vue3使用iframe嵌入ureport2设计器,解决预览时NullPointerException异常问题

@Configuration
public class ReportBean {
    //添加 report 的servlet
    @Bean
    public ServletRegistrationBean<Servlet> ureport2Servlet() {
        return new ServletRegistrationBean<>(new UReportServlet(), "/ureport/*");
    }
    //这一步省略了创建配置文件
    @Bean
    public UReportPropertyPlaceholderConfigurer UReportPropertyPlaceholderConfigurer() {
        UReportPropertyPlaceholderConfigurer propertyConfigurer = new UReportPropertyPlaceholderConfigurer();
        propertyConfigurer.setIgnoreUnresolvablePlaceholders(true);
        ClassPathResource pathResource = new ClassPathResource("config/config.properties");
        propertyConfigurer.setLocation(pathResource);
        return propertyConfigurer;
    }
}

@Configuration
//导入ureport-console-context.xml文件
@ImportResource("classpath:config/context.xml")
@Slf4j
public class ReportConfig implements BuildinDatasource {
    @Autowired
    private DataSource dataSource;
    /**
     * 数据源名称
     **/
    @Override
    public String name() {
        return "ReportSource";
    }
    /**
     * 获取连接
     **/
    @Override
    public Connection getConnection() {
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            log.error("Ureport 数据源 获取连接失败！");
            e.printStackTrace();
        }
        return null;
    }
}

<template>
	<div v-loading="loading" class="h-full">
		<iframe :src="src" frameborder="no" class="wh-full" scrolling="auto" />
	</div>
</template>

<script setup lang="tsx">
import { ref } from 'vue';
const src = ref<string>('/ureport/designer');
const loading = ref<boolean>(true);
</script>

'/ureport': {
	target: envConfig.secondUrl,
    changeOrigin: true,
    rewrite: path => path.replace(new RegExp(`^${envConfig.urlPattern}`), '/ureport')
}

export declare interface ProxyOptions extends HttpProxy.ServerOptions {
    /**
     * rewrite path
     */
    rewrite?: (path: string) => string;
    /**
     * configure the proxy server (e.g. listen to events)
     */
    configure?: (proxy: HttpProxy.Server, options: ProxyOptions) => void;
    /**
     * webpack-dev-server style bypass function
     */
    bypass?: (req: http.IncomingMessage, res: http.ServerResponse, options: ProxyOptions) => void | null | undefined | false | string;
}

'/ureport': {
    target: envConfig.secondUrl,
    changeOrigin: true,
    rewrite: path => path.replace(new RegExp(`^${envConfig.urlPattern}`), '/ureport'),
    bypass: (req, res, proxyOption) => {
      req.url = req.originalUrl;
    }
}