从 BIRT 2.5.2 升级到 3.7.1

Question

我们之前使用下面的代码来设置 BIRT 引擎以在我们的 servlet 中使用，迁移指南说您只需将 BIRT jar 添加到类路径，BIRT jar 已添加到 WEB-INF\lib。

当我们现在运行应用程序时，IReportEngineFactory 返回 null。任何帮助表示赞赏。

public static synchronized IReportEngine getBirtEngine(ServletContext sc) throws Exception {

    EngineConfig config  = new EngineConfig();
    config.setBIRTHome("");


    config.setLogConfig("C:/Temp", Level.FINEST);
    config.setLogFile("birtLog.log");
    realPath = sc.getRealPath("/reports");
    log.info("Server Info:  " + sc.getServerInfo());
    log.info(" Servlet Context Name:  " + sc.getServletContextName());
    log.info("Real Path:  " + realPath);
    log.info("#####Creating new Birt Engine#####");
    //log.info("Birt Home is: " + config.getBIRTHome());
    IPlatformContext context = new PlatformServletContext(sc);
    config.setPlatformContext(context);
    try {
        Platform.startup(config);
        //log.info("Birt Home is: " + config.getPlatformContext().toString());
        IReportEngineFactory factory =  (IReportEngineFactory) Platform.createFactoryObject
                (IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);
        birtEngine = factory.createReportEngine(config);
    }
    catch (Exception e ) {
        throw e;
    }

    return birtEngine;
}

Answer 1

添加以下行解决了我的自定义 BirtEngine.java 配置中的问题：

IPlatformContext context = new PlatformServletContext(sc);
config.getAppContext().put(EngineConstants.WEBAPP_CLASSPATH_KEY, "");

Answer 2

在网上的许多帖子中，我读到您不能再设置 BIRT 主目录和平台上下文。所以你的代码应该变成这样：

public static synchronized IReportEngine getBirtEngine() throws Exception {

    EngineConfig config  = new EngineConfig();
    config.setLogConfig("C:/Temp", Level.FINEST);
    config.setLogFile("birtLog.log");

    try {
        Platform.startup(config);
        IReportEngineFactory factory = (IReportEngineFactory) Platform.createFactoryObject
                (IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);
        birtEngine = factory.createReportEngine(config);
    }
    catch (Exception e ) {
        throw e;
    }

    return birtEngine;
}