org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update

Exception in thread "main" org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:90)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)
 at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
 at com.jdbc.TestClass.main(TestClass.java:23)
Caused by: java.sql.BatchUpdateException: ORA-00942: 表或视图不存在

 at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:343)
 at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10720)
 at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
 ... 8 more
是由于我在设置配置文件的过程中使用了错误的帐号sys,应该使用scott
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
 <class name="com.jdbc.Student" schema="sys">
  <id name="id" column="id">
   <generator class="sequence"></generator>
  </id>
  <property name="username" />
    </class>
 
</hibernate-mapping>