升級到 spring boot 2.3 和 spring data elasticsearch 4.0.9 后出現問題。我有一個這樣的檔案：
public class Entity implements Serializable {
@Id private String id;
private URL url;
...
}
Thi在Jackson的spring data 3.0上作業得很好，但升級到4.0后，Jackson不再可用，現在我收到spring的實體化例外，無法實體化URL物件。
例外：
org.springframework.data.mapping.model.MappingInstantiationException: Failed to instantiate java.net.URL using constructor NO_CONSTRUCTOR with arguments
at org.springframework.data.mapping.model.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:65)
at org.springframework.data.mapping.model.ClassGeneratingEntityInstantiator.createInstance(ClassGeneratingEntityInstantiator.java:87)
at org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter.readEntity(MappingElasticsearchConverter.java:178)
at org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter.readMapValue(MappingElasticsearchConverter.java:375)
at org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter.readValue(MappingElasticsearchConverter.java:296)
at org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter$ElasticsearchPropertyValueProvider.getPropertyValue(MappingElasticsearchConverter.java:915)
at org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter.readProperties(MappingElasticsearchConverter.java:253)
at org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter.readEntity(MappingElasticsearchConverter.java:185)
at org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter.read(MappingElasticsearchConverter.java:165)
at org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter.read(MappingElasticsearchConverter.java:74)
at org.springframework.data.elasticsearch.core.AbstractElasticsearchTemplate$ReadDocumentCallback.doWith(AbstractElasticsearchTemplate.java:602)
at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.get(ElasticsearchRestTemplate.java:166)
at org.springframework.data.elasticsearch.repository.support.AbstractElasticsearchRepository.findById(AbstractElasticsearchRepository.java:118)
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.data.repository.core.support.ImplementationInvocationMetadata.invoke(ImplementationInvocationMetadata.java:72)
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:382)
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:205)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:550)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:155)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:130)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy176.findById(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy176.findById(Unknown Source)
at com.callfire.starters.elasticsearch.starter.store.AbstractGenericElasticSearchMapStore.load(AbstractGenericElasticSearchMapStore.java:153)
at com.callfire.starters.elasticsearch.starter.store.AbstractGenericElasticSearchMapStore.load(AbstractGenericElasticSearchMapStore.java:50)
at com.hazelcast.map.impl.MapStoreWrapper.load(MapStoreWrapper.java:165)
at com.hazelcast.map.impl.mapstore.writebehind.WriteBehindStore.load(WriteBehindStore.java:206)
at com.hazelcast.map.impl.mapstore.writebehind.WriteBehindStore.load(WriteBehindStore.java:56)
at com.hazelcast.map.impl.recordstore.DefaultRecordStore.putIfAbsent(DefaultRecordStore.java:1004)
at com.hazelcast.map.impl.operation.PutIfAbsentOperation.run(PutIfAbsentOperation.java:36)
at com.hazelcast.spi.Operation.call(Operation.java:170)
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.call(OperationRunnerImpl.java:210)
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:199)
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:147)
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:125)
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.run(OperationThread.java:110)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.net.URL]: No default constructor found; nested exception is java.lang.NoSuchMethodException: java.net.URL.<init>()
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:146)
at org.springframework.data.mapping.model.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:62)
... 54 common frames omitted
Caused by: java.lang.NoSuchMethodException: java.net.URL.<init>()
at java.lang.Class.getConstructor0(Class.java:3082)
at java.lang.Class.getDeclaredConstructor(Class.java:2178)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:139)
... 55 common frames omitted
任何有關決議的想法表示贊賞。
uj5u.com熱心網友回復：
這是因為您可能沒有任何將 URL 作為引數實體化的建構式。
在你的情況下，建構式應該是這樣的。
public Entity(URL url, ** **) {
this.url = url;
**;
**;
}
此外，您可以使用 Lombok 來獲取帶有 @NoArgsConstructor、@AllArgsConstructor、@Data 等注釋的建構式功能，只需將其添加到您的模型類中即可。
uj5u.com熱心網友回復：
從索引中的資料來看，該 URL 似乎存盤為url具有屬性protocol, host, port, file, authority, path, handler（它本身是一個物件）的嵌套物件。
在讀取 Spring Data Elasticsearch 嘗試創建類的物件URL以便在物件上設定這些屬性。但是URL該類沒有建構式來執行此操作。
要讀取它，您需要定義一個自定義轉換器，它可以讀取和寫入一個Document物件的 URL （它基本上是一個Map<String, Object>并注冊該轉換器（參見https://docs.spring.io/spring-data/elasticsearch/ docs/4.2.5/reference/html/#elasticsearch.mapping.meta-model.conversions）
轉載請註明出處，本文鏈接：https://www.uj5u.com/net/339658.html
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