我是一个经典的春季网络应用程序，带有一些spring crud存储库。
我试图以经典的角度形式保存我的实体，并且我随机获得此错误：
.w.s.m.s.DefaultHandlerExceptionResolver : Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: No _valueDeserializer assigned
at [Source: java.io.PushbackInputStream@11936b0f; line: 1, column: 19] (through reference chain: com.adeo.volt.domain.HalfFlow["exchange"]->com.adeo.volt.domain.Exchange["id"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No _valueDeserializer assigned
at [Source: java.io.PushbackInputStream@11936b0f; line: 1, column: 19] (through reference chain: com.adeo.volt.domain.HalfFlow["exchange"]->com.adeo.volt.domain.Exchange["id"])
这是我的发言Json：
{
"exchange": {
"id": 305,
"processExchange": [],
"number": 305,
"halfFlows": [],
"name": "TEST2",
"type": {
"id": 2,
"name": "real-time"
},
"technology": {
"id": 1,
"name": "ESB webMethods"
},
"exchangesObjectsExchanges": [{
"id": 235,
"exchangeObject": {
"id": 180,
"name": "TESTALEXX",
"objectMeaning": "t",
"internalReferent": "t",
"internalBusinessReferent": null,
"status": {
"id": 1,
"name": "Study In Progress"
},
"type": {
"id": 1,
"name": "Canonical"
},
"externalDocLink": null,
"keywords": null,
"qualityScore": null
}
}]
},
"way": {
"id": 1,
"name": "TO"
},
"halfFlowApplication": [{
"application": {
"id": 2,
"name": "ADEXIOCRE2",
"type": {
"id": 1,
"name": "INTERNAL"
},
"domain": {
"id": 6,
"name": "Logistics",
"letter": "L"
},
"vendor": null,
"projectName": null,
"internalReferent": null,
"groupApplicationType": {
"id": 2,
"name": "MULTI INSTANCE"
},
"halfFlowApplication": [{
"id": 159
}]
}
}],
"halfFlowNumber": "L0305A",
"name": "TEST2_TO_ADEXIOCRE2",
"halfFlowBus": [{
"bu": {
"id": 10,
"number": 10,
"shortLabel": "BCIT",
"longLabel": "BC ITALIE"
},
"id": null
}],
"connector": {
"id": 4,
"name": "FTP"
}
}
这是我的课程：
Exchange.java
@Entity
public class Exchange {
@Id
@Column(unique = true, nullable = false)
@GenericGenerator(name = "ExchangeGenerator", strategy = "increment")
@GeneratedValue(generator = "ExchangeGenerator")
private Long id;
@Column(unique = true)
private String name;
private int number;
private long technologyId;
private long exchangeTypeId;
@OneToMany(mappedBy = "exchange")
private List<Halfflow> halfFlows;
public Exchange() {
}
/* Getters and Setters */
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 int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public long getTechnologyId() {
return technologyId;
}
public void setTechnologyId(long technologyId) {
this.technologyId = technologyId;
}
public long getExchangeTypeId() {
return exchangeTypeId;
}
public void setExchangeTypeId(Long exchangeTypeId) {
this.exchangeTypeId = exchangeTypeId;
}
public void setExchangeTypeId(long exchangeTypeId) {
this.exchangeTypeId = exchangeTypeId;
}
public List<Halfflow> getHalfFlows() {
return halfFlows;
}
public void setHalfFlows(List<Halfflow> halfFlows) {
this.halfFlows = halfFlows;
}
@Override
public String toString() {
return "Exchange{" +
"id=" + id +
", name='" + name + '\'' +
", number=" + number +
", technologyId=" + technologyId +
'}';
}
}
Halfflow.java
@Entity
@Table(name="HALF_FLOW")
public class HalfFlow {
@Id
@Column(name = "ID", unique = true, nullable = false)
@GenericGenerator(name = "HalfflowGenerator", strategy = "increment")
@GeneratedValue(generator = "HalfflowGenerator")
@JsonProperty(value="id")
private Long id;
@Column(unique = true)
@JsonProperty(value="halfFlowNumber")
private String halfFlowNumber;
@JsonProperty(value="name")
private String name;
@ManyToOne
@JoinColumn(name = "WAY_ID")
private Way way;
@JsonProperty(value="externalDocLink")
private String externalDocLink;
@ManyToOne
@JoinColumn(name = "HALF_FLOW_MODE_ID")
@JsonProperty(value="mode")
private HalfFlowMode mode;
@JsonProperty(value="internalReferent")
private String internalReferent;
@JsonProperty(value="backupReferent")
private String backupReferent;
@ManyToOne
@JoinColumn(name = "DATA_FORMAT_ID")
@JsonProperty(value="format")
private DataFormat format;
@ManyToOne
@JoinColumn(name = "CONNECTOR_ID")
@JsonProperty(value="connector")
private Connector connector;
@ManyToOne
@JoinColumn(name = "CONFIDENTIALITY_ID")
@JsonProperty(value="confidentiality")
private Confidentiality confidentiality;
@ManyToOne
@JoinColumn(name = "INTEGRITY_ID")
@JsonProperty(value="integrity")
private Integrity integrity;
@ManyToOne
@JoinColumn(name="HALF_FLOW_AVAILABILITY_ID")
@JsonProperty(value="halfFlowAvailability")
private HalfFlowAvailability halfFlowAvailability;
@JsonIgnoreProperties(value = {"halfFlow"})
@OneToMany(mappedBy = "halfFlow")
@JsonProperty(value="halfFlowApplication")
private List<HalfFlowApplication> halfFlowApplication;
@OneToMany(mappedBy = "halfFlow")
@JsonProperty(value="halfFlowBus")
private List<HalfFlowBu> halfFlowBus;
@OneToMany(mappedBy = "halfFlow")
@JsonProperty(value="serviceHalfFlow")
private Set<ServiceHalfFlow> serviceHalfFlow;
@JsonIgnoreProperties(value = {"halfFlows"})
@ManyToOne
@JoinColumn(name="EXCHANGE_ID")
@JsonProperty(value="exchange")
private Exchange exchange;
@JsonProperty(value="bridge")
private boolean bridge;
public HalfFlow() {
}
public HalfFlow(String halfFlowNumber, String name) {
this.halfFlowNumber = halfFlowNumber;
this.name = name;
}
public HalfFlow(Long id, String halfFlowNumber, String name) {
this.id = id;
this.halfFlowNumber = halfFlowNumber;
this.name = name;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
HalfFlow halfFlow = (HalfFlow) o;
if (id != null ? !id.equals(halfFlow.id) : halfFlow.id != null) return false;
return name != null ? name.equals(halfFlow.name) : halfFlow.name == null;
}
@Override
public int hashCode() {
int result = id != null ? id.hashCode() : 0;
result = 31 * result + (name != null ? name.hashCode() : 0);
return result;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getHalfFlowNumber() {
return halfFlowNumber;
}
public void setHalfFlowNumber(String halfFlowNumber) {
this.halfFlowNumber = halfFlowNumber;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Way getWay() {
return way;
}
public void setWay(Way way) {
this.way = way;
}
public String getExternalDocLink() {
return externalDocLink;
}
public void setExternalDocLink(String externalDocLink) {
this.externalDocLink = externalDocLink;
}
public HalfFlowMode getMode() {
return mode;
}
public void setMode(HalfFlowMode mode) {
this.mode = mode;
}
public String getInternalReferent() {
return internalReferent;
}
public void setInternalReferent(String internalReferent) {
this.internalReferent = internalReferent;
}
public String getBackupReferent() {
return backupReferent;
}
public void setBackupReferent(String backupReferent) {
this.backupReferent = backupReferent;
}
public DataFormat getFormat() {
return format;
}
public void setFormat(DataFormat format) {
this.format = format;
}
public Connector getConnector() {
return connector;
}
public void setConnector(Connector connector) {
this.connector = connector;
}
public Confidentiality getConfidentiality() {
return confidentiality;
}
public void setConfidentiality(Confidentiality confidentiality) {
this.confidentiality = confidentiality;
}
public Integrity getIntegrity() {
return integrity;
}
public void setIntegrity(Integrity integrity) {
this.integrity = integrity;
}
public HalfFlowAvailability getHalfFlowAvailability() {
return halfFlowAvailability;
}
public void setHalfFlowAvailability(HalfFlowAvailability halfFlowAvailability) {
this.halfFlowAvailability = halfFlowAvailability;
}
public List<HalfFlowApplication> getHalfFlowApplication() {
return halfFlowApplication;
}
public void setHalfFlowApplication(List<HalfFlowApplication> halfFlowApplication) {
this.halfFlowApplication = halfFlowApplication;
}
public Exchange getExchange() {
return exchange;
}
public void setExchange(Exchange exchange) {
this.exchange = exchange;
}
public Set<ServiceHalfFlow> getServiceHalfFlow() {
return serviceHalfFlow;
}
public void setServiceHalfFlow(Set<ServiceHalfFlow> serviceHalfFlow) {
this.serviceHalfFlow = serviceHalfFlow;
}
public List<HalfFlowBu> getHalfFlowBus() {
if (halfFlowBus != null)
Collections.sort(halfFlowBus);
return halfFlowBus;
}
public void setHalfFlowBus(List<HalfFlowBu> halfFlowBus) {
this.halfFlowBus = halfFlowBus;
}
public boolean isBridge() {
return bridge;
}
public void setBridge(boolean bridge) {
this.bridge = bridge;
}
@Override
public String toString() {
return "HalfFlow{" +
"id=" + id +
", halfFlowNumber='" + halfFlowNumber + '\'' +
", name='" + name + '\'' +
", way=" + way +
", externalDocLink='" + externalDocLink + '\'' +
", mode=" + mode +
", internalReferent='" + internalReferent + '\'' +
", backupReferent='" + backupReferent + '\'' +
", format=" + format +
", connector=" + connector +
", confidentiality=" + confidentiality +
", integrity=" + integrity+
", halfFlowAvailability=" + halfFlowAvailability +
", halfFlowApplication=" + halfFlowApplication +
", halfFlowBus=" + halfFlowBus +
", serviceHalfFlow=" + serviceHalfFlow +
(exchange != null ? ", exchange=" + exchange.getName() : "exchange=null" )+
", bridge=" + bridge +
'}';
}
}
这是我的控制器签名：
@RequestMapping(method = RequestMethod.POST)
public ResponseEntity<HalfFlow> save(@RequestBody HalfFlow halfflow){...}
我想知道什么可以引发这个错误，这看起来有点随意......
答案 0 :(得分：12)
正如Alex所说，为了防止无限递归，你添加了这个注释
@JsonIgnoreProperties(value = {"exchange"})
@OneToMany(mappedBy = "exchange")
private List<HalfFlow> halfFlows;
所以我实际上通过在注释中添加以下内容来解决这个问题
@JsonIgnoreProperties(value = {"exchange"}, allowSetters = true)
@OneToMany(mappedBy = "exchange")
private List<HalfFlow> halfFlows;
答案 1 :(得分：3)
我认为只有在首次序列化Exchange实体时才会出现此问题。也许杰克逊保存了一份＆＃34;副本＆＃34;每个对象的属性？
为防止无限循环，您添加了此注释：
@JsonIgnoreProperties(value = {"exchange"})
@OneToMany(mappedBy = "exchange")
private List<HalfFlow> halfFlows;
所以，我的猜测是杰克逊＆＃34;黑名单＆＃34; Halfflow bean的财产交换。
解决方法：对控制器上的每个实体使用ObjectMapper：
ObjectMapper mapper = new ObjectMapper();
@RequestMapping(method = RequestMethod.POST)
public ResponseEntity<HalfFlow> save(@RequestBody String json) throws JsonParseException, JsonMappingException, IOException {
HalfFlow node = mapper.readValue(json, HalfFlow.class);
HalfFlow halfflow = mapper.convertValue(node, HalfFlow.class);