[英]Java hibernate throws Exception at boot
我現在正在使用Hibernate處理項目,但是運行項目時出現錯誤。
在server.java(我的入口點)上,我得到了:
private static HibernateUtil hibernateUtil;
在我的入口點:
hibernateUtil = new HibernateUtil();
這是我的HibernateUtil類:
public class HibernateUtil {
private SessionFactory sessionFactory;
public HibernateUtil() {
StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
try {
sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory();
}
catch (Exception e) {
StandardServiceRegistryBuilder.destroy( registry );
}
}
public SessionFactory getSessionFactory() {
return sessionFactory;
}
}
現在我的Hibernate.cf.xml:
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">123</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/dynamicdb</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<property name="show_sql">false</property>
<property name="connection.pool_size">1</property>
</session-factory>
現在這是我得到的錯誤:
Jun 18, 2016 1:17:17 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.0.Final}
Jun 18, 2016 1:17:17 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Jun 18, 2016 1:17:17 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Jun 18, 2016 1:17:18 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
Jun 18, 2016 1:17:18 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
Jun 18, 2016 1:17:18 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [com.mysql.cj.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/dynamicdb]
Jun 18, 2016 1:17:18 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {user=root, password=****}
Jun 18, 2016 1:17:18 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
Jun 18, 2016 1:17:18 PM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 1 (min=1)
Jun 18, 2016 1:17:18 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
INFO: HHH10001008: Cleaning up connection pool [jdbc:mysql://localhost:3306/dynamicdb]
Jun 18, 2016 1:17:18 PM org.hibernate.service.internal.AbstractServiceRegistryImpl stopService
INFO: HHH000369: Error stopping service [class org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl] : java.lang.NullPointerException
我正在帶有MAMP的Mac OS X 10.10上運行Eclipse mars 2。 MySQL正在運行,並且數據庫用戶和數據庫存在並且密碼正確。 有什么問題?
我有和你一樣的問題。 看來我們倆都從Hibernate Official代碼示例中復制了代碼。 我認為這可能是mysql connecotrj 6.0的bug。在catch語句中添加throw語句后:
final StandardServiceRegistry registry = new StandardServiceRegistryBuilder()
.configure()
.build();
try {
sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory();
} catch (Exception e) {
StandardServiceRegistryBuilder.destroy(registry);
throw new RuntimeException(e);
}
我發現原產地例外:
Caused by: com.mysql.cj.core.exceptions.InvalidConnectionAttributeException: The server time zone value '�й���ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
這種情況在mysql connectorj 5.1中沒有出現
因此,有兩種解決方案:開關MySQL的JDBC驅動程序到5.1或添加時區參數JDBC URL字符串像這樣 。 在hibernate.cfg.xml文件中,不要忘記將&更改為&
當我的映射文件兩次包含一列時,我遇到了同樣的問題
<property column="STATE" name="state" type="java.lang.String" not-null="true"/>
<property column="BRANCH" name="branch" type="java.lang.String" not-null="true"/>
<property column="COUNTRY" name="country" type="java.lang.String" not-null="true"/>
<property column="STATE" name="state" type="java.lang.String" not-null="true"/>
因此,一旦我將一種狀態更改為適當的屬性,例如
<property column="SITE" name="site" type="java.lang.String" not-null="true"/>
問題已解決。 所以要小心你的映射
就我而言,我使用的是Netbeans,而我的實體僅使用Netbeans生成。
擺弄mysql和hibernate-core jar版本后,在評論@NamedQueries后為我修復了它。
對於可能仍然遇到此問題的其他人,需要存在連接URL中提供的數據庫,在這種情況下,我們需要確保數據庫dynamicdb存在。 我有同樣的問題,並解決了它。
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