com.ibatis.common.jdbc.exception.NestedSQLException：Error setting property...

今天一直配Ibatis的时候一直报这个错误，用的是Oracle数据库。

com.ibatis.common.jdbc.exception.NestedSQLException:   
--- The error occurred in User.xml.  
--- The error occurred while applying a result map.  
--- Check the selectAllUser-AutoResultMap.  
--- The error happened while setting a property on the result object.  
--- Cause: java.lang.RuntimeException: Error setting property 'setAge' of 'com.ibatis.model.UserInfo@78a212'.  Cause: java.lang.IllegalArgumentException
    at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:188)
    at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForList(GeneralStatement.java:123)
    at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:615)
    at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:589)
    at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118)
    at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:122)
    at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:99)
    at com.ibatis.dao.UserDao.findAll(UserDao.java:51)
    at com.ibatis.dao.UserDao.main(UserDao.java:66)
Caused by: java.lang.RuntimeException: Error setting property 'setAge' of 'com.ibatis.model.UserInfo@78a212'.  Cause: java.lang.IllegalArgumentException
    at com.ibatis.sqlmap.engine.accessplan.PropertyAccessPlan.setProperties(PropertyAccessPlan.java:52)
    at com.ibatis.sqlmap.engine.exchange.JavaBeanDataExchange.setData(JavaBeanDataExchange.java:112)
    at com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setResultObjectValues(BasicResultMap.java:373)
    at com.ibatis.sqlmap.engine.mapping.statement.RowHandlerCallback.handleResultObject(RowHandlerCallback.java:64)
    at com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults(SqlExecutor.java:382)
    at com.ibatis.sqlmap.engine.execution.SqlExecutor.handleMultipleResults(SqlExecutor.java:301)
    at com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery(SqlExecutor.java:190)
    at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery(GeneralStatement.java:205)
    at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:173)
    ... 8 more
Caused by: java.lang.IllegalArgumentException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.ibatis.sqlmap.engine.accessplan.PropertyAccessPlan.setProperties(PropertyAccessPlan.java:46)
    ... 16 more
Exception in thread "main" java.lang.NullPointerException
    at com.ibatis.dao.UserDao.main(UserDao.java:66)

找了很多帮助，有说连接池问题的，重启服务后仍不能解决。后来再网上查完后才恍然大悟，原来我的测试数据中int类型的列是null，当查询转换时，不能把null转换成int类型，导致产生异常。

解决方法：

1.填充数据库里的列类型为int的列的数据(有点治标不治本)。

2.加入isnull判断