org.neo4j.ogm.exception.MappingException: Error mapping GraphModel to instance of ***.ProjectGraph
虾米哥
阅读:1024
2021-03-31 14:11:46
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实例化知识图谱对象ProjectGraph.java 提示如下截图错误信息:
Exception in thread "main" org.neo4j.ogm.exception.MappingException: Error mapping GraphModel to instance of <package>.ProjectGraph
at org.neo4j.ogm.context.GraphEntityMapper.mapEntities(GraphEntityMapper.java:145)
at org.neo4j.ogm.context.GraphEntityMapper.map(GraphEntityMapper.java:117)
at org.neo4j.ogm.context.GraphEntityMapper.map(GraphEntityMapper.java:81)
at org.neo4j.ogm.session.delegates.ExecuteQueriesDelegate.executeAndMap(ExecuteQueriesDelegate.java:111)
at org.neo4j.ogm.session.delegates.ExecuteQueriesDelegate.query(ExecuteQueriesDelegate.java:82)
at org.neo4j.ogm.session.Neo4jSession.query(Neo4jSession.java:323)
Caused by: org.neo4j.ogm.exception.MappingException: Unable to instantiate class <package>.ProjectGraph
at org.neo4j.ogm.annotations.EntityFactory.instantiate(EntityFactory.java:137)
at org.neo4j.ogm.annotations.EntityFactory.instantiateObjectFromTaxa(EntityFactory.java:110)
at org.neo4j.ogm.annotations.EntityFactory.newObject(EntityFactory.java:61)
at org.neo4j.ogm.context.GraphEntityMapper.mapNodes(GraphEntityMapper.java:156)
at org.neo4j.ogm.context.GraphEntityMapper.mapEntities(GraphEntityMapper.java:142)
... 7 more
Caused by: java.lang.NoSuchMethodException: <package>.ProjectGraph.<init>()
at java.lang.Class.getConstructor0(Class.java:3082)
at java.lang.Class.getDeclaredConstructor(Class.java:2178)
at org.neo4j.ogm.annotations.EntityFactory.instantiate(EntityFactory.java:133)
... 11 more
造成的原因:ProjectGraph.java 需要没有任何属性的构造函数,补全ProjectGraph 没有任何属性的构造函数。
ProjectGraph.java 错误代码:
import java.util.List;
import org.neo4j.ogm.annotation.GraphId;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.Relationship;
/**
* 单位工程图谱对象
*
*
*/
@NodeEntity
@SuppressWarnings("serial")
public class ProjectGraph implements java.io.Serializable{
@GraphId
private Long id;
private String name;
private String sid;
@Relationship(type = "IndividualLicenseRelation")
private List<LicenseGraph> licenses;
@Relationship(type = "IndividualResponRelation")
private List<ResponGraph> respons;
@Relationship(type = "IndividualUnitRelation")
private List<UnitGraph> units;
//set 和 get 方法
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSid() {
return sid;
}
public void setSid(String sid) {
this.sid = sid;
}
public List<LicenseGraph> getLicenses() {
return licenses;
}
public void setLicenses(List<LicenseGraph> licenses) {
this.licenses = licenses;
}
public List<ResponGraph> getRespons() {
return respons;
}
public void setRespons(List<ResponGraph> respons) {
this.respons = respons;
}
public List<UnitGraph> getUnits() {
return units;
}
public void setUnits(List<UnitGraph> units) {
this.units = units;
}
public ProjectGraph(String name, String sid) {
this.name = name;
this.sid = sid;
}
}
ProjectGraph.java 修正后的代码:
import java.util.List;
import org.neo4j.ogm.annotation.GraphId;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.Relationship;
/**
* 单位工程图谱对象
*
*
*/
@NodeEntity
@SuppressWarnings("serial")
public class ProjectGraph implements java.io.Serializable{
@GraphId
private Long id;
private String name;
private String sid;
@Relationship(type = "IndividualLicenseRelation")
private List<LicenseGraph> licenses;
@Relationship(type = "IndividualResponRelation")
private List<ResponGraph> respons;
@Relationship(type = "IndividualUnitRelation")
private List<UnitGraph> units;
//set 和 get 方法
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSid() {
return sid;
}
public void setSid(String sid) {
this.sid = sid;
}
public List<LicenseGraph> getLicenses() {
return licenses;
}
public void setLicenses(List<LicenseGraph> licenses) {
this.licenses = licenses;
}
public List<ResponGraph> getRespons() {
return respons;
}
public void setRespons(List<ResponGraph> respons) {
this.respons = respons;
}
public List<UnitGraph> getUnits() {
return units;
}
public void setUnits(List<UnitGraph> units) {
this.units = units;
}
// 构造函数
public ProjectGraph() {
super();
}
public ProjectGraph(String name, String sid) {
this.name = name;
this.sid = sid;
}
}
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