

a.coin.coinId       =       b.coinId
a.coin.name         =       b.name
a.coin.symbol       =       b.symbol

a.lastUpdate        =       b.lastUpdateEpoch
convert to_a: { lastUpdateEpoch -> DateUtils.convertEpochMillis(lastUpdateEpoch) }
convert to_b: { lastUpdate -> DateUtils.convertLocalDateTime(lastUpdate) }

堆栈跟踪：

2018-01-21 17:18:23.288 ERROR 16872 --- [sk-scheduler-10] o.s.integration.handler.LoggingHandler   : org.springframework.integration.transformer.MessageTransformationException: Failed to transform Message; nested exception is org.springframework.messaging.MessageHandlingException: nested exception is org.nomin.core.NominException: org.nomin.Mapping: Recursive mapping rule a = b causes infinite loop!, failedMessage=GenericMessage [payload=net.hemisoft.ccm.porter.Coin(bitcoin, Bitcoin, BTC, 1, 11524.4, 1.0, 9.96663E9, 1.93806837423E11, 1.6817087E7, 1.6817087E7, 2.1E7, -3.42, -10.21, -15.21, 1516551267), headers={sequenceNumber=1, Server=cloudflare, sequenceSize=100, Connection=keep-alive, http_statusCode=200, Date=1516551503000, marketName=coinMarketCap, Set-Cookie=__cfduid=dba860f31637c55e679ebf89660fcc7701516551503; expires=Mon, 21-Jan-19 16:18:23 GMT; path=/; domain=.coinmarketcap.com; HttpOnly; Secure, correlationId=dd703a62-f9b4-4838-ddfe-d5f272ce894a, id=c0ce3ae4-f478-c8c4-7901-dbf0061da1e2, Content-Length=54264, contentType=application/json, timestamp=1516551503272}], failedMessage=GenericMessage [payload=net.hemisoft.ccm.porter.Coin(bitcoin, Bitcoin, BTC, 1, 11524.4, 1.0, 9.96663E9, 1.93806837423E11, 1.6817087E7, 1.6817087E7, 2.1E7, -3.42, -10.21, -15.21, 1516551267), headers={sequenceNumber=1, Server=cloudflare, sequenceSize=100, Connection=keep-alive, http_statusCode=200, Date=1516551503000, marketName=coinMarketCap, Set-Cookie=__cfduid=dba860f31637c55e679ebf89660fcc7701516551503; expires=Mon, 21-Jan-19 16:18:23 GMT; path=/; domain=.coinmarketcap.com; HttpOnly; Secure, correlationId=dd703a62-f9b4-4838-ddfe-d5f272ce894a, id=c0ce3ae4-f478-c8c4-7901-dbf0061da1e2, Content-Length=54264, contentType=application/json, timestamp=1516551503272}]
at org.springframework.integration.transformer.MessageTransformingHandler.handleRequestMessage(MessageTransformingHandler.java:95)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:109)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:141)
at org.springframework.integration.dispatcher.BroadcastingDispatcher.invokeHandler(BroadcastingDispatcher.java:224)
at org.springframework.integration.dispatcher.BroadcastingDispatcher.dispatch(BroadcastingDispatcher.java:180)
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:438)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:388)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:181)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:160)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:418)
at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:328)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:219)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:115)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:141)
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:132)
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:105)
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:438)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:388)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:181)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:160)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:418)
at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:328)
at org.springframework.integration.handler.MessageHandlerChain$ReplyForwardingMessageChannel.send(MessageHandlerChain.java:238)
at org.springframework.messaging.MessageChannel.send(MessageChannel.java:45)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:181)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:160)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:418)
at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:328)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:219)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:115)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:141)
at org.springframework.integration.handler.MessageHandlerChain.lambda$configureChain$0(MessageHandlerChain.java:124)
at org.springframework.messaging.MessageChannel.send(MessageChannel.java:45)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:181)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:160)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:418)
at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:328)
at org.springframework.integration.splitter.AbstractMessageSplitter.produceOutput(AbstractMessageSplitter.java:231)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:219)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:115)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:141)
at org.springframework.integration.handler.MessageHandlerChain.handleMessageInternal(MessageHandlerChain.java:110)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:141)
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:132)
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:105)
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:438)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:388)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:181)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:160)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:418)
at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:328)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:219)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:115)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:141)
at org.springframework.integration.endpoint.PollingConsumer.handleMessage(PollingConsumer.java:129)
at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:278)
at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.lambda$run$0(AbstractPollingEndpoint.java:379)
at org.springframework.integration.util.ErrorHandlingTaskExecutor.lambda$execute$0(ErrorHandlingTaskExecutor.java:53)
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50)
at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:51)
at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.run(AbstractPollingEndpoint.java:373)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.messaging.MessageHandlingException: nested exception is org.nomin.core.NominException: org.nomin.Mapping: Recursive mapping rule a = b causes infinite loop!, failedMessage=GenericMessage [payload=net.hemisoft.ccm.porter.Coin(bitcoin, Bitcoin, BTC, 1, 11524.4, 1.0, 9.96663E9, 1.93806837423E11, 1.6817087E7, 1.6817087E7, 2.1E7, -3.42, -10.21, -15.21, 1516551267), headers={sequenceNumber=1, Server=cloudflare, sequenceSize=100, Connection=keep-alive, http_statusCode=200, Date=1516551503000, marketName=coinMarketCap, Set-Cookie=__cfduid=dba860f31637c55e679ebf89660fcc7701516551503; expires=Mon, 21-Jan-19 16:18:23 GMT; path=/; domain=.coinmarketcap.com; HttpOnly; Secure, correlationId=dd703a62-f9b4-4838-ddfe-d5f272ce894a, id=c0ce3ae4-f478-c8c4-7901-dbf0061da1e2, Content-Length=54264, contentType=application/json, timestamp=1516551503272}]
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:107)
at org.springframework.integration.transformer.AbstractMessageProcessingTransformer.transform(AbstractMessageProcessingTransformer.java:90)
at org.springframework.integration.transformer.MessageTransformingHandler.handleRequestMessage(MessageTransformingHandler.java:89)
... 84 more
Caused by: org.nomin.core.NominException: org.nomin.Mapping: Recursive mapping rule a = b causes infinite loop!
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:83)
at org.codehaus.groovy.reflection.CachedConstructor.doConstructorInvoke(CachedConstructor.java:77)
at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrap.callConstructor(ConstructorSite.java:84)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:247)
at org.nomin.core.MappingEntry.validate(MappingEntry.groovy:64)
at sun.reflect.GeneratedMethodAccessor121.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210)
at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:59)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
at org.nomin.core.MappingEntry.parse(MappingEntry.groovy:56)
at sun.reflect.GeneratedMethodAccessor120.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1224)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1033)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:1010)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:993)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:168)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodNSafe(ScriptBytecodeAdapter.java:176)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodNSpreadSafe(ScriptBytecodeAdapter.java:183)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethod0SpreadSafe(ScriptBytecodeAdapter.java:198)
at org.nomin.Mapping.parse(Mapping.groovy:44)
at org.nomin.core.Nomin.findApplicable(Nomin.java:228)
at org.nomin.core.Nomin.findCachedApplicable(Nomin.java:211)
at org.nomin.core.Nomin.map(Nomin.java:201)
at org.nomin.core.Nomin.map(Nomin.java:159)
at org.nomin.core.Nomin.map(Nomin.java:156)
at org.nomin.NominMapper$map.call(Unknown Source)
at net.hemisoft.ccm.repository.CoinMarketCapTransformer.transform(CoinMarketCapTransformer.groovy:17)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:181)
at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:114)
at org.springframework.integration.util.MessagingMethodInvokerHelper$HandlerMethod.invoke(MessagingMethodInvokerHelper.java:1039)
at org.springframework.integration.util.MessagingMethodInvokerHelper.invokeHandlerMethod(MessagingMethodInvokerHelper.java:608)
at org.springframework.integration.util.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:504)
at org.springframework.integration.util.MessagingMethodInvokerHelper.process(MessagingMethodInvokerHelper.java:313)
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:104)
... 86 more

更新：

以下 CodeSnippetNomin.class在测试下运行时按预期工作。通过 bootRun 运行时，如果第 220 行的 else 为假，那么应该为真。

在第 220 行，我们得到pm.sideB.isAssignableFrom(key.source)了应该得到的结果true，因为pm.sideB是类型Coin，并且key.source是类型Coin（参见屏幕截图）。

score 2 · Accepted Answer

您的问题是由spring-boot-devtools运行时依赖性引起的。当您使用调试器运行应用程序时，您会发现这些类net.hemisoft.ccm.porter.Coin并net.hemisoft.ccm.domain.CoinOnMarketPlace使用两个不同的类加载器加载了两次：

sun.misc.Launcher$AppClassLoader
org.springframework.boot.devtools.restart.classloader.RestartClassLoader

这就是为什么以下部分代码计算为false：

else if (pm.sideB.isAssignableFrom(key.source) && pm.sideA.isAssignableFrom(key.target)) result.add(new MappingWithDirection(pm, false));

尽管key.source并且pm.sideB似乎是“相同”的类，但它们并不相等，因为它们由两个不同的类加载器管理。具有相同规范名称的类仅在同一个类加载器内是相等的。这就是为什么您的单元测试像魅力一样工作的原因 - 不涉及 Spring Boot 开发工具，如果您Nomin.java:(line 220)在运行单元测试时使用调试器，您将看到它key.source并pm.sideB在一个类加载器中保存对同一类的引用，因此该表达式计算totrue并且正在使用您定义的映射。否则nomin会尝试自动生成映射（可以使用禁用Nomin.disableAutoMapping()），在这种情况下，它使用默认的内省 -ReflectionIntrospector. 正如我们在您之前的一个 SO 问题中已经发现的那样，这会导致 Groovy 类出现问题。

解决方案

禁用spring-boot-devtools或禁用重新启动，或者至少尝试将您的域类排除在重新启动应用程序之外。您可以查看Spring Boot Devtools 文档以了解如何操作。我只想摆脱它 - 正如您所看到的，它使您的应用程序在您的开发环境中以不同的方式运行，因此您永远无法确定它在实时运行时的行为方式。

spring-boot - Nomin 和 Spring Boot 应用：递归映射规则 a = b 导致无限循环

1 回答 1

解决方案

Related

Reference