I just clone http://github.com/SpringSource/sprin...t-examples.git.
I want to test push a pojo to a collection, so i modified a testcase in SimpleMongoTest in spring-data-mongodb-examples-hello project. When I run it ,it throw an exception:
java.lang.IllegalArgumentException: can't serialize class org.springframework.data.mongodb.examples.hello.do main.Account
at org.bson.BSONEncoder._putObjectField(BSONEncoder.j ava:213)
at org.bson.BSONEncoder.putMap(BSONEncoder.java:253)
at org.bson.BSONEncoder._putObjectField(BSONEncoder.j ava:179)
at org.bson.BSONEncoder.putObject(BSONEncoder.java:12 3)
at org.bson.BSONEncoder.putObject(BSONEncoder.java:69 )
at com.mongodb.OutMessage.putObject(OutMessage.java:1 89)
at com.mongodb.DBApiLayer$MyCollection.update(DBApiLa yer.java:333)
at com.mongodb.DBCollection.update(DBCollection.java: 145)
at com.mongodb.DBCollection.updateMulti(DBCollection. java:169)
at org.springframework.data.document.mongodb.MongoTem plate$13.doInCollection(MongoTemplate.java:846)
at org.springframework.data.document.mongodb.MongoTem plate$13.doInCollection(MongoTemplate.java:842)
at org.springframework.data.document.mongodb.MongoTem plate.execute(MongoTemplate.java:315)
at org.springframework.data.document.mongodb.MongoTem plate.updateMulti(MongoTemplate.java:842)
at org.springframework.data.document.mongodb.MongoTem plate.updateMulti(MongoTemplate.java:835)
at org.springframework.data.mongodb.examples.hello.Si mpleMongoTest.updatingDocuments(SimpleMongoTest.ja va:135)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runRefle ctiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallabl e.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExpl osively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod .evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.e valuate(RunBefores.java:28)
at org.springframework.test.context.junit4.statements .RunBeforeTestMethodCallbacks.evaluate(RunBeforeTe stMethodCallbacks.java:74)
at org.springframework.test.context.junit4.statements .RunAfterTestMethodCallbacks.evaluate(RunAfterTest MethodCallbacks.java:82)
at org.springframework.test.context.junit4.statements .SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUni t4ClassRunner.runChild(SpringJUnit4ClassRunner.jav a:240)
at org.junit.runners.BlockJUnit4ClassRunner.runChild( BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner. java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRu nner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentR unner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRu nner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRu nner.java:184)
at org.springframework.test.context.junit4.statements .RunBeforeTestClassCallbacks.evaluate(RunBeforeTes tClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements .RunAfterTestClassCallbacks.evaluate(RunAfterTestC lassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.ja va:236)
at org.springframework.test.context.junit4.SpringJUni t4ClassRunner.run(SpringJUnit4ClassRunner.java:180 )
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestR eference.run(JUnit4TestReference.java:49)
at org.eclipse.jdt.internal.junit.runner.TestExecutio n.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRu nner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRu nner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRu nner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRu nner.main(RemoteTestRunner.java:197)


this is the test case,
Code:
@Test
	public void updatingDocuments() {

		Person p1 = new Person("Bob", 33);
		p1.addAccount(new Account("198-998-2188", Account.Type.SAVINGS, 123.55d));
		mongoTemplate.insert(p1);
		Person p2 = new Person("Mary", 25);
		p2.addAccount(new Account("860-98107-681", Account.Type.CHECKING, 400.51d));
		mongoTemplate.insert(p2);
		Person p3 = new Person("Chris", 68);
		p3.addAccount(new Account("761-002-8901", Account.Type.SAVINGS, 10531.00d));
		mongoTemplate.insert(p3);
		Person p4 = new Person("Janet", 33);
		p4.addAccount(new Account("719-100-0019", Account.Type.SAVINGS, 1209.10d));
		mongoTemplate.insert(p4);
		
		assertEquals(4, mongoTemplate.getCollection("MyCollection").count());
		
//		WriteResult wr = mongoTemplate.updateMulti(
//				new Query(where("accounts.accountType").not().is(Account.Type.SAVINGS)),
//				new Update().inc("accounts.$.balance", 50.00));
		
		WriteResult wr = mongoTemplate.updateMulti(
		new Query(where("accounts.accountType").not().is(Account.Type.SAVINGS)),
		new Update().push("account", new Account("123", Account.Type.SAVINGS, 12345d)));
		
		System.out.println(wr);
		assertNotNull(wr);
		assertEquals(3, wr.getN());	
	}
this is my line:
Code:
WriteResult wr = mongoTemplate.updateMulti(
		new Query(where("accounts.accountType").not().is(Account.Type.SAVINGS)),
		new Update().push("account", new Account("123", Account.Type.SAVINGS, 12345d)));
i use mongo-java-driver 2.5.3, and spring.data.mongo 1.0.0.M2

thanks for help