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Maven Spring MVC JPAとPostgresを使用してWebアプリケーションを作成しようとしています。しかし、私はまだデータベースにオブジェクトを保持することができません。トランザクションを開始しながら、私はエラーを持っている：接続が開けませんでした。このResultSetが閉じています
org.hibernate.exception.GenericJDBCException: Could not open connection
caused by org.postgresql.util.PSQLException: This ResultSet is closed.
ここでコード
@Controller
public class ExamController {
@GetMapping("/hello")
public String hello(Model model) {
// EntityManager entityManager =
EntityManagerUtil.getEntityManager();
try {
EntityManager entityManager =
Persistence.createEntityManagerFactory("examinatorpu").createEntityManager();
entityManager.getTransaction().begin();
entityManager.persist(new Exam());
entityManager.getTransaction().commit();
entityManager.close();
System.out.println("_exam_ok_");
} catch (Exception e) {
// entityManager.getTransaction().rollback();
e.printStackTrace();
System.out.println("_exam_ko_");
}
model.addAttribute("examId", "1");
return "welcome";
}
}
は、ここに私のエンティティ
@Entity
@Table(name = "EXAM")
public class Exam {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "EXAM_ID")
private long id;
@Column(name = "TITLE")
private String title;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
、ここでは私のpersistence.xmlは
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="examinatorpu"
transaction-type="RESOURCE_LOCAL">
<class>examinator.entity.Exam</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" /> <!-- DB Driver -->
<property name="javax.persistence.jdbc.url"
value="jdbc:postgresql://localhost:5432/examinatordb" />
<property name="javax.persistence.jdbc.user" value="postgres" /> <!-- DB User -->
<property name="javax.persistence.jdbc.password" value="admin" /> <!-- DB Password -->
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" /> <!-- DB Dialect -->
<property name="hibernate.hbm2ddl.auto" value="update" /> <!-- create/create-drop/update -->
<property name="hibernate.show_sql" value="true" /> <!-- Show SQL in console -->
<property name="hibernate.format_sql" value="true" /> <!-- Show SQL formatted -->
<!-- <property name="hibernate.temp.use_jdbc_metadata_defaults" value="false"
/> -->
</properties>
</persistence-unit>
、ここでは、私はちょうど最新のものにJDBCのバージョンを変更し、エラー
javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1361)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1289)
at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1371)
at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:60)
at examinator.controller.ExamController.hello(ExamController.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:220)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:52)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:304)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:169)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160)
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1263)
at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:57)
... 40 more
Caused by: org.postgresql.util.PSQLException: This ResultSet is closed.
at org.postgresql.jdbc2.AbstractJdbc2ResultSet.checkClosed(AbstractJdbc2ResultSet.java:2674)
at org.postgresql.jdbc2.AbstractJdbc2ResultSet.setFetchSize(AbstractJdbc2ResultSet.java:1791)
at org.postgresql.jdbc4.Jdbc4Statement.createResultSet(Jdbc4Statement.java:39)
at org.postgresql.jdbc2.AbstractJdbc2Statement$StatementResultHandler.handleResultRows(AbstractJdbc2Statement.java:211)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1772)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:374)
at org.postgresql.jdbc2.AbstractJdbc2Connection.execSQLUpdate(AbstractJdbc2Connection.java:263)
at org.postgresql.jdbc2.AbstractJdbc2Connection.getTransactionIsolation(AbstractJdbc2Connection.java:775)
at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:182)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:276)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:297)
... 45 more
PostgreSQLのどのバージョンのPostgreSQL JDBCドライバとどのバージョンのPostgreSQL JDBCドライバを使用していますか？ –
これはselect version（）を実行したときの結果です。 pgadmin：i686-apple-darwin11-llvm-gcc-4.2（GCC）4.2.1（Apple Inc.ビルド5658ベース）（LLVMビルド2336.11.00）、64-ビット との達人： \t \t \t のpostgresql \t \t \t PostgreSQLは \t \t \t 9.0-801.jdbc4 \t \t –
Judy1989