SymmetricWebServer 未以嵌入式模式启动

Question

我有一个带有 SymetricDS 的 Spring Boot maven 项目。当我以嵌入式模式启动应用程序时，即使我有一个 Spring boot 的 Tomcat，它也在寻找 Jetty。

SymmetricWebServer node = new SymmetricWebServer("server.properties");


<dependency>
   <groupId>org.jumpmind.symmetric</groupId>
   <artifactId>symmetric-server</artifactId>
   <version>3.5.19</version>
</dependency>

例外：

Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/jetty/server/bio/SocketConnector

这是为什么？为什么没有使用 symetric-server 下载依赖项？

Answer 1

对 Jetty 的 maven 依赖是“提供的”，因为 symmetric-server 可以构建为可以部署到任意数量的 Web 服务器的战争。这是我如何使用 Spring Boot 提供的 Web 容器将 SymmetricDS 嵌入到 Spring Boot 中的精髓。

import org.jumpmind.symmetric.common.ParameterConstants;
import org.jumpmind.symmetric.web.ServerSymmetricEngine;
import org.jumpmind.symmetric.web.SymmetricEngineHolder;
import org.jumpmind.symmetric.web.SymmetricServlet;
import org.jumpmind.symmetric.web.WebConstants;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.servlet.ServletContext;
import javax.sql.DataSource;
import java.util.Properties;

@Configuration
public class SymDSModule implements ApplicationListener<ApplicationReadyEvent> {

    @Autowired
    ServletContext servletContext;

    @Autowired
    DataSource dataSource;

    @Autowired
    ApplicationContext applicationContext;

    @Override
    final public void onApplicationEvent(ApplicationReadyEvent event) {
        SymmetricEngineHolder holder = new SymmetricEngineHolder();
        Properties properties = new Properties();

        properties.put(ParameterConstants.DATA_LOADER_IGNORE_MISSING_TABLES, "true");
        properties.put(ParameterConstants.TRIGGER_CREATE_BEFORE_INITIAL_LOAD, "false");
        properties.put(ParameterConstants.AUTO_RELOAD_ENABLED, "true");
        properties.put(ParameterConstants.AUTO_REGISTER_ENABLED, "true");

        ServerSymmetricEngine serverEngine = new ServerSymmetricEngine(dataSource, applicationContext, properties, false, holder);

        holder.getEngines().put(properties.getProperty(ParameterConstants.EXTERNAL_ID), serverEngine);
        holder.setAutoStart(false);
        servletContext.setAttribute(WebConstants.ATTR_ENGINE_HOLDER, holder);

        serverEngine.setup();
        serverEngine.start();
    }

    @Bean
    public ServletRegistrationBean<SymmetricServlet> symServlet() {
        ServletRegistrationBean<SymmetricServlet> bean = new ServletRegistrationBean<>(new SymmetricServlet(), "/sync");
        bean.setLoadOnStartup(1);
        return bean;
    }

}