我正在使用安装了Java EE Base 1.31.1和EJB和EAR 1.27.1插件的Netbeans 8.2。 我安装了Tomcat 9.0.4，并将其作为服务器添加到Netbeans中。 Netbeans 可以成功启动 tomcat 服务器并启动我的 Web 应用程序，但它不会调试。 当我尝试调试我的 Web 应用程序时，我的 Web 应用程序日志中出现以下错误：
ant -f /Users/jryan/JDev/SVN/trunk/Java/CollaborationServer -Dnb.internal.action.name=debug -Ddirectory.deployment.supported=true -DforceRedeploy=false -Dnb.wait.for.caches=true -Dbrowser.context=/Users/jryan/JDev/SVN/trunk/Java/CollaborationServer debug
init:
deps-module-jar:
deps-ear-jar:
deps-jar:
library-inclusion-in-archive:
library-inclusion-in-manifest:
compile:
compile-jsps:
debug:
Stopping Tomcat process...
Waiting for Tomcat...
Tomcat server stopped.
Starting Tomcat process...
Waiting for Tomcat...
Tomcat server started.
connect-debugger:
/Users/jryan/JDev/SVN/trunk/Java/CollaborationServer/nbproject/build-impl.xml:1206: The following error occurred while executing this line:
/Users/jryan/JDev/SVN/trunk/Java/CollaborationServer/nbproject/build-impl.xml:1216:
org.netbeans.api.debugger.jpda.DebuggerStartException: Connection refused (Connection refused)
at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.waitRunning(JPDADebuggerImpl.java:405)
at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.waitRunning(JPDADebuggerImpl.java:387)
at org.netbeans.api.debugger.jpda.JPDADebugger.attach(JPDADebugger.java:324)
at org.netbeans.modules.debugger.jpda.ant.JPDAConnect$1.run(JPDAConnect.java:235)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at com.sun.tools.jdi.SocketTransportService.attach(SocketTransportService.java:222)
at com.sun.tools.jdi.GenericAttachingConnector.attach(GenericAttachingConnector.java:116)
at com.sun.tools.jdi.SocketAttachingConnector.attach(SocketAttachingConnector.java:90)
at org.netbeans.api.debugger.jpda.AttachingDICookie.getVirtualMachine(AttachingDICookie.java:231)
at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.doStartDebugger(StartActionProvider.java:188)
at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.access$200(StartActionProvider.java:80)
at org.netbeans.modules.debugger.jpda.actions.StartActionProvider$1.run(StartActionProvider.java:165)
... 4 more
BUILD FAILED (total time: 7 seconds)
雄猫日志说Listening for transport dt_socket at address: 8000
Netbeans 调试器控制台说：
Attaching to localhost:8000
Connection refused.
有谁知道这里发生了什么，以及我能做些什么来解决这个问题？
谢谢！
也许尝试添加本答案中详述的标志。
这就是我们目前的做法。
> 哎呀。 事实证明，我已经注释掉了/etc/hosts 文件中的127.0.0.1 localhost条目。 当我重新启用本地主机时，它工作正常！ 顺便说一句，我认为我必须注释掉默认的 localhost 行，因为我正在测试的本地托管站点还有另一行，但根据这个答案，没有必要这样做！