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
UTFString = new String( s.getBytes( ISO_8859_1_ENCODE ),
						UTF_8_ENCODE );
			}
			catch ( UnsupportedEncodingException e )
			{
				UTFString = s;
			}
		}
		return UTFString;
	}
	/**
	 * Convert the string with the given encoding into UTF-8.
	 * 
	 * @param s
	 *            ISO-8895-1 string
	 * @param encoding
	 *            the current encoding of the string
	 * @return the converted UTF-8 string
	 */
	protected static String toUTFString( String s, String encoding )
	{
		String UTFString = s;
		String sourceEncoding = encoding;
		if ( s != null )
		{
			if ( sourceEncoding == null )
			{
				sourceEncoding = ISO_8859_1_ENCODE;
			}
			try