我有两个类，其中类a有一个非空字段，它是类b的一个。
现在我希望在类b中有一个字段连接到一个类a示例。
例如，假设一个人正在从图书馆拿书。每本书对用户来说都有一个OneOne，而且不会改变；但是，用户有一个字段只连接到一本名为 CurrentlyReadingBook 这可能会改变。
最初将person对象存储到book的user字段中的onetoone是可以的，但是当我尝试将book存储到person对象中的onetoone时，我得到了一个stackoverflow错误，我假设这是由于两个类只是来回调用，试图无限获取数据。
所以我想知道，如果我想做的只是使用2个单独的表/类是可能的？我考虑过用一个表c，然后把信息放进去，或者只存储图书的id而不是图书对象本身，但是我觉得这两个方法是没有必要的，我认为应该有一种方法，只使用我拥有的两个表/类。
非常感谢您提供的任何信息/帮助。
这里是错误的情况下，这有助于在某种程度上

Info:   Exception Description: Unable to deploy PersistenceUnit [PersistenceUnitA] in invalid state [DeployFailed].
Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28019] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Deployment of PersistenceUnit [PersistenceUnitA] failed. Close all factories for this PersistenceUnit.
Internal Exception: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.IntegrityException
Descriptor Exceptions: 
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Exception [EclipseLink-168] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Problem in creating new instance using the default constructor.  The default constructor triggered an exception.
Internal Exception: java.lang.reflect.InvocationTargetException
Target Invocation Exception: java.lang.StackOverflowError
Descriptor: RelationalDescriptor(A --> [DatabaseTable(A)])
Exception [EclipseLink-168] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Problem in creating new instance using the default constructor.  The default constructor triggered an exception.
Internal Exception: java.lang.reflect.InvocationTargetException
Target Invocation Exception: java.lang.StackOverflowError
Descriptor: RelationalDescriptor(B --> [DatabaseTable(B)])
Exception [EclipseLink-168] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Problem in creating new instance using the default constructor.  The default constructor triggered an exception.
Internal Exception: java.lang.reflect.InvocationTargetException
Target Invocation Exception: java.lang.StackOverflowError
Descriptor: RelationalDescriptor(C --> [DatabaseTable(C)])
Exception [EclipseLink-168] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Problem in creating new instance using the default constructor.  The default constructor triggered an exception.
Internal Exception: java.lang.reflect.InvocationTargetException
Target Invocation Exception: java.lang.StackOverflowError
Descriptor: RelationalDescriptor(D --> [DatabaseTable(D)])
Runtime Exceptions: 
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