ejb + JPA Multi-аренда с hibernate4, не удалось завершить обновление схемы: java.lang.NullPointerException

Question

Теперь у меня есть приложение с jpa (hibernate4) mutlitenancy, но есть некоторые исключения, я использую ejb3 + jpa + wildfly, I не знаю, где это не так, только одно сообщение java lang nullponinterexception:

Could not complete schema update: java.lang.NullPointerException 
    at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:51) [hibernate-core-4.3.5.Final.jar:4.3.5.Final] 
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:194) [hibernate-core-4.3.5.Final.jar:4.3.5.Final] 
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:178) [hibernate-core-4.3.5.Final.jar:4.3.5.Final] 
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:522) [hibernate-core-4.3.5.Final.jar:4.3.5.Final] 
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1857) [hibernate-core-4.3.5.Final.jar:4.3.5.Final] 
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850) [hibernate-entitymanager-4.3.5.Final.jar:4.3.5.Final] 
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:843) [hibernate-entitymanager-4.3.5.Final.jar:4.3.5.Final] 
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:397) [hibernate-core-4.3.5.Final.jar:4.3.5.Final] 
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:842) [hibernate-entitymanager-4.3.5.Final.jar:4.3.5.Final] 
    at org.jboss.as.jpa.hibernate4.TwoPhaseBootstrapImpl.build(TwoPhaseBootstrapImpl.java:44) [jipijapa-hibernate4-3-1.0.1.Final.jar:] 
    at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:154) [wildfly-jpa-8.1.0.Final.jar:8.1.0.Final] 
    at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:117) [wildfly-jpa-8.1.0.Final.jar:8.1.0.Final] 
    at java.security.AccessController.doPrivileged(Native Method) [rt.jar:1.8.0_25] 
    at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:474) [wildfly-security-manager-1.0.0.Final.jar:1.0.0.Final] 
    at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:182) [wildfly-jpa-8.1.0.Final.jar:8.1.0.Final] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_25] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_25] 
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_25] 
    at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.1.1.Final.jar:2.1.1.Final] 


there are my persistence.xml 、 MultiTenantConnectionProviderImpl and CurrentTenantIdentifierResolverImpl 

persistence.xml 

     <persistence-unit name="basic-entity" 
     transaction-type="JTA"> 

     <!-- <provider>net.bull.javamelody.JpaPersistence</provider> --> 
     <provider>org.hibernate.ejb.HibernatePersistence</provider> 




     <jta-data-source>java:jboss/datasources/JcMysqlDS</jta-data-source> 

     <properties> 
      <property name="hibernate.connection.username" value="root" /> 
      <property name="hibernate.connection.password" value="123456" /> 
      <property name="hibernate.connection.autocommit" value="true"/> 
      <property name="hibernate.transaction.flush_before_completion"  value="true"/> 
      <property name="hibernate.c3p0.min_size" value="5"/> 
      <property name="hibernate.c3p0.max_size" value="32"/> 
      <property name="hibernate.c3p0.timeout" value="15"/> 
      <property name="hibernate.c3p0.max_statements" value="10"/> 
      <property name="hibernate.c3p0.idle_test_period" value="300"/> 
      <property name="hibernate.c3p0.unreturnedConnectionTimeout" value="95"/> 
      <property name="hibernate.c3p0.debugUnreturnedConnectionStackTraces" 
       value="true"/> 

      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" 
       /> 
      <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itoo_basic" 
       /> 
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" /> 
      <!-- <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/> --> 
      <property name="hibernate.hbm2ddl.auto" value="update" /> 
      <property name="hibernate.show_sql" value="true" /> 

<property name="hibernate.default_schema" value="public"/> 
      <property name="hibernate.multi_tenant_connection_provider" 
      value="com.my.multi.MultiTenantConnectionProviderImpl"/> 


      <property name="hibernate.tenant_identifier_resolver" 
      value="com.my.multi.CurrentTenantIdentifierResolverImpl" 
       /> 
      <property name="hibernate.multiTenancy" value="SCHEMA" /> 
     </properties> 
    </persistence-unit> 

CurrentTenantIdentifierResolverImpl 

     public class CurrentTenantIdentifierResolverImpl implements CurrentTenantIdentifierResolver { 

     @Override 
     public String resolveCurrentTenantIdentifier() { 
     return "public"; 
     } 

     @Override 
     public boolean validateExistingCurrentSessions() { 
     return false; 
    } 
} 

class MultiTenantConnectionProviderImpl 

    public class MultiTenantConnectionProviderImpl implements 
     MultiTenantConnectionProvider, Stoppable, ServiceRegistryAwareService  { 
    /** 
    * 
    */ 
     private static final long serialVersionUID = -5121435319787325293L; 
     private C3P0ConnectionProvider connectionProvider =null; 

     @Override 
     public boolean isUnwrappableAs(Class arg0) { 
     // TODO Auto-generated method stub 
     return false; 
     } 

     @Override 
     public <T> T unwrap(Class<T> arg0) { 
     // TODO Auto-generated method stub 
     return null; 
     } 

     @Override 
     public void stop() { 
     // TODO Auto-generated method stub 

     } 

     @Override 
     public Connection getAnyConnection() throws SQLException { 
     return connectionProvider.getConnection(); 
     } 

     @Override 
     public Connection getConnection(String tenantIdentifier) 
      throws SQLException { 
     final Connection connection = getAnyConnection(); 
     try { 
      connection.createStatement().execute("USE itoo_basic " ); 
     } catch (SQLException e) { 
      throw new HibernateException(
        "Could not alter JDBC connection to specified schema [" 
          + tenantIdentifier + "]", e); 
     } 
     return connection; 
    } 

     @Override 
     public void releaseAnyConnection(Connection connection) throws SQLException { 
     // TODO Auto-generated method stub 
     connectionProvider.closeConnection(connection); 
     //lazyDatasource.getConnection().close(); 
    } 

     @Override 
     public void releaseConnection(String tenantIdentifier, Connection connection) 
      throws SQLException { 
     try { 
      connection.createStatement().execute("USE master"); 
     } catch (SQLException e) { 
      // on error, throw an exception to make sure the connection is not 
      // returned to the pool. 
      // your requirements may differ`enter code here` 
      throw new HibernateException(
        "Could not alter JDBC connection to specified schema [" 
          + tenantIdentifier + "]", e); 
     } 
     connectionProvider.closeConnection(connection); 
     //lazyDatasource.getConnection().close(); 

     } 

     @Override 
     public boolean supportsAggressiveRelease() { 
     // TODO Auto-generated method stub 
     return false; 
     } 

     @Override 
     public void injectServices(ServiceRegistryImplementor serviceRegistry)  { 
     // TODO Auto-generated method stub 

      Map lSettings =  serviceRegistry.getService(ConfigurationService.class).getSettings(); 

     connectionProvider = new C3P0ConnectionProvider(); 
     connectionProvider.injectServices(serviceRegistry); 
      connectionProvider.configure(lSettings); 
     } 

     } 

Я использую схему. Кто-нибудь может мне помочь?

Answer 1

Если вы посмотрите на код в org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(Map), вы увидите, что он заполняет провайдера соединений по умолчанию со значением null. Таким образом, обновление схемы с Hibernate терпит неудачу и бросает этот неприятный NullPointerException.

Это потому, что при запуске приложения будет обновляться только схема по умолчанию - и если вы переключитесь на другую, она может не обновиться.

Таким образом, решение состоит в том, чтобы отключить линию <property name="hibernate.hbm2ddl.auto" value="update" /> и обновить схемы самостоятельно.