SpringBoot:How can I bind two JSON pojo into two seperate objects using Wrapper Class and save them to my DB?

huangapple
go评论162阅读模式
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

  1. public class SupMain {
  3.     private Supplier supplier;
  4.     private Supplier_Part supplierPart;
  6.     public SupMain(Supplier supplier, Supplier_Part supplierPart) {
  7.         this.supplier = supplier;
  8.         this.supplierPart = supplierPart;
  9.     }
  11.     public Supplier getSupplier() {
  12.         return supplier;
  13.     }
  15.     public Supplier_Part getSupplierPart() {
  16.         return supplierPart;
  17.     }
  18. }

Supplier.java

  1. @Entity
  2. @Table
  3. public class Supplier {
  5.     @Id
  6.     @GeneratedValue(strategy = GenerationType.AUTO)
  7.     private Long sup_Id;
  8.     private String sup_name;
  9.     private String sup_mailId;
  10.     private int sup_phoneNo;
  11.     private String sup_location;
  12.     private String sup_feedback;
  14.     public Supplier_Part getSupplier_part() {
  15.         return supplier_part;
  16.     }
  18.     public void setSupplier_part(Supplier_Part supplier_part) {
  19.         this.supplier_part = supplier_part;
  20.     }
  22.     @ManyToOne(fetch = FetchType.LAZY)
  23.     @JoinColumn(name = "part_Id",nullable=false,unique=true)
  24.     private Supplier_Part supplier_part;
  26.     public Supplier() { }
  28.     public Supplier(Long sup_Id, String sup_name, String sup_mailId, int sup_phoneNo, String sup_location, String sup_feedback) {
  29.         this.sup_Id = sup_Id;
  30.         this.sup_name = sup_name;
  31.         this.sup_mailId = sup_mailId;
  32.         this.sup_phoneNo = sup_phoneNo;
  33.         this.sup_location = sup_location;
  34.         this.sup_feedback = sup_feedback;
  35.     }
  37.     // Rest of the methods...
  38. }

Similarly, I have another Supplier_Part entity also.

SupplierController.java

  1. @Controller
  2. public class SuppliersController {
  4.     @Autowired
  5.     SupplierService supplierService;
  7.     @Autowired
  8.     Supplier_PartRepoistory supplier_partRepoistory;
  10.     @Autowired
  11.     SupplierRepository supplierRepository;
  13.     @RequestMapping("/suppliers/{id}")
  14.     public List<Supplier> getAllSuppliers(@Param("id") Long id){
  15.        return supplierService.getSupliersByPart(id);
  16.     }
  18.     @RequestMapping("/addSuppliers", method = RequestMethod.POST)
  19.     public Supplier addSupplier(@RequestBody SupMain supMain){
  21.         Supplier supplier = supMain.getSupplier();
  22.         System.out.println(supplier);
  23.         Supplier_Part supplierPart = supMain.getSupplierPart();
  25.         List<Supplier> list = new ArrayList<>();
  26.         list.add(supplier);
  28.         supplierPart.setSupplierList(list);
  29.         supplier.setSupplier_part(supplierPart);
  31.         supplierRepository.save(supplier);
  32.         supplier_partRepoistory.save(supplierPart);
  34.         return supplier;
  35.     }
  36. }

This is how my JSON data looks like:

  1. {
  2.     "Supplier": {
  3.         "sup_Id": 1,
  4.         "sup_name": "Arpita",
  5.         "sup_mailId": "arpitamitra",
  6.         "sup_phoneNo": "98856565",
  7.         "sup_location": "bakers street",
  8.         "sup_feedback": "Best"
  9.     },
  10.     "Supplier_Part": {
  11.         "part_Id": 1,
  12.         "part_name": "Monitor",
  13.         "part_desc": "xyzzz",
  14.         "part_quantity": 20,
  15.         "part_timePeriod": 5
  16.     }
  17. }

Getting a 500 internal server error with the following stack trace:

  1. java.lang.NullPointerException: null
  2.     at com.cognizant.Suppliers.Controller.SuppliersController.addSupplier(SuppliersController.java:46) ~[classes/:na]
  3.     // 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

  2.     private Supplier supplier;
  3.     private Supplier_Part supplierPart;
  5.     public SupMain(Supplier supplier, Supplier_Part supplierPart) {
  6.         this.supplier = supplier;
  7.         this.supplierPart = supplierPart;
  8.     }
  10.     public Supplier getSupplier() {
  11.         return supplier;
  12.     }
  14.     public Supplier_Part getSupplierPart() {
  15.         return supplierPart;
  16.     }
  19. }

Supplier.java

  1. @Table
  2. public class Supplier {
  4.     @Id
  5.     @GeneratedValue(strategy = GenerationType.AUTO)
  6.     private Long sup_Id;
  7.     private String sup_name;
  8.     private String sup_mailId;
  9.     private int sup_phoneNo;
  10.     private String sup_location;
  11.     private String sup_feedback;
  13.     public Supplier_Part getSupplier_part() {
  14.         return supplier_part;
  15.     }
  17.     public void setSupplier_part(Supplier_Part supplier_part) {
  18.         this.supplier_part = supplier_part;
  19.     }
  21.     @ManyToOne(fetch = FetchType.LAZY)
  22.     @JoinColumn(name = &quot;part_Id&quot;,nullable=false,unique=true)
  23.      private Supplier_Part supplier_part;
  26.     public Supplier() { }
  28.     public Supplier(Long sup_Id, String sup_name, String sup_mailId, int sup_phoneNo, String sup_location, String sup_feedback) {
  29.         this.sup_Id = sup_Id;
  30.         this.sup_name = sup_name;
  31.         this.sup_mailId = sup_mailId;
  32.         this.sup_phoneNo = sup_phoneNo;
  33.         this.sup_location = sup_location;
  34.         this.sup_feedback = sup_feedback;
  36.     }
  39.     public Long getSup_Id() {
  40.         return sup_Id;
  41.     }
  43.     public void setSup_Id(Long sup_Id) {
  44.         this.sup_Id = sup_Id;
  45.     }
  47.     public String getSup_name() {
  48.         return sup_name;
  49.     }
  51.     public void setSup_name(String sup_name) {
  52.         this.sup_name = sup_name;
  53.     }
  55.     public String getSup_mailId() {
  56.         return sup_mailId;
  57.     }
  59.     public void setSup_mailId(String sup_mailId) {
  60.         this.sup_mailId = sup_mailId;
  61.     }
  63.     public int getSup_phoneNo() {
  64.         return sup_phoneNo;
  65.     }
  67.     public void setSup_phoneNo(int sup_phoneNo) {
  68.         this.sup_phoneNo = sup_phoneNo;
  69.     }
  71.     public String getSup_location() {
  72.         return sup_location;
  73.     }
  75.     public void setSup_location(String sup_location) {
  76.         this.sup_location = sup_location;
  77.     }
  79.     public String getSup_feedback() {
  80.         return sup_feedback;
  81.     }
  83.     public void setSup_feedback(String sup_feedback) {
  84.         this.sup_feedback = sup_feedback;
  85.     }
  91.     @Override
  92.     public String toString() {
  93.         return &quot;Supplier{&quot; +
  94.                 &quot;sup_Id=&quot; + sup_Id +
  95.                 &quot;, sup_name=&#39;&quot; + sup_name + &#39;\&#39;&#39; +
  96.                 &quot;, sup_mailId=&#39;&quot; + sup_mailId + &#39;\&#39;&#39; +
  97.                 &quot;, sup_phoneNo=&quot; + sup_phoneNo +
  98.                 &quot;, sup_location=&#39;&quot; + sup_location + &#39;\&#39;&#39; +
  99.                 &quot;, sup_feedback=&#39;&quot; + sup_feedback + &#39;\&#39;&#39; +
  101.                 &#39;}&#39;;
  102.     }
  103. }

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

  2. @Controller
  3. public class SuppliersController {
  5.     @Autowired
  6.     SupplierService supplierService;
  8.     @Autowired
  9.     Supplier_PartRepoistory supplier_partRepoistory;
  11.     @Autowired
  12.     SupplierRepository supplierRepository;
  14.     @RequestMapping(&quot;/suppliers/{id}&quot;)
  15.     public List&lt;Supplier&gt; getAllSuppliers(@Param(&quot;id&quot;) Long id){
  16.        return supplierService.getSupliersByPart(id);
  17.     }
  19.     @RequestMapping(&quot;/addSuppliers&quot;,method = RequestMethod.POST)
  20.     public Supplier addSupplier(@RequestBody SupMain supMain){
  22.         Supplier supplier=supMain.getSupplier();
  23.         System.out.println(supplier);
  24.         Supplier_Part supplierPart=supMain.getSupplierPart();
  26.         List&lt;Supplier&gt; list=new ArrayList&lt;&gt;();
  27.         list.add(supplier);
  30.         supplierPart.setSupplierList(list);
  31.         supplier.setSupplier_part(supplierPart);
  33.         supplierRepository.save(supplier);
  34.         supplier_partRepoistory.save(supplierPart);
  36.         return supplier;
  40.     }
  42. }

This is how my JSON data looks like

  1. {
  2. 	&quot;Supplier&quot;:{
  3. 		&quot;sup_Id&quot;:1,
  4. 		&quot;sup_name&quot;:&quot;Arpita&quot;,
  5. 		&quot;sup_mailId&quot;:&quot;arpitamitra&quot;,
  6. 		&quot;sup_phoneNo&quot;:&quot;98856565&quot;,
  7. 		&quot;sup_location&quot;:&quot;bakers street&quot;,
  8. 		&quot;sup_feedback&quot;:&quot;Best&quot;
  9. 	},
  10. 	
  11. 	&quot;Supplier_Part&quot;:{
  12. 		&quot;part_Id&quot;:1,
  13. 		&quot;part_name&quot;:&quot;Monitor&quot;,
  14. 		&quot;part_desc&quot;:&quot;xyzzz&quot;,
  15. 		&quot;part_quantity&quot;:20,
  16. 		&quot;part_timePeriod&quot;:5
  17. 	}
  18. }

Getting a 500 internal server error with

  1. java.lang.NullPointerException: null
  2. 	at com.cognizant.Suppliers.Controller.SuppliersController.addSupplier(SuppliersController.java:46) ~[classes/:na]
  3. 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
  4. 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
  5. 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
  6. 	at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
  7. 	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  8. 	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  9. 	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  10. 	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  11. 	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  12. 	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  13. 	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  14. 	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  15. 	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  16. 	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  17. 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
  18. 	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  19. 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
  20. 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  21. 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  22. 	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.37.jar:9.0.37]
  23. 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  24. 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  25. 	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  26. 	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  27. 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  28. 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  29. 	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  30. 	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  31. 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  32. 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  33. 	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  34. 	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
  35. 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  36. 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  37. 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  38. 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  39. 	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  40. 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  41. 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  42. 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  43. 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  44. 	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  45. 	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  46. 	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  47. 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  48. 	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  49. 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
  50. 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
  51. 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
  52. 	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"
},

  1. "supplierPart": {
  2. 	"part_Id": 1,
  3. 	"part_name": "Monitor",
  4. 	"part_desc": "xyzzz",
  5. 	"part_quantity": 20,
  6. 	"part_timePeriod": 5
  7. }

}
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 !

  1. {
  2. 	&quot;supplier&quot;:{
  3. 		&quot;sup_Id&quot;:1,
  4. 		&quot;sup_name&quot;:&quot;Arpita&quot;,
  5. 		&quot;sup_mailId&quot;:&quot;arpitamitra&quot;,
  6. 		&quot;sup_phoneNo&quot;:&quot;98856565&quot;,
  7. 		&quot;sup_location&quot;:&quot;bakers street&quot;,
  8. 		&quot;sup_feedback&quot;:&quot;Best&quot;
  9. 	},
  10. 	
  11. 	&quot;supplierPart&quot;:{
  12. 		&quot;part_Id&quot;:1,
  13. 		&quot;part_name&quot;:&quot;Monitor&quot;,
  14. 		&quot;part_desc&quot;:&quot;xyzzz&quot;,
  15. 		&quot;part_quantity&quot;:20,
  16. 		&quot;part_timePeriod&quot;:5
  17. 	}
  18. }

instead of Supplier and Supplier_Part !
SupMain class has two private variables name supplier and supplierPart

Thanks !

huangapple
  • 本文由 发表于 2020年8月3日 12:29:33
  • 转载请务必保留本文链接：https://go.coder-hub.com/63223762.html
  • java
  • json
  • objectmapper
  • one-to-many
  • spring-boot
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定