Jersey JAX-RS application returns 404 - jersey

Question

Everytime I run the application on server and enter the url I don't get any response. It says the following (image):
Java code is as follows:
package application;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.ws.rs.GET;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.Path;
import javax.ws.rs.core.Application;
import javax.ws.rs.ApplicationPath;
#Path("demo")
public class FRITZ {
#GET
#Produces(MediaType.TEXT_PLAIN)
public String calculateCellComplexities(String spreadsheetPath) throws Exception {
System.out.print("Entered Cell Complexity......\n");
//open spreadsheet
Spreadsheet spreadsheet;
try {
spreadsheet = POIReader.readFromFile(spreadsheetPath);
} catch (Exception e) {
e.printStackTrace();
return null;
}
//analyze metrics
AnalyzeEngine analyzer = new AnalyzeEngine();
boolean success;
try {
success = analyzer.initializeEvaluationMode(EvaluationMode.SMELLS_COMPLETE);
analyzer.analyze(spreadsheet);
} catch (Exception e) {
e.printStackTrace();
return null;
}
if(!success) {
System.err.println("Could not analyze spreadsheet: abort!");
return null;
}
//prepare metrics for analysis
List<Metric> analysisMetrics = new ArrayList<Metric>();
analysisMetrics.add(MetricFactory.getMetric(LongCalculationChainSmell.class));
analysisMetrics.add(MetricFactory.getMetric(PatternFinderColumnNoBorder.class));
analysisMetrics.add(MetricFactory.getMetric(PatternFinderRowNoBorder.class));
analysisMetrics.add(MetricFactory.getMetric(MultipleReferences.class));
analysisMetrics.add(MetricFactory.getMetric(MultipleOperations.class));
//initialize max metric value data
Double[] maxValues = new Double[analysisMetrics.size()];
for(int i = 0; i < maxValues.length; i++) {
maxValues[i] = 0.0d;
}
//determine max metric values in spreadsheet
for(Worksheet worksheet : spreadsheet.getWorksheets()) {
for(Cell cell : worksheet.getCells()) {
for(int index = 0; index < analysisMetrics.size(); index++) {
Metric metric = analysisMetrics.get(index);
if(metric.domain == Domain.INTEGER) {
Integer metricValue = (Integer) metric.getMetricValueForCell(cell);
if(metricValue != null)
{
maxValues[index] = Math.max(maxValues[index], metricValue);
}
} if(metric.domain == Domain.LONG) {
Long metricValue = (Long) metric.getMetricValueForCell(cell);
if(metricValue != null)
{
maxValues[index] = Math.max(maxValues[index], metricValue);
}
} if (metric.domain == Domain.REAL) {
Double metricValue = (Double) metric.getMetricValueForCell(cell);
if(metricValue != null)
maxValues[index] = Math.max(maxValues[index], metricValue);
}
}
}
}
// for(int index = 0; index < analysisMetrics.size(); index++) {
// Metric metric = analysisMetrics.get(index);
// if(metric.domain == Domain.INTEGER || metric.domain == Domain.REAL) {
// System.out.println(index + ": " + maxValues[index]);
// }
// }
//calculate complexity estimate
Map<String,Double> probabilityMap = new HashMap<String, Double>();
for(Worksheet worksheet : spreadsheet.getWorksheets()) {
for(Cell cell : worksheet.getCells()) {
double complexity = 0.0d;
if(cell.isFormulaCell()) {
int numAppliedMetrics = 0;
for(int index = 0; index < analysisMetrics.size(); index++) {
Metric metric = analysisMetrics.get(index);
switch(metric.domain) {
case BOOLEAN:
Boolean booleanMetricValue = (Boolean) metric.getMetricValueForCell(cell);
if(booleanMetricValue != null) {
complexity += (booleanMetricValue ? 1.0f : 0.0f);
numAppliedMetrics++;
}
break;
case INTEGER:
Integer metricValue = (Integer) metric.getMetricValueForCell(cell);
if(metricValue != null) {
complexity += metricValue / maxValues[index];
numAppliedMetrics++;
}
break;
case REAL:
Double doubleMetricValue = (Double) metric.getMetricValueForCell(cell);
if(doubleMetricValue != null) {
complexity += doubleMetricValue / maxValues[index];
numAppliedMetrics++;
}
break;
case STRING:
default:
break;
}
}
if(numAppliedMetrics > 0)
complexity /= numAppliedMetrics;
}
probabilityMap.put(cell.getPosition().toA1DebugString(), complexity);
}
}
//return probabilityMap;
String a = "hello from server";
return a;
}
}
Please ignore main logic of function, I am just testing web api with simple returned string, once it runs successuflly I will return the json.
Following is my web.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>FRITZ-WEBAPI</display-name>
<servlet>
<servlet-name>FRITZ JAVA API</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer.class</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>application</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>FRITZ JAVA API</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>