调试 JHipster 应用程序抛出：java.lang.ClassNotFoundException: org.h2.server.web.WebServlet

Posted 2023-02-25

【中文标题】调试 JHipster 应用程序抛出：java.lang.ClassNotFoundException: org.h2.server.web.WebServlet

【英文标题】：Debugging JHipster application throws: java.lang.ClassNotFoundException: org.h2.server.web.WebServlet

【发布时间】：2021-06-29 16:53:05

【问题描述】：

我使用 JHipster 7.0.0 生成了一个应用程序。它的 applicationType 为“monolith”，prodDatabaseType 为“postgressql”，devDatabaseType 为“h2Disk”。

当我运行命令行“./mwnw”时，应用程序完美启动。

当我尝试按照以下说明在 VSCode IDE 中调试应用程序时出现问题：https://www.jhipster.tech/development/。我右键单击Application类的文件（带有@SpringBootApplication注释的那个），单击“Debug Java”菜单，在启动过程中我得到了这个异常：

2021-04-02 18:51:36.143 DEBUG 46054 --- [           main] br.gov.mypackage.config.WebConfigurer       : Initialize H2 console
2021-04-02 18:51:36.145  WARN 46054 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is java.lang.RuntimeException: java.lang.RuntimeException: Failed to load and initialize org.h2.server.web.WebServlet
2021-04-02 18:51:36.251 ERROR 46054 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is java.lang.RuntimeException: java.lang.RuntimeException: Failed to load and initialize org.h2.server.web.WebServlet
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:769)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:326)
        at br.gov.ancine.JhipsterLearnApp.main(JhipsterLearnApp.java:69)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: Failed to load and initialize org.h2.server.web.WebServlet
        at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:257)
        at org.springframework.boot.web.embedded.undertow.UndertowServletWebServerFactory.createManager(UndertowServletWebServerFactory.java:345)
        at org.springframework.boot.web.embedded.undertow.UndertowServletWebServerFactory.getWebServer(UndertowServletWebServerFactory.java:314)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:159)
        ... 7 common frames omitted
Caused by: java.lang.RuntimeException: Failed to load and initialize org.h2.server.web.WebServlet
        at tech.jhipster.config.h2.H2ConfigurationHelper.initH2Console(H2ConfigurationHelper.java:128)
        at br.gov.ancine.config.WebConfigurer.initH2Console(WebConfigurer.java:119)
        at br.gov.ancine.config.WebConfigurer.onStartup(WebConfigurer.java:52)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.selfInitialize(ServletWebServerApplicationContext.java:234)
        at org.springframework.boot.web.embedded.undertow.UndertowServletWebServerFactory$Initializer.onStartup(UndertowServletWebServerFactory.java:504)
        at io.undertow.servlet.core.DeploymentManagerImpl$1.call(DeploymentManagerImpl.java:204)
        at io.undertow.servlet.core.DeploymentManagerImpl$1.call(DeploymentManagerImpl.java:187)
        at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:42)
        at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
        at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:255)
        ... 11 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.h2.server.web.WebServlet
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
        at java.base/java.lang.Class.forName0(Native Method)
        at java.base/java.lang.Class.forName(Class.java:398)
        at tech.jhipster.config.h2.H2ConfigurationHelper.initH2Console(H2ConfigurationHelper.java:119)
        ... 20 common frames omitted

看起来如果 VSCode 没有在类路径中包含 h2database。

【问题讨论】：

您是否在使用 VS Code 启动时激活了 dev 配置文件？

【参考方案1】：

答案如下：

在根应用程序文件夹中运行：

mvn spring-boot:run -D"spring-boot.run.jvmArguments"="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005"

https://***.com/a/68069089/1184154

在 vscode launch.json 运行：

“版本”：“0.2.0”， “配置”：[

  "type": "java",
  "name": "Debug (Launch)",
  "request": "launch",
  "mainClass": "",
  "args": ""
,

  "type": "java",
  "name": "Debug (Attach)",
  "request": "attach",
  "hostName": "localhost",
  "port": 8000

]

https://***.com/a/46841712/1184154