Thank you for your suggestions :).
I did:
cd $AXIS2_HOME/samples/transport/https-sample/httpsClient
mvn package exec:java
-Dexec.mainClass="org.apache.axis2.examples.httpsclient.SimpleServiceClient"
-Dexec.classpathScope=runtime -Dexec.cleanupDaemonThreads=false


Output is:
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl sendViaPost
INFO: Unable to sendViaPost to url[
https://localhost:8443/services/SimpleService/]
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 sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:666)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:140)
at
org.apache.commons.httpclient.protocol.SSLProtocolSocketFactory.createSocket(SSLProtocolSocketFactory.java:130)
at
org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
at
org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
at
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
at
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
at
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl.executeMethod(HTTPSenderImpl.java:872)
at
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl.sendViaPost(HTTPSenderImpl.java:212)
at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:121)
at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:403)
at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:234)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:431)
at
org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:399)
at
org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:225)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:150)
at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:533)
at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:509)
at
org.apache.axis2.examples.httpsclient.SimpleServiceClient.main(SimpleServiceClient.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:282)
at java.lang.Thread.run(Thread.java:748)

[WARNING]
org.apache.axis2.AxisFault: Connection refused (Connection refused)
    at org.apache.axis2.AxisFault.makeFault (AxisFault.java:430)
    at
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl.sendViaPost
(HTTPSenderImpl.java:216)
    at org.apache.axis2.transport.http.HTTPSender.send (HTTPSender.java:121)
    at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons
(CommonsHTTPTransportSender.java:403)
    at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke
(CommonsHTTPTransportSender.java:234)
    at org.apache.axis2.engine.AxisEngine.send (AxisEngine.java:431)
    at org.apache.axis2.description.OutInAxisOperationClient.send
(OutInAxisOperation.java:399)
    at org.apache.axis2.description.OutInAxisOperationClient.executeImpl
(OutInAxisOperation.java:225)
    at org.apache.axis2.client.OperationClient.execute
(OperationClient.java:150)
    at org.apache.axis2.client.ServiceClient.sendReceive
(ServiceClient.java:533)
    at org.apache.axis2.client.ServiceClient.sendReceive
(ServiceClient.java:509)
    at org.apache.axis2.examples.httpsclient.SimpleServiceClient.main
(SimpleServiceClient.java:45)
    at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:282)
    at java.lang.Thread.run (Thread.java:748)
Caused by: java.net.ConnectException: Connection refused (Connection
refused)
    at java.net.PlainSocketImpl.socketConnect (Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect
(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress
(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect
(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect (SocksSocketImpl.java:392)
    at java.net.Socket.connect (Socket.java:589)
    at sun.security.ssl.SSLSocketImpl.connect (SSLSocketImpl.java:666)
    at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at
org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket
(ReflectionSocketFactory.java:140)
    at
org.apache.commons.httpclient.protocol.SSLProtocolSocketFactory.createSocket
(SSLProtocolSocketFactory.java:130)
    at org.apache.commons.httpclient.HttpConnection.open
(HttpConnection.java:707)
    at
org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open
(MultiThreadedHttpConnectionManager.java:1361)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry
(HttpMethodDirector.java:387)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod
(HttpMethodDirector.java:171)
    at org.apache.commons.httpclient.HttpClient.executeMethod
(HttpClient.java:397)
    at
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl.executeMethod
(HTTPSenderImpl.java:872)
    at
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl.sendViaPost
(HTTPSenderImpl.java:212)
    at org.apache.axis2.transport.http.HTTPSender.send (HTTPSender.java:121)
    at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons
(CommonsHTTPTransportSender.java:403)
    at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke
(CommonsHTTPTransportSender.java:234)
    at org.apache.axis2.engine.AxisEngine.send (AxisEngine.java:431)
    at org.apache.axis2.description.OutInAxisOperationClient.send
(OutInAxisOperation.java:399)
    at org.apache.axis2.description.OutInAxisOperationClient.executeImpl
(OutInAxisOperation.java:225)
    at org.apache.axis2.client.OperationClient.execute
(OperationClient.java:150)
    at org.apache.axis2.client.ServiceClient.sendReceive
(ServiceClient.java:533)
    at org.apache.axis2.client.ServiceClient.sendReceive
(ServiceClient.java:509)
    at org.apache.axis2.examples.httpsclient.SimpleServiceClient.main
(SimpleServiceClient.java:45)
    at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:282)
    at java.lang.Thread.run (Thread.java:748)
[INFO]
------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO]
------------------------------------------------------------------------
[INFO] Total time:  6.148 s
[INFO] Finished at: 2019-12-21T07:45:39-05:00
[INFO]
------------------------------------------------------------------------
[ERROR] Failed to execute goal
org.codehaus.mojo:exec-maven-plugin:1.6.0:java (default-cli) on project
httpsClient: An exception occured while executing the Java class.
Connection refused (Connection refused) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions,
please read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/ConnectException


On Wed, Dec 18, 2019 at 6:53 PM robertlazarski . <robertlazar...@gmail.com>
wrote:

> Looks like a 15 second timeout , try passing this to maven:
>
> -Dexec.cleanupDaemonThreads=false
>
> On Fri, Dec 13, 2019 at 12:49 PM albert kao <albertk...@gmail.com> wrote:
> >
> > I am following samples/transport/https-sample/README.txt.
> >
> > Running the Sample Client get the expected result.
> >
> > However, how to fix the following WARNING?
> > org.apache.axis2.deployment.AxisConfigBuilder processDeployers
> > WARNING: Unable to instantiate deployer
> org.apache.axis2.deployment.ServiceDeployer; see debug logs for more details
> > <ns:helloServiceResponse xmlns:ns="
> http://httpsservice.examples.axis2.apache.org";><ns:return>Hello World
> </ns:return></ns:helloServiceResponse>[WARNING] thread
> Thread[MultiThreadedHttpConnectionManager
> cleanup,5,org.apache.axis2.examples.httpsclient.SimpleServiceClient] was
> interrupted but is still alive after waiting at least 14999msecs
> > [WARNING] thread Thread[MultiThreadedHttpConnectionManager
> cleanup,5,org.apache.axis2.examples.httpsclient.SimpleServiceClient] will
> linger despite being asked to die via interruption
> > [WARNING] NOTE: 1 thread(s) did not finish despite being asked to  via
> interruption. This is not a problem with exec:java, it is a problem with
> the running code. Although not serious, it should be remedied.
> > [WARNING] Couldn't destroy threadgroup
> org.codehaus.mojo.exec.ExecJavaMojo$IsolatedThreadGroup[name=org.apache.axis2.examples.httpsclient.SimpleServiceClient,maxpri=10]
> > java.lang.IllegalThreadStateException
> >     at java.lang.ThreadGroup.destroy (ThreadGroup.java:778)
> >     at org.codehaus.mojo.exec.ExecJavaMojo.execute
> (ExecJavaMojo.java:321)
> >     at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
> (DefaultBuildPluginManager.java:137)
> >     at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:210)
> >     at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:156)
> >     at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:148)
> >     at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:117)
> >     at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:81)
> >     at
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
> (SingleThreadedBuilder.java:56)
> >     at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
> (LifecycleStarter.java:128)
> >     at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
> >     at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
> >     at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
> >     at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
> >     at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
> >     at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
> >     at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
> >     at sun.reflect.NativeMethodAccessorImpl.invoke
> (NativeMethodAccessorImpl.java:62)
> >     at sun.reflect.DelegatingMethodAccessorImpl.invoke
> (DelegatingMethodAccessorImpl.java:43)
> >     at java.lang.reflect.Method.invoke (Method.java:498)
> >     at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
> (Launcher.java:289)
> >     at org.codehaus.plexus.classworlds.launcher.Launcher.launch
> (Launcher.java:229)
> >     at
> org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
> (Launcher.java:415)
> >     at org.codehaus.plexus.classworlds.launcher.Launcher.main
> (Launcher.java:356)
> >
>
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