Unable to locate repository from command line Java application

[gordonc]

I have written a Java application that reads a filesystem based modeshape repository.

The application locates the repository configuration file (UsageAnalyzer.json) in the same folder as the application. The config file contains:

{

   "name" : "UsageAnalyzer",

   "workspaces" : {

      "predefined" : ["usageWorkspace"],

      "default" : "default",

      "allowCreation" : true

   },

   "security" : {

      "anonymous" : {

         "roles" : ["readonly", "readwrite", "admin"],

         "useOnFailedLogin" : false

      }

   },

   "storage": {

      "persistence" : {

         "type" : "file",

         "path": "UsageAnalyzer"

      }

   }

}

When running in Eclipse:

- I have copied the config file into the target folder

- this is the working directory for the code executing from the JAR file in that folder, and the code finds the config based on the working directory

- I created the UsageAnalyzer folder, containing the modeshape.repository file, in the project root folder (ie "C:\projects\TreeViewer\UsageAnalyzer")

- the application locates the config file properly and opens/reads the repository file properly

Next I go to the command line in Windows:

- copy the JAR file from the target folder (along with the config file) to a new temp folder

- copy the UsageAnalyzer folder into the new folder

- execute the following: java -cp .;TreeViewer-0.0.1-SNAPSHOT-jar-with-dependencies.jar com.avaloncs.treeview.TreeViewer

I get the following error:

javax.jcr.RepositoryException: Error while starting 'UsageAnalyzer' repository: None of the existing persistence providers could return a Schematic DB with type 'file'

        at org.modeshape.jcr.JcrRepository.login(JcrRepository.java:635)

        at org.modeshape.jcr.JcrRepository.login(JcrRepository.java:594)

        at org.modeshape.jcr.JcrRepository.login(JcrRepository.java:136)

        at com.avaloncs.treeview.TreeViewer.getJcrRepositorySession(TreeViewer.java:216)

        at com.avaloncs.treeview.TreeViewer.initialize(TreeViewer.java:81)

        at com.avaloncs.treeview.TreeViewer.main(TreeViewer.java:334)

Caused by: java.lang.RuntimeException: None of the existing persistence providers could return a Schematic DB with type 'file'

        at org.modeshape.schematic.Schematic.lambda$getDb$10(Schematic.java:81)

        at java.util.Optional.orElseThrow(Unknown Source)

        at org.modeshape.schematic.Schematic.getDb(Schematic.java:77)

        at org.modeshape.jcr.Environment.getDb(Environment.java:59)

        at org.modeshape.jcr.JcrRepository$RunningState.<init>(JcrRepository.java:1035)

        at org.modeshape.jcr.JcrRepository$RunningState.<init>(JcrRepository.java:937)

        at org.modeshape.jcr.JcrRepository.doStart(JcrRepository.java:368)

        at org.modeshape.jcr.JcrRepository.login(JcrRepository.java:633)

        ... 5 more

I have tried for many days to determine what is causing the error. I have even done remote debugging of the application, using the modeshape source.

But I have not been able to figure this out.

Does anyone have any suggestions that I can try?

My requirement is that this application must be able to run from command line, with external configuration file and external modeshape repository file.

[hchiorean]

Provided you've included the contents of the modeshape-persistence-file.jar in your -jar-with-dependencies, the problem lies in the fact that ModeShape uses Java's Service Loader approach to load persistence providers: modeshape/Schematic.java at master · ModeShape/modeshape · GitHub I suspect this does not "play well" with the "fat jar" approach that you're using.

So I would investigate this some more (how to get java's Service Loader mechanism to work inside a fat jar). The first thing you would probably want to make sure is that the META-INF/services section of your jar contains the file required by the file persistence provider (see https://github.com/ModeShape/modeshape/tree/master/persistence/modeshape-persistence-file/src/main/resources/META-INF/services)

[gordonc]

The modeshape-persistence-file.jar file is included in the "fat jar". I'm looking into your suggestion regarding the META-INF/services section of the jar.

[gordonc]

Brilliant. That did the trick.

I added META-INF/services/org.modeshape.schematic.SchematicDbProvider file, and put the following line into that file:

org.modeshape.persistence.file.FileDbProvider

I ended up with two instances of that file in the "fat jar". When I deleted the one I didn't create, the application worked.

Many thanks.