"Error using connector.ensureServiceOn" when clicking "Get Add-Ons"

Question

Esther 2015-11-30

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/258174-error-using-connector-ensureserviceon-when-clicking-get-add-ons

评论： MUTHUKUMARASAMY V 2020-12-31

采纳的回答： Dave Behera

在 MATLAB Online 中打开

Asking this question in case anyone else has faced the same problem / has found a solution.

Release: R2015b 64 bit, Windows.

When clicking on "Get Add-Ons", this error message pops up on the command window:

Error using connector.ensureServiceOn
Error starting MATLAB Connector. Please check that port 31515 is available. 
com.mathworks.jmi.MatlabException: Error starting MATLAB Connector. Please check that port 31515 is available.
  at com.mathworks.jmi.NativeMatlab.SendMatlabMessage(Native Method)
  at com.mathworks.jmi.NativeMatlab.sendMatlabMessage(NativeMatlab.java:266)
  at com.mathworks.jmi.MatlabLooper.sendMatlabMessage(MatlabLooper.java:120)
  at com.mathworks.jmi.Matlab.mtFevalConsoleOutput(Matlab.java:1778)
  at com.mathworks.jmi.MatlabWorker.feval(MatlabWorker.java:195)
  at com.mathworks.jmi.MatlabWorker.feval(MatlabWorker.java:172)
  at com.mathworks.addons.ConnectorFactory$1.runOnMatlabThread(ConnectorFactory.java:37)
  at com.mathworks.jmi.MatlabWorker$2.run(MatlabWorker.java:79)
  at com.mathworks.jmi.NativeMatlab.dispatchMTRequests(NativeMatlab.java:475)

What I've tried:

Allowed R2015b.exe in the Firewall for inbound and outbound connections.
Allowed TCP port 31515 in the Firewall for inbound and outbound connections.

Still no luck.

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Answer 1

Dave Behera 2015-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/258174-error-using-connector-ensureserviceon-when-clicking-get-add-ons#answer_202248

Hi,

The issue is related to the network configuration. One possible workaround is forcing JVM to use IPv4 over IPv6 by setting the java.net.preferIPv4Stack config. The following discussion page provides some relevant discussion:

http://stackoverflow.com/questions/8216713/java-net-socketexception-invalid-argument-connect%3E

To work around this issue create a new System Variable named JAVA_TOOL_OPTION, with the value -Djava.net.preferIPv4Stack=true

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Dominik Melcher 2016-9-14

I solved the problem by deleting the MATLAB_JAVA path in my system variables.

naveen kumar 2018-7-8

I deleted the MATLAB_JAVA variable.Yet no luck.

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Answer 2

AFTAB ALAM ANSARI 2017-11-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/258174-error-using-connector-ensureserviceon-when-clicking-get-add-ons#answer_292575

Don't go for rubbish like "it's because of JAVA". This happens when MATLAB is blocked by some firewall that is blocking MATLAB from connecting to Internet. MATLAB uses Internet during Stimulation. Just exclude it from firewall and there you go. There will be no error.