Why does MATLAB 7.0 (R14) pass my data as NULL to a Java method?

MathWorks Support Team

2009 6 月 27

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I am using the MATLAB Java interface to pass data from MATLAB into a Java method I am calling. For example, I might try the following code:

data = rand(1,5000000);
myobject = MyClass;
myobject.myMethod(data)

However, for some data arrays, the call fails and MATLAB returns the following error:

ERROR: ??? Java exception occurred:
java.lang.NullPointerException
at MyClass.myMethod(MyClass.java:13)

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MathWorks Support Team 2023 年 2 月 20 日

編集済み: MathWorks Support Team 2023 年 4 月 16 日

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This bug has been fixed in Release 2006a (R2006a). For previous product releases, read below for any possible workarounds:

This error message occurs when there is not enough memory to convert the MATLAB data array into a Java data array and pass it to the Java method. To work around this issue, try increasing the heap space for the Java Virtual Machine by following the steps in the following document:

https://www.mathworks.com/matlabcentral/answers/92813-how-do-i-increase-the-heap-space-for-the-java-vm-in-matlab