How to convert or integrate my java web based application in Jira plugin?

Question

I am working on one Java Spring web based application with Angular 2 in front-end, I want to integrate it with Jira plugin for front-end Angular it is successfully integrated using "atlassian-scanner". And I can see my login page inside Jira but for login and other request it is not working as back-end in not working properly.

My "webpack-manifest.xml" looks like as below :

<bundles>
<web-resource key="client-resources" name="Client Resources">
    <resource name="3rdpartylicenses.txt" type="download" location="client/3rdpartylicenses.txt" />
    <resource name="layers.png" type="download" location="client/layers.png" />
    <resource name="layers-2x.png" type="download" location="client/layers-2x.png" />
            <context>atl.general</context>
</web-resource>
</bundles>

and for Integrating my application I have added below configuration in "atlassian-plugin.xml":

<?xml version="1.0" encoding="UTF-8"?>

<atlassian-plugin key="${atlassian.plugin.key}" name="${project.name}" plugins-version="2"> 
  <plugin-info> 
    <description>${project.description}</description>  
    <version>${project.version}</version>  
    <vendor name="${project.organization.name}" url="${project.organization.url}"/>  
    <param name="plugin-icon">images/pluginIcon.png</param>  
    <param name="plugin-logo">images/pluginLogo.png</param> 
  </plugin-info>  
  <!-- add our i18n resource -->  
  <resource type="i18n" name="i18n" location="ngdemo"/>
  <resource type="download" name="assets/" location="client/assets/"/>
<servlet-context-param key="camelconfig">
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:camel-config.xml</param-value>
  </servlet-context-param>

  <servlet-context-listener name="Hello World Listener" key="helloWorld" class="org.springframework.web.context.ContextLoaderListener">
  </servlet-context-listener>

  <servlet name="CamelServlet" i18n-name-key="camel-servlet.name" key="camel-servlet" class="org.apache.camel.component.servlet.CamelHttpTransportServlet">
    <load-on-startup>1</load-on-startup>
    <url-pattern>/rest/*</url-pattern>
  </servlet>

  <servlet-filter name="CustomFilter" key="customFilter" class="com.filter.CustomFilter" location="before-dispatch" weight="200">
  <url-pattern>/demo/*</url-pattern>
</servlet-filter>
  <resource auth="Container" driverClassName="org.postgresql.Driver" maxTotal="30" maxIdle="10" maxWaitMillis="10000" minIdle="5" name="jdbc/DBname" username="postgres" password="ROOT" url="jdbc:postgresql://localhost:5432/postgres" type="javax.sql.DataSource" />

</atlassian-plugin> 

pom.xml:

<dependencies>
        <dependency>
            <groupId>com.atlassian.templaterenderer</groupId>
            <artifactId>atlassian-template-renderer-api</artifactId>
            <version>4.0.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.jira</groupId>
            <artifactId>jira-api</artifactId>
            <version>${jira.version}</version>
            <scope>provided</scope>
            <exclusions>
                <exclusion>
                    <groupId>jta</groupId>
                    <artifactId>jta</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.plugin</groupId>
            <artifactId>atlassian-spring-scanner-annotation</artifactId>
            <version>${atlassian.spring.scanner.version}</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.plugin</groupId>
            <artifactId>atlassian-spring-scanner-runtime</artifactId>
            <version>${atlassian.spring.scanner.version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
            <scope>provided</scope>
        </dependency>
         <dependency>
            <groupId>com.atlassian.plugins</groupId>
            <artifactId>atlassian-plugins-osgi-testrunner</artifactId>
            <version>${plugin.testrunner.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>jsr311-api</artifactId>
            <version>1.1.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.2.2-atlassian-1</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.4</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.6</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.1.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>1.8.5</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring</artifactId>
            <version>2.5.6</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.2.5.RELEASE</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.2.5.RELEASE</version>
            <scope>provided</scope>
        </dependency>
        </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>com.atlassian.maven.plugins</groupId>
                <artifactId>jira-maven-plugin</artifactId>
                <version>8.0.2</version>
                <extensions>true</extensions>
                <configuration>
                    <compressResources>false</compressResources>
                    <productVersion>${jira.version}</productVersion>
                    <productDataVersion>${jira.version}</productDataVersion>
                    <!-- Uncomment to install TestKit backdoor in JIRA. -->
                    <!--
                    <pluginArtifacts>
                        <pluginArtifact>
                            <groupId>com.atlassian.jira.tests</groupId>
                            <artifactId>jira-testkit-plugin</artifactId>
                            <version>${testkit.version}</version>
                        </pluginArtifact>
                    </pluginArtifacts>
                    -->
                    <enableQuickReload>true</enableQuickReload>
                    <!-- See here for an explanation of default instructions: -->
                    <!-- https://developer.atlassian.com/docs/advanced-topics/configuration-of-instructions-in-atlassian-plugins -->
                    <instructions>
                        <Atlassian-Plugin-Key>${atlassian.plugin.key}</Atlassian-Plugin-Key>
                        <!-- Add package to export here -->
                        <Export-Package>com.demo.api,</Export-Package>
                        <!-- Add package import here -->
                        <Import-Package>org.springframework.osgi.*;resolution:="optional", org.eclipse.gemini.blueprint.*;resolution:="optional", *</Import-Package>
                        <!-- Ensure plugin is spring powered -->
                        <Spring-Context>*</Spring-Context>
                        <Atlassian-Scan-Folders>META-INF/plugin-descriptor</Atlassian-Scan-Folders>
                    </instructions>
                </configuration>
            </plugin>
            <plugin>
                <groupId>com.atlassian.plugin</groupId>
                <artifactId>atlassian-spring-scanner-maven-plugin</artifactId>
                <version>${atlassian.spring.scanner.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>atlassian-spring-scanner</goal>
                        </goals>
                        <phase>process-classes</phase>
                    </execution>
                </executions>
                <configuration>
                    <scannedDependencies>
                        <dependency>
                            <groupId>com.atlassian.plugin</groupId>
                            <artifactId>atlassian-spring-scanner-external-jar</artifactId>
                        </dependency>
                    </scannedDependencies>
                    <verbose>false</verbose>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <properties>
        <jira.version>7.13.0</jira.version>
        <amps.version>8.0.2</amps.version>
        <plugin.testrunner.version>2.0.1</plugin.testrunner.version>
        <atlassian.spring.scanner.version>1.2.13</atlassian.spring.scanner.version>
        <!-- This property ensures consistency between the key in atlassian-plugin.xml and the OSGi bundle's key. -->
        <atlassian.plugin.key>${project.groupId}.${project.artifactId}</atlassian.plugin.key>
        <!-- TestKit version 6.x for JIRA 6.x -->
        <testkit.version>6.3.11</testkit.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

And I have added all external jars inside "Project Structure" -> "Libraries" in Intellij but it seems like this is not working properly.

Do anyone have idea how to properly integrate our application inside Jira or have any proper documentation step by step? Your help will be really grateful. Thank you in advance.