我有一个使用亚马逊AWS SDK for Java查询EC2 Jackson数据的应用程序。使用AWS SDK中包含的Jackson.fromJsonString(String, Class)包装类将实例序列化为JSON字符串。稍后，我可以使用Instance方法将JSON字符串反序列化为EC2 com.amazonaws.SdkClientException: Unable to parse Json String.
at com.amazonaws.util.json.Jackson.fromJsonString(Jackson.java:66)
at com.myapp.filters.test.AbstractResourceFilterCriteriaTest.testMeetsCriteria_Fail(AbstractResourceFilterCriteriaTest.java:166)
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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "instanceType": com.amazonaws.services.ec2.model.Instance#setInstanceType(1 params) vs com.amazonaws.services.ec2.model.Instance#setInstanceType(1 params)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:269)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:461)
at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:3838)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3732)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2726)
at com.amazonaws.util.json.Jackson.fromJsonString(Jackson.java:64)
... 26 more
Caused by: java.lang.IllegalArgumentException: Conflicting setter definitions for property "instanceType": com.amazonaws.services.ec2.model.Instance#setInstanceType(1 params) vs com.amazonaws.services.ec2.model.Instance#setInstanceType(1 params)
at com.fasterxml.jackson.databind.introspect.POJOPropertyBuilder.getSetter(POJOPropertyBuilder.java:300)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.filterBeanProps(BeanDeserializerFactory.java:619)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.addBeanProps(BeanDeserializerFactory.java:515)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:256)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:169)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:403)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:352)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264)
... 33 more
对象。
这一切都适用于我的应用程序代码。但是，从Eclipse中的JUnit测试运行时，它每次都会失败。我正在使用完全相同的数据，以及完全相同的反序列化代码。但是，当我从JUnit测试运行它时，我得到以下异常：
Instance知道这里究竟出了什么问题吗？为什么它在主应用程序代码中运行得很好，但在作为JUnit测试运行时失败了？由于我不拥有institutes Table
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Locations table
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courses table
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1 | 1 | php
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2 | 1 | delhi
对象（它是亚马逊SDK的一部分），我无法修改任何杰克逊注释。我知道如何为我的单元测试解决这个问题吗？
答案 0 :(得分：2)
我想说你可能在测试和生产之间存在SDK的版本问题。查看这个类的源代码：
它们似乎在两个setter之一上有jackson的注释，指定用于序列化/反序列化的那个。这是最新版本，我没有在历史记录中找回旧版本是否缺少此版本。