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I get tired of this for a long time. I do not know what caused this error. Here are my files: Uzytkownik.hbm.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="Uzytkownik" table="uzytkownicy"> <id column="id" name="id" type="int"/> <property column="login" generated="never" lazy="false" name="login" type="string"/> <property column="haslo" generated="never" lazy="false" name="haslo" type="string"/> </class> </hibernate-mapping> hibernate.cfg.xml: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory name=""> <property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property> <property name="hibernate.connection.password">root</property> <property name="hibernate.connection.url">jdbc:mysql://localhost/sprawozdania</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property> <mapping resource="com/vaannila/uzytkownik/Uzytkownik.hbm.xml"/> </session-factory> </hibernate-configuration> I use mysql 5.5. I get the following error: Exception in thread "main" java.lang.ExceptionInInitializerError at com.vaannila.util.HibernateUtil.<clinit>(HibernateUtil.java:14) at com.vaannila.uzytkownik.Main.saveUzyt(Main.java:22) at com.vaannila.uzytkownik

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