Here is the code:

(*Import data from a 2 MB Excel file*)

(*First increase memory for large Excel files*)

<< JLink`;


ReinstallJava[CommandLine -> "java", JVMArguments -> "-Xmx2048m"];

(*Now import the dataset*)


data = Import["dataset.xlsx"][[1]];


This code works fine in 10.3.1, but hangs in 10.4.0. Why???

  • 1
    $\begingroup$ Please provide an example Excel file that exhibits the problem. $\endgroup$
    – Szabolcs
    Mar 29, 2016 at 21:33
  • $\begingroup$ I have not been able to learn how to upload the Excel file. Any tips? $\endgroup$ Mar 30, 2016 at 0:05
  • 1
    $\begingroup$ @Michael Just upload it to any filehosting like sendspace.com . $\endgroup$ Mar 30, 2016 at 2:20
  • $\begingroup$ Thanks for the tip. I just uploaded the example Excel file to sendspace.com. The file is named dataset.xlxs, and the description is "Michael for MMA Stack Exchange." $\endgroup$ Mar 30, 2016 at 5:25
  • 2
    $\begingroup$ @Michael You should publish here the URL you got after uploading the file, not the file name. $\endgroup$ Mar 30, 2016 at 6:13

1 Answer 1


From Wolfram support: the reason 10.4.0 cannot import the excel file: the command ReinstallJava[CommandLine -> "java", JVMArguments -> "-Xmx2048m"]; is incorrect for 10.4.0. The correct command is: ReinstallJava[JVMArguments -> "-Xmx2048m"];.


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