私はHibernate（学習しようとしている）とDerbyを使用しています。SquirrelとSQLスクリプトを使用してデータベースを作成および検査し、プログラムで3つのレコードをデータベースに書き込んでいます。
「トランザクションがまだアクティブな間は接続を閉じることができません」というメッセージが表示されます。hibernateの設定中に表示されるようですが、データベースに作成しているレコードはとにかくそこに書き込まれます。「40」以外のドライバーを試しました。休止状態の構成では、ユーザー名とパスワードを単独ではなくURLパラメーターとして入力しましたが、他にどのようなトランザクションが実行されているのかわかりません。ループ内のcreate（）の呼び出しにブレークポイントを設定しましたが、それがヒットするまでに、エラーはすでにコンソールに表示されているため、書き込んでいるレコードについては何もありません。誰か他のアイデアがここにありますか？
主なプログラムコードは次のとおりです。
package samplerc;
import sample.CreateUser;
public class CreateRecords
{
public static void main(String[] args)
{
try
{
String[][] userList =
{ { "rc", "1" },
{ "pbh", "2" },
{ "jbc", "3" }
};
CreateUser userCreator = new CreateUser();
userCreator.addUserList(userList);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
そしてここにCreateUserがあります：
package sample;
import org.hibernate.HibernateException;
import sample.dao.DAO;
import sample.entity.User;
public class CreateUser extends DAO
{
public void addUserList(String[][] userList)
throws Exception
{
try
{
for (int i=0; i<userList.length; i++)
{
create(userList[i][0], userList[i][1]);
System.out.println("Created user");
DAO.close();
}
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public User create(String username, String password) throws Exception
{
try
{
begin();
User user = new User(username, password);
getSession().save(user);
commit();
return user;
}
catch (HibernateException e)
{
throw new Exception("Could not create user " + username, e);
}
}
}
DAO基本クラスは以前ここにありました。私がそれを置き換えたので、それは今編集で下にあります：
Hibernate構成ファイル：
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.url"> jdbc:derby://localhost:1527/C:/Users/rcook/workspaceGalileoLaptop/BHChap3/BegHibernateDB</property>
<property name="hibernate.connection.driver_class"> org.apache.derby.jdbc.ClientDriver40 </property>
<property name="hibernate.connection.username">admin</property>
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.dialect"> org.hibernate.dialect.DerbyDialect </property>
<property name="hibernate.connection.pool_size">0</property>
<property name="hibernate.show_sql">false</property>
<!-- "Import" the mapping resources here -->
<mapping class="sample.entity.Message"/>
<mapping class="sample.entity.Advert"/>
<mapping class="sample.entity.Category"/>
<mapping class="sample.entity.User"/>
</session-factory>
</hibernate-configuration>
以前はログファイルがここにありました。投稿制限のため、以下の編集で別のログを取得したため、削除しました。
--Guidoの回答後に更新
Guido、それはとても素晴らしいアイデアでした。私はそれが正しいと確信していました。残念ながら、私が行った変更はそれを修正していないようです。これが新しいDAOクラスで、提案された変更があります。
package sample.dao;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class DAO
{
private static final Logger log = Logger.getAnonymousLogger();
private static SessionFactory sessionFactory = null;
private static final ThreadLocal threadLocalSession = new ThreadLocal();
protected DAO()
{
}
private static synchronized SessionFactory getSessionFactory()
{
if (sessionFactory == null)
{
sessionFactory = new Configuration().configure().buildSessionFactory();
}
return sessionFactory;
}
public static Session getSession()
{
String threadName = Thread.currentThread().getName();
System.out.println(String.format("getting session, thread = '%s'", threadName));
Session localSession = (Session) DAO.threadLocalSession.get();
if (localSession == null)
{
try
{
localSession = getSessionFactory().openSession();
DAO.threadLocalSession.set(localSession);
}
catch (HibernateException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return localSession;
}
protected void begin()
{
try
{
getSession().beginTransaction();
}
catch (HibernateException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
protected void commit()
{
try
{
getSession().getTransaction().commit();
}
catch (HibernateException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
protected void rollback()
{
try
{
getSession().getTransaction().rollback();
}
catch (HibernateException e)
{
log.log(Level.WARNING, "Cannot rollback", e);
}
try
{
getSession().close();
}
catch (HibernateException e)
{
log.log(Level.WARNING, "Cannot close", e);
}
DAO.threadLocalSession.set(null);
}
public static void close()
{
getSession().close();
// try { Thread.sleep(5000); } catch (InterruptedException ie) {}
DAO.threadLocalSession.set(null);
}
}
そして、これが新しいログファイルです。私はトレースステートメントに固執し、それが残りの出力に対して興味深い出力であることに気づきました。あなた（または他の誰か）が持っている他のアイデアは大歓迎です。
Starting...
getting session, thread = 'main'
Feb 19, 2013 10:25:21 AM org.hibernate.annotations.common.Version <clinit>
INFO: Hibernate Commons Annotations 3.2.0.Final
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.Environment <clinit>
INFO: Hibernate 3.6.10.Final
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: Bytecode provider name : javassist
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.Environment <clinit>
INFO: using JDK 1.4 java.sql.Timestamp handling
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
Feb 19, 2013 10:25:21 AM org.hibernate.util.DTDEntityResolver resolveEntity
WARNING: recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.Configuration doConfigure
INFO: Configured SessionFactory: null
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.AnnotationBinder bindClass
INFO: Binding entity from annotated class: sample.entity.Message
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.annotations.EntityBinder bindTable
INFO: Bind entity sample.entity.Message on table Message
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.AnnotationBinder bindClass
INFO: Binding entity from annotated class: sample.entity.Advert
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.annotations.EntityBinder bindTable
INFO: Bind entity sample.entity.Advert on table Advert
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.AnnotationBinder bindClass
INFO: Binding entity from annotated class: sample.entity.Category
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.annotations.EntityBinder bindTable
INFO: Bind entity sample.entity.Category on table Category
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.AnnotationBinder bindClass
INFO: Binding entity from annotated class: sample.entity.User
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.annotations.EntityBinder bindTable
INFO: Bind entity sample.entity.User on table AdUser
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.Configuration applyHibernateValidatorLegacyConstraintsOnDDL
INFO: Hibernate Validator not found: ignoring
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.search.HibernateSearchEventListenerRegister enableHibernateSearch
INFO: Unable to find org.hibernate.search.event.FullTextIndexEventListener on the classpath. Hibernate Search is not enabled.
Feb 19, 2013 10:25:21 AM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: Using Hibernate built-in connection pool (not for production use!)
Feb 19, 2013 10:25:21 AM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: Hibernate connection pool size: 0
Feb 19, 2013 10:25:21 AM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: autocommit mode: false
Feb 19, 2013 10:25:21 AM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: using driver: org.apache.derby.jdbc.ClientDriver40 at URL: jdbc:derby://localhost:1527/BegHibernateDB
Feb 19, 2013 10:25:21 AM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: connection properties: {user=admin, password=****}
Feb 19, 2013 10:25:21 AM org.hibernate.dialect.Dialect <init>
INFO: Using dialect: org.hibernate.dialect.DerbyDialect
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Database ->
name : Apache Derby
version : 10.8.1.2 - (1095077)
major : 10
minor : 8
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Driver ->
name : Apache Derby Network Client JDBC Driver
version : 10.8.1.2 - (1095077)
major : 10
minor : 8
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
WARNING: Could not obtain connection to query metadata
java.sql.SQLException: Cannot close a connection while a transaction is still active.
at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
at org.apache.derby.client.am.Connection.closeResourcesX(Unknown Source)
at org.apache.derby.client.am.Connection.closeX(Unknown Source)
at org.apache.derby.client.net.NetConnection.closeX(Unknown Source)
at org.apache.derby.client.am.Connection.close(Unknown Source)
at org.apache.derby.client.net.NetConnection.close(Unknown Source)
at org.apache.derby.client.net.NetConnection40.close(Unknown Source)
at org.hibernate.connection.DriverManagerConnectionProvider.closeConnection(DriverManagerConnectionProvider.java:160)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:143)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2863)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2859)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1870)
at sample.dao.DAO.getSessionFactory(DAO.java:25)
at sample.dao.DAO.getSession(DAO.java:39)
at sample.dao.DAO.begin(DAO.java:55)
at sample.CreateUser.create(CreateUser.java:77)
at sample.CreateUser.addUserList(CreateUser.java:61)
at samplerc.CreateRecords.main(CreateRecords.java:19)
Caused by: org.apache.derby.client.am.SqlException: Cannot close a connection while a transaction is still active.
at org.apache.derby.client.am.Connection.checkForTransactionInProgress(Unknown Source)
... 17 more
Feb 19, 2013 10:25:21 AM org.hibernate.dialect.Dialect <init>
INFO: Using dialect: org.hibernate.dialect.DerbyDialect
Feb 19, 2013 10:25:21 AM org.hibernate.transaction.TransactionFactoryFactory buildTransactionFactory
INFO: Using default transaction strategy (direct JDBC transactions)
Feb 19, 2013 10:25:21 AM org.hibernate.transaction.TransactionManagerLookupFactory getTransactionManagerLookup
INFO: No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Automatic flush during beforeCompletion(): disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Automatic session close at end of transaction: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Scrollable result sets: enabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: JDBC3 getGeneratedKeys(): disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Connection release mode: auto
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Default batch fetch size: 1
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Generate SQL with comments: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Order SQL updates by primary key: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Order SQL inserts for batching: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory createQueryTranslatorFactory
INFO: Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
Feb 19, 2013 10:25:21 AM org.hibernate.hql.ast.ASTQueryTranslatorFactory <init>
INFO: Using ASTQueryTranslatorFactory
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Query language substitutions: {}
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: JPA-QL strict compliance: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Second-level cache: enabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Query cache: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory createRegionFactory
INFO: Cache region factory : org.hibernate.cache.impl.NoCachingRegionFactory
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Optimize cache for minimal puts: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Structured second-level cache entries: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Statistics: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Deleted entity synthetic identifier rollback: disabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Default entity-mode: pojo
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Named query checking : enabled
Feb 19, 2013 10:25:21 AM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Check Nullability in Core (should be disabled when Bean Validation is on): enabled
Feb 19, 2013 10:25:22 AM org.hibernate.impl.SessionFactoryImpl <init>
INFO: building session factory
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [characters_clob] overrides previous : org.hibernate.type.PrimitiveCharacterArrayClobType@494eaec9
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [materialized_clob] overrides previous : org.hibernate.type.MaterializedClobType@4cb533b8
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [wrapper_materialized_blob] overrides previous : org.hibernate.type.WrappedMaterializedBlobType@c569c60
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [materialized_blob] overrides previous : org.hibernate.type.MaterializedBlobType@a3468f4
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [blob] overrides previous : org.hibernate.type.BlobType@76d67067
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [java.sql.Blob] overrides previous : org.hibernate.type.BlobType@76d67067
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [clob] overrides previous : org.hibernate.type.ClobType@786db724
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [java.sql.Clob] overrides previous : org.hibernate.type.ClobType@786db724
Feb 19, 2013 10:25:22 AM org.hibernate.type.BasicTypeRegistry register
INFO: Type registration [wrapper_characters_clob] overrides previous : org.hibernate.type.CharacterArrayClobType@11c7865b
Feb 19, 2013 10:25:22 AM org.hibernate.impl.SessionFactoryObjectFactory addInstance
INFO: Not binding factory to JNDI, no JNDI name configured
getting session, thread = 'main'
getting session, thread = 'main'
Created user
getting session, thread = 'main'
getting session, thread = 'main'
getting session, thread = 'main'
getting session, thread = 'main'
Created user
getting session, thread = 'main'
getting session, thread = 'main'
getting session, thread = 'main'
getting session, thread = 'main'
Created user
getting session, thread = 'main'