mybaties报错：查询数据时，没有给无参构造报错

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Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.coci.entity.User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.coci.entity.User.<init>()
### The error may involve com.coci.entity.findById-Inline
### The error occurred while setting parameters
### Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.coci.entity.User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.coci.entity.User.<init>()
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:61)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:53)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:38)
at com.coci.test.Test1.findUserById(Test1.java:81)
at com.coci.test.Test1.main(Test1.java:20)
Caused by: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.coci.entity.User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.coci.entity.User.<init>()
at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:54)
at org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:16)
at org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:11)
at org.apache.ibatis.executor.resultset.FastResultSetHandler.createResultObject(FastResultSetHandler.java:301)
at org.apache.ibatis.executor.resultset.FastResultSetHandler.createResultObject(FastResultSetHandler.java:286)
at org.apache.ibatis.executor.resultset.FastResultSetHandler.getRowValue(FastResultSetHandler.java:188)
at org.apache.ibatis.executor.resultset.FastResultSetHandler.handleRowValues(FastResultSetHandler.java:145)
at org.apache.ibatis.executor.resultset.FastResultSetHandler.handleResultSet(FastResultSetHandler.java:121)
at org.apache.ibatis.executor.resultset.FastResultSetHandler.handleResultSets(FastResultSetHandler.java:98)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:40)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:55)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:41)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:95)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:72)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:59)
... 4 more
Caused by: java.lang.NoSuchMethodException: com.coci.entity.User.<init>()
at java.lang.Class.getConstructor0(Class.java:2810)
at java.lang.Class.getDeclaredConstructor(Class.java:2053)
at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:27)

... 18 more

原因：

没有给实体类，无参的构造函数

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