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
{
				URL url = context.getResource( "/" ); 
				if ( url != null )
					realPath = DataUtil.trimString( url.getFile( ) ) + path;
			}
		}
		catch ( Exception e )
		{
			realPath = path;
		}
		return realPath;
	}
	/**
	 * Make directory
	 * 
	 * @param path
	 * @return
	 */
	private static boolean makeDir( String path )
	{
		assert path != null;
		File file = new File( path );
		if ( !file.exists( ) )
			return file.mkdirs( );
		return true;
	}
	/**
	 * Returns the temp image folder with session id
	 * 
	 * @param request