Java 可嵌入到Datanucleus中
我有以下模型类：Java 可嵌入到Datanucleus中,java,jpa,datanucleus,Java,Jpa,Datanucleus,我有以下模型类： @Entity public class A { private B b; } @Embeddable public class B { ... } 我使用的是SpringMVC，控制器用@Transactional注释，我指定了以下datanucleus属性（以及其他属性） 在视图（JSP）中，当事务应该结束并分离对象时，如果我尝试访问${a.b.whatever}我会得到这个错误 javax.jdo.JDODetachedFieldAccessE
@Entity
public class A {
private B b;
}
@Embeddable
public class B {
...
}
${a.b.whatever}javax.jdo.JDODetachedFieldAccessException: You have just attempted to access field "b" yet this field was not detached when you detached the object. Either dont access this field, or detach it when detaching the object.
A.jdoGetb(A.java)
A.getB(A.java)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
javax.el.BeanELResolver.getValue(BeanELResolver.java:62)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
org.apache.el.parser.AstValue.getValue(AstValue.java:123)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:935)
@Basic(fetch=FetchType.EAGER)
private B b;
@Basic(fetch=FetchType.EAGER)
private B b;