Merge branch 'master' of https://github.com/Activiti/Activiti

modules/activiti-engine/src/main/java/org/activiti/engine/delegate/ExecutionListener.java

@@ -12,6 +12,8 @@
  */
 package org.activiti.engine.delegate;
 
+import java.io.Serializable;
+
 
 
 
@@ -21,7 +23,7 @@ package org.activiti.engine.delegate;
  * @author Tom Baeyens
  * @author Joram Barrez
  */
-public interface ExecutionListener {
+public interface ExecutionListener extends Serializable {
 
   String EVENTNAME_START = "start";
   String EVENTNAME_END = "end";

modules/activiti-engine/src/main/java/org/activiti/engine/delegate/Expression.java

@@ -13,13 +13,15 @@
 
 package org.activiti.engine.delegate;
 
+import java.io.Serializable;
+
 
 
 
 /**
  * @author Frederik Heremans
  */
-public interface Expression {
+public interface Expression extends Serializable {
 
    Object getValue(VariableScope variableScope);
    

modules/activiti-engine/src/main/java/org/activiti/engine/delegate/TaskListener.java

@@ -13,6 +13,8 @@
 
 package org.activiti.engine.delegate;
 
+import java.io.Serializable;
+
 
 
 
@@ -20,7 +22,7 @@ package org.activiti.engine.delegate;
 /**
  * @author Tom Baeyens
  */
-public interface TaskListener {
+public interface TaskListener extends Serializable {
 
   String EVENTNAME_CREATE = "create";
   String EVENTNAME_ASSIGNMENT = "assignment";

modules/activiti-engine/src/main/java/org/activiti/engine/form/FormProperty.java

@@ -23,7 +23,7 @@ import org.activiti.engine.FormService;
  * 
  * @author Tom Baeyens
  */
-public interface FormProperty {
+public interface FormProperty extends Serializable {
   
   /** The key used to submit the property in {@link FormService#submitStartFormData(String, java.util.Map)} 
    * or {@link FormService#submitTaskFormData(String, java.util.Map)} */

modules/activiti-engine/src/main/java/org/activiti/engine/identity/Group.java

@@ -22,7 +22,7 @@ import org.activiti.engine.IdentityService;
  * 
  * @author Tom Baeyens
  */
-public interface Group {
+public interface Group extends Serializable {
 
   String getId();
   void setId(String id);

modules/activiti-engine/src/main/java/org/activiti/engine/identity/Picture.java

@@ -21,7 +21,7 @@ import java.io.Serializable;
 /**
  * @author Tom Baeyens
  */
-public class Picture {
+public class Picture implements Serializable {
 
   private static final long serialVersionUID = 2384375526314443322L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/identity/User.java

@@ -21,7 +21,7 @@ import org.activiti.engine.IdentityService;
  * Represents a user, used in {@link IdentityService}.
  * @author Tom Baeyens
  */
-public interface User {
+public interface User extends Serializable {
 
   String getId();
   void setId(String id);

modules/activiti-engine/src/main/java/org/activiti/engine/impl/Condition.java

@@ -21,7 +21,7 @@ import org.activiti.engine.delegate.DelegateExecution;
 /**
  * @author Tom Baeyens
  */
-public interface Condition {
+public interface Condition extends Serializable {
 
   boolean evaluate(DelegateExecution execution);
 }

modules/activiti-engine/src/main/java/org/activiti/engine/impl/EventSubscriptionQueryImpl.java

@@ -16,7 +16,6 @@ package org.activiti.engine.impl;
 import java.io.Serializable;
 import java.util.List;
 
-import org.activiti.engine.ActivitiException;
 import org.activiti.engine.ActivitiIllegalArgumentException;
 import org.activiti.engine.impl.interceptor.CommandContext;
 import org.activiti.engine.impl.interceptor.CommandExecutor;
@@ -26,7 +25,7 @@ import org.activiti.engine.impl.persistence.entity.EventSubscriptionEntity;
 /**
  * @author Daniel Meyer
  */
-public class EventSubscriptionQueryImpl extends AbstractQuery<EventSubscriptionQueryImpl, EventSubscriptionEntity> {
+public class EventSubscriptionQueryImpl extends AbstractQuery<EventSubscriptionQueryImpl, EventSubscriptionEntity> implements Serializable {
 
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/EventSubscriptionQueryValue.java

@@ -19,7 +19,7 @@ import java.io.Serializable;
 /**
  * @author Daniel Meyer
  */
-public class EventSubscriptionQueryValue {
+public class EventSubscriptionQueryValue implements Serializable {
   
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/ProcessEngineInfoImpl.java

@@ -20,7 +20,7 @@ import org.activiti.engine.ProcessEngineInfo;
 /**
  * @author Tom Baeyens
  */
-public class ProcessEngineInfoImpl implements ProcessEngineInfo {
+public class ProcessEngineInfoImpl implements Serializable, ProcessEngineInfo {
 
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/QueryVariableValue.java

@@ -15,7 +15,6 @@ package org.activiti.engine.impl;
 
 import java.io.Serializable;
 
-import org.activiti.engine.ActivitiException;
 import org.activiti.engine.ActivitiIllegalArgumentException;
 import org.activiti.engine.impl.persistence.entity.VariableInstanceEntity;
 import org.activiti.engine.impl.variable.ByteArrayType;
@@ -29,7 +28,7 @@ import org.activiti.engine.impl.variable.VariableTypes;
  * 
  * @author Frederik Heremans
  */
-public class QueryVariableValue {
+public class QueryVariableValue implements Serializable {
   private static final long serialVersionUID = 1L;
   private String name;
   private Object value;

modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/BpmnActivityBehavior.java

@@ -35,7 +35,7 @@ import org.slf4j.LoggerFactory;
  * 
  * @author Joram Barrez
  */
-public class BpmnActivityBehavior {
+public class BpmnActivityBehavior implements Serializable {
   
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/parser/CompensateEventDefinition.java

@@ -13,11 +13,13 @@
 
 package org.activiti.engine.impl.bpmn.parser;
 
+import java.io.Serializable;
+
 
 /**
  * @author Daniel Meyer
  */
-public class CompensateEventDefinition {
+public class CompensateEventDefinition implements Serializable {
 
   protected String activityRef;
   protected boolean waitForCompletion;

modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/parser/ErrorEventDefinition.java

@@ -19,7 +19,7 @@ import java.util.Comparator;
 /**
  * @author Daniel Meyer
  */
-public class ErrorEventDefinition {
+public class ErrorEventDefinition implements Serializable {
   
   public static Comparator<ErrorEventDefinition> comparator = new Comparator<ErrorEventDefinition>() {
     public int compare(ErrorEventDefinition o1, ErrorEventDefinition o2) {

modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/parser/EventSubscriptionDeclaration.java

@@ -28,7 +28,7 @@ import org.activiti.engine.impl.pvm.process.ActivityImpl;
  * @author Falko Menge
  * @author Joram Barrez
  */
-public class EventSubscriptionDeclaration {
+public class EventSubscriptionDeclaration implements Serializable {
 
   private static final long serialVersionUID = 1L;
 

modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/parser/SignalDefinition.java

@@ -20,7 +20,7 @@ import java.io.Serializable;
  * 
  * @author Daniel Meyer
  */
-public class SignalDefinition {
+public class SignalDefinition implements Serializable {
 
   private static final long serialVersionUID = 1L;
     

modules/activiti-engine/src/main/java/org/activiti/engine/impl/calendar/CronExpression.java

@@ -23,7 +23,6 @@ import java.text.ParseException;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.Locale;
 import java.util.Map;
 import java.util.SortedSet;
@@ -197,7 +196,7 @@ import java.util.TreeSet;
  * @author Contributions from Mads Henderson
  * @author Refactoring from CronTrigger to CronExpression by Aaron Craven
  */
-public class CronExpression implements Cloneable {
+public class CronExpression implements Serializable, Cloneable {
 
     private static final long serialVersionUID = 12423409423L;
 

modules/activiti-engine/src/main/java/org/activiti/engine/impl/form/FormHandler.java

@@ -13,8 +13,8 @@
 
 package org.activiti.engine.impl.form;
 
-import java.util.List;
 import java.io.Serializable;
+import java.util.List;
 import java.util.Map;
 
 import org.activiti.bpmn.model.FormProperty;
@@ -26,7 +26,7 @@ import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
 /**
  * @author Tom Baeyens
  */
-public interface FormHandler {
+public interface FormHandler extends Serializable {
 
   ThreadLocal<FormHandler> current = new ThreadLocal<FormHandler>();
 

modules/activiti-engine/src/main/java/org/activiti/engine/impl/javax/el/Expression.java

@@ -28,7 +28,7 @@ import java.util.Hashtable;
  * {@link FunctionMapper}. This allows a container to pre-create expressions and not have to reparse
  * them each time they are evaluated.
  */
-public abstract class Expression {
+public abstract class Expression implements Serializable {
 	private static final long serialVersionUID = 1L;
 
 	/**

modules/activiti-engine/src/main/java/org/activiti/engine/impl/javax/el/ValueReference.java

@@ -22,7 +22,7 @@ import java.io.Serializable;
  * 
  * @since 2.2
  */
-public class ValueReference {
+public class ValueReference implements Serializable {
 	private static final long serialVersionUID = 1L;
 
 	private Object base;

modules/activiti-engine/src/main/java/org/activiti/engine/impl/jobexecutor/TimerDeclarationImpl.java

@@ -29,7 +29,7 @@ import org.activiti.engine.impl.persistence.entity.TimerEntity;
 /**
  * @author Tom Baeyens
  */
-public class TimerDeclarationImpl {
+public class TimerDeclarationImpl implements Serializable {
 
   private static final long serialVersionUID = 1L;
 

modules/activiti-engine/src/main/java/org/activiti/engine/impl/juel/Bindings.java

@@ -40,7 +40,7 @@ public class Bindings implements TypeConverter {
 	/**
 	 * Wrap a {@link Method} for serialization.
 	 */
-	private static class MethodWrapper {
+	private static class MethodWrapper implements Serializable {
 		private static final long serialVersionUID = 1L;
 
 		private transient Method method;

modules/activiti-engine/src/main/java/org/activiti/engine/impl/juel/TreeBuilder.java

@@ -26,7 +26,7 @@ import org.activiti.engine.impl.javax.el.ELException;
  *
  * @author Christoph Beck
  */
-public interface TreeBuilder {
+public interface TreeBuilder extends Serializable {
 	/**
 	 * Parse the given expression and create an abstract syntax tree for it.
 	 * @param expression expression string

modules/activiti-engine/src/main/java/org/activiti/engine/impl/juel/TypeConverter.java

@@ -19,7 +19,7 @@ import java.io.Serializable;
 
 import org.activiti.engine.impl.javax.el.ELException;
 
-public interface TypeConverter {
+public interface TypeConverter extends Serializable {
 	/**
 	 * Default conversions as from JSR245.
 	 */

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/ByteArrayEntity.java

@@ -24,7 +24,7 @@ import org.apache.commons.lang3.ObjectUtils;
  * @author Tom Baeyens
  * @author Marcus Klimstra (CGI)
  */
-public class ByteArrayEntity implements PersistentObject, HasRevision {
+public class ByteArrayEntity implements Serializable, PersistentObject, HasRevision {
 
   private static final long serialVersionUID = 1L;
 

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/ByteArrayRef.java

@@ -17,7 +17,7 @@ import org.activiti.engine.impl.context.Context;
  * 
  * @author Marcus Klimstra (CGI)
  */
-public final class ByteArrayRef {
+public final class ByteArrayRef implements Serializable {
   
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/DeploymentEntity.java

@@ -29,7 +29,7 @@ import org.activiti.engine.repository.Deployment;
 /**
  * @author Tom Baeyens
  */
-public class DeploymentEntity implements Deployment, PersistentObject {
+public class DeploymentEntity implements Serializable, Deployment, PersistentObject {
 
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/HistoricIdentityLinkEntity.java

@@ -24,7 +24,7 @@ import org.activiti.engine.impl.db.PersistentObject;
 /**
  * @author Frederik Heremans
  */
-public class HistoricIdentityLinkEntity implements HistoricIdentityLink, PersistentObject {
+public class HistoricIdentityLinkEntity implements Serializable, HistoricIdentityLink, PersistentObject {
   
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/IdentityLinkEntity.java

@@ -27,7 +27,7 @@ import org.activiti.engine.task.IdentityLink;
 /**
  * @author Joram Barrez
  */
-public class IdentityLinkEntity implements IdentityLink, PersistentObject {
+public class IdentityLinkEntity implements Serializable, IdentityLink, PersistentObject {
   
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/JobEntity.java

@@ -39,7 +39,7 @@ import org.apache.commons.lang3.StringUtils;
  * @author Dave Syer
  * @author Frederik Heremans
  */
-public abstract class JobEntity implements Job, PersistentObject, HasRevision {
+public abstract class JobEntity implements Job, PersistentObject, HasRevision, Serializable {
 
   public static final boolean DEFAULT_EXCLUSIVE = true;
   public static final int DEFAULT_RETRIES = 3;

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/MembershipEntity.java

@@ -21,7 +21,7 @@ import org.activiti.engine.impl.db.PersistentObject;
  * @author Tom Baeyens
  * @author Joram Barrez
  */
-public class MembershipEntity implements PersistentObject {
+public class MembershipEntity implements PersistentObject, Serializable {
 
   private static final long serialVersionUID = 1L;
 

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/ModelEntity.java

@@ -28,7 +28,7 @@ import org.activiti.engine.repository.Model;
  * @author Tijs Rademakers
  * @author Joram Barrez
  */
-public class ModelEntity implements Model, HasRevision, PersistentObject {
+public class ModelEntity implements Model, HasRevision, PersistentObject, Serializable {
 
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/ResourceEntity.java

@@ -21,7 +21,7 @@ import org.activiti.engine.impl.db.PersistentObject;
 /**
  * @author Tom Baeyens
  */
-public class ResourceEntity implements PersistentObject {
+public class ResourceEntity implements PersistentObject, Serializable {
 
   private static final long serialVersionUID = 1L;
 

modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/VariableScopeImpl.java

@@ -36,7 +36,7 @@ import org.activiti.engine.impl.variable.VariableTypes;
  * @author Joram Barrez
  * @author Tijs Rademakers
  */
-public abstract class VariableScopeImpl implements VariableScope {
+public abstract class VariableScopeImpl implements Serializable, VariableScope {
   
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/pvm/PvmProcessElement.java

@@ -19,7 +19,7 @@ import java.io.Serializable;
 /**
  * @author Tom Baeyens
  */
-public interface PvmProcessElement {
+public interface PvmProcessElement extends Serializable {
 
   String getId();
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/pvm/delegate/ActivityBehavior.java

@@ -18,7 +18,7 @@ import java.io.Serializable;
 /**
  * @author Tom Baeyens
  */
-public interface ActivityBehavior {
+public interface ActivityBehavior extends Serializable {
 
   void execute(ActivityExecution execution) throws Exception;
 }

modules/activiti-engine/src/main/java/org/activiti/engine/impl/pvm/process/LaneSet.java

@@ -24,7 +24,7 @@ import java.util.List;
  * 
  * @author Frederik Heremans
  */
-public class LaneSet {
+public class LaneSet implements Serializable {
 
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/impl/scripting/ScriptingEngines.java

@@ -12,9 +12,12 @@
  */
 package org.activiti.engine.impl.scripting;
 
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import javax.script.Bindings;
+import javax.script.ScriptContext;
 import javax.script.ScriptEngine;
 import javax.script.ScriptEngineFactory;
 import javax.script.ScriptEngineManager;
@@ -26,13 +29,18 @@ import org.activiti.engine.delegate.VariableScope;
 /**
  * @author Tom Baeyens
  * @author Joram Barrez
+ * @author Frederik Heremans
  */
 public class ScriptingEngines {
 
   public static final String DEFAULT_SCRIPTING_LANGUAGE = "juel";
+  public static final String GROOVY_SCRIPTING_LANGUAGE = "groovy";
 
   private final ScriptEngineManager scriptEngineManager;
   protected ScriptBindingsFactory scriptBindingsFactory;
+  
+  protected boolean cacheScriptingEngines = true;
+  protected Map<String, ScriptEngine> cachedEngines;
 
   public ScriptingEngines(ScriptBindingsFactory scriptBindingsFactory) {
     this(new ScriptEngineManager());
@@ -41,6 +49,7 @@ public class ScriptingEngines {
 
   public ScriptingEngines(ScriptEngineManager scriptEngineManager) {
     this.scriptEngineManager = scriptEngineManager;
+    cachedEngines = new HashMap<String, ScriptEngine>();
   }
 
   public ScriptingEngines addScriptEngineFactory(ScriptEngineFactory scriptEngineFactory) {
@@ -63,14 +72,17 @@ public class ScriptingEngines {
   public Object evaluate(String script, String language, VariableScope variableScope, boolean storeScriptVariables) {
     return evaluate(script, language, createBindings(variableScope, storeScriptVariables));
   }
+
+  public void setCacheScriptingEngines(boolean cacheScriptingEngines) {
+	  this.cacheScriptingEngines = cacheScriptingEngines;
+  }
+  
+  public boolean isCacheScriptingEngines() {
+	  return cacheScriptingEngines;
+  }
   
   protected Object evaluate(String script, String language, Bindings bindings) {
-    ScriptEngine scriptEngine = scriptEngineManager.getEngineByName(language);
-
-    if (scriptEngine == null) {
-      throw new ActivitiException("Can't find scripting engine for '" + language + "'");
-    }
-
+    ScriptEngine scriptEngine = getEngineByName(language);
     try {
       return scriptEngine.eval(script, bindings);
     } catch (ScriptException e) {
@@ -78,6 +90,42 @@ public class ScriptingEngines {
     }
   }
 
+  protected ScriptEngine getEngineByName(String language) {
+  	ScriptEngine scriptEngine = null;
+  	
+  	if(cacheScriptingEngines) {
+  		scriptEngine = cachedEngines.get(language);
+  		if(scriptEngine == null) {
+  			scriptEngine = scriptEngineManager.getEngineByName(language);
+  			
+  			if(scriptEngine != null) {
+  				// ACT-1858: Special handling for groovy engine regarding GC
+  				if(GROOVY_SCRIPTING_LANGUAGE.equals(language)) {
+  					try {
+  						scriptEngine.getContext().setAttribute("#jsr223.groovy.engine.keep.globals", "weak", ScriptContext.ENGINE_SCOPE);
+  					} catch(Exception ignore) {
+  						// ignore this, in case engine doesn't support the passed attribute
+  					}
+  				}
+  				
+  				// Check if script-engine allows caching, using "THREADING" parameter as defined in spec
+  				Object threadingParameter = scriptEngine.getFactory().getParameter("THREADING");
+  				if(threadingParameter != null) {
+  					// Add engine to cache as any non-null result from the threading-parameter indicates at least MT-access
+  					cachedEngines.put(language, scriptEngine);
+  				}
+  			}
+  		}
+  	} else {
+  		scriptEngine = scriptEngineManager.getEngineByName(language);
+  	}
+  	
+  	if (scriptEngine == null) {
+      throw new ActivitiException("Can't find scripting engine for '" + language + "'");
+    }
+  	return scriptEngine;
+  }
+  
   /** override to build a spring aware ScriptingEngines */
   protected Bindings createBindings(VariableScope variableScope) {
     return scriptBindingsFactory.createBindings(variableScope); 

modules/activiti-engine/src/main/java/org/activiti/engine/impl/task/TaskDefinition.java

@@ -29,7 +29,7 @@ import org.activiti.engine.impl.form.TaskFormHandler;
  * 
  * @author Joram Barrez
  */
-public class TaskDefinition {
+public class TaskDefinition implements Serializable {
 
   private static final long serialVersionUID = 1L;
 

modules/activiti-engine/src/main/java/org/activiti/engine/query/QueryProperty.java

@@ -21,7 +21,7 @@ import java.io.Serializable;
  * 
  * @author Frederik Heremans
  */
-public interface QueryProperty {
+public interface QueryProperty extends Serializable {
 
   String getName();
 }

modules/activiti-engine/src/main/java/org/activiti/engine/repository/DiagramEdgeWaypoint.java

@@ -21,7 +21,7 @@ import java.io.Serializable;
  *
  * @author Falko Menge
  */
-public class DiagramEdgeWaypoint {
+public class DiagramEdgeWaypoint implements Serializable {
 
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/repository/DiagramElement.java

@@ -20,7 +20,7 @@ import java.io.Serializable;
  *
  * @author Falko Menge
  */
-abstract public class DiagramElement {
+abstract public class DiagramElement implements Serializable {
 
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/repository/DiagramLayout.java

@@ -25,7 +25,7 @@ import java.util.Map.Entry;
  *
  * @author Falko Menge
  */
-public class DiagramLayout {
+public class DiagramLayout implements Serializable {
 
   private static final long serialVersionUID = 1L;
   

modules/activiti-engine/src/main/java/org/activiti/engine/task/Event.java

@@ -25,7 +25,7 @@ import org.activiti.engine.TaskService;
  * @see {@link TaskService#getTaskEvents(String)
  * @author Tom Baeyens
  */
-public interface Event {
+public interface Event extends Serializable {
   
   /** A user identity link was added with following message parts:
    * [0] userId

userguide/src/en/chapters/ch07b-BPMN-Constructs.xml

@@ -6159,4 +6159,48 @@ Exactly the same way, the list of groups that is configured as a potential start
    </programlisting>
 </para>
 </section>	
+
+<section id="dataobjects">
+      <title>Data objects</title>
+      <link linkend="experimental">
+      <emphasis role="bold">[EXPERIMENTAL]</emphasis>
+    </link>
+    <para>
+      BPMN provides the possibility to define data objects as part of a process or sub process element. According to the BPMN specification it's possible to include complex XML structures
+      that might be imported from XSD definitions. As a first start to support data objects in Activiti the folowing XSD types are supported:
+    </para>
+    <itemizedlist>
+      <programlisting>
+        &lt;dataObject id="dObj1" name="StringTest" itemSubjectRef="xsd:string"/&gt;
+      </programlisting>
+      <programlisting>
+        &lt;dataObject id="dObj2" name="BooleanTest" itemSubjectRef="xsd:boolean"/&gt;
+      </programlisting>
+      <programlisting>
+        &lt;dataObject id="dObj3" name="DateTest" itemSubjectRef="xsd:datetime"/&gt;
+      </programlisting>
+      <programlisting>
+        &lt;dataObject id="dObj4" name="DoubleTest" itemSubjectRef="xsd:double"/&gt;
+      </programlisting>
+      <programlisting>
+        &lt;dataObject id="dObj5" name="IntegerTest" itemSubjectRef="xsd:int"/&gt;
+      </programlisting>
+      <programlisting>
+        &lt;dataObject id="dObj6" name="LongTest" itemSubjectRef="xsd:long"/&gt;
+      </programlisting>
+    </itemizedlist>
+    <para>
+      The data object definitions will be automatically converted to process variables using the 'name' attribute value as the name for the new variable.
+      In addition to the definition of the data object Activiti also provides an extension element to assign a default value to the variable. The following BPMN snippet provides an example:
+    </para>
+    <programlisting>
+        &lt;process id="dataObjectScope" name="Data Object Scope" isExecutable="true"&gt;
+          &lt;dataObject id="dObj123" name="StringTest123" itemSubjectRef="xsd:string"&gt;
+            &lt;extensionElements&gt;
+              &lt;activiti:value&gt;Testing123&lt;/activiti:value&gt;
+            &lt;/extensionElements&gt;
+          &lt;/dataObject&gt;
+      </programlisting>
+</section>
+
 </chapter>