为什么要配置classpath变量？ 配置classpath变量，才能使得java解释器知道到哪里去找标准类库，这些标准类库是别人已经写好了的，我们只管使用。

Groovy‘s RootLoader is a handy class that can be used to encapsulate a Groovy script’s reference to external classpath dependencies within the script itself. The documentation for RootLoader ...

I have an inkling that when developers ask how to deploy a JAR file to Tomcat, they actually mean to ask where JAR files should be placed to ensure they are part of the Apache Tomcat classpath at ...

The persistence.xml file is not located in a folder named META-INF. The META-INF folder is not on the project’s classpath. You don’t have a persistence.xml file. Your Hibernate libraries are not set ...