Sometimes you may not be able to start the Apache Tomcat App Server if it has not stopped properly. In such cases one has to kill its process. If your are on Mac OS X system or any other Unix server then to do this,
localhost:~ code2care$ ps -ef |grep -i 'catalina'
501 1144 623 0 6:59PM ?? 0:22.98 /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/java -Dcatalina.base=/Users/code2care/Setups/apache-tomcat-7.0.61 -Dcatalina.home=/Users/code2care/Setups/apache-tomcat-7.0.61 -Dwtp.deploy=/Users/code2care/Setups/apache-tomcat-7.0.61/wtpwebapps -Djava.endorsed.dirs=/Users/code2care/Setups/apache-tomcat-7.0.61/endorsed -Dfile.encoding=MacRoman -classpath /Users/code2care/Setups/apache-tomcat-7.0.61/bin/bootstrap.jar:/Users/code2care/Setups/apache-tomcat-7.0.61/bin/tomcat-juli.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/lib/tools.jar org.apache.catalina.startup.Bootstrap start
501 1262 1103 0 8:35PM ttys000 0:00.00 grep -i catalina
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