我在Springboot中有一个RESTful Web服务，其端点定义为：
@RequestMapping(
value="/api/users",
method=RequestMethod.POST,
consumes=MediaType.APPLICATION_JSON_VALUE,
produces=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<User> createUser(
@Valid @RequestBody User user, BindingResult result) {
if (result.hasErrors()) {
return new ResponseEntity<User>(user, HttpStatus.BAD_REQUEST);
}
User savedUser = userService.create(user);
return new ResponseEntity<User>(savedUser, HttpStatus.CREATED);
}
，用户架构定义为：
CREATE TABLE User (
userId BIGINT GENERATED BY DEFAULT AS IDENTITY (START WITH 1, INCREMENT BY 1) NOT NULL,
username VARCHAR(100) NOT NULL UNIQUE,
password VARCHAR(100) NOT NULL,
email VARCHAR(100) NOT NULL UNIQUE,
mobile BIGINT NOT NULL UNIQUE,
PRIMARY KEY (userId)
);
我想确保使用相同用户名/电子邮件或手机的用户不会注册。在我的Postman客户端中，当我发出具有重复值的POST请求时，我收到500内部服务器错误，并且在我的服务器端出现以下错误字符串：
2015-08-11 18:27:10.454 WARN 4644 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.Sql
ExceptionHelper : SQL Error: -104, SQLState: 23505
2015-08-11 18:27:10.454 ERROR 4644 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.Sql
ExceptionHelper : integrity constraint violation: unique constraint or index v
iolation; SYS_CT_10094 table: USER
2015-08-11 18:27:10.494 ERROR 4644 --- [nio-8080-exec-3] o.a.c.c.C.[.[.[/].[disp
atcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context
with path [] threw exception [Request processing failed; nested exception is or
g.springframework.dao.DataIntegrityViolationException: could not execute stateme
nt; SQL [n/a]; constraint [SYS_CT_10094]; nested exception is org.hibernate.exce
ption.ConstraintViolationException: could not execute statement] with root cause
org.hsqldb.HsqlException: integrity constraint violation: unique constraint or i
ndex violation; SYS_CT_10094 table: USER
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.Constraint.getException(Unknown Source)
at org.hsqldb.index.IndexAVLMemory.insert(Unknown Source)
at org.hsqldb.persist.RowStoreAVL.indexRow(Unknown Source)
at org.hsqldb.TransactionManager2PL.addInsertAction(Unknown Source)
at org.hsqldb.Session.addInsertAction(Unknown Source)
at org.hsqldb.Table.insertSingleRow(Unknown Source)
at org.hsqldb.StatementDML.insertRowSet(Unknown Source)
at org.hsqldb.StatementInsert.getResult(Unknown Source)
at org.hsqldb.StatementDMQL.execute(Unknown Source)
at org.hsqldb.Session.executeCompiledStatement(Unknown Source)
at org.hsqldb.Session.execute(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.executeUpdate(Unknown Source)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(
ResultSetReturnImpl.java:208)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAn
dExtract(IdentityGenerator.java:96)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(Abstr
actReturningDelegate.java:58)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(Abstrac
tEntityPersister.java:3032)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(Abstrac
tEntityPersister.java:3558)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(Enti
tyIdentityInsertAction.java:98)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:492)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(Ac
tionQueue.java:197)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java
:181)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:216)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertActio
n(AbstractSaveEventListener.java:334)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrR
eplicate(AbstractSaveEventListener.java:289)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(Ab
stractSaveEventListener.java:195)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGenera
tedId(AbstractSaveEventListener.java:126)
at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWit
hGeneratedId(JpaPersistEventListener.java:84)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTran
sient(DefaultPersistEventListener.java:206)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(De
faultPersistEventListener.java:149)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(De
faultPersistEventListener.java:75)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntit
yManagerImpl.java:1181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEnti
tyManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:344)
at com.sun.proxy.$Proxy76.persist(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityMa
nagerInvocationHandler.invoke(SharedEntityManagerCreator.java:291)
at com.sun.proxy.$Proxy76.persist(Unknown Source)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.s
ave(SimpleJpaRepository.java:433)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.data.repository.core.support.RepositoryFactorySup
port$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.jav
a:436)
at org.springframework.data.repository.core.support.RepositoryFactorySup
port$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:421)
at org.springframework.data.repository.core.support.RepositoryFactorySup
port$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:393)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:179)
at org.springframework.data.repository.core.support.RepositoryFactorySup
port$DefaultMethodInvokingMethodInterceptor.invoke(RepositoryFactorySupport.java
:506)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.
proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.
invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.in
voke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterc
eptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPos
tProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetad
ataPostProcessor.java:122)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invok
e(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynami
cAopProxy.java:207)
at com.sun.proxy.$Proxy81.save(Unknown Source)
at favorite.ws.service.UserServiceBean.create(UserServiceBean.java:28)
at favorite.ws.web.api.UserController.createUser(UserController.java:73)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvok
e(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeF
orRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocabl
eHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingH
andlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingH
andlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapt
er.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(Dispatch
erServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(Dispatche
rServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(Frame
workServlet.java:967)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServ
let.java:869)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkSer
vlet.java:843)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52
)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at favorite.ws.filters.SimpleCORSFilter.doFilter(SimpleCORSFilter.java:2
2)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInterna
l(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerR
equestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterIntern
al(CharacterEncodingFilter.java:85)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerR
equestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:79)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp
11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(
AbstractProtocol.java:668)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpo
int.java:1521)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoin
t.java:1478)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskTh
read.java:61)
at java.lang.Thread.run(Thread.java:745)
有人可以告诉我出了什么问题吗？为什么我收到500内部服务器错误而不是400错误请求错误？我该如何解决这个问题？
如果用户选择已经使用的用户名（例如），我希望服务器发送一个回复告诉他。我该如何实现这一目标？告诉他用户名不是唯一的或电子邮件已经注册（即用户名/电子邮件/移动设备的错误消息不同）？
谢谢！
答案 0 :(得分：0)
在数据库方面，您需要为UNIQUE约束指定名称，以便稍后可以使用它们来判断数据库中已有哪个字段。
CREATE TABLE User (
userId BIGINT GENERATED BY DEFAULT AS IDENTITY (START WITH 1, INCREMENT BY 1) NOT NULL,
username VARCHAR(100) NOT NULL,
password VARCHAR(100) NOT NULL,
email VARCHAR(100) NOT NULL,
mobile BIGINT NOT NULL,
CONSTRAINT PK PRIMARY KEY (userId),
CONSTRAINT USERKEY UNIQUE(USERNAME),
CONSTRAINT EMAILKEY UNIQUE(EMAIL),
CONSTRAINT MOBILEKEY UNIQUE(MOBILE)
);
我不知道servlet返回代码的答案。