IntelliJ配置GlassFish服务器遇java.lang.ClassNotFoundException问题求助

问题核心分析 #

这个错误的本质是GlassFish的Web应用类加载器找不到编译后的Test.class文件——Web容器默认只会从WEB-INF/classes目录加载应用类，而你的项目当前的编译输出配置大概率没把class文件放到这个指定位置。结合你提供的项目结构和配置，我整理了几个关键的排查和修复步骤：

1. 修正IntelliJ的编译输出路径配置 #

这是最常见的诱因，默认情况下IntelliJ会把编译后的class文件放到out目录，而非Web应用要求的WEB-INF/classes：

• 打开 File → Project Structure → Modules，选中你的Test3模块
• 切换到Paths标签页
• 将Output path和Test output path都修改为：$MODULE_DIR$/web/WEB-INF/classes
• 点击Apply后，执行 Build → Rebuild Project，确保编译后的class文件生成到正确目录

2. 验证项目文件结构的规范性 #

确保你的源码目录和Web目录结构符合Java Web规范：

Test3/
├── src/                # 需标记为Sources Root（IntelliJ中显示为蓝色文件夹）
│   └── test/
│       └── Test.java   # 对应代码中的package test;
├── web/                # 需标记为Web Root（IntelliJ中显示为蓝色带地球图标）
│   ├── WEB-INF/
│   │   ├── web.xml
│   │   └── classes/    # 编译后的class文件会在这里，最终应有test/Test.class
│   └── ...
└── Test3.iml

如果src未被标记为Sources Root，右键点击src文件夹 → Mark Directory as → Sources Root即可。

3. 检查GlassFish的部署配置 #

确保你部署的是正确的Artifact，而非直接部署文件夹：

• 打开 Run/Debug Configurations，选中你的GlassFish服务器配置
• 切换到Deployment标签页
• 如果当前部署的是文件夹，点击+ → Artifact，选择项目对应的Web Application: Exploded Artifact
• 若没有Artifact，先去Project Structure → Artifacts，创建一个Web Application: Exploded类型的Artifact，指向你的web目录，并确保包含编译后的classes目录

4. 清理缓存并重新部署 #

缓存异常也可能导致这类问题，执行以下步骤彻底清理：

• 清理GlassFish应用缓存：找到GlassFish安装目录下的domains/domain1/applications，删除你的项目文件夹
• 清理IntelliJ缓存：File → Invalidate Caches...，选择Invalidate and Restart
• 重新编译并部署项目

修复验证 #

部署完成后，检查Test3/web/WEB-INF/classes/test/目录下是否存在Test.class文件。如果存在，访问http://localhost:8080/你的项目上下文路径/test，应该能看到预期输出Bla bla bla。

附：你提供的代码与配置（供参考） #

Test.java

package test;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class Test extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("Bla bla bla");
        resp.getWriter().close();
    }
}

web.xml

<?xml version='1.0' encoding='UTF-8'?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">
    <servlet>
        <servlet-name>test</servlet-name>
        <servlet-class>test.Test</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>test</servlet-name>
        <url-pattern>/test</url-pattern>
    </servlet-mapping>
</web-app>

Test3.iml

<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
    <component name="FacetManager">
        <facet type="web" name="Web">
            <configuration>
                <webroots>
                    <root url="file://$MODULE_DIR$/web" relative="/" />
                </webroots>
            </configuration>
        </facet>
    </component>
    <component name="NewModuleRootManager" inherit-compiler-output="true">
        <exclude-output />
        <content url="file://$MODULE_DIR$">
            <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
        </content>
        <orderEntry type="inheritedJdk" />
        <orderEntry type="sourceFolder" forTests="false" />
        <orderEntry type="library" scope="PROVIDED" name="GlassFish 5.0.0 - RESTful Web Service" level="application_server_libraries" />
        <orderEntry type="library" scope="PROVIDED" name="GlassFish 5.0.0" level="application_server_libraries" />
    </component>
</module>

完整堆栈跟踪

[2018-01-13T14:02:18.469+0100] [glassfish 5.0] [WARNING] [] [javax.enterprise.system.container.web.com.sun.web.security] [tid: _ThreadID=36 _ThreadName=http-listener-1(5)] [timeMillis: 1515848538469] [levelValue: 900] [[ Context path from ServletContext: differs from path from bundle: /]]
WebModule[]Error loading WebappClassLoader (delegate=true; repositories=WEB-INF/classes/) test.Test
java.lang.ClassNotFoundException: test.Test
    at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1621)
    at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1471)
    at org.apache.catalina.core.StandardWrapper.loadServletClass(StandardWrapper.java:1431)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1297)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1109)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:177)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:652)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:591)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:371)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:463)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:168)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:242)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:539)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573)
    at java.lang.Thread.run(Thread.java:745)
]]
[2018-01-13T14:02:18.480+0100] [glassfish 5.0] [WARNING] [] [javax.enterprise.web] [tid: _ThreadID=36 _ThreadName=http-listener-1(5)] [timeMillis: 1515848538480] [levelValue: 900] [[ StandardWrapperValve[test]: Allocate exception for servlet test
java.lang.ClassNotFoundException: test.Test
    at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1621)
    at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1471)
    at org.apache.catalina.core.StandardWrapper.loadServletClass(StandardWrapper.java:1431)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1297)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1109)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:177)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:652)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:591)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:371)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:463)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:168)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:242)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:539)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573)
    at java.lang.Thread.run(Thread.java:745)
]]

内容的提问来源于stack exchange，提问作者Grisungen