我的项目使用的是Spring数据mongodb . 在我对其中一个包含文档数组的字段的文档进行编辑之前，我没有遇到以下错误 . 它之前工作正常，但现在我一直得到以下错误 .
我更新的字段在Projects POJO类中是impapps . 我不知道如何清除这个错误尝试不同的东西，但没有成功 .
SEVERE: Servlet.service() for servlet [appServlet] in context with path [/mongodproject] threw exception [Request processing failed; nested exception is org.springframework.data.mapping.model.MappingInstantiationException: Could not instantiate bean class [java.util.List]: Specified class is an interface] with root cause
org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [java.util.List]: Specified class is an interface
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:101)
at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:60)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:232)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:212)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1008)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$100(MappingMongoConverter.java:75)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:957)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:713)
这是我的POJO和Spring Repository类 .
Project POJO Class
@Document(collection="releases")
public class Project {
@Id
private String id;
......
@Field("impapps")
private List<ImpactedApplications> impapps=new ArrayList<ImpactedApplications>();
.....getters/setters
}
ImpactedApplication POJO Class:
public class ImpactedApplications {
@Field("appid")
private String appId;
.....
@Field("repository")
private List<ScriptsRepo> rep=new ArrayList<ScriptsRepo>();
@Field("artifacts")
private List<Artifacts> artifacts=new ArrayList<Artifacts>();
//getter and setters
}
Artifacts POJO Class
public class Artifacts {
@Field("artifacttype")
private String artifactType;
@Field("documentlink")
private String documentLink;
@Field("arttestphase")
private String artTestPhase;
@Field("artifactname")
private ArtifactsEnums artifactsNames;
@Field("startdate")
private String startDate;
@Field("enddate")
private String endDate;
@Field("peerrev")
private boolean peerReview;
@Field("busrev")
private boolean busReview;
@Field("na")
private boolean na;
Spring Repository classes
public interface ProjectRepository extends Repository<Project, String> {
Project findById(String id);
List<Project> findByYearAndReleaseMonthNoOrderByProjectNameDesc(String year,String month, Sort sort);
Project findByYearAndReleaseMonthNoAndId(String year, String month,String id);
每当我调用上述方法时，我都会继续获得异常 .
Below is how my document is looking currently.
2 回答
文档中的
impapps字段不是数组，而是嵌套文档 . 因此，如果您将List<ImpactedApplications>更改为简单的ImpactedApplications，这应该是正常的 .我有同样的例外：
Try to declare your field like this :
我不喜欢这样做，但它对我有用 .
edit:
我的问题是由于聚合期间的展开操作 . 它将数组（在我的类中声明为List <>）转换为对象，然后反射不起作用，因为spring期待列表 .