Added src code

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+    <project xmlns="http://maven.apache.org/POM/4.0.0"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+        <modelVersion>4.0.0</modelVersion>
+
+        <groupId>com.quicksilver.healthTracker</groupId>
+        <artifactId>Health-Tracker</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <packaging>war</packaging>
+
+        <name>HealthTracker</name>
+
+        <parent>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-parent</artifactId>
+            <version>2.1.7.RELEASE</version>
+            <relativePath/>
+        </parent>
+
+        <properties>
+            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+            <java.version>1.8</java.version>
+        </properties>
+
+        <dependencies>
+            <dependency>
+                <groupId>javax.servlet</groupId>
+                <artifactId>jstl</artifactId>
+            </dependency>
+
+            <dependency>
+                <groupId>org.webjars</groupId>
+                <artifactId>bootstrap</artifactId>
+                <version>3.3.6</version>
+            </dependency>
+
+            <dependency>
+                <groupId>org.webjars</groupId>
+                <artifactId>bootstrap-datepicker</artifactId>
+                <version>1.0.1</version>
+            </dependency>
+
+            <dependency>
+                <groupId>org.webjars</groupId>
+                <artifactId>jquery</artifactId>
+                <version>1.9.1</version>
+            </dependency>
+
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-tomcat</artifactId>
+                <scope>provided</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.apache.tomcat.embed</groupId>
+                <artifactId>tomcat-embed-jasper</artifactId>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-data-jpa</artifactId>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-security</artifactId>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-web</artifactId>
+            </dependency>
+
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-devtools</artifactId>
+                <scope>runtime</scope>
+            </dependency>
+            <dependency>
+                <groupId>com.h2database</groupId>
+                <artifactId>h2</artifactId>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-test</artifactId>
+                <scope>test</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.security</groupId>
+                <artifactId>spring-security-test</artifactId>
+                <scope>test</scope>
+            </dependency>
+        </dependencies>
+
+        <build>
+            <plugins>
+                <plugin>
+                    <groupId>org.springframework.boot</groupId>
+                    <artifactId>spring-boot-maven-plugin</artifactId>
+                </plugin>
+            </plugins>
+        </build>
+
+
+    </project>

src/main/java/com/quicksilver/healthTracker/Application.java

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+package com.quicksilver.healthTracker;
+
+import com.quicksilver.healthTracker.model.Patient;
+import com.quicksilver.healthTracker.repository.PatientRepository;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+
+@SpringBootApplication
+@EnableAutoConfiguration
+@ComponentScan(basePackages={"com.quicksilver.healthTracker"})
+@EnableJpaRepositories(basePackages="com.quicksilver.healthTracker.repository")
+public class Application extends SpringBootServletInitializer {
+    @Autowired
+    private PatientRepository repository;
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+    @Bean
+    InitializingBean seedData() {
+        return () -> {
+            repository.save(new Patient("Sheldon", "Cooper", "[email protected]", "Fever", 8L));
+            repository.save(new Patient("Amy","Fowler","[email protected]", "Headache", 3L));
+            repository.save(new Patient("Meg","March","[email protected]","Cold", 5L));
+
+        };
+    }
+}

src/main/java/com/quicksilver/healthTracker/controller/ErrorController.java

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+package com.quicksilver.healthTracker.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+
+@Controller("error")
+public class ErrorController {
+
+	@ExceptionHandler(Exception.class)
+	public ModelAndView handleException
+		(HttpServletRequest request, Exception ex){
+		ModelAndView mv = new ModelAndView();
+
+		mv.addObject("exception", ex.getLocalizedMessage());
+		mv.addObject("url", request.getRequestURL());
+
+		mv.setViewName("error");
+		return mv;
+	}
+
+}

src/main/java/com/quicksilver/healthTracker/controller/LogoutController.java

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+package com.quicksilver.healthTracker.controller;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@Controller
+public class LogoutController {
+
+	@RequestMapping(value = "/logout", method = RequestMethod.GET)
+	public String logout(HttpServletRequest request,
+			HttpServletResponse response) {
+
+		Authentication authentication = SecurityContextHolder.getContext()
+				.getAuthentication();
+
+		if (authentication != null) {
+			new SecurityContextLogoutHandler().logout(request, response,
+					authentication);
+		}
+
+		return "redirect:/";
+	}
+}

src/main/java/com/quicksilver/healthTracker/controller/PatientController.java

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+package com.quicksilver.healthTracker.controller;
+
+import com.quicksilver.healthTracker.model.Patient;
+import com.quicksilver.healthTracker.service.PatientService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.*;
+
+import javax.validation.Valid;
+
+@Controller
+public class PatientController {
+
+    private PatientService service;
+
+    @Autowired
+    public PatientController(PatientService service) {
+        this.service = service;
+    }
+
+    @GetMapping("/list-patients")
+    public String showAllPatients(Model model) {
+        model.addAttribute("patients", service.findAll());
+        return "patients";
+    }
+
+    @GetMapping("/new-patient")
+    public String showPatientCreationForm(Model model) {
+        model.addAttribute("patient", new Patient());
+        return "new-patient";
+    }
+
+    @PostMapping(value = "/add", consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
+    public String addNewPatient(@Valid @ModelAttribute Patient patient, BindingResult result, Model model) {
+        if (result.hasErrors()) {
+            return "new-patient";
+        }
+        service.save(patient);
+        return "redirect:/list-patients";
+    }
+
+    @GetMapping("/{id}")
+    public String showPatientById(@PathVariable Long id, Model model) {
+        Patient patient = service.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("Invalid patient Id:" + id));
+        model.addAttribute("patient", patient);
+        return "edit-patient";
+    }
+
+    @PostMapping("/{id}/update")
+    public String updatePatient(@PathVariable Long id, @Valid @ModelAttribute Patient patient, BindingResult result, Model model) {
+        if (result.hasErrors()) {
+            return "edit-patient";
+        }
+        service.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("Invalid patient Id:" + id));
+        service.save(patient);
+        return "redirect:/list-patients";
+    }
+
+    @PostMapping("/{id}/delete")
+    public String deletePatient(@PathVariable Long id, Model model) {
+        service.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("Invalid patient Id:" + id));
+        service.deleteById(id);
+        return "redirect:/list-patients";
+    }
+    @GetMapping("/{id}/bar")
+    public String showBar(@PathVariable Long id, Model model) {
+        Patient patient = service.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("Invalid patient Id:" + id));
+        //todo conver it to json/gson
+        model.addAttribute("patient", patient);
+        return "bar";
+    }
+
+}

src/main/java/com/quicksilver/healthTracker/controller/WelcomeController.java

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+package com.quicksilver.healthTracker.controller;
+
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.ModelMap;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+@Controller
+public class WelcomeController {
+
+	@RequestMapping(value = "/", method = RequestMethod.GET)
+	public String showWelcomePage(ModelMap model) {
+		model.put("name", getLoggedinUserName());
+		return "welcome";
+	}
+
+	private String getLoggedinUserName() {
+		Object principal = SecurityContextHolder.getContext()
+				.getAuthentication().getPrincipal();
+
+		if (principal instanceof UserDetails) {
+			return ((UserDetails) principal).getUsername();
+		}
+
+		return principal.toString();
+	}
+
+}

src/main/java/com/quicksilver/healthTracker/model/Disease.java

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+package com.quicksilver.healthTracker.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.validation.constraints.NotBlank;
+
+@Entity
+public class Disease {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+
+    @NotBlank(message = "Disease is mandatory")
+    private String disease;
+
+    public Disease() {}
+
+    public Disease(String disease) {
+        this.disease = disease;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getDisease() {
+        return disease;
+    }
+
+    public void setDisease(String disease) {
+        this.disease = disease;
+    }
+
+    @Override
+    public String toString() {
+        return "disease: {" +
+                "id=" + id +
+                ", disease='" + disease + '\'' +
+                '}';
+    }
+}