Error in ServiceProviderExtensionFinder

[jchappelle]

I'm now experimenting with packaging my application as a zip file and deploying into the plugins folder. When I first did it I noticed my extensions all had two instances. It occurred to me that I needed to remove the META-INF/services files since now I'm using the @extension annotation. When I removed the entire META-INF/services folder I got an exception. So I decided to leave the META-INF/services folder but have it empty. Still the same exception.

I was able to fix it by making my Application class implement PluginManagerFactory and create my plugin manager like so:

    @Override
    public PluginManager createPluginManager(File pluginsDir)
    {
        return new DefaultPluginManager()
        {
            @Override
            protected ExtensionFinder createExtensionFinder()
            {
                return new LegacyExtensionFinder(this);
            }
        };
    }

Here is the exception I got. Am I doing something wrong or is this a bug? Not a huge deal since there is a work around but I did want to make you aware since it may expose a bigger problem.

java.lang.IllegalArgumentException: URI is not hierarchical
     at java.io.File.<init>(Unknown Source)
     at ro.fortsoft.pf4j.ServiceProviderExtensionFinder.readPluginsStorages(ServiceProviderExtensionFinder.java:119)
     at ro.fortsoft.pf4j.AbstractExtensionFinder.readStorages(AbstractExtensionFinder.java:124)
     at ro.fortsoft.pf4j.AbstractExtensionFinder.getEntries(AbstractExtensionFinder.java:131)
     at ro.fortsoft.pf4j.AbstractExtensionFinder.find(AbstractExtensionFinder.java:49)
     at ro.fortsoft.pf4j.DefaultExtensionFinder.find(DefaultExtensionFinder.java:41)
     at ro.fortsoft.pf4j.DefaultPluginManager.getExtensions(DefaultPluginManager.java:555)

Also, when I refreshed the page with a CTRL-F5 I got this exception. Figured this may give you more info into the problem. This was before I implemented the custom PluginManagerFactory.

java.nio.file.FileSystemAlreadyExistsException
     at com.sun.nio.zipfs.ZipFileSystemProvider.newFileSystem(ZipFileSystemProvider.java:113)
     at java.nio.file.FileSystems.newFileSystem(Unknown Source)
     at java.nio.file.FileSystems.newFileSystem(Unknown Source)
     at ro.fortsoft.pf4j.ServiceProviderExtensionFinder.readClasspathStorages(ServiceProviderExtensionFinder.java:70)
     at ro.fortsoft.pf4j.AbstractExtensionFinder.readStorages(AbstractExtensionFinder.java:123)
     at ro.fortsoft.pf4j.AbstractExtensionFinder.getEntries(AbstractExtensionFinder.java:131)
     at ro.fortsoft.pf4j.AbstractExtensionFinder.find(AbstractExtensionFinder.java:49)
     at ro.fortsoft.pf4j.DefaultExtensionFinder.find(DefaultExtensionFinder.java:41)
     at ro.fortsoft.pf4j.DefaultPluginManager.getExtensions(DefaultPluginManager.java:555)

I'm using the wicket-plugin version 0.5.0.

Thanks!

[decebals]

I was able to fix it by making my Application class implement PluginManagerFactory and create my plugin manager like so:

It's correct. See also pf4j/pf4j#90 (comment)

java.lang.IllegalArgumentException: URI is not hierarchical
at java.io.File.(Unknown Source)
at ro.fortsoft.pf4j.ServiceProviderExtensionFinder.readPluginsStorages(ServiceProviderExtensionFinder.java:119)

Something is wrong here because you removed ServiceProviderExtensionFinder overwridded DefaultPluginManager.createExtensionFinder

I the next release I think that I will disabled by default the interoperability with ServiceLoader and if you want this interoperability you must activate it via enableServiceLoader (a possible name) method.

[jchappelle]

No you misunderstand. Those errors only happen when I DO NOT use my custom PluginManagerFactory.