Use "json-schema-validator" as an OSGi bundle

Hello

This post describes how to integrate json-schema-validator 2.2.5 in an OSGi container.

json-schema-validator home page redirect to the binary download site to get OSGi ready library. But with this last one I was unable to make json-schema-validator working... I got an unsatisfied package jackson-databind.

So I decide to integrate by hand json-schema-validator and related dependencies. 14 jar to get and check (see into the MANIFEST.MF the "Export-Packages" directive..)

Here is the way :

• use json-schema-validator in your Eclipse Java project by adding the pom dependency.
• make a sample unit test working (see example package of the json-schema-validator project).
• open your project "pom.xml" file using eclipse to know the current dependency tree (view called "Dependency Hierarchy").

After getting one-by-one each mandatory dependendency of the json validator, here is the final list I get :

• btf-1.2.jar
• jackson-annotations-2.4.1.jar
• jackson-core-2.4.1.1.jar
• msg-simple-1.1.jar
• jackson-databind-2.4.1.3.jar
• guava-16.0.1.jar
• uri-template-0.9.jar
• jackson-coreutils-1.8.jar
• rhino-1.7R4.jar
• libphonenumber-6.0.jar
• mailapi-1.4.3.jar
• jopt-simple-4.6.jar
• joda-time-2.3.jar
• json-schema-core-1.2.4.jar
• json-schema-validator-2.2.5.jar

You can get each jar from a given maven repository; example joda-time-2.3.jar.

For each jar, I have to check the OSGi Export package directive. Here is the way to do that :

• open the jar file using zip tool (ex. 7zip)
• edit the file "META-INF/MANIFEST.MF"
• check that the file contains an Export package directive like the following example for yoda time :

Export-Package: org.joda.time;version=2.3,org.joda.time.base;version=2
 .3,org.joda.time.chrono;version=2.3,org.joda.time.convert;version=2.3
 ,org.joda.time.field;version=2.3,org.joda.time.format;version=2.3,org
 .joda.time.tz;version=2.3

• If this is not the case, I had to add it by hand. I had to do that for the following library : rhino, libphonenumbers, joptsimple. See under the related export package :
  
  • rhino-1.7R4.jar
  • get an updated version here

  Export-Package: org.mozilla.javascript;version="1.7"
  

  • libphonenumber-6.0.jar
  • EDIT: it's now useless to do this update since this jar is embedded in the bundle's project (cf. under)
  • related issue : code.google.com libphonenumber issue #205

   
  Export-Package: com.google.i18n.phonenumbers;version="6.0"
  

  • joptsimple

    Export-Package: joptsimple;version="4.6"
    

  • EDIT: it's now useless to do this update since issue #65 has been fixed; So you could use a recent version : jopt-simple-4.8-SNAPSHOT.jar

After all these steps, when I want to validate a json content with a schema, I got an error while loading meta-schema "/draftv4/schema" (problem of class loading).
Until now, I have not figured out how to fix it.

java.lang.ExceptionInInitializerError
        at com.github.fge.jsonschema.SchemaVersion.(SchemaVersion.java:65)
        at com.github.fge.jsonschema.SchemaVersion.(SchemaVersion.java:44)
        at com.github.fge.jsonschema.core.load.configuration.LoadingConfigurationBuilder.(LoadingConfigurationBuilder.java:
17)
        at com.github.fge.jsonschema.core.load.configuration.LoadingConfiguration.byDefault(LoadingConfiguration.java:151)
(...)
Caused by: java.io.IOException: resource /draftv4/schema not found
        at com.github.fge.jackson.JsonLoader.fromResource(JsonLoader.java:91)
        at com.github.fge.jsonschema.SchemaVersion.(SchemaVersion.java:63)

This file is present into "json-schema-core-1.2.4.jar" but not loaded as resource by OSGi container...

Following this error, I just open an issue json-schema-validator issue #111.

As workaround, with the help of Gábor Bakos and as first draft, I just push a "OSGi'fyed" version of the "json-schema-validator" here : github.com boly38 json-schema-validator-bundle.

Of course any feedbacks are welcome