在 Tomcat 实例中找不到类，即使包含它的所有可能的工件都作为依赖项包含在内

Question

SEVERE: Servlet [com.mycompany.mycms.screport.services.CmsPortfolioConfig] in web application [] threw load() exception
java.lang.ClassNotFoundException: org.glassfish.jersey.servlet.ServletContainer
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1363)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1186)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:540)
at org.apache.catalina.core.DefaultInstanceManager$PrivilegedLoadClass.run(DefaultInstanceManager.java:835)
at org.apache.catalina.core.DefaultInstanceManager$PrivilegedLoadClass.run(DefaultInstanceManager.java:823)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:511)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1031)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:971)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4854)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5170)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:831)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:423)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:928)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:638)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:350)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:492)

我有一个Tomcat应用程序，它主要通过Jersey的JAX-RS实现提供RESTful api服务。 在启动的某个时刻，它决定抛出上述类未找到异常。最初，我从以下依赖项开始：

<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<version>${jersey.server.version}</version>
</dependency>

但它不在乎，给了我同样的堆栈痕迹。所以我放弃了，无奈地尝试了剩下的所有方法：

<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<version>${jersey.server.version}</version>
</dependency>

我完成了构建，并要求 Eclipse 将更改发布到 Tomcat 实例 (v9(。但是我得到了上面的堆栈跟踪。 我尝试添加此依赖项，因为 search.maven.org 报告它提供了缺少的类。

<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<version>${jersey.server.version}</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.bundles</groupId>
<artifactId>jaxrs-ri</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.connectors</groupId>
<artifactId>jersey-helidon-connector</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.ext</groupId>
<artifactId>jersey-wadl-doclet</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-server</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-jaxb</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-client</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.inject</groupId>
<artifactId>jersey-hk2</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-common</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.test-framework.maven</groupId>
<artifactId>custom-enforcer-rules</artifactId>
<version>2.31</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.examples</groupId>
<artifactId>xml-moxy</artifactId>
<version>2.31</version>
</dependency>

<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-client</artifactId>
<version>${jersey.server.version}</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.inject</groupId>
<artifactId>jersey-hk2</artifactId>
<version>${jersey.server.version}</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>${jersey.server.version}</version>
</dependency>

它仍然不在乎。 我以为它是在抱怨，因为它找不到班级。 如果我不提供它，我可以感激。 但是，我认为 maven 搜索工具中的 fc： 限定符允许我找到提供类的工件。 不知何故，这一切都是不正确的。

顺便说一下，我可以按 Ctrl-Shift-T，键入完全限定的类型并在 Eclipse 中看到它，甚至是源代码。 我不知道为什么它找不到那个类。

另外，我的服务都从 Tomcat 返回 404。 我想知道是因为这个错误还是其他原因。

https://search.maven.org/search?q=fc:org.glassfish.jersey.servlet.ServletContainer%20v:2.31

Answer 1

我建议，请检查项目中的部署程序集。您可以在 eclipse 中通过右键单击项目并转到属性来执行此操作。那里部署了所有东西吗？也许源文件中有所有类，但尚未部署。