A summary of the problems in the Java Web development process

1:java Many packages are not available

Workaround: Open the Libraries file to see JRE System Library[java] library in the absence, if not, to import this yourself: Right-click the project->properties->java Build path->libraries- >add Library

2:java file test load MySQL driver and create connection connection no problem, but the front-end JSP page always appears with a null pointer problem when calling the DAO class through the servlet (requires a database connection)

FIX: Debug discovery database is not connected ..... Because I did not put the Mysql-connector-java-5.1.7-bin.jar drive bag under the web-inf\lib ..... Hey

A summary of the problems in the Java Web development process