使用 maven tomcat 和 eclipse 进行远程调试
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remote debugging with maven tomcat and eclipse
提问by TPPZ
The same "old question", I am pretty new to Maven and I can not figure out why in the end I am getting a message like "Failed to connect to remote VM. Connection refused." from Eclipse.
同样的“老问题”，我对 Maven 还很陌生，我不明白为什么最后我会收到“无法连接到远程 VM。连接被拒绝”这样的消息。来自日食。
Maven options (I've set this environment variable on my ~/.profile~/.bashrcetc.)
Maven 选项（我已经在我的~/.profile~/.bashrc等设备上设置了这个环境变量）
$ echo $MAVEN_OPTS
-Xmx1024m -Xms256m -XX:MaxPermSize=256m -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
On Eclipse I've set a Debug profile on a Remote Java Applicationbased on the project I want to debug, with host 127.0.0.1(not localhostbecause the Maven profile devI am using, see below, is explicitly setting that IP address) and port 8000.
在 Eclipse 上，我Remote Java Application根据我要调试的项目设置了一个调试配置文件，使用主机127.0.0.1（不是localhost因为dev我使用的 Maven 配置文件，见下文，明确设置了该 IP 地址）和端口8000。
Then when I run the application from the command line with the following command (maven is picking a devprofile from the pom file):
然后，当我使用以下命令从命令行运行应用程序时（maven 正在dev从 pom 文件中选择一个配置文件）：
$ mvn tomcat:run -P dev
and I start Eclipse in debug mode on the Eclipse Remote Java Application profile I previously set I am getting a message from an Eclipse popup window saying:
我在之前设置的 Eclipse 远程 Java 应用程序配置文件上以调试模式启动 Eclipse 我从 Eclipse 弹出窗口收到一条消息：
Failed to connect to remote VM. Connection refused.
Connection refused
I suspect the settings from the $MAVEN_OPTSare not pick up from some reason, have a look at the following output from the pscommand:
我怀疑由于$MAVEN_OPTS某种原因没有启动设置，请查看ps命令的以下输出：
USER_NAME@my-laptop $ ps aux | grep tomcat
USER_NAME 16526 11.3 13.7 3014276 500680 pts/5 Sl+ 11:25 0:29 /usr/lib/jvm/java-7-openjdk-amd64/bin/java -classpath /usr/share/maven/boot/plexus-classworlds-2.x.jar -Dclassworlds.conf=/usr/share/maven/bin/m2.conf -Dmaven.home=/usr/share/maven org.codehaus.plexus.classworlds.launcher.Launcher tomcat:run -P dev
More details:
更多细节：
- java version "1.7.0_25"
- OpenJDK Runtime Environment (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.13.04.2)
- OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)
- Eclipse Kepler
- java版本“1.7.0_25”
- OpenJDK 运行时环境 (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.13.04.2)
- OpenJDK 64 位服务器 VM（构建 23.7-b01，混合模式）
- 日食开普勒
Please shed some light, thanks and again... Apologies for the dummy question.
请阐明，再次感谢... 为这个虚拟问题道歉。
回答by Richard Neish
The docs for tomcat:rundescribe the systemProperties value that you can put in the pom.xml file.
tomcat:run的文档描述了可以放入 pom.xml 文件的 systemProperties 值。
The settings that you have above would look like this in your pom.xml:
你上面的设置在你的 pom.xml 中看起来像这样：
<project>
...
<build>
...
<plugins>
...
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>tomcat-maven-plugin</artifactId>
<version>1.2-SNAPSHOT</version>
<configuration>
<systemProperties>
<JAVA_OPTS>-Xmx1024m -Xms256m -XX:MaxPermSize=256m -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000</JAVA_OPTS>
</systemProperties>
</configuration>
Also, see this answer.
另外，请参阅此答案。
回答by Pieter
It looks like you are missing a parameter, try adding -Xdebugto your MAVEN_OPTS
看起来您缺少一个参数，请尝试添加-Xdebug到您的 MAVEN_OPTS
