Java 传输 dt_socket 8787 已在使用
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Transport dt_socket 8787 already in use
提问by Gaurav Agarwal
I am trying to run a Server and Client application in Jetty server on my Ubuntu 12.04 machine. The server starts without any problem and I used the following command
我正在尝试在我的 Ubuntu 12.04 机器上的 Jetty 服务器中运行服务器和客户端应用程序。服务器启动没有任何问题，我使用了以下命令
$ mvn jetty:run
$ mvn码头：运行
on issuing this command the first line was
发出此命令时，第一行是
Listening for transport dt_socket at address: 8787
在地址侦听传输 dt_socket：8787
But when I launched the client I got the following error
但是当我启动客户端时出现以下错误
ERROR: transport error 202: bind failed: Address already in use
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [../../../src/share/back/debugInit.c:690]
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
Aborted
Looks something to do with transport dt_socket. I have no understanding what it is and how to use another address for Client?
看起来与传输 dt_socket 有关。我不明白它是什么以及如何为客户端使用另一个地址？
Edit 1
编辑 1
jetty-maven-plugin from pom.xml for client looks like this
来自 pom.xml 的 jetty-maven-plugin for client 看起来像这样
<build>
<plugins>
<!-- Specific jetty-maven-plugin configuration for running Jetty during
development. None of its goals are run in a normal build lifecycle. -->
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>${jetty-maven-plugin.version}</version>
<configuration>
<webAppConfig>
<contextPath>/</contextPath>
<extraClasspath>${basedir}/src/test/resources/</extraClasspath>
</webAppConfig>
<connectors>
<connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">
<port>${servlet.port}</port>
<host>0.0.0.0</host>
</connector>
</connectors>
<reload>manual</reload>
<useTestClasspath>true</useTestClasspath>
</configuration>
</plugin>
</plugins>
</build>
My assumption is some Jetty is starting in debug mode and trying to attach the debugger at port 8787 which is already bound to debugger of Server.
我的假设是某些 Jetty 正在以调试模式启动并尝试在端口 8787 上附加调试器，该端口已绑定到服务器的调试器。
采纳答案by Gaurav Agarwal
Jetty does NOT automatically starts the debugger. You most likely have set the MAVEN_OPTS environment variable to include -Xdebug parameters. Check with 'echo $MAVEN_OPTS' and you will see something like:
Jetty 不会自动启动调试器。您很可能已将 MAVEN_OPTS 环境变量设置为包含 -Xdebug 参数。检查'echo $MAVEN_OPTS'，你会看到类似的东西：
-Xdebug -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n
You can't run two maven processes which both try to debug on port 8787. So change your global MAVEN_OPTS (in .bash_profile when running on osx) or change your MAVEN_OPTS for your second terminal session:
您不能运行两个都尝试在端口 8787 上调试的 maven 进程。因此，更改您的全局 MAVEN_OPTS（在 osx 上运行时在 .bash_profile 中）或更改您的第二个终端会话的 MAVEN_OPTS：
export MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=512M"
回答by Petr Mensik
Try this configuration inside jetty plugin
在jetty插件中试试这个配置
<configuration>
<connectors>
<connector implementation="org.mortbay.jetty.nio.SelectChannelConnector">
<port>9090</port>
</connector>
</connectors>
</configuration>
Or alternatively, run jettyfrom command line this way
或者，以jetty这种方式从命令行运行
mvn -Djetty.port=9090 jetty:run
回答by Ashokchakravarthi Nagarajan
Enter the below command in terminal / command prompt
在终端/命令提示符中输入以下命令
killall -9 java
killall -9 java
It will kill all the java processes. You will be able to use the port then.
它会杀死所有的java进程。然后您将能够使用该端口。
