Question

我建立了一个Websocket服务器，它应该运行一个由websocket servlet工厂创建的servlet。
但是，每当我尝试通过我最喜欢的浏览器访问websocket时，我都会

HTTP ERROR: 500

Problem accessing /test/sound. Reason:

    javax.servlet.ServletException: java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.server.WebSocketServerFactory

服务器控制台提供类似的错误。下面是完整的控制台错误消息：

    [13:21:26 WARN]: 2015-08-27 13:21:26.912:WARN:/test:qtp20972561-41: unavailable
java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.server.WebSocketSe
rverFactory
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at org.eclipse.jetty.websocket.servlet.WebSocketServletFactory$Loader.lo
ad(WebSocketServletFactory.java:63)
        at org.eclipse.jetty.websocket.servlet.WebSocketServletFactory$Loader.cr
eate(WebSocketServletFactory.java:42)
        at org.eclipse.jetty.websocket.servlet.WebSocketServlet.init(WebSocketSe
rvlet.java:128)
        at javax.servlet.GenericServlet.init(GenericServlet.java:244)
        at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.jav
a:612)
        at org.eclipse.jetty.servlet.ServletHolder.getServlet(ServletHolder.java
:468)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:778
)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java
:587)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandl
er.java:1125)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:
515)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandle
r.java:1059)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.j
ava:141)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper
.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:497)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.jav
a:248)
        at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java
:540)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPoo
l.java:620)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool
.java:540)
        at java.lang.Thread.run(Unknown Source)
[13:21:26 WARN]: 2015-08-27 13:21:26.913:WARN:oejs.ServletHandler:qtp20972561-41
:
javax.servlet.ServletException: java.lang.ClassNotFoundException: org.eclipse.je
tty.websocket.server.WebSocketServerFactory
        at org.eclipse.jetty.websocket.servlet.WebSocketServlet.init(WebSocketSe
rvlet.java:138)
        at javax.servlet.GenericServlet.init(GenericServlet.java:244)
        at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.jav
a:612)
        at org.eclipse.jetty.servlet.ServletHolder.getServlet(ServletHolder.java
:468)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:778
)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java
:587)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandl
er.java:1125)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:
515)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandle
r.java:1059)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.j
ava:141)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper
.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:497)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.jav
a:248)
        at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java
:540)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPoo
l.java:620)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool
.java:540)
        at java.lang.Thread.run(Unknown Source)
Caused by:
java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.server.WebSocketSe
rverFactory
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at org.eclipse.jetty.websocket.servlet.WebSocketServletFactory$Loader.lo
ad(WebSocketServletFactory.java:63)
        at org.eclipse.jetty.websocket.servlet.WebSocketServletFactory$Loader.cr
eate(WebSocketServletFactory.java:42)
        at org.eclipse.jetty.websocket.servlet.WebSocketServlet.init(WebSocketSe
rvlet.java:128)
        at javax.servlet.GenericServlet.init(GenericServlet.java:244)
        at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.jav
a:612)
        at org.eclipse.jetty.servlet.ServletHolder.getServlet(ServletHolder.java
:468)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:778
)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java
:587)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandl
er.java:1125)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:
515)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandle
r.java:1059)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.j
ava:141)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper
.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:497)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.jav
a:248)
        at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java
:540)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPoo
l.java:620)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool
.java:540)
        at java.lang.Thread.run(Unknown Source)

我最好的选择是，由于缺少WebSocketServletFactory类，我忘记了pom.xml中的内容，但我不确定。

以下是我在pom.xml中的存储库和依赖项

<repositories>
        <repository>
            <id>spigot-repo</id>
            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
        </repository>
        <repository>
            <id>googlecode</id>
            <name>jWebSocket Repository</name>
            <url>http://jwebsocket.googlecode.com/svn/repo</url>
        </repository>
    </repositories>
    <dependencies>
        <dependency>
            <groupId>org.spigotmc</groupId>
            <artifactId>spigot-api</artifactId>
            <version>1.8.8-R0.1-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-server</artifactId>
            <version>9.2.5.v20141112</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-servlet</artifactId>
            <version>9.2.5.v20141112</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty.websocket</groupId>
            <artifactId>websocket-server</artifactId>
            <version>9.2.5.v20141112</version>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
        </dependency>
    </dependencies>

如何解决此错误？如果需要更多来源，请提出要求。

Answer 1

我终于自己回答了我的问题。可以通过将类路径添加到META-INF / manifest.mf文件中缺少的jar来解决该问题。

也许我应该提到我试图通过bukkit插件在Minecraft服务器上运行jetty-server。现在工作正常。显然，这是将外部库添加到bukkit插件的正确方法。

感谢所有接听/评论的人。

Answer 2

注意：此答案假设您使用的是jetty-distribution和normal   webapps（WAR）文件。

您的war文件中WEB-INF/lib或者不应该有Jetty类   WEB-INF/classes，因此<scope>provided</scope>设置。

使用jetty-distribution 9.x，请务必在--module=websocket
中设置${jetty.base}/start.ini

如果您正在编写jetty本地websocket api，请使用此...

    <dependency>
        <groupId>org.eclipse.jetty.websocket</groupId>
        <artifactId>websocket-api</artifactId>
        <version>9.3.2.v20150730</version>
        <scope>provided</scope>
    </dependency>

如果您想要对jetty native websocket api进行servlet支持，请使用此...

    <dependency>
        <groupId>org.eclipse.jetty.websocket</groupId>
        <artifactId>websocket-servlet</artifactId>
        <version>9.3.2.v20150730</version>
        <scope>provided</scope>
    </dependency>

如果您希望客户端支持jetty native websocket api，请使用此...

    <dependency>
        <groupId>org.eclipse.jetty.websocket</groupId>
        <artifactId>websocket-client</artifactId>
        <version>9.3.2.v20150730</version>
        <scope>provided</scope>
    </dependency>

如果您是针对javax.websocket.server服务器API编写的，请使用以下命令（注意：这包括javax.websocket客户端API）...

    <dependency>
        <groupId>javax.websocket</groupId>
        <artifactId>javax.websocket-api</artifactId>
        <version>1.0</version>
        <scope>provided</scope>
    </dependency>

如果您是针对仅javax.websocket客户端API编写的，请使用以下内容...

    <dependency>
        <groupId>javax.websocket</groupId>
        <artifactId>javax.websocket-client-api</artifactId>
        <version>1.0</version>
        <scope>provided</scope>
    </dependency>

以下建议仅适用于嵌入式码头使用WebSocket和javax.websocket（JSR-356）支持。

如果您想要javax.websocket.server（又名JSR-356服务器）支持，请使用此...

    <dependency>
        <groupId>org.eclipse.jetty.websocket</groupId>
        <artifactId>javax-websocket-server-impl</artifactId>
        <version>9.3.2.v20150730</version>
        <scope>provided</scope>
    </dependency>

如果您想要javax.websocket（aja JSR-356客户端）支持使用此...

    <dependency>
        <groupId>org.eclipse.jetty.websocket</groupId>
        <artifactId>javax-websocket-client-impl</artifactId>
        <version>9.3.2.v20150730</version>
        <scope>provided</scope>
    </dependency>

你的pom中对websocket工件的其他引用是没用的，毫无意义，不能使用em。

ServletException：ClassNotFoundException org.eclipse.jetty.websocket.server.WebSocketServerFactory

2 个答案: