Troubleshooting with apache Tomcat 7 steps should be followed ....

after downloading apache-Tomcat 7 // open terminal go to that downloading file folder in which tar.gz file is still.

Untar the tar file

• tar -xzvf filename.tar.gz

  move a extracted directory of apache-Tomcat7 in current path

• sudo mv Directory_Name(Extracted eg.apache-Tomcat 7.0.32) /usr/local/Tomcat7

to set environment variable for Tomcat7

• sudo nano /usr/local/Tomcat7/bin/setenv.sh

then Nano editor will open ..

 JAVA_HOME =/usr/lib/jvm/java-6-sun
 export CATALINA_OPTS="$CATALINA_OPTS -Xms128m -Xmx1024m -XX:MaxPermSize=256m

after hit ctrl+X to save file

• to set the role and username and password.

sudo nano /usr/local/Tomcat7/conf/./tomcat-users.xml

<role rolename="manager-gui" />
<role rolename="manager-script" />
<role rolename="manager-jmx" />
<role rolename="manager-status" />
<user username="admin" password="admin" roles="manager-gui,manager-script,manager-jmx,manager-status"/>

Ctrl+X to save file

• If Port no confliction comes in a way then open file to change the port no.

sudo nano /usr/local/Tomcat7/conf/./server.xml

then change the connector port as you want....