Exception in thread "main" java.lang.NoSuchMethodError: org.apache.log4j.Logger.isTraceEnabled()Z

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Exception in thread "main" java.lang.NoSuchMethodError: org.apache.log4j.Logger.isTraceEnabled()Z
at org.apache.ibatis.logging.log4j.Log4jImpl.isTraceEnabled(Log4jImpl.java:37)
at org.apache.ibatis.logging.jdbc.BaseJdbcLogger.isTraceEnabled(BaseJdbcLogger.java:127)
at org.apache.ibatis.logging.jdbc.ResultSetLogger.invoke(ResultSetLogger.java:64)
at com.sun.proxy.$Proxy2.next(Unknown Source)
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.shouldProcessMoreRows(DefaultResultSetHandler.java:310)
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:289)
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:266)
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:236)
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:153)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:57)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:70)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:57)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:259)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:132)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:104)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:94)

at chapter_1.one.FirstTest.main(FirstTest.java:30)

导入的log4j.jar与mybatis.jar里面的log4j冲突了，去掉log4j.jar就好了！

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