<project ...>
	<dependencies>
		<dependency>
			<groupId>com.atlassian.jira</groupId>
			<artifactId>jira-api</artifactId>
			<version>${jira.version}</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>fr.alkaes.minyaa</groupId>
			<artifactId>jira-plugin-minyaa-time</artifactId>
			<version>${minyaa.time.version}</version>
			<scope>provided</scope>
		</dependency>
	</dependencies>
	...
	<properties>
		<jira.version>7.3.0</jira.version>
		<jira.data.version>${jira.version}</jira.data.version>
		<minyaa.time.version>7300.1.16</minyaa.time.version>
	</properties>
</project>

<project ...>
    <build>
        <plugins>
            <plugin>
                <groupId>com.atlassian.maven.plugins</groupId>
                <artifactId>maven-jira-plugin</artifactId>
                <version>${amps.version}</version>
                <extensions>true</extensions>
                <configuration>
                    <productVersion>${jira.version}</productVersion>
                    <productDataVersion>${jira.data.version}</productDataVersion>
                    <instructions>
                        <Bundle-SymbolicName>${project.groupId}.${project.artifactId}</Bundle-SymbolicName>
                        <Spring-Context>*;timeout:=60</Spring-Context>
                        <Import-Package>
                            *;resolution:=optional
                        </Import-Package>
                        <Export-Package>com.yourcompany.jira.worklogfields.*</Export-Package>
                    </instructions>
                </configuration>
            </plugin>
            ...
        </plugins>
    </build>
    ...
    <properties>
        <amps.version>6.2.2</amps.version>
        <jira.version>7.3.0</jira.version>
        <jira.data.version>${jira.version}</jira.data.version>
        ...
    <properties>
</project>

public interface WorklogField {
 
   /**
    * @return the Module Descriptor for Worklog Field
    */
   WorklogFieldModuleDescriptor getDescriptor();
 
   /**
    * @return the Key of the field as defined in its descriptor
    */
   public String getKey();
 
   /**
    * @return the Name of the OFBiz Entity where the field will be stored
    */
   public String getEntityName();
 
   /**
    * @return the Name of the field as it will be used in the OFBiz Entity
    */
   public String getFieldName();
 
   /**
    * @return the Id of the field as it will be used in the HTML Form
    */
   public String getId();
 
   /**
    * @return a generated Complete Key used to identify the field among all fields provided by any plugin
    */
   public String getCompleteKey();
 
   /**
    * @return the key of the field as defined in its descriptor
    */
   public WorklogField newWorklogField();
 
   /**
    * @return the display name as it will be displayed in the GUI (No I18n supported yet)
    */
   public String getDisplayName();
 
   /**
    * @return the value as it is passed from HTML Form
    */
   public Object getValue();
 
   /**
    * Sets the value of field
    */
   public void setValue(Object value);
 
   /**
    * @return the default value of (user uninitialized) field
    */
   public Object getDefaultValue();
 
   /**
    * Performs syntax and semantic (eg. hours between 0 and 23) field validation.
    * @param worklogFields Map of all passed Worklog Fields. It may be required to perform validation against other passed Worklog Fields
    * @return true if field validated OK, false otherwise
    */
   public boolean validate(final Map<String,WorklogField> worklogFields);
 
   /**
    * NOTE YET USED !!
    * Calculates field visibility depending on its value or/and potentially other field values
    * @param worklogFields Map of all passed Worklog Fields. It may be required to evaluate other passed Worklog Fields
    * @return true if hidden, false otherwise
    */
   public boolean hide(final List _worklogFields);
 
   /**
    * @return display type is the input control type (text, select, radio, checkbox, ...) to use in the HTML Form
    */
   public String getDisplayType();
 
   /**
    * @return The Native Value is the Raw value as it has to be stored by OFBiz
    */
   public Object getNativeValue();
 
   public void formatForDisplay();
 
   public Worklog getWorklog();
 
   public void setWorklog(final Worklog _worklog);
    
   public String getValidationError();
 
}

package fr.alkaes.myaatm.worklog.fields.impl;
import java.util.List;
import fr.alkaes.myaatm.worklog.fields.AbstractWorklogField;
/**
 * @FQCN fr.alkaes.myaatm.worklog.fields.impl.Chargeable
 * @author vthoule (Alkaes Consulting)
 * @since [6400/7300].1.16
 * @version [6400/7300].1.16
 * @description
 */
public class Chargeable extends AbstractWorklogField {
 
   private static final long serialVersionUID = 1L;
 
   public Chargeable() {
      // Here is defined the list of allowed values.
      allowedValues = new String[] { "0", "1", "false", "true" };
   }
 
   /** @return the Display Name, as it will be displayed in the HTML Form */
   public String getDisplayName() {
      return "Chargeable";
   }
 
   /** @return Default Value*/
   public Object getDefaultValue() {
      return "false";
   }
 
   /** Return if the field has be shown or not (NOT Yet used)
    */
   public boolean hide(List iWorklogFields) {
      return false;
   }
 
   /** @return HTML type of field */
   public String getDisplayType() {
      return "checkbox";
   }
}

<plugin-model key="SampleWorklogField" name="Sample Worklog Fields" >
	<resource type="ofbiz" name="entity" location="fr/alkaes/myaatm/entitydefs/sample/entitymodel.worklogfields.xml"/>
	<resource type="ofbiz" name="entitygroup" location="fr/alkaes/myaatm/entitydefs/sample/entitygroup.worklogfields.xml"/>
</plugin-model>

<worklog-field weight="1" key="chargeable" name="Chargeable" 
	class="fr.alkaes.myaatm.worklog.fields.impl.Chargeable" 
	field-name="chargeable" entity-name="SampleWorklogField"
	i18n-description-key="yourcompany.worklog.field.chargeable.description" />

<resource type="i18n" name="i18n" location="com.yourcompany.customworklog.i18n.i18n" />

## -------------------------------------------------
## Your Worklog Fields
## -------------------------------------------------
yourcompany.worklogfield.chargeable.description=Check it, if the related spent time is chargeable.