Tomcat6 + custom instrumentation

Tomcat+custom instrumentation.txt

//instructions for instrumenting a tomcat app and adding custom instrumentation

apt-get update
//Install the needfull java stuff
apt-get install -y tomcat6 ant openjdk-7-jdk

//install traceview base package
wget files.appneta.. yada yada yada

//install java instrumentation
sudo apt-get install tracelytics-java-agent tracelytics-java-agent-native

//Make Tomcat load our agent (tomcat's init script loads options from this file if it exists: setenv.sh ) 
nano /usr/share/tomcat6/bin/setenv.sh
#!/bin/sh
JAVA_OPTS="$JAVA_OPTS -javaagent:/usr/local/tracelytics/tracelyticsagent.jar"

//make a Java app
cd /var/lib/tomcat6/webapps
mkdir sample
cd sample
mkdir WEB-INF
cd WEB-INF
mkdir {src,classes,lib}


//make the following files:

./web.xml
//
<?xml version="1.0" encoding="ISO-8859-1"?> 

<!DOCTYPE web-app
	PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
	"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

	<servlet>
		<servlet-name>process</servlet-name>
		<servlet-class>process</servlet-class>
	</servlet>
	
	<servlet-mapping>
				<servlet-name>process</servlet-name>
				<url-pattern>/process</url-pattern>
	</servlet-mapping>
		 
</web-app>

./src/process.java
//
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.tracelytics.api.ext.*;

public class process extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		try {
			Thread.sleep(500);
		} catch(InterruptedException ex){
			Thread.currentThread().interrupt();
		}
		TraceEvent event = Trace.createEntryEvent("Custom_Middle_Layer");
		event.report();
		PrintWriter out = response.getWriter();
		out.println("Hello World");
		try {
                        Thread.sleep(200);
                } catch(InterruptedException ex){
                        Thread.currentThread().interrupt();
                }

		TraceEvent new_event = Trace.createExitEvent("Custom_Middle_Layer");
		new_event.report();
	}
}

//


//cp some servlet class into this apps classes folder
cp /usr/share/tomcat6/lib/servlet-api.jar /var/lib/tomcat6/webapps/sample/WEB-INF/lib/

//cp our API jar to the same spot 
cp /usr/local/tracelytics/tracelytics-api.jar /var/lib/tomcat6/webapps/sample/WEB-INF/lib/

//move to src
cd /var/lib/tomcat6/webapps/sample/WEB-INF/src
//compile the process.java with the proper classpaths
javac -cp ../lib/tracelytics-api.jar:../lib/servlet-api.jar process.java

//move the newly created class to ../classes
cp process.class ../classes




service tomcat6 restart

curl localhost:8080/sample/process