[JIRA-Opensymphony] Created: (WF-172) When creating XML using velocity Classloader can't find template

Message:

  A new issue has been created in JIRA.

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View the issue:

  http://jira.opensymphony.com/secure/ViewIssue.jspa?key=WF-172


Here is an overview of the issue:
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        Key: WF-172
    Summary: When creating XML using velocity Classloader can't find template
       Type: Bug

     Status: Assigned
   Priority: Major

    Project: OSWorkflow
 Components: 
             Core
   Versions:
             1.0

   Assignee: Patrick Lightbody
   Reporter: Jan Kruger

    Created: Wed, 28 May 2003 10:45 AM
    Updated: Wed, 28 May 2003 10:45 AM
Environment: Sun JDK 1.3.1

Description:
When Velocity gets ingratiated by any other code within the same class loader, the Template cannot be found when trying to generate the XML in the workflow code.

The problem is the following:

WorkflowSerializer.java contains this code:

Velocity.setProperty("resource.loader", "class");
Velocity.setProperty(
  "class.resource.loader.class",
  "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
Velocity.init();

The problem is, if you run this code AFTER something has initialized Velocity without adding the ClasspathResourceLoader, setting the property and init()ing Velocity will not reinitialize it. The solution is the following:

/************************* start new code

protected static void initVelocity() throws Exception {
 if (mVelocityEngine == null){
  mVelocityEngine = new VelocityEngine();
  mVelocityEngine.setProperty("resource.loader", "class");
  mVelocityEngine.setProperty(
    "class.resource.loader.class",
    "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
  mVelocityEngine.init();
 }
}

public static byte[] generateWorkflowXML(WorkflowDescriptor wf) throws Exception {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStreamWriter writer = new OutputStreamWriter(baos);

 initVelocity();

 /* ...
  * CODE STAYS THE SAME...
  */
 
}

protected static VelocityEngine mVelocityEngine = null;

/************************* End new code

With the major changes being that we use a local instance of the VelocityEngine rather than the Singleton instance already available in the VM.


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