java.net.ConnectException: Connection refused: connect

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What steps will reproduce the problem?
1. deploy hotswap.jar (1.0) and setup the build.xml for ANT (1.6.5)
2. connect to the target jvm_1 (1.6) on localhost, it works
3. connect to another remote jvm_2 (1.6) with Eclipse (3.4.2), it works
4. connect to the the remote jvm_2 (1.6) with hotswap, it doesn't work, and
produces a ConnectException: Connection refused error.

the ANT debug output shows the stacktrace as below
build.xml:339: java.net.ConnectException: Connection refused: connect
        at dak.ant.taskdefs.Hotswap.execute(Hotswap.java:221)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
        at org.apache.tools.ant.Task.perform(Task.java:364)
        at org.apache.tools.ant.Target.execute(Target.java:341)
        at org.apache.tools.ant.Target.performTasks(Target.java:369)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
        at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:
40)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
        at org.apache.tools.ant.Main.runBuild(Main.java:668)
        at org.apache.tools.ant.Main.startAnt(Main.java:187)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at
com.sun.tools.jdi.SocketTransportService.attach(SocketTransportService.java:204)
        at
com.sun.tools.jdi.GenericAttachingConnector.attach(GenericAttachingConnector.jav
a:98)
        at
com.sun.tools.jdi.SocketAttachingConnector.attach(SocketAttachingConnector.java:
72)
        at dak.debug.HotSwapHelper.connect(HotSwapHelper.java:83)
        at dak.debug.HotSwapHelper.connect(HotSwapHelper.java:36)
        at dak.ant.taskdefs.Hotswap.execute(Hotswap.java:193)
        ... 12 more
--- Nested Exception ---
java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at
com.sun.tools.jdi.SocketTransportService.attach(SocketTransportService.java:204)
        at
com.sun.tools.jdi.GenericAttachingConnector.attach(GenericAttachingConnector.jav
a:98)
        at
com.sun.tools.jdi.SocketAttachingConnector.attach(SocketAttachingConnector.java:
72)
        at dak.debug.HotSwapHelper.connect(HotSwapHelper.java:83)
        at dak.debug.HotSwapHelper.connect(HotSwapHelper.java:36)
        at dak.ant.taskdefs.Hotswap.execute(Hotswap.java:193)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
        at org.apache.tools.ant.Task.perform(Task.java:364)
        at org.apache.tools.ant.Target.execute(Target.java:341)
        at org.apache.tools.ant.Target.performTasks(Target.java:369)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
        at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:
40)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
        at org.apache.tools.ant.Main.runBuild(Main.java:668)
        at org.apache.tools.ant.Main.startAnt(Main.java:187)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Total time: 11 seconds



What is the expected output? What do you see instead?
hotswap should be able to connect to the remote JVM and hotswap classes there. 

What version of the product are you using? On what operating system?
hotswap-1.0.zip, on Windows (XP SP2/Vista SP1), JDK 1.6.0_13.

Please provide any additional information below.
I define the hotswap target as below:

  <taskdef name="hotswap" classname="dak.ant.taskdefs.Hotswap"/>


  <target name="hotswap">
    <path id="classpathForJavac"><!-- ... --></path>

    <echo message="Compiling: ${filter}.java"/>
    <!-- echo message="with classpath = ${toString:classpathForJavac}"/ -->

    <javac sourcepath="" srcdir="${product.src.dir};${pm.src.dir}"
destdir="${env.TMP}" debug="on" >
        <include name="**/${filter}.java"/>
        <classpath refid="classpathForJavac" />
    </javac>

    <echo message="Hotswapping: ${filter}.class"/>

    <hotswap verbose="true" host="${host}" port="1234">
        <fileset dir="${env.TMP}" includes="**/${filter}.class" />
    </hotswap>

    <echo message="hotswap done."/>
  </target>


and I'm invoking the ant target like this: 

ant hotswap -Dfilter=RequestWrapper -Dhost=10.0.0.105

Original issue reported on code.google.com by [e-mail] on 9 Apr 2009 at 5:05

[Google Code Exporter]

I think the current code always connect to localhost (the "host" input parameter
isn't used as far as I know), so you may try hotswap on a local JVM

Original comment by [e-mail] on 20 Nov 2009 at 11:52

[Google Code Exporter]

I'd the same problem, and check your java launch options:

-Xdebug -Xrunjdwp:transport=dt_socket,address=9000,server=y,suspend=n 

For example, in eclipse debug, it's launched like -Xdebug
-Xrunjdwp:transport=dt_socket,address=9000,server=n,suspend=y

You need server=y, for do hotswap.

Original comment by [e-mail] on 26 Nov 2009 at 10:09

[Google Code Exporter]

Hotswap does not close its debugger connection, so in Eclipse, after your 1st 
hotswap works, your 2nd will not - unless the containing Ant process ends.

I fixed this by changing my Ant task to run under an Execution Environment 
instead of "same JRE as the workspace".  Once the hotswap is done, the hotswap 
process dies and the client socket is closed, allowing the server socket to 
accept a new debug connection.

Original comment by [e-mail] on 31 Aug 2011 at 6:54

[Google Code Exporter]

The last problem reported is resolved adding the next code in HotSwapHelper 
class:

public void disconnect() throws Exception {
    // close the communication channel to the target VM
    vm.dispose();
}

Original comment by [e-mail] on 14 Mar 2012 at 3:47

[Google Code Exporter]

[deleted comment]

[Google Code Exporter]

The problem reported in Comment 1 ("the current code always connect to 
localhost") is solved by next steps:

(1) edit HotSwapHelper class and method:
     private void connect(String host, String port, String name)

(2) search the next lines:
     arg = (Connector.Argument)args.get("port");
        arg.setValue(port);

(3) before these lines, put:
     arg = (Connector.Argument)args.get("hostname");
        arg.setValue(host);

Original comment by [e-mail] on 14 Mar 2012 at 4:11

[Google Code Exporter]

[deleted comment]

[Google Code Exporter]

SSH -L <port>:<youhost>:<port> user@remoutehost

after this command try connect to localhost

must help.

Original comment by [e-mail] on 1 Feb 2015 at 1:46