(HTTP Status 500)Request processing failed; nested exception is java.lang.NullPointerException
错误提示:
eclipse中图1:
eclipse中图1详细情况:
浏览器中报错提示:
错误原因:
改为这样:
错误就会消除:
结论:每用一个DAO层都要自动装配一下,多个DAO层不能只用一个自动装配(@Autowired),不然会报(Request processing failed; nested exception is java.lang.NullPointerException)错误。