java - Jetty启动不加载WEB-INF/lib下的JAR

Question

Jetty启动不加载WEB-INF/lib下的JAR 直接使用java启动下面的main函数，发现Jetty没有到WEB-INF/lib下面的JAR。代码如下： {代码...} 错误日志： {代码...}

天蓬老师 · Answer

When starting up, use java -cp jetty.jar;WebContentWEB-INFclasses Launcher to start the project.

It can be seen from the error log that it is because the org.springframework.core.JdbcTemplate 这个类。而发生的问题的源码位于 classes following business code cannot be found.

So formed a:

AppClassloader(业务代码，依赖spring.jar)
      |
WebAppClssLoader(WEB-INF\lib\spring.jar)

Such a dependency structure, so when initializing the Spring container, initialize one AppCloassLoader中的类（依赖Spring）发现无法查询到JdbcTemplate这个Spring类。这是因为加载器的双亲委托机制.

Solution:

Specify all libs and jars when starting up
Or force it to be specified, do not use the classpath loaded by starting jetty Launcher: context.setParentLoaderPriority(false);
Use a packaged jetty launcher like start.jar to start. When starting, you still need to specify the specific classpath

package org.darkgem.jetty;

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.WebAppContext;

import java.io.File;
import java.io.FilenameFilter;

/**
 * 启动器
 */
public class Launcher {
    public static void main(String args[]) throws Exception {
        if (args.length == 0) {
            System.err.println("no web-app path");
            return;
        }
        String path = args[0];
        // 服务器的监听端口
        Server server = new Server(80);
        // 关联一个已经存在的上下文
        WebAppContext context = new WebAppContext();
        context.setDescriptor(path + "/WEB-INF/web.xml");
        // 设置Web内容上下文路径
        context.setResourceBase(path);
        // 设置上下文路径
        context.setContextPath("/admin/");
        context.setParentLoaderPriority(true);
        {
            StringBuilder sb = new StringBuilder();
            {
                sb.append(path);
                sb.append("/WEB-INF/classes");
                sb.append(";");
            }
            {
                File libDir = new File(path + "/WEB-INF/lib");
                if (libDir.exists() && libDir.isDirectory()) {
                    for (File jar : libDir.listFiles(new FilenameFilter() {
                        @Override
                        public boolean accept(File dir, String name) {
                            if (name.endsWith(".zip") || name.endsWith(".jar")) {
                                return true;
                            }
                            return false;
                        }
                    })) {
                        sb.append(jar.getAbsolutePath());
                        sb.append(";");
                    }
                }
            }
            System.out.println(sb.toString());
            context.setExtraClasspath(sb.toString());
        }
        //开启HTML，CSS，JS热部署
        context.setInitParameter("org.eclipse.jetty.servlet.Default.useFileMappedBuffer", "false");
        server.setHandler(context);
        // 启动
        server.start();
        server.join();
    }
}

PHP中文网 · Answer

Have you tried setting itcontext.setExtraClasspath(你的WEB-INF/lib)?

java - Jetty启动不加载WEB-INF/lib下的JAR

Jetty启动不加载WEB-INF/lib下的JAR

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