Spring-boot 項目中使用 jackson 遇到的一個問題

jackson介紹

　　java代碼中實現序列化和反序列化的工具類

jackson使用Demo

　　https://github.com/Naylor55/JavaDebrisCode/tree/branch_Java-Serializable/javaserializable

Ideal控制檯報錯信息

2019-05-22 15:43:20.333 [main] ERROR org.springframework.boot.SpringApplication.reportFailure:837 - Application run failed
java.lang.AbstractMethodError: com.fasterxml.jackson.core.type.ResolvedType.getReferencedType()Lcom/fasterxml/jackson/core/type/ResolvedType;
	at com.fasterxml.jackson.core.type.ResolvedType.isReferenceType(ResolvedType.java:59)
	at com.fasterxml.jackson.datatype.jdk8.Jdk8TypeModifier.modifyType(Jdk8TypeModifier.java:20)
	at com.fasterxml.jackson.databind.type.TypeFactory._constructType(TypeFactory.java:413)
	at com.fasterxml.jackson.databind.type.TypeFactory.constructType(TypeFactory.java:354)
	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.getJavaType(AbstractJackson2HttpMessageConverter.java:323)
	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.canRead(AbstractJackson2HttpMessageConverter.java:158)
	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.canRead(AbstractJackson2HttpMessageConverter.java:150)
	at org.springframework.web.client.RestTemplate$AcceptHeaderRequestCallback.doWithRequest(RestTemplate.java:805)
Disconnected from the target VM, address: '127.0.0.1:57769', transport: 'socket'
	at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:868)
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:685)
	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:644)
	at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:564)
	at org.springframework.cloud.config.client.ConfigServicePropertySourceLocator.getRemoteEnvironment(ConfigServicePropertySourceLocator.java:218)
	at org.springframework.cloud.config.client.ConfigServicePropertySourceLocator.locate(ConfigServicePropertySourceLocator.java:96)
	at org.springframework.cloud.bootstrap.config.PropertySourceBootstrapConfiguration.initialize(PropertySourceBootstrapConfiguration.java:94)
	at org.springframework.boot.SpringApplication.applyInitializers(SpringApplication.java:628)
	at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:364)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:305)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1242)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1230)
	at com.leading.WarehouseserviceApplication.main(WarehouseserviceApplication.java:50)

　　

 

報錯緣由

　　Spring-Boot框架自身默認就引用了jackson，若是你在本身的開發項目中再次引用，就會有衝突。然而，JVM 不會告訴你是引用有衝突，而是直接給你一個類型有問題的提示。意思就是我只能告訴你類型有問題，具體的你本身查吧。IDEAL 做爲一個開發工具，在這點上面也沒有作出點貢獻。Java這個生態缺陷仍是很大的！！！

　　spriing-boot 默認引用

　　本身項目的pom中找到：org.springframework.boot ， 並點擊進去。

　　　　 <parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.6.RELEASE</version>
		<relativePath />
	</parent>

　　而後再找：spriing-boot-dependencies ，並點擊進去

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.0.6.RELEASE</version>
        <relativePath>../../spring-boot-dependencies</relativePath>
    </parent>

　　而後就能夠看到spring-boot 對jackson 的引用，以下圖

　　

 

解決辦法

　　在當前開發項目的pom文件中刪除對jackson的依賴，即刪除以下圖所示