AudioRead Function IN JAVA MultiThread Throw a Exception in Matlab2014B, but not in Matlab2014A

HI,Everyone:

     I am a new here. I have a question to ask u.

     I write a voice process program in Matlab language, And then I used MCC to compiler them into Jar package. I wirte some code in JAVA using this jar package, I Found that When I instantiate the Class that created by MCC in MultiThread, Eclipse Reported a Waring, the console log is following:

• Warning: The following error was caught while executing 'multimedia.internal.audio.file.PluginManager' class destructor:

Method 'delete' is not defined for class 'multimedia.internal.audio.file.PluginManager' or is removed from MATLAB's search path.

[> In audioread at 82

In EvaluateSample at 26]

      All the same Matlab and JAVA code, When I used Matlab2014a, Everything is OK. when I upgrade to Matlab2014b, the above problem coming. I hope some superior can help me to solve this problem.

      Thank u very much.