java.net.ConnectException: Connection refused: connect, status=0}
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Firewall might be blocking your connection, or MySQL it's not running on your server machine.
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Check if you have started your server, or if your server is set to listen to the port you're trying to connect and is waiting to accept connections and check if the firewall isn't blocking your connection.
java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.http.HttpClient.
(HttpClient.java:211) at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:996)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1300)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
at org.glassfish.jersey.client.HttpUrlConnector._apply(HttpUrlConnector.java:293)
at org.glassfish.jersey.client.HttpUrlConnector.apply(HttpUrlConnector.java:200)
at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:215)
at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:634)
at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:631)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:421)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:631)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:366)
at org.openstack4j.core.transport.internal.HttpExecutor.invoke(HttpExecutor.java:92)
at org.openstack4j.core.transport.internal.HttpExecutor.execute(HttpExecutor.java:52)
at org.openstack4j.core.transport.internal.HttpExecutor.execute(HttpExecutor.java:43)
at org.openstack4j.openstack.internal.BaseOpenStackService$Invocation.execute(BaseOpenStackService.java:136)
at org.openstack4j.openstack.internal.BaseOpenStackService$Invocation.execute(BaseOpenStackService.java:131)
at org.openstack4j.openstack.networking.internal.NetworkServiceImpl.list(NetworkServiceImpl.java:24)
at carey.jon.openstack4j.MainClass.main(MainClass.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)