BeanInstantiationException Could not instantiate bean class [User]Is it an abstract class?;

阿新 • • 發佈：2018-12-25

錯誤資訊如下

org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [cn.com.day03.User]: Is it an abstract class?; nested exception is java.lang.InstantiationException: cn.com.day03.User
   at org.springframework.beans.BeanUtils.instantiate(BeanUtils.java:81)
   at org.springframework.jdbc.core.BeanPropertyRowMapper.mapRow(BeanPropertyRowMapper.java:236)
   at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:93)
   at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:60)
   at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:706)
Caused by: java.lang.InstantiationException: cn.com.day03.User
   at java.lang.Class.newInstance0(Class.java:357)

原因：

User類裡面沒有無參的構造器

在Spring操作的整個流程中，要注意的是類（有屬性的）裡面一定要有無參的構造方法；

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