英文:
SpringBoot:How can I bind two JSON pojo into two seperate objects using Wrapper Class and save them to my DB?
问题
I have used Wrapper Class to keep both the Objects in JSON but when I am trying to fetch it using @RequestBody in my Controller I am getting a NullPointerException. I think the code structure will make more sense in understanding.
Model - SupMain.java
public class SupMain {
private Supplier supplier;
private Supplier_Part supplierPart;
public SupMain(Supplier supplier, Supplier_Part supplierPart) {
this.supplier = supplier;
this.supplierPart = supplierPart;
}
public Supplier getSupplier() {
return supplier;
}
public Supplier_Part getSupplierPart() {
return supplierPart;
}
}
Supplier.java
@Entity
@Table
public class Supplier {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long sup_Id;
private String sup_name;
private String sup_mailId;
private int sup_phoneNo;
private String sup_location;
private String sup_feedback;
public Supplier_Part getSupplier_part() {
return supplier_part;
}
public void setSupplier_part(Supplier_Part supplier_part) {
this.supplier_part = supplier_part;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "part_Id",nullable=false,unique=true)
private Supplier_Part supplier_part;
public Supplier() { }
public Supplier(Long sup_Id, String sup_name, String sup_mailId, int sup_phoneNo, String sup_location, String sup_feedback) {
this.sup_Id = sup_Id;
this.sup_name = sup_name;
this.sup_mailId = sup_mailId;
this.sup_phoneNo = sup_phoneNo;
this.sup_location = sup_location;
this.sup_feedback = sup_feedback;
}
// Rest of the methods...
}
Similarly, I have another Supplier_Part entity also.
SupplierController.java
@Controller
public class SuppliersController {
@Autowired
SupplierService supplierService;
@Autowired
Supplier_PartRepoistory supplier_partRepoistory;
@Autowired
SupplierRepository supplierRepository;
@RequestMapping("/suppliers/{id}")
public List<Supplier> getAllSuppliers(@Param("id") Long id){
return supplierService.getSupliersByPart(id);
}
@RequestMapping("/addSuppliers", method = RequestMethod.POST)
public Supplier addSupplier(@RequestBody SupMain supMain){
Supplier supplier = supMain.getSupplier();
System.out.println(supplier);
Supplier_Part supplierPart = supMain.getSupplierPart();
List<Supplier> list = new ArrayList<>();
list.add(supplier);
supplierPart.setSupplierList(list);
supplier.setSupplier_part(supplierPart);
supplierRepository.save(supplier);
supplier_partRepoistory.save(supplierPart);
return supplier;
}
}
This is how my JSON data looks like:
{
"Supplier": {
"sup_Id": 1,
"sup_name": "Arpita",
"sup_mailId": "arpitamitra",
"sup_phoneNo": "98856565",
"sup_location": "bakers street",
"sup_feedback": "Best"
},
"Supplier_Part": {
"part_Id": 1,
"part_name": "Monitor",
"part_desc": "xyzzz",
"part_quantity": 20,
"part_timePeriod": 5
}
}
Getting a 500 internal server error with the following stack trace:
java.lang.NullPointerException: null
at com.cognizant.Suppliers.Controller.SuppliersController.addSupplier(SuppliersController.java:46) ~[classes/:na]
// Rest of the stack trace...
Thanks a Ton in advance!
英文:
I have used Wrapper Class to keep both the Objects in JSON but when I am trying to fetch it using @RequestBody in my Controller I am getting a NullPointerException. I think the code structure will make more sense in understanding.
Model - SupMain.java
private Supplier supplier;
private Supplier_Part supplierPart;
public SupMain(Supplier supplier, Supplier_Part supplierPart) {
this.supplier = supplier;
this.supplierPart = supplierPart;
}
public Supplier getSupplier() {
return supplier;
}
public Supplier_Part getSupplierPart() {
return supplierPart;
}
}
Supplier.java
@Table
public class Supplier {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long sup_Id;
private String sup_name;
private String sup_mailId;
private int sup_phoneNo;
private String sup_location;
private String sup_feedback;
public Supplier_Part getSupplier_part() {
return supplier_part;
}
public void setSupplier_part(Supplier_Part supplier_part) {
this.supplier_part = supplier_part;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "part_Id",nullable=false,unique=true)
private Supplier_Part supplier_part;
public Supplier() { }
public Supplier(Long sup_Id, String sup_name, String sup_mailId, int sup_phoneNo, String sup_location, String sup_feedback) {
this.sup_Id = sup_Id;
this.sup_name = sup_name;
this.sup_mailId = sup_mailId;
this.sup_phoneNo = sup_phoneNo;
this.sup_location = sup_location;
this.sup_feedback = sup_feedback;
}
public Long getSup_Id() {
return sup_Id;
}
public void setSup_Id(Long sup_Id) {
this.sup_Id = sup_Id;
}
public String getSup_name() {
return sup_name;
}
public void setSup_name(String sup_name) {
this.sup_name = sup_name;
}
public String getSup_mailId() {
return sup_mailId;
}
public void setSup_mailId(String sup_mailId) {
this.sup_mailId = sup_mailId;
}
public int getSup_phoneNo() {
return sup_phoneNo;
}
public void setSup_phoneNo(int sup_phoneNo) {
this.sup_phoneNo = sup_phoneNo;
}
public String getSup_location() {
return sup_location;
}
public void setSup_location(String sup_location) {
this.sup_location = sup_location;
}
public String getSup_feedback() {
return sup_feedback;
}
public void setSup_feedback(String sup_feedback) {
this.sup_feedback = sup_feedback;
}
@Override
public String toString() {
return "Supplier{" +
"sup_Id=" + sup_Id +
", sup_name='" + sup_name + '\'' +
", sup_mailId='" + sup_mailId + '\'' +
", sup_phoneNo=" + sup_phoneNo +
", sup_location='" + sup_location + '\'' +
", sup_feedback='" + sup_feedback + '\'' +
'}';
}
}
Similarly I have another Supplier_Part entity also.
I have two repositories that are extending CRUD and a Controller where I am trying to keep a rest end point of POST where I want to take two objects from JSON and store them to my DB.
SupplierController.java
@Controller
public class SuppliersController {
@Autowired
SupplierService supplierService;
@Autowired
Supplier_PartRepoistory supplier_partRepoistory;
@Autowired
SupplierRepository supplierRepository;
@RequestMapping("/suppliers/{id}")
public List<Supplier> getAllSuppliers(@Param("id") Long id){
return supplierService.getSupliersByPart(id);
}
@RequestMapping("/addSuppliers",method = RequestMethod.POST)
public Supplier addSupplier(@RequestBody SupMain supMain){
Supplier supplier=supMain.getSupplier();
System.out.println(supplier);
Supplier_Part supplierPart=supMain.getSupplierPart();
List<Supplier> list=new ArrayList<>();
list.add(supplier);
supplierPart.setSupplierList(list);
supplier.setSupplier_part(supplierPart);
supplierRepository.save(supplier);
supplier_partRepoistory.save(supplierPart);
return supplier;
}
}
This is how my JSON data looks like
{
"Supplier":{
"sup_Id":1,
"sup_name":"Arpita",
"sup_mailId":"arpitamitra",
"sup_phoneNo":"98856565",
"sup_location":"bakers street",
"sup_feedback":"Best"
},
"Supplier_Part":{
"part_Id":1,
"part_name":"Monitor",
"part_desc":"xyzzz",
"part_quantity":20,
"part_timePeriod":5
}
}
Getting a 500 internal server error with
java.lang.NullPointerException: null
at com.cognizant.Suppliers.Controller.SuppliersController.addSupplier(SuppliersController.java:46) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Thanks a Ton in advance !
答案1
得分: 0
"Supplier" 和 "Supplier_Part" 是输入的键，它们不允许数据绑定到您的 SupMain 类属性 "supplier" 和 "supplier_part"。它们应该与类属性的大小写相同。重命名它们并尝试，我相信它应该能工作。
英文:
It's the keys "Supplier" and "Supplier_Part" of the input which is not letting the data gets bound to your SupMain class property "supplier" and supplier_part".
It should be of the same case as the class property.
Rename it and try, I believe it should work.
答案2
得分: 0
{
"supplier": {
"sup_Id": 1,
"sup_name": "Arpita",
"sup_mailId": "arpitamitra",
"sup_phoneNo": "98856565",
"sup_location": "bakers street",
"sup_feedback": "Best"
},
"supplierPart": {
"part_Id": 1,
"part_name": "Monitor",
"part_desc": "xyzzz",
"part_quantity": 20,
"part_timePeriod": 5
}
}
instead of Supplier and Supplier_Part!
SupMain class has two private variables name supplier and supplierPart
Thanks!
英文:
The JSON data needs to be updated !
{
"supplier":{
"sup_Id":1,
"sup_name":"Arpita",
"sup_mailId":"arpitamitra",
"sup_phoneNo":"98856565",
"sup_location":"bakers street",
"sup_feedback":"Best"
},
"supplierPart":{
"part_Id":1,
"part_name":"Monitor",
"part_desc":"xyzzz",
"part_quantity":20,
"part_timePeriod":5
}
}
instead of Supplier and Supplier_Part !
SupMain class has two private variables name supplier and supplierPart
Thanks !
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