Persisting Objects containing Objects with spring-data-mongodb

Below is a follow-up question to Question 13832188: I'm using `spring-data-mongodb` version `1.1.1.RELEASE`. I am able to persist an object if all the member variables are primitive types, even if the names of the `@PersistenceConstructor` arguments don't match exactly the names of the member variables by using the `@Field` and `@Value` annotations. However, I get a `MappingInstantiationException` when I try to persist objects that contain other objects. My questions: - Is this a bug in `spring-data-mongodb` or am I doing something wrong? - What needs to change so that I can properly persist objects containing objects? . ``` 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 ``` My `PrimitiveContainer` and `ObjectContainer` classes are listed below: ``` @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; } } ``` **UPDATE: ** Curiously, changing the string in the `@Field` annotation to something other than "property" or removing the `@Field` annotation entirely for the `ObjectContainer` `m_property` allows spring-data-mongo-db to property re-instantiate my persisted `ObjectContainer` class. I don't understand why this works. Anyone have any ideas?