java.lang.NoClassDefFoundError: scalaz/Validation

Stack Overflow | hlagvankar | 6 months ago
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    Stack Overflow | 6 months ago | hlagvankar
    java.lang.NoClassDefFoundError: scalaz/Validation
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    java.lang.reflect.UndeclaredThrowableException
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  5. 0

    {{spring-data-commons}} 1.10.0.RELEASE introduced an improved instantiation strategy based on byte code generation. It's now the default instantiation strategy however it can't be used in custom Spring XD modules due to class loader issues. Please see attached custom module source code which can be build with Maven. You might want to change MongoDB connection parameters in {{custom-mongo-processor.xml}}. Execute following xd-shell commands {code} module upload --name custom-mongo-processor --type processor --file [location] stream create --name k2 --definition 'time --fixedDelay=10 | custom-mongo-processor | log' --deploy {code} The stream will output following message when the MongoDB collection is empty: {code} 2015-07-17T11:09:38+0100 1.2.0.RELEASE INFO task-scheduler-3 sink.k2 - {"content":[],"count":0} 2015-07-17T11:09:48+0100 1.2.0.RELEASE INFO task-scheduler-3 sink.k2 - {"content":[],"count":0} {code} After documents are inserted into collection by executing {{db.karolWidgets.insert(\{ "name": "bulbator", "color": "red" \})}} following exception will be thrown: {code} 2015-07-17T11:09:59+0100 1.2.0.RELEASE ERROR task-scheduler-3 handler.LoggingHandler - org.springframework.messaging.MessageHandlingException: ; nested exception is java.lang.IllegalStateException: Cannot process message at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:78) at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:71) at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:99) at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78) at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116) at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101) at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97) at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:287) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:245) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:95) at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:231) at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:154) at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:102) at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:105) at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78) at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116) at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101) at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97) at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:287) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:245) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:95) at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:231) at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:154) at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:102) at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:105) at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78) at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116) at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101) at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97) at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:287) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:245) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:95) at org.springframework.integration.endpoint.SourcePollingChannelAdapter.handleMessage(SourcePollingChannelAdapter.java:130) at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:219) at org.springframework.integration.endpoint.AbstractPollingEndpoint.access$000(AbstractPollingEndpoint.java:55) at org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:149) at org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:146) at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller$1.run(AbstractPollingEndpoint.java:298) at org.springframework.integration.util.ErrorHandlingTaskExecutor$1.run(ErrorHandlingTaskExecutor.java:52) at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:49) at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.run(AbstractPollingEndpoint.java:292) at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.IllegalStateException: Cannot process message at org.springframework.integration.util.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:292) at org.springframework.integration.util.MessagingMethodInvokerHelper.process(MessagingMethodInvokerHelper.java:142) at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:75) ... 59 more Caused by: java.lang.NoClassDefFoundError: com/test/mongodb/MongoWidget at com.test.mongodb.MongoWidget_Instantiator_monxdt.newInstance(Unknown Source) at org.springframework.data.convert.BytecodeGeneratingEntityInstantiator$EntityInstantiatorAdapter.createInstance(BytecodeGeneratingEntityInstantiator.java:193) at org.springframework.data.convert.BytecodeGeneratingEntityInstantiator.createInstance(BytecodeGeneratingEntityInstantiator.java:76) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:250) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:231) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:191) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:187) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:78) at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:2191) at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1873) at org.springframework.data.mongodb.core.MongoTemplate.findAll(MongoTemplate.java:1286) at com.test.mongodb.MongoService.processWidgets(MongoService.java:21) at sun.reflect.GeneratedMethodAccessor83.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:112) at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:102) at org.springframework.expression.spel.ast.MethodReference.access$000(MethodReference.java:49) at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:342) at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:88) at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:131) at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:330) at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:164) at org.springframework.integration.util.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:276) ... 61 more Caused by: java.lang.ClassNotFoundException: com.test.mongodb.MongoWidget at java.lang.ClassLoader.findClass(ClassLoader.java:531) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 85 more {code} This exception affects both custom stream and job modules. One workaround is to force {{ReflectionEntityInstantiator}} in {{MappingMongoConverter}} however this has to be done in every custom module. Perhaps that's an issue with Spring XD custom module classloaders (or DATACMNS-710)?

    Spring JIRA | 2 years ago | Karol Dowbecki
    org.springframework.messaging.MessageHandlingException: ; nested exception is java.lang.IllegalStateException: Cannot process message
  6. 0

    {{spring-data-commons}} 1.10.0.RELEASE introduced an improved instantiation strategy based on byte code generation. It's now the default instantiation strategy however it can't be used in custom Spring XD modules due to class loader issues. Please see attached custom module source code which can be build with Maven. You might want to change MongoDB connection parameters in {{custom-mongo-processor.xml}}. Execute following xd-shell commands {code} module upload --name custom-mongo-processor --type processor --file [location] stream create --name k2 --definition 'time --fixedDelay=10 | custom-mongo-processor | log' --deploy {code} The stream will output following message when the MongoDB collection is empty: {code} 2015-07-17T11:09:38+0100 1.2.0.RELEASE INFO task-scheduler-3 sink.k2 - {"content":[],"count":0} 2015-07-17T11:09:48+0100 1.2.0.RELEASE INFO task-scheduler-3 sink.k2 - {"content":[],"count":0} {code} After documents are inserted into collection by executing {{db.karolWidgets.insert(\{ "name": "bulbator", "color": "red" \})}} following exception will be thrown: {code} 2015-07-17T11:09:59+0100 1.2.0.RELEASE ERROR task-scheduler-3 handler.LoggingHandler - org.springframework.messaging.MessageHandlingException: ; nested exception is java.lang.IllegalStateException: Cannot process message at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:78) at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:71) at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:99) at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78) at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116) at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101) at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97) at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:287) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:245) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:95) at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:231) at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:154) at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:102) at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:105) at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78) at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116) at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101) at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97) at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:287) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:245) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:95) at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:231) at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:154) at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:102) at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:105) at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78) at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116) at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101) at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97) at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:287) at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:245) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:95) at org.springframework.integration.endpoint.SourcePollingChannelAdapter.handleMessage(SourcePollingChannelAdapter.java:130) at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:219) at org.springframework.integration.endpoint.AbstractPollingEndpoint.access$000(AbstractPollingEndpoint.java:55) at org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:149) at org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:146) at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller$1.run(AbstractPollingEndpoint.java:298) at org.springframework.integration.util.ErrorHandlingTaskExecutor$1.run(ErrorHandlingTaskExecutor.java:52) at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:49) at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.run(AbstractPollingEndpoint.java:292) at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.IllegalStateException: Cannot process message at org.springframework.integration.util.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:292) at org.springframework.integration.util.MessagingMethodInvokerHelper.process(MessagingMethodInvokerHelper.java:142) at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:75) ... 59 more Caused by: java.lang.NoClassDefFoundError: com/test/mongodb/MongoWidget at com.test.mongodb.MongoWidget_Instantiator_monxdt.newInstance(Unknown Source) at org.springframework.data.convert.BytecodeGeneratingEntityInstantiator$EntityInstantiatorAdapter.createInstance(BytecodeGeneratingEntityInstantiator.java:193) at org.springframework.data.convert.BytecodeGeneratingEntityInstantiator.createInstance(BytecodeGeneratingEntityInstantiator.java:76) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:250) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:231) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:191) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:187) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:78) at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:2191) at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1873) at org.springframework.data.mongodb.core.MongoTemplate.findAll(MongoTemplate.java:1286) at com.test.mongodb.MongoService.processWidgets(MongoService.java:21) at sun.reflect.GeneratedMethodAccessor83.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:112) at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:102) at org.springframework.expression.spel.ast.MethodReference.access$000(MethodReference.java:49) at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:342) at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:88) at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:131) at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:330) at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:164) at org.springframework.integration.util.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:276) ... 61 more Caused by: java.lang.ClassNotFoundException: com.test.mongodb.MongoWidget at java.lang.ClassLoader.findClass(ClassLoader.java:531) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 85 more {code} This exception affects both custom stream and job modules. One workaround is to force {{ReflectionEntityInstantiator}} in {{MappingMongoConverter}} however this has to be done in every custom module. Perhaps that's an issue with Spring XD custom module classloaders (or DATACMNS-710)?

    Spring JIRA | 2 years ago | Karol Dowbecki
    org.springframework.messaging.MessageHandlingException: ; nested exception is java.lang.IllegalStateException: Cannot process message

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Root Cause Analysis

  1. java.lang.ClassNotFoundException

    scalaz.Validation

    at java.net.URLClassLoader$1.run()
  2. Java RT
    ClassLoader.loadClass
    1. java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    2. java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    3. java.security.AccessController.doPrivileged(Native Method)
    4. java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    5. java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    6. java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    6 frames