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私はspring mvcでいくつかのAPIを実行しようとしています。私がclearKoszykメソッドを実行すると：Spring Hibernate：TypedQuery NullPointerException
私は応答ステータス500エラーになるので、内部サーバーエラーです。だから私はこのNPEがここにあると思い
SEVERE: Servlet.service() for servlet [DispatcherServlet] in context with
path [/kino] threw exception [Request processing failed; nested exception
is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at org.hibernate.internal.SessionFactoryImpl.getReturnTypes(SessionFactoryImpl.java:1112)
at org.hibernate.internal.AbstractQueryImpl.getReturnTypes(AbstractQueryImpl.java:192)
at org.hibernate.ejb.AbstractEntityManagerImpl.createNamedQuery(AbstractEntityManagerImpl.java:690)
at sun.reflect.GeneratedMethodAccessor69.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:298)
at com.sun.proxy.$Proxy43.createNamedQuery(Unknown Source)
at kino.repositoryImpl.KoszykRepositoryImpl.deleteKoszyk(KoszykRepositoryImpl.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy50.deleteKoszyk(Unknown Source)
at kino.serviceImpl.KoszykServiceImpl.deleteKoszyk(KoszykServiceImpl.java:50)
at kino.controllers.KoszykController.DeleteKoszyk(KoszykController.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
：
at kino.repositoryImpl.KoszykRepositoryImpl.deleteKoszyk(KoszykRepositoryImpl.java:60)
しかし、私は本当にこの例外が発生かわからないによって引き起こされます。 EntityManagerまたはUserがnullかどうかを確認しています。
56 public void deleteKoszyk(User user) throws NullPointerException{
57
58 if(user != null){
59 if(emManager != null){
60 TypedQuery<Koszyk> query = emManager.createNamedQuery("Koszyk.deleteKoszyk", Koszyk.class);
query.setParameter("id", user.getId());
query.executeUpdate();
}else{
throw new NullPointerException("emManager = null");
}
}else{
throw new NullPointerException("Podany użytkownik nie istnieje");
}
}
これは私のkoszykクラスです。
@Entity
@NamedQuery(name = "Koszyk.deleteKoszyk", query = "DELETE FROM Koszyk k WHERE k.user.id = :id")
@Table(name="Koszyk")
public class Koszyk implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
@Column(name="Koszyk_id")
private Long id;
@OneToOne
private User user;
@Column(name="Cena")
private int cena;
@Column(name="KoszykItems")
@OneToMany(mappedBy="koszyk", fetch = FetchType.EAGER)
private List<KoszykItem> koszykItems;
この問題は、idでkoszykを削除または検索しようとすると表示されます。私はこの実体から読むことができ、私はそれを通常の方法で示すことができます。それは私のKoszykRepositoryクラスです：
@Repository
@Transactional
public class KoszykRepositoryImpl implements KoszykRepository {
@PersistenceContext
private EntityManager emManager;
public KoszykRepositoryImpl(){
}
@Override
public void update(Koszyk koszyk) {
emManager.merge(koszyk);
}
@Override
public Koszyk deleteKoszykItem(KoszykItem koszykItem, User user) {
Koszyk koszyk = read(user);
List<KoszykItem> listaItemow = koszyk.getKoszykItems();
listaItemow.remove(koszykItem);
koszyk.setKoszykItems(listaItemow);
update(koszyk);
return koszyk;
}
@Override
public void deleteKoszyk(User user) throws NullPointerException{
if(user != null){
if(emManager != null){
TypedQuery<Koszyk> query = emManager.createNamedQuery("Koszyk.deleteKoszyk", Koszyk.class);
query.setParameter("id", user.getId());
query.executeUpdate();
}else{
throw new NullPointerException("emManager = null");
}
}else{
throw new NullPointerException("Podany użytkownik nie istnieje");
}
}
@Override
public void create(User user, Koszyk koszykDoZapisu) {
List<Koszyk> ListaKoszykow = read();
boolean zapisz = true;
if(user == null){
throw new NullPointerException("Zaloguj się!");
}else if(!ListaKoszykow.isEmpty() && ListaKoszykow != null){
for(Koszyk koszyk: ListaKoszykow){
if(koszyk.getUser().getId() == user.getId()){
zapisz = false;
break;
}
}
}
if(zapisz){
koszykDoZapisu.setUser(user);
emManager.persist(koszykDoZapisu);
}
}
@Override
public List<Koszyk> read() {
return emManager.createQuery("SELECT k FROM Koszyk k", Koszyk.class).getResultList();
}
@Override
public Koszyk read(User user) {
List<Koszyk> ListaKoszykow = read();
Koszyk zwracany = new Koszyk();
if(user == null){
throw new NullPointerException("Zaloguj się!");
}
if(ListaKoszykow.isEmpty() || ListaKoszykow == null){
throw new NullPointerException("Dany użytkownik nie ma jeszcze przypisanego koszyka");
}else{
for(Koszyk koszyk: ListaKoszykow){
if(koszyk.getUser().equals(user)){
zwracany = koszyk;
//Hibernate.initialize(zwracany.getKoszykItems());
}
}
}
return zwracany;
}
}
[EDIT]
私はこれに機能を削除変更しました：
public void deleteKoszyk(User user) throws NullPointerException{
if(user != null){
if(emManager != null){
final Query query = emManager.createNamedQuery("Koszyk.deleteKoszyk");
query.setParameter("id", user.getId());
63 final int executeUpdate = query.executeUpdate();
}else{
throw new NullPointerException("emManager = null");
}
}else{
throw new NullPointerException("Podany użytkownik nie istnieje");
}
}
とstacktreeがcompletly異なります
SEVERE: Servlet.service() for servlet [DispatcherServlet] in context with
path [/kino] threw exception [Request processing failed; nested exception is
javax.persistence.PersistenceException:
org.hibernate.exception.ConstraintViolationException: Cannot delete or
update a parent row: a foreign key constraint fails (`marcin`.`koszykitem`,
CONSTRAINT `FK8F90CFF02AE8E273` FOREIGN KEY (`koszyk_Koszyk_id`) REFERENCES
`koszyk` (`Koszyk_id`))] with root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:
Cannot delete or update a parent row: a foreign key constraint fails
(`marcin`.`koszykitem`, CONSTRAINT `FK8F90CFF02AE8E273` FOREIGN KEY
(`koszyk_Koszyk_id`) REFERENCES `koszyk` (`Koszyk_id`))
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.Util.getInstance(Util.java:387)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:932)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2073)
at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2009)
at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5094)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1994)
at sun.reflect.GeneratedMethodAccessor66.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
at com.sun.proxy.$Proxy51.executeUpdate(Unknown Source)
at org.hibernate.hql.internal.ast.exec.BasicExecutor.execute(BasicExecutor.java:95)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.executeUpdate(QueryTranslatorImpl.java:413)
at org.hibernate.engine.query.spi.HQLQueryPlan.performExecuteUpdate(HQLQueryPlan.java:283)
at org.hibernate.internal.SessionImpl.executeUpdate(SessionImpl.java:1135)
at org.hibernate.internal.QueryImpl.executeUpdate(QueryImpl.java:116)
at org.hibernate.ejb.QueryImpl.internalExecuteUpdate(QueryImpl.java:183)
at org.hibernate.ejb.AbstractQueryImpl.executeUpdate(AbstractQueryImpl.java:99)
at kino.repositoryImpl.KoszykRepositoryImpl.deleteKoszyk(KoszykRepositoryImpl.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy48.deleteKoszyk(Unknown Source)
at kino.serviceImpl.KoszykServiceImpl.deleteKoszyk(KoszykServiceImpl.java:50)
at kino.controllers.KoszykController.DeleteKoszyk(KoszykController.java:91)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
deleteKoszykメソッドでブレークポイントを設定して、何がnullであるかを確認することができますか？ – yogidilip
私はそれをしました。私はuser.koszykがnullであることに気付いた：http://imgur.com/a/Hyyiu。私はそれを修正しました：http://imgur.com/a/3EtBQ。しかし、私はまだ同じエラーが発生しており、何がnullになるのかを調べる方法はわかりません。同じ行のエラーはまったく同じです。 – Marcin46