Hi, When I used static map in dao.xml with following code, there is no problem! dao.xml: <dao interface="org.tri.sadam.persistence.iface.SchemaDao" implementation="org.tri.sadam.persistence.dao.sqlserver.SQLServerSchemaDao"/ > Java code: SchemaDao home = (SchemaDao)manager.getDao(SchemaDao.class); List list = home.getSchemaList();
However, my real case is the implementation class (e.g. SQLServerSchemaDao,or MySQLSchemaDao) should be determined dynamically in the java code instead of putting in static xml mapping file. But when I used the following code: // SchemaDao home = (SchemaDao)manager.getDao(SchemaDao.class); SchemaDao home = new SQLServerSchemaDao(manager); List list = home.getSchemaList(); iBATIS throw the following exception. It look like DaoImpMap cannot get a DaoImp from this dao context. How to improve my program fix this problem? Thanks! java.lang.NullPointerException at com.ibatis.dao.engine.impl.StandardDaoManager.getTransaction(StandardDaoMana ger.java:108) at com.ibatis.dao.client.template.SqlMapDaoTemplate.getSqlMapExecutor(SqlMapDao Template.java:60) at com.ibatis.dao.client.template.SqlMapDaoTemplate.queryForList(SqlMapDaoTempl ate.java:203) at org.tri.sadam.persistence.dao.sqlserver.SQLServerSchemaDao.getSchemaList(SQL ServerSchemaDao.java:22) at org.tri.sadam.test.SchemaTest.main(SchemaTest.java:37)
