org.neo4j.ogm.exception.MappingException: Error mapping GraphModel to instance of ***.ProjectGraph

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>.ProjectGraphat 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>.ProjectGraphat 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{@GraphIdprivate 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{@GraphIdprivate 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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org.neo4j.ogm.exception.MappingException: Error mapping GraphModel to instance of ***.ProjectGraph

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