I create a UserWork Entity class it contain 5 elements, out of five 2 elements are enum type. but when I try to access that entity class at the time of insert it throw me a null pointer exception on my enum data. Get Below type of error
java.lang.NullPointerException: Parameter specified as non-null is null: method com.nilmani.workmanagement.model.request.ReqWork.<init>, parameter fIxWork
at com.nilmani.workmanagement.model.request.ReqWork.<init>(ReqWork.kt) ~[main/:na]
at com.nilmani.workmanagement.model.request.ReqWork.<init>(ReqWork.kt:10) ~[main/:na]
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na]
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na]
at kotlin.reflect.jvm.internal.calls.CallerImpl$Constructor.call(CallerImpl.kt:41) ~[kotlin-reflect-1.5.31.jar:1.5.31-release-548(1.5.31)]
at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod$kotlin_reflection(KCallableImpl.kt:173) ~[kotlin-reflect-1.5.31.jar:1.5.31-release-548(1.5.31)]
at kotlin.reflect.jvm.internal.KCallableImpl.callBy(KCallableImpl.kt:112) ~[kotlin-reflect-1.5.31.jar:1.5.31-release-548(1.5.31)]
at org.springframework.beans.BeanUtils$KotlinDelegate.instantiateClass(BeanUtils.java:867) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:196) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.constructAttribute(ModelAttributeMethodProcessor.java:332) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:220) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:85) ~[spring-webmvc-5.3.12.jar:5.3.12]
at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:147) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:179) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:146) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.12.jar:5.3.12]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.12.jar:5.3.12]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:681) ~[tomcat-embed-core-9.0.54.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.12.jar:5.3.12]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.54.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.54.jar:9.0.54]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.12.jar:5.3.12]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.12.jar:5.3.12]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.12.jar:5.3.12]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1722) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.54.jar:9.0.54]
at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
Userwork.kt
package com.nilmani.workmanagement.entity
import com.nilmani.workmanagement.enum.FIxWork
import com.nilmani.workmanagement.enum.MaterialType
import java.time.LocalDate
import java.time.LocalDateTime
import javax.persistence.*
@Entity
data class UserWork(
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
val id:Long=-1,
// @OneToOne(mappedBy = "userWork")
// val user: User,
val userId:Long=-1,
@Enumerated(EnumType.STRING)
@Column(nullable = false)
val materialType: MaterialType,
@Enumerated(EnumType.STRING)
@Column(nullable = false)
val fIxWork: FIxWork,
val pieces:Int=0,
val workDate:LocalDateTime= LocalDateTime.now()
)
ReqWork.kt
package com.nilmani.workmanagement.model.request
import com.nilmani.workmanagement.enum.FIxWork
import com.nilmani.workmanagement.enum.MaterialType
import java.time.LocalDateTime
import javax.persistence.Column
import javax.persistence.EnumType
import javax.persistence.Enumerated
data class ReqWork (
val userId:Long=-1,
@Enumerated(EnumType.STRING)
@Column(nullable = false)
val materialType: MaterialType,
@Enumerated(EnumType.STRING)
@Column(nullable = false)
val fIxWork: FIxWork ,
val pieces:Int=0,
val workDate: LocalDateTime = LocalDateTime.now(),
)
UserWorkService.kt
package com.nilmani.workmanagement.service
import com.nilmani.workmanagement.entity.UserWork
import com.nilmani.workmanagement.model.request.ReqWork
import com.nilmani.workmanagement.repository.UserWorkRepository
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.stereotype.Service
import java.time.LocalDateTime
@Service
class UserWorkService {
@Autowired
private lateinit var userWorkRepository: UserWorkRepository
fun addWork(request:ReqWork):UserWork{
val newWork = UserWork(
userId = request.userId,
materialType = request.materialType,
fIxWork = request.fIxWork,
pieces = request.pieces,
workDate = LocalDateTime.now(),
)
return userWorkRepository.save(newWork)
}
}
AdminWorkController.kt
package com.nilmani.workmanagement.controller
import com.nilmani.workmanagement.entity.UserWork
import com.nilmani.workmanagement.model.request.ReqWork
import com.nilmani.workmanagement.model.response.RespWork
import com.nilmani.workmanagement.service.UserWorkService
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.http.HttpStatus
import org.springframework.http.ResponseEntity
import org.springframework.web.bind.annotation.ModelAttribute
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.RestController
@RestController
@RequestMapping("/work")
class AdminWorkController {
@Autowired
private lateinit var workService: UserWorkService
@PostMapping("/add")
fun addWork(@ModelAttribute request:ReqWork):ResponseEntity<*>{
val newWork = workService.addWork(request)
val respWork = RespWork(
newWork.userId,
newWork.materialType,
newWork.fIxWork,
)
return ResponseEntity(respWork,HttpStatus.OK)
}
}
I get the null pointer error in service class . What is the default value of enum type
CodePudding user response：
The stacktrace you provided shows that the exception actually doesn't occur in the service class, but in Spring's machinery when trying to call your controller.
AdminWorkController.addWork takes a request: ReqWork as input, so spring has to map the request data into a ReqWork instance, and that's what fails.
The failure means your request doesn't contain a value for fIxWork, so you should check the caller of /add endpoint. Most likely the form data doesn't contain a value for fIxWork.
CodePudding user response：
the crash is happening because val fIxWork is declared a non-null type FIxWork instead of null type FIxWork?
Please check why UserWorkService is returning null for fIxWork from method
fun addWork(request:ReqWork):UserWork
If it is normal to get null for fIxWork from above mentioned method, then please fix the declaration of the variable as
val fIxWork: FIxWork?