Calling matlab function from java several times

Question

Gilad Book 2018-6-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/405236-calling-matlab-function-from-java-several-times

编辑： Gilad Book 2018-6-17

We are calling MatLab methods from a Java Web-service using two different jar files that each load the MatLab runtime libraries. This causes the Java Virtual Machine to load the libraries twice. The result is the following error the second time the MatLab libraries are loaded.

Exception in thread "Thread-55" java.lang.UnsatisfiedLinkError: Native Library C:\Program Files\MATLAB\MATLAB Runtime\v92\bin\win64\BuilderJABootstrap.dll already loaded in another classloader
  at java.lang.ClassLoader.loadLibrary0(Unknown Source)
  at java.lang.ClassLoader.loadLibrary(Unknown Source)
  at java.lang.Runtime.load0(Unknown Source)
  at java.lang.System.load(Unknown Source)
  at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1699)
  at com.mathworks.toolbox.javabuilder.MWUtil.GetUnknownClassID(MWUtil.java:727)
  at com.mathworks.toolbox.javabuilder.MWClassID.<clinit>(MWClassID.java:43)
  at com.mathworks.toolbox.javabuilder.MWCharArray.<init>(MWCharArray.java:81)
  at com.simfinit.SimServiceReport.SimServiceReportThread.exportReport(SimServiceReportThread.java:255)
  at com.simfinit.SimServiceReport.SimServiceReportThread.threadDriverReport(SimServiceReportThread.java:188)

We have tried putting an instantiation of the MWCharArray class into a static Java class to pre-load the libraries before calling methods in the MatLab jar file, but this did not avoid the problem. We have also considered putting both Matlab applications into a single jar file, or to unload the MatLab dlls after each use. If there is a known solution to this issue, we would appreciate some advice.