We are using SDL web 8.5 and while publishing any item it was failing at deploying stage. After clearing old transaction and zip files from deployer server and restarting deployer service the issue gets resolved but we are still not able to find why this issue occurs. Error message in the log file is below
ERROR ModuleFactory - Unable to create module
com.tridion.configuration.ConfigurationException: Unable to load Module
at com.tridion.deployer.ModuleFactory.createModule(ModuleFactory.java:115)
at com.tridion.deployer.ModuleFactory.createModuleOnPreference(ModuleFactory.java:72)
at com.sdl.delivery.deployer.steps.TridionDeployerStepAdapter.configure(TridionDeployerStepAdapter.java:59)
at com.sdl.delivery.deployer.steps.TridionExecutableStepFactory.processConfiguration(TridionExecutableStepFactory.java:169)
at com.sdl.delivery.deployer.steps.TridionExecutableStepFactory.create(TridionExecutableStepFactory.java:140)
at com.sdl.delivery.deployer.engine.step.BasicExecutableStepFactoryManager.getStep(BasicExecutableStepFactoryManager.java:44)
at com.sdl.delivery.deployer.engine.pipeline.actor.StepActor.execute(StepActor.scala:66)
at com.sdl.delivery.deployer.engine.pipeline.actor.StepActor.com$sdl$delivery$deployer$engine$pipeline$actor$StepActor$$processStep(StepActor.scala:57)
at com.sdl.delivery.deployer.engine.pipeline.actor.StepActor$$anonfun$receive$1.applyOrElse(StepActor.scala:40)
at akka.actor.Actor$class.aroundReceive(Actor.scala:480)
at com.sdl.delivery.deployer.engine.pipeline.actor.StepActor.aroundReceive(StepActor.scala:26)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
at akka.actor.ActorCell.invoke(ActorCell.scala:495)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
at akka.dispatch.Mailbox.run(Mailbox.scala:224)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.tridion.util.TridionReflectionException: Unable to load request class, was not found on classpath
at com.tridion.util.ReflectionUtil.loadClassInstanceWithTypes(ReflectionUtil.java:65)
at com.tridion.deployer.ModuleFactory.createModule(ModuleFactory.java:109)
... 17 common frames omitted
Caused by: java.lang.ClassNotFoundException:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.tridion.util.ReflectionUtil.loadClassInstanceWithTypes(ReflectionUtil.java:59)
... 18 common frames omitted
Another issue in deployer config worker cleanup property is set to True but still deployer is not able to clean processed zip files we have to clean up this manually.
