Bug 132914 "Invalid page number" error message is hard coded.
"Invalid page number" error message is hard coded in DocumentProcessor.java. This must be externalized into *.properties file. If there are other hard coded error messages, please also externalize.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
ParameterAccessor.INIT_PARAM_IMAGE_DIR );
		if ( imageDirectory == null || imageDirectory.trim( ).length( ) <= 0
				|| ParameterAccessor.isRelativePath( imageDirectory ) )
		{
			imageDirectory = servletConfig.getServletContext( ).getRealPath(
					"/report/images" ); 
		}
		
		imageBaseUrl = "/run?__imageID="; 
		
		String logDirectory = servletConfig.getServletContext( )
				.getInitParameter( ParameterAccessor.INIT_PARAM_LOG_DIR );
		if ( logDirectory == null || logDirectory.trim( ).length( ) <= 0
				|| ParameterAccessor.isRelativePath( logDirectory ) )
		{
			logDirectory = servletConfig.getServletContext( ).getRealPath(
					"/logs" ); 
		}
		
		String logLevel = servletConfig.getServletContext( ).getInitParameter(
				ParameterAccessor.INIT_PARAM_LOG_LEVEL );
		Level level = Level.OFF;
		if ( "SEVERE".equalsIgnoreCase( logLevel ) ) 
		{
			level = Level.SEVERE;
		}
		else if ( "WARNING".equalsIgnoreCase( logLevel ) ) 
		{
			level = Level.WARNING;
		}