[jboss-user] [JBoss jBPM] - Re: How to use hibernate session in jbpm xhtml files

[dleerob]

I'm not sure how it's done using JSF, but I make use of my own tags to access info from jbpm libraries/database. Here's an example of how I do it:

/**
  |  * This tag will create an html dropdown list of all the current
  |  * groups within the jbpm database, where the value and label of 
  |  * each option is the group name.
  |  * 
  |  * @jsp.tag name="groupSelectBox" bodycontent="empty"
  |  */
  | public class GroupListTag extends BaseTag {
  | 
  | 	private static final long serialVersionUID = 1L;
  | 	protected String name = null;
  | 	protected String type = null;
  | 
  | 	/**
  | 	 *
  | 	 */
  | 	protected void execute() throws Exception {
  | 		JbpmContext jbpmContext = null;
  | 		try {        
  | 			jbpmContext = StaticVariables.jbpmConfiguration.createJbpmContext();
  | 			//get list of jbpm groups
  | 			Session session = jbpmContext.getSession();
  | 			String hibernateQuery = "from org.jbpm.identity.Group g";
  | 			if (type != null) {
  | 				//we then only want groups with the given group type.
  | 				hibernateQuery += " where g.type = '"+type+"'";
  | 			}
  | 			List jbpmGroupList = session.createQuery(hibernateQuery).list();
  | 			//create html drop down list of desired groups.
  | 			jspOut.println("<SELECT name='"+name+"'>");
  | 			jspOut.println("<OPTION value=''>-- Please Select --</OPTION>");
  | 			for (int x = 0; x < jbpmGroupList.size(); x++) {
  | 				Group group = (Group)jbpmGroupList.get(x);
  | 				jspOut.println("<OPTION value='"+group.getName()+"'>"+group.getName()+"</OPTION>");
  | 			}
  | 			jspOut.println("</SELECT>");
  | 		}
  | 		catch (Exception e) {
  | 			e.printStackTrace();
  | 		}
  | 		finally {
  | 			jbpmContext.close();
  | 		}
  | 	}
  | 
  | 	/**
  | 	 * Setter for name of the dropdown list.
  | 	 * @jsp.attribute required="true" rtexprvalue="true"
  | 	 */
  | 	public void setName(String name) {
  | 		this.name = name;
  | 	}
  | 
  | 	/**
  | 	 * Setter for the type of group.
  | 	 * @jsp.attribute required="false" rtexprvalue="true"
  | 	 */
  | 	public void setType(String type) {
  | 		this.type = type;
  | 	}

My .tld is auto generated, using the xdoclet tags you see above. Here's what it may look like:
<taglib>
  | 
  |    <tlib-version>1.0</tlib-version>
  |    <jsp-version>1.2</jsp-version>
  |    <short-name>workflow</short-name>
  | 
  |    <description><![CDATA[Custom tag library for this application]]></description>
  | 
  |    <tag>
  | 
  |       <name>groupSelectBox</name>
  |       <tag-class>workflow.webapp.taglib.DepartmentListTag</tag-class>
  | 
  |       <attribute>
  |          <name>name</name>
  |          <required>true</required>
  |          <rtexprvalue>true</rtexprvalue>
  | 
  |       </attribute>
  |       <attribute>
  |          <name>type</name>
  |          <required>false</required>
  |          <rtexprvalue>true</rtexprvalue>
  | 
  |       </attribute>
  | 
  |    </tag>
  | </taglib>

Finally, my JSP page that makes use of the tag:
<workflow:groupSelectBox name="CostCentre" type="Cost Centre"/>

Hope it gives you some ideas...

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