[JOHNZON-107] Add 'SPI-Provider' bundle header to johnzon-core

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.0.0
• Assignee: Unassigned
• Reporter: Stefan Seifert
• Created: 10/Mar/17 22:26
• Updated: 13/Mar/17 10:28
• Resolved: 13/Mar/17 10:28

Description

Johnzon 1.0.0 together with org.apache.geronimo.specs:geronimo-json_1.0_spec:1.0-alpha-1 currently does not work within OSGi envrionments - the service loader does not found the implementation class (see GERONIMO-6560).

getting service loaders right in OSGi is a bit tricky. there are solutions to support this e.g.:

• https://github.com/apache/geronimo-specs/tree/trunk/geronimo-osgi-support
• http://aries.apache.org/modules/spi-fly.html

both need an "opt-in" that means provider bundles like johnzon-core have to add special instructions in their manifest to notice the environment it provides some service loader implementations.

since OSGi R5 there is a spec compliant way to do this (covered in the OSGi Enterprise Specification version 5 chapter 133), but this is currently only supported by the aries spyfly implementation, not by the geronimo spec implementation.

thus my proposal is to simply add a header

SPI-Provider: *

to johnzon-core - this is supporty by both aries spyfly as the geronimo spec implementation.

Issue Links

• is superceded by: JOHNZON-108 Add dynamic ServiceLoader support for OSGi environments
• relates to: GERONIMO-6560 JSON spec jar is not able to load provider in an OSGi environment