Java 莫菲娅可以';整数列表的t映射列表
我有一个我正在研究的问题的简化示例。我试图加载一个包含数字数组的文档Java 莫菲娅可以';整数列表的t映射列表,java,mongodb,morphia,Java,Mongodb,Morphia,我有一个我正在研究的问题的简化示例。我试图加载一个包含数字数组的文档 { "_id" : ObjectId("570cf0167640ed9f8bcff8e7"), "matrix" : [ [ 42 ] ] } 为了创建所有索引,我调用org.mongodb.morphia.Datastore#ensureIndex()。据我所知,根据文档,我需要调用org.mongodb.morphia.morphia#m
{
"_id" : ObjectId("570cf0167640ed9f8bcff8e7"),
"matrix" : [
[
42
]
]
}
为了创建所有索引,我调用org.mongodb.morphia.Datastore#ensureIndex()
。据我所知,根据文档,我需要调用org.mongodb.morphia.morphia#map(Class…
,告诉morphia在哪些类上查找@索引
注释。如果没有Morphia#map(…)
应用程序运行良好(正如预期的那样,不会创建索引)。如果我添加Morphia#map(…)
我会得到一个异常
Exception in thread "main" java.lang.RuntimeException: java.lang.IllegalArgumentException: BasicBSONList can only work with numeric keys, not: [elementData]
at org.mongodb.morphia.mapping.EmbeddedMapper.fromDBObject(EmbeddedMapper.java:74)
at org.mongodb.morphia.mapping.Mapper.readMappedField(Mapper.java:772)
at org.mongodb.morphia.mapping.Mapper.fromDb(Mapper.java:230)
at org.mongodb.morphia.mapping.Mapper.fromDBObject(Mapper.java:191)
at org.mongodb.morphia.query.MorphiaIterator.convertItem(MorphiaIterator.java:134)
at org.mongodb.morphia.query.MorphiaIterator.processItem(MorphiaIterator.java:146)
at org.mongodb.morphia.query.MorphiaIterator.next(MorphiaIterator.java:117)
at org.mongodb.morphia.query.QueryImpl.asList(QueryImpl.java:150)
at it.test.Main.fails(Main.java:41)
at it.test.Main.main(Main.java:24)
Caused by: java.lang.IllegalArgumentException: BasicBSONList can only work with numeric keys, not: [elementData]
at org.bson.types.BasicBSONList._getInt(BasicBSONList.java:168)
at org.bson.types.BasicBSONList._getInt(BasicBSONList.java:160)
at org.bson.types.BasicBSONList.get(BasicBSONList.java:105)
at org.mongodb.morphia.mapping.MappedField.getDbObjectValue(MappedField.java:190)
at org.mongodb.morphia.converters.Converters.fromDBObject(Converters.java:121)
at org.mongodb.morphia.mapping.ValueMapper.fromDBObject(ValueMapper.java:20)
at org.mongodb.morphia.mapping.Mapper.readMappedField(Mapper.java:766)
at org.mongodb.morphia.mapping.Mapper.fromDb(Mapper.java:230)
at org.mongodb.morphia.mapping.EmbeddedMapper.readMapOrCollectionOrEntity(EmbeddedMapper.java:206)
at org.mongodb.morphia.mapping.EmbeddedMapper.readCollection(EmbeddedMapper.java:142)
at org.mongodb.morphia.mapping.EmbeddedMapper.fromDBObject(EmbeddedMapper.java:45)
... 9 more
有人能解释为什么显式调用map()会破坏Morphia吗
下面的exmaple重现了这个问题(只需添加org.mongodb.morphia:morphia:1.1.1作为依赖项)
package.test;
导入java.util.List;
导入org.bson.types.ObjectId;
导入org.mongodb.morphia.Datastore;
导入org.mongodb.morphia.morphia;
导入org.mongodb.morphia.dao.BasicDAO;
导入org.mongodb.morphia.query.QueryResults;
导入com.mongodb.MongoClient;
导入com.mongodb.MongoClientURI;
导入it.test.model.Doc;
公共班机{
私有静态最终字符串URI=”mongodb://localhost:27017";
私有静态最终字符串NAME=“test”;
私有静态最终MongoClient_URI=新MongoClient(URI+“/”+名称);
公共静态void main(字符串[]args){
Main Main=新Main();
main.works();
main.fails();
}
私有void失败(){
try(MongoClient client=新的MongoClient(client_URI)){
Morphia Morphia=新Morphia();
morphia.getMapper().getOptions().setStoreEmpties(true);
mapPackage(“it.test.model”);
查找(morphia,client,client_URI.getDatabase());
}
}
私人工程(){
try(MongoClient client=新的MongoClient(client_URI)){
Morphia Morphia=新Morphia();
morphia.getMapper().getOptions().setStoreEmpties(true);
//morphia.mapPackage(“it.test.model”);//错误的调用?
查找(morphia,client,client_URI.getDatabase());
}
}
私有void find(Morphia Morphia、MongoClient、String dbName){
Datastore Datastore=morphia.createDatastore(client,dbName);
BasicDAO=新的BasicDAO(Doc.class,数据存储);
QueryResults result=dao.find();
List rootEntities=result.asList();
System.out.println(“Found”+rootEntities.size()+“RootEntity文档”);
}
}
包装it.test.model;
导入java.util.List;
导入org.bson.types.ObjectId;
导入org.mongodb.morphia.annotations.Entity;
导入org.mongodb.morphia.annotations.Id;
@实体
公共类文件{
@身份证
私有ObjectId;
公共ObjectId getId(){
返回id;
}
public void setId(ObjectId id){
this.id=id;
}
私有列表矩阵;
公共列表getMatrix(){
收益矩阵;
}
公共无效集合矩阵(列表矩阵){
这个矩阵=矩阵;
}
}
如果您查看,您可以看到列表
工作正常。查看您的示例,我没有看到任何明显的错误,但我至少可以验证List
是否有效。您使用的是什么版本的Java驱动程序?它至少应该在3.x行。谢谢,司机是正确的提示!我只将Morphia指定为maven依赖项,这使我获得了mongo java驱动程序:3.0.2(Morphiapom.xml
中的默认依赖项。对于版本3.2.2
,它可以按预期工作。
package it.test;
import java.util.List;
import org.bson.types.ObjectId;
import org.mongodb.morphia.Datastore;
import org.mongodb.morphia.Morphia;
import org.mongodb.morphia.dao.BasicDAO;
import org.mongodb.morphia.query.QueryResults;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import it.test.model.Doc;
public class Main {
private static final String URI = "mongodb://localhost:27017";
private static final String NAME = "test";
private static final MongoClientURI CLIENT_URI = new MongoClientURI(URI + "/" + NAME);
public static void main(String[] args) {
Main main = new Main();
main.works();
main.fails();
}
private void fails() {
try (MongoClient client = new MongoClient(CLIENT_URI)) {
Morphia morphia = new Morphia();
morphia.getMapper().getOptions().setStoreEmpties(true);
morphia.mapPackage("it.test.model");
find(morphia, client, CLIENT_URI.getDatabase());
}
}
private void works() {
try (MongoClient client = new MongoClient(CLIENT_URI)) {
Morphia morphia = new Morphia();
morphia.getMapper().getOptions().setStoreEmpties(true);
// morphia.mapPackage("it.test.model"); // bad call?
find(morphia, client, CLIENT_URI.getDatabase());
}
}
private void find(Morphia morphia, MongoClient client, String dbName) {
Datastore datastore = morphia.createDatastore(client, dbName);
BasicDAO<Doc, ObjectId> dao = new BasicDAO<>(Doc.class, datastore);
QueryResults<Doc> result = dao.find();
List<Doc> rootEntities = result.asList();
System.out.println("Found " + rootEntities.size() + " RootEntity documents.");
}
}
package it.test.model;
import java.util.List;
import org.bson.types.ObjectId;
import org.mongodb.morphia.annotations.Entity;
import org.mongodb.morphia.annotations.Id;
@Entity
public class Doc {
@Id
private ObjectId id;
public ObjectId getId() {
return id;
}
public void setId(ObjectId id) {
this.id = id;
}
private List<List<Integer>> matrix;
public List<List<Integer>> getMatrix() {
return matrix;
}
public void setMatrix(List<List<Integer>> matrix) {
this.matrix = matrix;
}
}