After some research I found out it is a OSGi bundle that runs on top of Apache Felix.
Please check following import available in sample code (CustomGatewayJWTGenerator):
import org.osgi.service.component.annotations.Component;
See also sample pom.xml. It adds some information about OSGi bundle:
Here is the important part:
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>3.2.0</version>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
<Bundle-Name>${project.artifactId}</Bundle-Name>
<Export-Package>
org.wso2.carbon.test.*
</Export-Package>
<Import-Package>
org.wo2.carbon.apimgt.gateway.*,
org.wso2.carbon.apimgt.impl.*
com.nimbusds.jwt.*,
*;resolution:=optional
</Import-Package>
</instructions>
</configuration>
</plugin>
As you can see, it exports components as OSGi. See bellow my pom.xml:
<?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>
<parent>
<groupId>org.wso2</groupId>
<artifactId>wso2</artifactId>
<version>1.2</version>
</parent>
<groupId>org.example</groupId>
<artifactId>CustomGatewayJWTGenerator</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>bundle</packaging>
<dependencies>
<dependency>
<groupId>org.wso2.carbon.apimgt</groupId>
<artifactId>org.wso2.carbon.apimgt.gateway</artifactId>
<version>${carbon.apimgt.version}</version>
</dependency>
<dependency>
<groupId>org.wso2.orbit.com.nimbusds</groupId>
<artifactId>nimbus-jose-jwt</artifactId>
<version>7.3.0.wso2v1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>3.2.0</version>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
<Bundle-Name>${project.artifactId}</Bundle-Name>
<Export-Package>
la.foton.wso2.apim.custom.*
</Export-Package>
<Import-Package>
org.wo2.carbon.apimgt.gateway.*,
org.wso2.carbon.apimgt.impl.*
com.nimbusds.jwt.*,
*;resolution:=optional
</Import-Package>
</instructions>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<carbon.apimgt.version>6.6.163</carbon.apimgt.version>
</properties>
</project>
I believe you just need to change package information in <Export-Package>, copy JAR file to $APIM_HOME/repository/components/dropins and restart server.
Please let me know if something goes wrong. If it works, please mark answer as correct to help others. :)
