eclipse develop google app engine

1.download eclipse and etract it to one folder
# tar zxvf eclipse-reporting-juno-SR2-linux-gtk-x86_64.tar.gz

2.install google app engine plugin
click help menu and under install new software subitem
add new websit
name: googleAppEngine
url: http://dl.google.com/eclipse/plugin/4.2

3. install packages for gwt designer
#sudo apt-get install libwebkitgtk-1.0.0

ubuntu 12.04 install tomcat7 and eclipse

1.install tomcat 7
#apt-get install tomcat7 tomcat7-admin tomcat7-docs tomcat7-examples tomcat7-user

2. download eclipse and install it to system

3. remove the file in eclipse project  workspace/.metadata/.plugins/org.eclipse.core.runtime/.settings
#cd /home/myproject/workspace/.metadata/.plugins/org.eclipse.core.runtime/.settings
# rm org.eclipse.jst.server.tomcat.core.prefs

4. ensure eclipse can access tomcat file

#cd /usr/share/tomcat7

#sudo ln -s /var/lib/tomcat7/conf conf

#sudo ln -s /etc/tomcat7/policy.d/03catalina.policy conf/catalina.policy

#sudo ln -s /var/log/tomcat7 log

#sudo chmod -R 777 /usr/share/tomcat7/conf

5.make user /usr/share/tomcat7 had read permission by all user

#cd /usr/share/tomcat7/conf

#sudo chmod 644 tomcat-users.xml

6.on eclipse create runtime-environment

Window->Preferences->Server->RunTime Environment

7.create new run server 

windows->show view->servers