Bug 176681 Issue about creating context-parameter path in read-only path[0601]
Description: Issue about creating context-parameter path in read-only path Build number:2.2.0.v20070308 Steps to reproduce: 1. Deploy birt. 2. Set BIRT_VIEWER_DOCUMENT_FOLDER/BIRT_VIEWER_IMAGE_DIR/.. to a read-only path. 3. Preview report. Expected result: Because the path is read-only, folders should be created in ${java.io.tmpdir} Actual result: No folders are created in ${java.io.tmpdir} and reports cannot be previewed in frameset mode.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
if ( !isRelativePath( filePath ) )
				return filePath;
			
			if ( isRelativePath( workingFolder ) )
			{
				filePath = getRealPath( workingFolder + "/" + filePath, request 
						.getSession( ).getServletContext( ) );
			}
			else
			{
				filePath = workingFolder + File.separator + filePath;
			}
		}
		return filePath;
	}
	/**
	 * Create the file path of the the document. The document will be put under
	 * the document folder based on different session id.
	 * 
	 * @param filePath
	 *            the document path cretaed from the report design file.
	 * @param request
	 *            Http request, used to get the session Id.
	 * @return
	 * @throws AxisFault
	 */
	protected static String createDocumentPath( String filePath,
			HttpServletRequest request )
	{
		String documentName = null;