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org.hibernate.tool.schema.spi.SchemaManagementException: Unable to execute schema management to JDBC target [alter table My add column Ul integer] at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:58) at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlString(SchemaMigratorImpl.java:332) at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlStrings(SchemaMigratorImpl.java:350) at org.hibernate.tool.schema.internal.SchemaMigratorImpl.migrateTable(SchemaMigratorImpl.java:159) at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigrationToTargets(SchemaMigratorImpl.java:101) at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:59) at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:129) at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:97) at Test.main(Test.java:41)Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Duplicate column name 'Ul' at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:422) at com.mysql.jdbc.Util.handleNewInstance(Util.java:389) at com.mysql.jdbc.Util.getInstance(Util.java:372) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:980) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3835) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3771) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2531) at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1618) at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1549) at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:55) ... 8 more