使用spring-data-mongodb持久化包含对象的对象

Question

以下是对问题的后续问题：

我正在使用spring-data-mongodbversion
1.1.1.RELEASE。如果所有成员变量都是基本类型，即使@PersistenceConstructor使用@Field和@Value注释，参数的名称与成员变量的名称不完全匹配，我也可以保留该对象。

但是，MappingInstantiationException当我尝试保留包含其他对象的对象时，我得到了提示。我的问题：

• 这是错误，spring-data-mongodb还是我做错了什么？
• 为了使我可以正确地持久化包含对象的对象，需要进行哪些更改？

。

org.springframework.data.mapping.model.MappingInstantiationException: Could not instantiate bean class [com.recorder.TestRecorder2$ObjectContainer]: Illegal arguments for constructor; nested exception is java.lang.IllegalArgumentException: argument type mismatch
    at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:77)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:229)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:209)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:173)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:169)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:72)
    at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:1820)
    at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1542)
    at org.springframework.data.mongodb.core.MongoTemplate.findAll(MongoTemplate.java:1064)
    at com.recorder.TestRecorder2.testObjectContainer(RecorderTest2.java:63)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.recorder.TestRecorder2$ObjectContainer]: Illegal arguments for constructor; nested exception is java.lang.IllegalArgumentException: argument type mismatch
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:158)
    at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:75)
    ... 34 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
    ... 35 more

我PrimitiveContainer和ObjectContainer班级如下：

@Document
class PrimitiveContainer {

    @Field("property") 
    private final int m_property;

    @PersistenceConstructor
    public PrimitiveContainer(@Value("#root.property") int a_property) {
        m_property = a_property;
    }

    public int property() {
        return m_property;
    }
}

@Document
class ObjectContainer {

    @Field("property") 
    private final PrimitiveContainer m_property;

    @PersistenceConstructor
    public ObjectContainer(@Value("#root.property") PrimitiveContainer a_property) {
        m_property = a_property;
    }

    public PrimitiveContainer property() {
        return m_property;
    }
}

更新：奇怪的是，将@Field注释中的字符串更改为“属性”以外的内容，或者@Field完全删除注释以ObjectContainer
m_property允许spring-data-mongo-
db属性重新实例化我的持久化ObjectContainer类。我不明白为什么这样做。有人有主意吗？

Answer 1

您似乎发现了一个错误。第一次Spel表达式求值得到的值是a
DBObject，实际上没有转换为参数类型。我在本地已经有一些代码可以解决该问题。您介意针对Spring Data
MongoDB创建故障单以将其作为错误提交吗？