关于后台向前台返回json时,无限循环的解决办法

本文详细解析了在Spring框架下,由于实体类间双向引用导致的JSON转换无限循环错误。通过具体案例,阐述了错误产生的原因,并提供了解决方案,即在实体类上使用注解来排除递归字段。

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15:04:05.209 ERROR org.apache.juli.logging.DirectJDKLog 175 log - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Infinite recursion (StackOverflowError); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError) (through reference chain: com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”]->com.miyu.mfmsserver.model.entity.MfmsToolTypeEntity[“mfmsTools”]->org.hibernate.collection.internal.PersistentBag[0]->com.miyu.mfmsserver.model.entity.MfmsToolEntity[“mfmsToolType”])] with root cause java.lang.StackOverflowError: null
15:04:05.239 ERROR org.apache.juli.logging.DirectJDKLog 175 log - Exception Processing ErrorPage[errorCode=0, location=/error] org.apache.catalina.connector.ClientAbortException: java.io.IOException: 你的主机中的软件中止了一个已建立的连接。

反正,是超级超级长的错误…
主要原因是 在我的toolType实体类中,有关于tool的一对多的Collection,在tool实体类中,也有关于toolType的一对多映射,所以在转换成json时,就出现了死循环。
解决办法: 在实体类上加上注解
在这里插入图片描述
在这里插入图片描述
其中,value值为需要在转换为json时忽略掉的属性。

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