Issues with orientdb-2.0-rc1 lucene plugin, embedded in Play Framework

[Bertrand Quenin]

Hi,

I'm having trouble in play framework when trying to use the Lucene plugin. Here is what my Global.scala look like:

import com.orientechnologies.orient.server.OServerMain
import com.tinkerpop.blueprints.impls.orient.OrientGraphFactory
import play.api._

object Global extends GlobalSettings {
  val orientdb = OServerMain.create
  val factory = new OrientGraphFactory("plocal:databases/graphdb", "admin", "admin")

  override def onStart(app: Application) {
    orientdb.startup(getClass.getClassLoader.getResourceAsStream("orientdb-config.xml"))
    orientdb.activate

    factory.setAutoStartTx(false)

    Logger.info("Application has started")
  }

  override def onStop(app: Application) {
    orientdb.shutdown

    Logger.info("Application shutdown...")
  }
}

And here is the result:

->java.lang.NoClassDefFoundError: com/orientechnologies/orient/server/plugin/OServerPluginAbstract
     java.lang.ClassLoader.defineClass1(Native Method)
     java.lang.ClassLoader.defineClass(ClassLoader.java:760)
     java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
     java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
     java.net.URLClassLoader.access$100(URLClassLoader.java:73)
     java.net.URLClassLoader$1.run(URLClassLoader.java:367)
     java.net.URLClassLoader$1.run(URLClassLoader.java:361)
     java.security.AccessController.doPrivileged(Native Method)
     java.net.URLClassLoader.findClass(URLClassLoader.java:360)
     java.lang.ClassLoader.loadClass(ClassLoader.java:424)
     java.lang.ClassLoader.loadClass(ClassLoader.java:357)
     java.lang.Class.forName0(Native Method)
     java.lang.Class.forName(Class.java:344)
     com.orientechnologies.orient.server.plugin.OServerPluginManager.startPluginClass(OServerPluginManager.java:254)
     com.orientechnologies.orient.server.plugin.OServerPluginManager.installDynamicPlugin(OServerPluginManager.java:343)
     com.orientechnologies.orient.server.plugin.OServerPluginManager.updatePlugin(OServerPluginManager.java:194)
     com.orientechnologies.orient.server.plugin.OServerPluginManager.updatePlugins(OServerPluginManager.java:283)
     com.orientechnologies.orient.server.plugin.OServerPluginManager.startup(OServerPluginManager.java:85)
     com.orientechnologies.orient.server.OServer.registerPlugins(OServer.java:820)
     com.orientechnologies.orient.server.OServer.activate(OServer.java:256)
     Global$.onStart(Global.scala:11)
     play.api.GlobalPlugin.onStart(GlobalSettings.scala:220)
     play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:91)
     play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:91)
     scala.collection.immutable.List.foreach(List.scala:383)
     play.api.Play$$anonfun$start$1.apply$mcV$sp(Play.scala:91)
     play.api.Play$$anonfun$start$1.apply(Play.scala:91)
     play.api.Play$$anonfun$start$1.apply(Play.scala:91)
     play.utils.Threads$.withContextClassLoader(Threads.scala:21)
     play.api.Play$.start(Play.scala:90)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:157)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:130)
     scala.Option.map(Option.scala:145)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:130)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:128)
     scala.util.Success.flatMap(Try.scala:230)
     play.core.ReloadableApplication$$anonfun$get$1.apply(ApplicationProvider.scala:128)
     play.core.ReloadableApplication$$anonfun$get$1.apply(ApplicationProvider.scala:120)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
     scala.concurrent.forkjoin.ForkJoinTask$AdaptedRunnableAction.exec(ForkJoinTask.java:1361)
     scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
     scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
     scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
     scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

I'm not sure how to resolve this. It seems that there is some classloader magic failing here, but I'm puzzled on how to solve it.

Thanks,
BQ.

[Enrico Risa]

Can you post your build.sbt?

where is located the plugin?

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[Bertrand Quenin]

Sure. Here is my build.sbt:

name := """project"""

version := "1.0.0"

lazy val root = (project in file(".")).enablePlugins(PlayScala)

scalaVersion := "2.11.1"

libraryDependencies ++= Seq(
  //
  // Webjars
  "org.webjars" %% "webjars-play" % "2.3.0-2",
  "org.webjars" % "jquery" % "2.1.1",
  "org.webjars" % "bootswatch-lumen" % "3.2.0",
  "org.webjars" % "emberjs" % "1.9.0",
  "org.webjars" % "emberjs-data" % "1.0.1-beta.11",
  "org.webjars" % "handlebars" % "2.0.0-1",
  //
  // OrientDB
  "com.orientechnologies" % "orientdb-graphdb" % "2.0-rc1"
)

The plugin is located in the "plugins" subfolder which is itself located in the root of the project.

project/build.sbt
project/plugins/orientdb-lucene-2.0-rc1-dist.jar

[Bertrand Quenin]

I've fixed my problem by using the plugin as "embedded" (i.e. adding the dependency explicitely in the build.sbt) and not using the dynamic plugin.

Regards,
BQ.

[Mo LOUKILI]

This is due to the plugin classloader since its parent class loader is the main Thread classloader.

I would suggest to change the OServerPluginManager class line 303

pluginClassLoader = new URLClassLoader(new URL[] { url });

by 

pluginClassLoader = new URLClassLoader(new URL[] { url }, OServerPlugin.class.getClassLoader ());  

This will insure that orientdb will work in embedded mode using a different classloader.

[Bertrand Quenin]

Ok, I was suspecting something like that, without being able to fix it.

Thanks for the tip!

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