java.sql.SQLException: Cannot create com.liqi.entry.User: com.li.entry.User Query: SELECT * from u

java.sql.SQLException: Cannot create com.liqi.entry.User: com.liqi.entry.User Query: SELECT * from users where sex = ? Parameters: [女]
   at org.apache.commons.dbutils.AbstractQueryRunner.rethrow(AbstractQueryRunner.java:320)
   at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:349)
   at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:287)
   at com.liqi.test.Test1.queryUsers(Test1.java:66)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
   at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
   at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
   at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
   at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
   at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
   at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
   at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
   at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
   at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

错误原因：我在单元测试中User自提供了有参，忘记提供无参了。在使用如下语句查询的时候，User作为参数传递了，我们这单元测试中需要提供相应的构造方法，这里是无参。

queryRunner.query(sql, new BeanListHandler<User>(User.class), "女")语句中的 new BeanListHandler<User>(User.class) 是以类的字节码为参数的，实际上就是利用无参构造器

解决办法：直接在模型中加入无参构造函数，就OK了。

public void queryUsers(){QueryRunner queryRunner = new QueryRunner(DruidDBUtil.getDataSource());String sql = "SELECT * from users where sex = ?";try {List<User> userList = queryRunner.query(sql, new BeanListHandler<User>(User.class), "女");} catch (SQLException e) {e.printStackTrace();}}

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java.sql.SQLException: Cannot create com.liqi.entry.User: com.li.entry.User Query: SELECT * from u

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