I am starting with Drools. I am using Drools Flow 5.0.1, Eclipse 5.2, JDK 1.6.0. I am trying to run the Evaluation Example. It has just 3 human tasks. I launched a Mina task Server that seems to work fine. Error occurs on the server when launching the ruflow that is trying to add the task to the server. [10:01:12] NioProcessor-1 INFO [] [] [org.apache.mina.filter.logging.LoggingFilter] - CREATED [10:01:12] NioProcessor-1 INFO [] [] [org.apache.mina.filter.logging.LoggingFilter] - OPENED [10:01:12] NioProcessor-1 INFO [] [] [org.apache.mina.filter.logging.LoggingFilter] - RECEIVED: HeapBuffer[pos=0 lim=404 cap=2048: 00 00 01 90 AC ED 00 05 73 72 01 00 1F 6F 72 67...] [2010:04:91 10:04:60:exception] Uncaught exception on Server org.apache.mina.filter.codec.ProtocolDecoderException: org.apache.mina.core.buffer.BufferDataException: java.io.EOFException (Hexdump: 00 00 01 90 AC ED 00 05 73 72 01 00 1F 6F 72 67 2E 64 72 6F 6F 6C 73 2E 74 61 73 6B 2E 73 65 72 76 69 63 65 2E 43 6F 6D 6D 61 6E 64 78 70 00 00 00 00 73 72 01 00 13 6A 61 76 61 2E 75 74 69 6C 2E 41 72 72 61 79 4C 69 73 74 78 70 00 00 00 02 77 04 00 00 00 02 73 72 01 00 14 6F 72 67 2E 64 72 6F 6F 6C 73 2E 74 61 73 6B 2E 54 61 73 6B 78 70 77 D0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 05 65 6E 2D 55 4B 00 0A 45 76 61 6C 75 61 74 69 6F 6E 00 00 00 01 00 00 00 00 00 00 00 00 00 05 65 6E 2D 55 4B 00 0F 53 65 6C 66 20 45 76 61 6C 75 61 74 69 6F 6E 00 00 00 01 00 00 00 00 00 00 00 00 00 05 65 6E 2D 55 4B 00 0F 53 65 6C 66 20 45 76 61 6C 75 61 74 69 6F 6E 01 00 00 00 00 01 00 00 00 03 66 72 61 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 0D 41 64 6D 69 6E 69 73 74 72 61 74 6F 72 00 00 00 00 00 01 01 00 07 43 72 65 61 74 65 64 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 78 70 78 7E 72 01 00 23 6F 72 67 2E 64 72 6F 6F 6C 73 2E 74 61 73 6B 2E 73 65 72 76 69 63 65 2E 43 6F 6D 6D 61 6E 64 4E 61 6D 65 78 72 01 00 0E 6A 61 76 61 2E 6C 61 6E 67 2E 45 6E 75 6D 78 70 74 00 0E 41 64 64 54 61 73 6B 52 65 71 75 65 73 74) at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:180) at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414) at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49) at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832) at org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilter.java:95) at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414) at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49) at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832) at org.apache.mina.core.filterchain.DefaultIoFilterChain$HeadFilter.messageReceived(DefaultIoFilterChain.java:616) at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414) at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:408) at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:578) at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:540) at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:532) at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:58) at org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(AbstractPollingIoProcessor.java:857) at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: org.apache.mina.core.buffer.BufferDataException: java.io.EOFException at org.apache.mina.core.buffer.AbstractIoBuffer.getObject(AbstractIoBuffer.java:1630) at org.apache.mina.filter.codec.serialization.ObjectSerializationDecoder.doDecode(ObjectSerializationDecoder.java:93) at org.apache.mina.filter.codec.CumulativeProtocolDecoder.decode(CumulativeProtocolDecoder.java:173) at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:170) ... 19 more Caused by: java.io.EOFException at java.io.ObjectInputStream$BlockDataInputStream.readBoolean(Unknown Source) at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readBoolean(Un... Source) at org.drools.task.Task.readExternal(Task.java:139) at java.io.ObjectInputStream.readExternalData(Unknown Source) at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io.ObjectInputStream.readObject(Unknown Source) at java.util.ArrayList.readObject(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at java.io <http://java.io.objectstreamclass.in/>.ObjectStreamClass.invokeReadObje... Source) at java.io.ObjectInputStream.readSerialData(Unknown Source) at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io <http://java.io.objectinputstream.de/>.ObjectInputStream.defaultReadFie... Source) at java.io.ObjectInputStream.readSerialData(Unknown Source) at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io.ObjectInputStream.readObject(Unknown Source) at org.apache.mina.core.buffer.AbstractIoBuffer.getObject(AbstractIoBuffer.java:1628) ... 22 more The Server Code is: import org.drools.SystemEventListenerFactory; import org.drools.task.Task; import org.drools.task.User; import org.drools.task.service.ContentData; import org.drools.task.service.MinaTaskServer; import org.drools.task.service.TaskService; import org.drools.task.service.TaskServiceSession; public class Server { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.drools.task"); TaskService taskService = new TaskService(emf, SystemEventListenerFactory.getSystemEventListener()); TaskServiceSession taskSession = taskService.createSession(); //Ajouter user. taskSession.addUser(new User("Mary")); taskSession.addUser(new User("John")); taskSession.addUser(new User("fra")); MinaTaskServer server = new MinaTaskServer( taskService ); Thread thread = new Thread( server ); thread.start(); } } And the Process part is: package com.sample; import java.util.HashMap; import java.util.Map; import org.drools.KnowledgeBase; import org.drools.KnowledgeBaseFactory; import org.drools.builder.KnowledgeBuilder; import org.drools.builder.KnowledgeBuilderError; import org.drools.builder.KnowledgeBuilderErrors; import org.drools.builder.KnowledgeBuilderFactory; import org.drools.builder.ResourceType; import org.drools.io <http://org.drools.io.re/>.ResourceFactory; import org.drools.logger.KnowledgeRuntimeLogger; import org.drools.logger.KnowledgeRuntimeLoggerFactory; import org.drools.process.workitem.wsht.WSHumanTaskHandler; import org.drools.runtime.StatefulKnowledgeSession; import org.drools.runtime.process.ProcessInstance; /** * This is a sample file to launch a process. */ public class RuleFlowTest { public static final void main(String[] args) { try { // load up the knowledge base KnowledgeBase kbase = readKnowledgeBase(); StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test"); //NEW ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new WSHumanTaskHandler()); Map<String, Object> params = new HashMap<String, Object>(); params.put("employee","fra"); // end NEW // start a new process instance ProcessInstance processInstance = ksession.startProcess("com.sample.ruleflow",params); //modificat params ksession.insert(processInstance); logger.close(); } catch (Throwable t) { t.printStackTrace(); } }java.io.EOFException when trying Drools rulefow Evaluation example private static KnowledgeBase readKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("ruleflow.rf"), ResourceType.DRF); KnowledgeBuilderErrors errors = kbuilder.getErrors(); if (errors.size() > 0) { for (KnowledgeBuilderError error: errors) { System.err.println(error); } throw new IllegalArgumentException("Could not parse knowledge."); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); return kbase; } } Thankyou in advance a lot for you help.