Hibernate框架中,log4j异常问题。求各位大神帮帮忙! log4j:ERROR Failed to excute sql java.sql.SQLException: No suitable driver found for jdbc:oracle:thin:@90.0.12.20:1521:ORCL at java.sql.DriverManager.getConnection(DriverManager.java:602) at java.sql.DriverManager.getConnection(DriverManager.java:185) at org.apache.log4j.jdbc.JDBCAppender.getConnection(JDBCAppender.java:212) at org.apache.log4j.jdbc.JDBCAppender.execute(JDBCAppender.java:175) at org.apache.log4j.jdbc.JDBCAppender.flushBuffer(JDBCAppender.java:250) at org.apache.log4j.jdbc.JDBCAppender.append(JDBCAppender.java:146) at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251) at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders (AppenderAttachableImpl.java:66) at org.apache.log4j.Category.callAppenders(Category.java:206) at org.apache.log4j.Category.forcedLog(Category.java:391) at org.apache.log4j.Category.log(Category.java:856) at org.apache.commons.logging.impl.Log4JLogger.warn(Log4JLogger.java:157) at net.sf.ehcache.config.Configurator.configure(Configurator.java:126) at net.sf.ehcache.CacheManager.configure(CacheManager.java:166) at net.sf.ehcache.CacheManager.<init>(CacheManager.java:138) at net.sf.ehcache.CacheManager.create(CacheManager.java:193) at org.hibernate.cache.EhCacheProvider.start(EhCacheProvider.java:130) at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:173) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1176) at com.cn.hibernate.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:31) at com.cn.test.TestHibernate.main(TestHibernate.java:35)