Top 7 No Converter Found Capable Of Converting From Type Trust The Answer

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[Solved] Spring JPA :: No converter found capable of converting from type | SolveForum

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Summary of article content: Articles about [Solved] Spring JPA :: No converter found capable of converting from type | SolveForum Anjali Asks: Spring JPA :: No converter found capable of converting from type. I am using spring with JPA and trying to execute query using … …
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I am using spring with JPA and trying to execute query using @query with…
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[Solved] Spring JPA :: No converter found capable of converting from type | SolveForum

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Summary of article content: Articles about Spring Data JPA – How to Return DTOs from Native Queries ConverterNotFoundException: No converter found capable of converting from type [org.springframework.data.jpa.repository.query. …
Most searched keywords: Whether you are looking for Spring Data JPA – How to Return DTOs from Native Queries ConverterNotFoundException: No converter found capable of converting from type [org.springframework.data.jpa.repository.query. Returning DTOs from a native query with Spring Data JPA is a little harder than you might expect. But there are 2 good solutions for it.
Table of Contents:

Interface-based DTO projections

Class-based DTO projections

Conclusion

Spring Data JPA Query Projections

Native Queries with Spring Data JPA

Hibernate’s ResultTransformer in Hibernate 4 5 & 6

5 JPA Features That Are Easier To Use with Spring Data JPA

Ultimate Guide Custom Queries with Spring Data JPA’s @Query Annotation

Boost your Hibernate skills

Cheat Sheet10 Hibernate Mistakes That Cripple Your Performance

Spring Data JPA - How to Return DTOs from Native Queries — Spring Data JPA – How to Return DTOs from Native Queries

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Summary of article content: Articles about “No converter found capable of converting from type” in Spring Boot Starter Web project · Issue #40 · mapstruct/mapstruct-spring-extensions · GitHub “No converter found capable of converting from type” in Spring Boot Starter Web project #40. Closed. marvk opened this issue on Mar … …
Most searched keywords: Whether you are looking for “No converter found capable of converting from type” in Spring Boot Starter Web project · Issue #40 · mapstruct/mapstruct-spring-extensions · GitHub “No converter found capable of converting from type” in Spring Boot Starter Web project #40. Closed. marvk opened this issue on Mar … Related to #22 We’re trying to integrate mapstruct-spring-extensions into a project and hit a little bit of a roadblock. I was under the impression that, when defining a mapper, extending Converter and adding a @Mapper annotation would b…
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“No converter found capable of converting from type” in Spring Boot Starter Web project · Issue #40 · mapstruct/mapstruct-spring-extensions · GitHub

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Summary of article content: Articles about 스프링부트 native Query에러 No converter found capable of converting from type 데이터베이스 상에서는 쿼리가 잘 작동되어 값을 가져온것을 볼 수 있다. 에러 내용. No converter found capable of converting from type 2022-04-23 23 … …
Most searched keywords: Whether you are looking for 스프링부트 native Query에러 No converter found capable of converting from type 데이터베이스 상에서는 쿼리가 잘 작동되어 값을 가져온것을 볼 수 있다. 에러 내용. No converter found capable of converting from type 2022-04-23 23 … 나의 게시글 조회를 하기 위해 스프링부트에서 nativeQuery를 사용하게 되었다. 문제는 에러가 생기면서 쿼리의 값이 불러오지 않는 에러가 생김데이터베이스 상에서는 쿼리가 잘 작동되어 값을 가져온것을 볼 수 있다. No converter found capable o
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에러 내용

설정했던 코드

해결방법

스프링부트 native Query에러 No converter found capable of converting from type

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Summary of article content: Articles about No converter found capable of converting from t…anycodings The names must be enticals bese anycodings_java adding getters, setters to UsersXCountry @Query(value = “select count(‘1’) as numUsers, … …
Most searched keywords: Whether you are looking for No converter found capable of converting from t…anycodings The names must be enticals bese anycodings_java adding getters, setters to UsersXCountry @Query(value = “select count(‘1’) as numUsers, … No converter found capable of converting from type
I have this class:
public class UsersXCountry {

Integer numUs …
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Answers 1 of No converter found capable of converting from type

[Solved] Spring JPA :: No converter found capable of converting from type

Code: import SwiftUI import UniformTypeIdentifiers struct ContentView: View { @State var showImporter: Bool = false @State var stream: InputStream? @State var logs: [String] = [] @State var nodeMaxID: Int = 0 let queue = DispatchQueue.init(label: “Parser”, qos: .userInteractive, attributes: .concurrent, autoreleaseFrequency: .inherit, target: nil) var body: some View { VStack(alignment: .leading, spacing: 4) { HStack(){ Button(action: {showImporter = true}) { Text(“Open file”) } Spacer() } Text(“Node max ID: \(nodeMaxID)”) ScrollViewReader() { proxy in ScrollView(.vertical, showsIndicators: true) { VStack(alignment: .leading, spacing: 4) { ForEach(logs, id: \.self) { log in Text(log) .id(log) .onAppear{ withAnimation { proxy.scrollTo(log) } } } } } } } .padding() .frame(minWidth: 640, idealWidth: 1280, maxWidth: 1920, minHeight: 360, idealHeight: 720, maxHeight: 1080, alignment: .center) .fileImporter(isPresented: $showImporter, allowedContentTypes: [UTType.data]) { result in do { let url = try result.get() self.stream = InputStream(url: url) } catch { print(error.localizedDescription) } } .onChange(of: stream) { _ in if let stream = stream { parseData(from: stream) } } } var elements: [String] = [] func parseData(from inputStream: InputStream) { queue.asyncAfter(deadline: .now() + .seconds(1)) { var count = 0 let l = 128*1024*1024 let buf = UnsafeMutablePointer.allocate(capacity: l) var lastLine = “” var str = “” var lines: [String] = [] inputStream.open() while inputStream.hasBytesAvailable { logs.append(“[\(count)] Start read data to buffer”) let numberOfBytesRead = inputStream.read(buf, maxLength: l) if numberOfBytesRead < 0, let error = inputStream.streamError { print(error); break } logs.append("[\(count)] Start converting data to string") str = String(bytesNoCopy: buf, length: l, encoding: .utf8, freeWhenDone: false) ?? "" logs.append("[\(count)] Start separating string to lines") lines = (lastLine + str).components(separatedBy: " ").filter{$0.count > 3} lastLine = lines.removeLast() logs.append(“[\(count)] String buffer count: \(str.count), Lines count: \(lines.count)”) while !lines.isEmpty { var line = lines.removeFirst() while line.first ?? “@” == ” ” { line.removeFirst() } if line.first ?? “@” == “<" { line.removeFirst() } if line.last ?? "@" == ">” { line.removeLast() } var name = “” //print(line) while line.first ?? “@” != ” ” && !line.isEmpty { name.append(line.removeFirst())} if line.first ?? “@” == ” ” { line.removeFirst() } let array = line.components(separatedBy: “\” “) if array.count == 1 && name.first ?? “@” == “/” { name.removeFirst() didEndElement(name) } else { var attributes: [String: String] = [:] for item in array { var dic = item.components(separatedBy: “=\””) if dic.count == 2 { if dic[1].last ?? “@” == “/” { dic[1].removeLast() } if dic[1].last ?? “@” == “\”” { dic[1].removeLast() } attributes[dic[0]] = dic[1] } } didStartElement(name, attributes: attributes) if line.last ?? “@” == “/” { didEndElement(name) } } } str = “” count += 1 } inputStream.close() } } func didStartElement(_ name: String, attributes: [String: String]) { } func didEndElement(_ name: String) { } }

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diclonius9 Asks:Hello fellow developers!When developing a utility application for Mac OS, I encountered an incomprehensible memory leak effect, presumably when working with String type data. I will briefly describe the essence:For my main application, I need some data embedded directly into the assembly. These data need to be taken according to certain criteria from a very massive, I would even say “heavy as the sins of all mankind”, XML file type. The file is incredibly large. The volume exceeds 1.7 TB (i.e. 1700 gigabytes). The XMLParser() provided by Apple freezes at around 57 million lines. At the same time, the amount of RAM used by the application stops at 7-7.2 gigabytes with a physical limit of 8 gigabytes (my computer has an M1 chip and a RAM volume of 8 gigabytes). Therefore, it was decided to create a service application (without any frills like a beautiful interface) that performs only the task I need. And here’s a surprise! I ran into an even more interesting problem: the application works as much as possible, but about the third or fourth gigabyte of the file, the amount of memory used grows to 12-13 gigabytes (let me remind you about the physical limit of 8 gigabytes). It is clear that all the excess is merged into the swap file. But that doesn’t make it any easier. My patience lasted up to 20 gigabytes, then I completed the application. Maybe someone is interested – he will look and be able to figure out what the problem is. My brain is already broken. Here is the source code:Thank you in advance for any help.

No converter found capable of converting from type [java.lang.String] to type [java.util.Map]

java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java: 132 ) at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java: 123 ) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java: 118 ) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java: 83 ) at org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener.prepareTestInstance(SpringBootDependencyInjectionTestExecutionListener.java: 43 ) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java: 244 ) at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java: 98 ) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$ 5(ClassBasedTestDescriptor.java:337 ) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java: 342 ) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$ 6(ClassBasedTestDescriptor.java:337 ) at java.util.stream.ReferencePipeline$ 3$1.accept(ReferencePipeline.java:193 ) at java.util.stream.ReferencePipeline$ 2$1.accept(ReferencePipeline.java:175 ) at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java: 1382 ) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java: 481 ) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java: 471 ) at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java: 312 ) at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java: 743 ) at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java: 742 ) at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java: 580 ) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java: 336 ) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java: 259 ) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$ 2(ClassBasedTestDescriptor.java:252 ) at java.util.Optional.orElseGet(Optional.java: 267 ) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$ 3(ClassBasedTestDescriptor.java:251 ) at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java: 29 ) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$ 0(TestMethodTestDescriptor.java:106 ) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java: 73 ) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java: 105 ) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java: 69 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$ 1(NodeTestTask.java:107 ) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java: 73 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java: 107 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java: 75 ) at java.util.ArrayList.forEach(ArrayList.java: 1257 ) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java: 38 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$ 5(NodeTestTask.java:139 ) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java: 73 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$ 7(NodeTestTask.java:125 ) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java: 135 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$ 8(NodeTestTask.java:123 ) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java: 73 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java: 122 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java: 80 ) at java.util.ArrayList.forEach(ArrayList.java: 1257 ) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java: 38 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$ 5(NodeTestTask.java:139 ) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java: 73 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$ 7(NodeTestTask.java:125 ) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java: 135 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$ 8(NodeTestTask.java:123 ) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java: 73 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java: 122 ) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java: 80 ) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java: 32 ) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java: 57 ) at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java: 51 ) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java: 229 ) at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$ 6(DefaultLauncher.java:197 ) at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java: 211 ) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java: 191 ) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java: 128 ) at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java: 69 ) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java: 47 ) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java: 242 ) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java: 70 ) Caused by: org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under ‘logging.level’ to java.util.Map at org.springframework.boot.context.properties.bind.Binder.handleBindError(Binder.java: 364 ) at org.springframework.boot.context.properties.bind.Binder.bind(Binder.java: 324 ) at org.springframework.boot.context.properties.bind.Binder.bind(Binder.java: 308 ) at org.springframework.boot.context.properties.bind.Binder.bind(Binder.java: 238 ) at org.springframework.boot.context.properties.bind.Binder.bind(Binder.java: 212 ) at org.springframework.boot.context.logging.LoggingApplicationListener.setLogLevels(LoggingApplicationListener.java: 398 ) at org.springframework.boot.context.logging.LoggingApplicationListener.initializeFinalLoggingLevels(LoggingApplicationListener.java: 338 ) at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java: 289 ) at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java: 246 ) at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java: 223 ) at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java: 172 ) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java: 165 ) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java: 139 ) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java: 127 ) at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java: 76 ) at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java: 53 ) at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java: 345 ) at org.springframework.boot.SpringApplication.run(SpringApplication.java: 308 ) at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java: 125 ) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java: 99 ) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java: 124 ) … 64 more Caused by: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [java.util.Map ] at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java: 321 ) at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java: 194 ) at org.springframework.boot.context.properties.bind.BindConverter$CompositeConversionService.convert(BindConverter.java: 170 ) at org.springframework.boot.context.properties.bind.BindConverter.convert(BindConverter.java: 96 ) at org.springframework.boot.context.properties.bind.BindConverter.convert(BindConverter.java: 88 ) at org.springframework.boot.context.properties.bind.MapBinder.bindAggregate(MapBinder.java: 64 ) at org.springframework.boot.context.properties.bind.AggregateBinder.bind(AggregateBinder.java: 56 ) at org.springframework.boot.context.properties.bind.Binder.lambda$bindAggregate$ 3(Binder.java:415 ) at org.springframework.boot.context.properties.bind.Binder$Context.withIncreasedDepth(Binder.java: 570 ) at org.springframework.boot.context.properties.bind.Binder$Context.access$ 100(Binder.java:513 ) at org.springframework.boot.context.properties.bind.Binder.bindAggregate(Binder.java: 415 ) at org.springframework.boot.context.properties.bind.Binder.bindObject(Binder.java: 376 ) at org.springframework.boot.context.properties.bind.Binder.bind(Binder.java: 320 ) … 83 more

Spring Data JPA – How to Return DTOs from Native Queries

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When using Spring Data JPA, you are used to derived and custom queries that return the result in your preferred format. A typical example is a DTO projection, which is the most efficient one for read-only operations. To use it in a derived or custom JPQL query, you only need to change the return type of your repository method to your DTO class or interface. But when using a native query, some limitations make DTOs a little harder to use.

In this article, I will show you how to use interface-based DTO projections, the problem when using class-based DTO projections and how to use them anyway.

Interface-based DTO projections

Let’s start with the good news: You can use an interface-based DTO projection with a native query in the same way you use it with a derived or custom JPQL query. The only thing you need to take care off is the alias of each column.

You first need to define an interface that defines a getter method for each attribute your projection shall contain. At runtime, Spring Data JPA then generates a class that implements that interface.

public interface PlayerName { String getFirstName(); String getLastName(); }

You can then use that interface as the return type of a repository method. To assign a native query to that method, you need to annotate it with @Query, provide the native SQL statement, and set the native attribute to true.

public interface ChessPlayerRepository extends JpaRepository { @Query(value = “SELECT p.first_name as firstName, p.last_name as lastName FROM Chess_Player p WHERE id = :id”, nativeQuery = true) PlayerName findPlayerNameById(Long id); }

When you define the query, you should double-check if the alias of each column can get mapped to the corresponding getter method. In my example, I’m using snake case for the database columns, and Spring Data JPA wouldn’t be able to map that to the getter methods, which are in camel case. I, therefore, defined an alias in camel case for each column. Spring Data JPA then handles the mapping of the query result to the generated implementation of the interface automatically. If it can’t find a matching alias for a getter method, a call of that method returns null.

Class-based DTO projections

Even though Spring Data JPA is more flexible, the JPA specification only supports class-based DTO projections. It requires a Java class with a constructor that initializes all attributes you want to use.

public class PlayerNameDto { private String firstName; private String lastName; public PlayerNameDto(String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } public String getFirstName() { return firstName; } public String getLastName() { return lastName; } }

You can easily use this class as a projection in derived queries and custom JPQL queries. Your custom query needs to use a constructor expression that defines the constructor you want to call. Spring Data JPA generates such an expression when deriving the query statement from the method name.

The Automatic Mapping Doesn’t Work

Unfortunately, you can’t rely on Spring Data JPA’s automatic mapping feature when using a native query. It throws a ConverterNotFoundException similar to the following one:

org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap] to type [com.thorben.janssen.spring.data.model.PlayerNameDto]
You have 2 options to avoid this exception:

Define and reference a @NamedNativeQuery with an @SqlResultSetMapping. Use a fragment interface to provide your own implementation of a repository method.

Fragment interfaces are by far the most flexible approach to add your own functionality to a repository. It enables you to provide your own implementation using all features and APIs defined by the JPA specification and provided by your persistence provider. But it also adds unnecessary complexity to your project if you only want to use a class-based DTO projection. Because of that, I will not show this approach in this article. If you want to learn more about fragment interfaces, please read my article on composite repositories.

Defining a @NamedNativeQuery and an @SqlResultSetMapping is by far the easier approach and the one I want to show you in this article.

@NamedNativeQuery with an @SqlResultSetMapping

As explained in a previous article, for every repository method not annotated with @Query, Spring Data JPA checks if there is a named query with a name that follows the pattern .. If it finds a @NamedQuery or @NamedNativeQuery with that name, it instantiates and executes that query instead of deriving the statement from the method name.

I use that feature in the following repository definition to execute a @NamedNativeQuery with the name ChessPlayer.findPlayerNameDtoById_Named.

public interface ChessPlayerRepository extends JpaRepository { @Query(nativeQuery = true) PlayerNameDto findPlayerNameDtoById_Named(Long id); }

I defined that query together with a constructor result mapping on my ChessPlayer entity class.

@NamedNativeQuery(name = “ChessPlayer.findPlayerNameDtoById_Named”, query = “SELECT p.first_name as first, p.last_name as last FROM Chess_Player p WHERE id = :id”, resultSetMapping = “Mapping.PlayerNameDto”) @SqlResultSetMapping(name = “Mapping.PlayerNameDto”, classes = @ConstructorResult(targetClass = PlayerNameDto.class, columns = {@ColumnResult(name = “first”), @ColumnResult(name = “last”)})) @Entity public class ChessPlayer { … }

As I explained in great detail in a series of articles, the @SqlResultSetMapping annotation enables you to define the mapping of a native query result to entities, DTOs, scalar values, and any combination of these three. In this case, I use it to define a constructor call of my PlayerNameDto class and tell Hibernate to provide the columns first and last of the result set as parameters.

You can reference an @SqlResultSetMapping in the definition of your @NamedNativeQuery. The mapping gets automatically applied to the result set when you instantiate and execute the query. That’s also the case when Spring Data JPA executes this query when you call the corresponding repository method. This is the easiest option to use a class-based DTO project with a native query.

Conclusion

As I showed in this article, you can easily use Spring Data JPA’s interface-based DTO projections with native queries. You only need to set the interface as the return type of the repository method that executes the native query.

Spring Data JPA doesn’t provide an automatic mapping of class-based DTOs for native queries. The easiest way to use this projection is to define your query as a @NamedNativeQuery and assign an @SqlResultSetMapping that defines a constructor result mapping. The instantiation of the DTO objects is then handled by the underlying persistence provider when Spring Data JPA executes the @NamedNativeQuery.

So you have finished reading the no converter found capable of converting from type topic article, if you find this article useful, please share it. Thank you very much. See more: Spring Converter, Projection Spring Data JPA, No converter found capable of converting from type java lang long to type java time instant, Failed to convert from type (java lang Object to type), No converter found capable of converting from type org bson types ObjectId to type java lang Long, Count Spring Data JPA, JpaRepository, Spring Data JPA configuration

Top 7 No Converter Found Capable Of Converting From Type Trust The Answer

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