Jira Datacenter 9.X 405 Error

Hi, getting 405 error in Jira 9.X Datacenter version. But the app works fine on 8.X. Is there any migration in pom needs to be done?

<?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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.accelq.plugins.jira</groupId>
    <artifactId>aq-jira-plugin</artifactId>
    <version>1.4.3.6-SNAPSHOT</version>
    <organization>
        <name>ACCELQ</name>
        <url>http://www.accelQ.com/</url>
    </organization>
    <name>aq-jira-plugin</name>
    <description>This plugin integrates ACCELQ into JIRA.</description>
    <packaging>atlassian-plugin</packaging>
    <dependencies>
        <dependency>
            <groupId>com.atlassian.jira</groupId>
            <artifactId>jira-api</artifactId>
            <version>${jira.version}</version>
            <scope>provided</scope>
        </dependency>
        <!-- Add dependency on jira-core if you want access to JIRA implementation classes as well as the sanctioned API. -->
        <!-- This is not normally recommended, but may be required eg when migrating a plugin originally developed against JIRA 4.x -->

        <dependency>
            <groupId>com.atlassian.jira</groupId>
            <artifactId>jira-core</artifactId>
            <version>${jira.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.plugin</groupId>
            <artifactId>atlassian-spring-scanner-annotation</artifactId>
            <version>${atlassian.spring.scanner.version}</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.plugin</groupId>
            <artifactId>atlassian-spring-scanner-runtime</artifactId>
            <version>${atlassian.spring.scanner.version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
            <scope>provided</scope>
        </dependency>
        <!-- WIRED TEST RUNNER DEPENDENCIES -->
        <dependency>
            <groupId>com.atlassian.plugins</groupId>
            <artifactId>atlassian-plugins-osgi-testrunner</artifactId>
            <version>${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>2.8.9</version>
        </dependency>
        <!-- Uncomment to use TestKit in your project. Details at https://bitbucket.org/atlassian/jira-testkit -->
        <!-- You can read more about TestKit at https://developer.atlassian.com/display/JIRADEV/Plugin+Tutorial+-+Smarter+integration+testing+with+TestKit -->
        <!--
        <dependency>
            <groupId>com.atlassian.jira.tests</groupId>
            <artifactId>jira-testkit-client</artifactId>
            <version>${testkit.version}</version>
            <scope>test</scope>
        </dependency>
        -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.4</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.6</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.13</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>1.8.5</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.templaterenderer</groupId>
            <artifactId>atlassian-template-renderer-api</artifactId>
            <version>2.0.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.ocpsoft.prettytime</groupId>
            <artifactId>prettytime</artifactId>
            <version>4.0.1.Final</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>com.atlassian.maven.plugins</groupId>
                <artifactId>jira-maven-plugin</artifactId>
                <version>${amps.version}</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>${testkit.version}</version>
                        </pluginArtifact>
                    </pluginArtifacts>
                    -->
                    <enableQuickReload>true</enableQuickReload>
                    <enableFastdev>false</enableFastdev>
                    <!-- See here for an explanation of default instructions: -->
                    <!-- https://developer.atlassian.com/docs/advanced-topics/configuration-of-instructions-in-atlassian-plugins -->
                    <instructions>
                        <Atlassian-Plugin-Key>${atlassian.plugin.key}</Atlassian-Plugin-Key>
                        <!-- Add package to export here -->
                        <Export-Package>com.accelq.plugins.jira.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>
                    </instructions>
                </configuration>
            </plugin>
            <plugin>
                <groupId>com.atlassian.plugin</groupId>
                <artifactId>atlassian-spring-scanner-maven-plugin</artifactId>
                <version>${atlassian.spring.scanner.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>atlassian-spring-scanner</goal>
                        </goals>
                        <phase>process-classes</phase>
                    </execution>
                </executions>
                <configuration>
                    <scannedDependencies>
                        <dependency>
                            <groupId>com.atlassian.plugin</groupId>
                            <artifactId>atlassian-spring-scanner-external-jar</artifactId>
                        </dependency>
                    </scannedDependencies>
                    <verbose>false</verbose>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <properties>
        <jira.version>8.14.1</jira.version>
        <amps.version>8.2.2</amps.version>
        <plugin.testrunner.version>2.0.1</plugin.testrunner.version>
        <atlassian.spring.scanner.version>1.2.13</atlassian.spring.scanner.version>
        <!-- This key is used to keep the consistency between the key in atlassian-plugin.xml and the key to generate bundle. -->
        <atlassian.plugin.key>${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>
</project>

Hello @aq.dev ,
I suppose these are new security rules for actions:
https://confluence.atlassian.com/jiracore/preparing-for-jira-9-0-1115661092.html#Verification%20of%20Jira%20web%20action%20request%20methods

You need to explicitly add @SupportedMethods with necessary methods to actions to work properly.