When a JSP is compiled, a package is created for it. The package name starts with jspc. For example, the generated package name for ~/SOURCE/JSP/myjsps/hello.jsp is precompiled as jspc -webapp ~/SOURCE -d ~/test1/test2/test3. The generated servlet is located in ~/test1/test2/test3/org/apache/jsp/JSP/myjsps/hello_jsp.java and defined in org.apache.jsp.JSP.myjsps. The path for hello.jsp is derived from the directory in which the JSP is located.
In another example, the same hello.jsp is precompiled using the —p option, and is precompiled as jspc -webapp ~/SOURCE -d ~/test1/test2/test3 -p app1.app2.app3. The generated servlet is located in ~/test1/test2/test3/app1/app2/app3/JSP/myjsps/hello_jsp.java and defined inside package app1.app2.app3.JSP.myjsps. Note that the package specified with the -p option (app1.app2.app3) overrides the standard org.apache.jsp but does not affect the package derived from the directory in which the JSP is located. Also, note that the -d option does not affect on the generated package name.