Java web part problem and solution

The
error is based on the number of errors that occur in the writing process. Careful examination, rigorous scholarship!

JSP images cannot display properly?
found problem: path problem, path is incomplete.

shows a serious error, how many lines:
is generally in the select statement related character input error, carefully check.

request-getparameter (” ID “) where the parameter comes from
where the JSP page jumps over, the ID is the ID from the jump join of that page.

solve the import project, add Tomcat and JDK after the project appears Red Cross : modify the JDK version of the project and eclipse version of the JDK version. J compiler and project facts in
project (JAVA, WWM, and runtimes modified Tomcat version on the right).

Java web project, after starting Tomcat, display:
information.
describes a source server that was unable to find a representation of the target resource or was unwilling to expose an existing representation of the resource.
tries to find that since there was a related shop project originally, although the name was changed later, the new import project named shop was affected. When adding to Tomcat, the Path name was shop3 in web modules, and when accessing with the browser, it should be noted that the Path name was shop3 instead of shop.

2020.10.18
eclipse json file error, because eclipse thinks that json file does not need annotation, so compile error.
address: Prefrences, validation, json validator, cancel manual, build. Again, right click and validation on the json file that is in error.

valicat trial expires, modify system time before the probation period:
address: https://jingyan.baidu.com/article/adc815133376b6b622bf7354.html