I want to know how to build the jasperserver code and make changes in it .
where the final jasperserver file is stored after building the source code .
how to start my jasperserver ?
after you've done building the project you should get the WAR archive. You'll need to deploy that WAR archive to an application server of your choice following the Installation Guide section about WAR files. In short you'll need to use buildomatic tool that will create the databases for the JasperServer, fill them with required info, configure the WAR file and deploy it to the application server. Once deployment is successful you'll need to launch application sever and access the application from your browser