Record a small JSP bug

learn Java It's been a long time ,jsp I haven't done it for a long time , I made some mistakes in my homework this time bug Make a note of （ I'm in a good mood, or I won't record it ）

first ：

Because we are maven project , But the database requires Oracle, The main window here has been tested and there is no problem , However, once running, it will report an error saying that the drive failed

Because our local warehouse does not Oracle Rely on the , So we guided the package

There are two ways to guide the package ：

1. Project Producture Medium libaries Import jar package

2. stay WEB-INF Set up under the lib Directory import jar Right click after package as xxx Here it is

At this time, another problem arises Maven project , There will be some problems with the first kind of guide package , The specific reasons have not been thoroughly explored ,debug It is found that there is still a problem in the connection, which indicates that this is Maven This is not the case in the project , The second one is safer ;

If you want to solve the first problem ：

need maven Compile the

 <resources>
  <resource>
    <directory>lib</directory>
    <targetPath>BOOT-INF/lib/</targetPath>
    <includes>
      <include>**/*.jar</include>
    </includes>
  </resource>
</resources>

 <compilerArguments>
      <!--  Package local jar package  -->
      <extdirs>${project.basedir}/lib</extdirs>
  </compilerArguments>

 、

the second , The main class could not be found and could not be loaded

I was stunned , I found JDBC The main program of does not run code , Or an error ,rebuild Not yet. ;

After my thinking, I got , Because our project has constituted , Then I'm because after the build , Copied code from other places ;

after rebuild I checked the bytecode and found that some files didn't ;

At this point we need to project structure in Modules Delete all the configurations in , And then reconfigure , Again rebuild I found all of them , There is no problem

IDEA appear Module ** must not contain source root **. The root already belongs to module ** Solutions to such errors Similar to the above solution , Most of this is because module problem