As described here by Pentaho, most of the new features will be developed within the OSGi environment. Also some existing features such as marketplace have been converted to OSGi bundles. Meanwhile, webSpoon currently cannot use these features provided as OSGi bundles.

I'd like to make these features available to webSpoon.

According to the RAP Deverper's Guide, RAP can be deployed in different setups, including RWT standalone, and RAP with OSGi. The current setup of webSpoon is RWT standalone.

	Spoon	webSpoon (RWT standalone)	webSpoon (RAP with OSGi)
Implemented?	Yes	Yes	Not yet
OSGi-compliant?	No	No	Yes
Plugin registry thru	PDI-OSGI-Bridge	PDI-OSGI-Bridge	?

I am able to launch Apache Karaf by adding PDI-OSGI-Bridge and related dependencies. As a result, the Marketplace plugin can now be used in webSpoon. However, Apache Tomcat won't stop gracefully maybe because of the daemon threads related to Apache Karaf. This known bug is the reason why the development branch (webspoon-6.1_karaf) cannot be merged to the branch webspoon-6.1.

Update [2/12/18]: webSpoon can launch Apache Karaf and use PDI Plugin OSGi bundles.

Some of the plugins are provided as OSGi bundles 1 2, and some of which serve HTTP service 3. As of v0.9.0.21, they are

• Connections Plugin UI (connections-ui)
• PDI File Open and Save New Plugin (file-open-save-new)
• PDI File Open and Save Plugin (file-open-save)
• Get Fields Plugin (get-fields)
• PDI Repositories Plugin (repositories-plugin)
• Pentaho Marketplace (pentaho-marketplace-di)
• Hadoop Cluster Plugin UI (hadoop-cluster-ui)

The HTTP service is served at :9051/osgi (the port may change), which is different from where webSpoon is served: :8080/spoon. Due to the security restriction by RAP/RWT 4, the domain and port of OSGi should be the same as webSpoon. To comply with this restriction, a reverse proxy is being used so that a request :8080/spoon/osgi/* is forwarded to :9051/osgi/*.

Encoded slash (e.g., %2F for / and %5C for \) should be allowed at two places: Tomcat and Spring Security for some of the OSGi plugins work as expected. For example, get-fields uses http://localhost:8080/spoon/osgi/cxf/get-fields/sample/file%3A%2F%2F%2Fhome%2Ftomcat%2F.kettle%2Fdata%2Fsamples%2Ftransformations%2Ffiles%2Fjsonfile.js/json/.