Lesson 5

docs/javaBootcampNoEclipse.org

@@ -46,7 +46,7 @@
       : git checkout lesson-1
 
 ** Lesson 1 -- compile the code.
-   
+
 *** Starting point
     A clean git working area
 
@@ -159,3 +159,48 @@
        app.
     5. Test the application. If all is well, move on to lesson 5:
        : git checkout lesson-5
+
+** Lesson 5 -- Add new functionality
+
+*** Starting point
+    A clean working brought up to date to include the two new files:
+    =${DEV_HOME}/source/java/org/gibiris/javaBootcampNoEclipse/AstroFun.java=
+    and =${DEV_HOME}/source/lib/AstroLib-1.1.5ws.jar=, and an update
+    to
+    =${DEV_HOME}/source/java/org/gibiris/javaBootcampNoEclipse/MyHelloWorldServlet.java=.
+
+*** Goal
+    A working, updated application deployed to tomcat
+
+*** Steps
+    0. [@0] Pre-steps
+       - Make sure your environment is set up as per the previous lessons:
+         + =DEV_HOME= is set to where the git repository is cloned to
+         + =CLASSPATH= contains =tomcat8-servlet-api.jar=
+       - Clean out the working area if there are unnecessary/unwanted files:
+         : rm -vf ${DEV_HOME}/source/java/org/gibiris/javaBootcampNoEclipse/*.class
+         : rm -vf ${DEV_HOME}/source/lib/javaBootcampNoEclipse.?ar
+         : rm -vfr ${DEV_HOME}/webapp
+       - Review the changes that have been applied to the working area
+    1. Compile the java files (including the new java file) as per
+       Lesson 1.
+
+       Does it compile? If not, why. Two hints:
+       - there was a new jar file introduced to the repository
+       - there's a bug in the package specification in the new java
+         file. Looking closely at the branches of this git repository,
+         you might even find a fix for it.
+
+    2. Build the jar file as per Lesson 2 (except, this time, the
+       =lib= directory exists already).
+
+    3. Build the war file as per Lesson 3.
+
+    4. Deploy the updated application as per lesson 4. You will need
+       to undeploy the previous version first.
+
+       Does it deploy? Why not? (Hint: there was a new jar file
+       introduced to the repository)
+
+    5. Fix the new bug, undeploy the bad application and deploy the
+       corrected one.

source/java/org/gibiris/javaBootcampNoEclipse/AstroFun.java

@@ -0,0 +1,94 @@
+
+import com.mhuss.AstroLib.*;
+import com.mhuss.Util.*;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+import java.util.TimeZone;
+import java.util.Date;
+
+
+public class AstroFun {
+
+    private double lat, lon;
+    private ObsInfo whereAmI;
+    private AstroDate myAD;
+    private PlanetData sunData, moonData;
+
+    public AstroFun() {
+
+        // Grand Island, Nebraska, U.S.A.
+        this.lat = 40.9162;
+        this.lon = -98.2962;
+        this.whereAmI = new ObsInfo (new Latitude(lat), new Longitude(lon));
+
+        // 2017-08-21 13:00 CDT
+        this.myAD = new AstroDate ( 21, 8, 2017, 21, 14, 0 );
+
+        this.sunData = new PlanetData (Planets.SUN, myAD.jd(), whereAmI);
+
+        this.moonData = new PlanetData (Planets.LUNA, myAD.jd(), whereAmI);
+    }
+
+    public double getSunD() {
+        double tmp;
+        try {
+            tmp = this.sunData.getDeclination();
+        }
+        catch ( NoInitException nieOops ) {
+            tmp = 0;
+        }
+        return tmp;
+    }
+
+    public double getSunRA() {
+        double tmp;
+        try {
+            tmp = this.sunData.getRightAscension();
+        }
+        catch ( NoInitException nieOops ) {
+            tmp = 0;
+        }
+        return tmp;
+    }
+
+    public double getMoonD() {
+        double tmp;
+        try {
+            tmp = this.moonData.getDeclination();
+        }
+        catch ( NoInitException nieOops ) {
+            tmp = 0;
+        }
+        return tmp;
+    }
+
+    public double getMoonRA() {
+        double tmp;
+        try {
+            tmp = this.moonData.getRightAscension();
+        }
+        catch ( NoInitException nieOops ) {
+            tmp = 0;
+        }
+        return tmp;
+    }
+
+    public static void main(String[] args) {
+        // System.out.println("Hello World!");
+
+        AstroFun hmm = new AstroFun();
+
+        System.out.print ("Sun:  ");
+        System.out.println
+            ( "Declination: " + Math.toDegrees(hmm.getSunD()) +
+              ", Right Ascension: " + Math.toDegrees(hmm.getSunRA())
+              );
+        System.out.print ("Moon: ");
+        System.out.println
+            ( "Declination: " + Math.toDegrees(hmm.getMoonD()) +
+              ", Right Ascension: " + Math.toDegrees(hmm.getMoonRA())
+              );
+
+    }
+
+}

source/java/org/gibiris/javaBootcampNoEclipse/MyHelloWorldServlet.java

@@ -9,6 +9,18 @@ public class MyHelloWorldServlet extends HttpServlet {
     public void doGet(HttpServletRequest request, HttpServletResponse response)
     throws IOException, ServletException
     {
+
+        double sunD = 0, sunRA = 0, moonD = 0, moonRA = 0;
+
+        String oopsMsg = new String ("No exception");
+
+        AstroFun myAstroInfo = new AstroFun();
+
+        sunD = Math.toDegrees(myAstroInfo.getSunD());
+        sunRA = Math.toDegrees(myAstroInfo.getSunRA());
+        moonD = Math.toDegrees(myAstroInfo.getMoonD());
+        moonRA = Math.toDegrees(myAstroInfo.getMoonRA());
+
         response.setContentType("text/html");
         PrintWriter out = response.getWriter();
         out.println("<html>");
@@ -18,6 +30,19 @@ public class MyHelloWorldServlet extends HttpServlet {
         out.println("<body>");
         out.println("<h1 align=\"center\">Éibhear's Hello World (Servlet) example</h1>");
         out.println("<p>Ho there!</p>");
+        if ( oopsMsg.equals("No exception") ) {
+            out.println("<p>Position in the sky of the Sun and the Moon as seen from Grand " +
+                        "Island in Nebraska on Monday the 21<sup>st</sup> of August at 21:14 " +
+                        "UTC.</p>");
+            out.println("<table>");
+            out.println("<tr><th>Body</th><th>Declination (degrees N of equator)</th><th>Right Ascension (degrees E of the Vernal Equinox)</th></tr>");
+            out.println("<tr><th>Sun</th><td>" + sunD + "</td><td>" + sunRA + "</td></tr>");
+            out.println("<tr><th>Moon</th><td>" + moonD + "</td><td>" + moonRA + "</td></tr>");
+            out.println("</table>");
+        }
+        else {
+            out.println("<p>We regret to say that we can't bring you the information you're looking for at the moment. Please come back later (because, y'know, your visit is important to us, 'n' all!).</p>");
+        }
         out.println("</body>");
         out.println("</html>");
     }