Library compiler java package error
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I am trying to use the library compiler to generate a java package for matlab functions. And I select all the functions with an existing sample.
But I am facing the below error and no files are generated in xxxx/for_redistribution_files_only\samples.
com.mathworks.mvm.exec.MvmExecutionException: compiler.internal.ExampleParser.getArgumentValidation
at com.mathworks.mvm.exec.NativeFutureResult.nativeGet(Native Method)
at com.mathworks.mvm.exec.NativeFutureResult.get(NativeFutureResult.java:62)
at com.mathworks.mvm.exec.FutureResult.getInternal(FutureResult.java:413)
at com.mathworks.mvm.exec.FutureFevalResult.getInternal(FutureFevalResult.java:49)
at com.mathworks.mvm.exec.FutureResult.get(FutureResult.java:263)
at com.mathworks.toolbox.compiler_examples.generation.ExampleValidator.validateExample(ExampleValidator.java:41)
at com.mathworks.toolbox.compiler.plugin.PackageCommand$3.iterate(PackageCommand.java:416)
at com.mathworks.project.impl.plugin.XmlReaderImpl.loop(XmlReaderImpl.java:232)
at com.mathworks.toolbox.compiler.plugin.PackageCommand.packageSamples(PackageCommand.java:409)
at com.mathworks.toolbox.compiler.plugin.PackageCommand.execute(PackageCommand.java:676)
at com.mathworks.project.impl.engine.DeploymentEngine.executeScript(DeploymentEngine.java:373)
at com.mathworks.project.impl.engine.DeploymentEngine.access$000(DeploymentEngine.java:44)
at com.mathworks.project.impl.engine.DeploymentEngine$2.run(DeploymentEngine.java:289)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.mathworks.mvm.exec.MvmRuntimeException: Reference to a cleared variable this.
Error in ==> C:\Program Files\MATLAB\R2020b\toolbox\compiler_sdk\java\+compiler\+internal\ExampleParser.p>ExampleParser.getVariables at 0
Error in ==> C:\Program Files\MATLAB\R2020b\toolbox\compiler_sdk\java\+compiler\+internal\ExampleParser.p>ExampleParser.getArgumentValidation at 0
回答（1 个）
Kojiro Saito
2021-7-8
编辑：Kojiro Saito
2021-7-8
I can reproduce this issue if sample m script contains clear all.
Reproduction Step
addmatrix.m (to be compiled as Java package)
function out = addmatrix(in1, in2)
out = in1 + in2;
end
addmatrixWithClearSample2.m (sample m file which calls addmatrix)
clear all;
in1 = 0; % Initialize in1 here
in2 = 0; % Initialize in2 here
out = addmatrix(in1, in2);
Add addmatrixWithClearSample2.m from "Add Existing Sample" in Samples panel of Library Compiler window.
When packaging, we'll get "Caused by: com.mathworks.mvm.exec.MvmRuntimeException: Reference to a cleared variable this." error as you provided.
Solution
Remove or comment out "clear all" in your sample script. In the above example, addmatrixWithClearSample2.m should be the following.
addmatrixWithClearSample2.m
%clear all; % Comment out
in1 = 0; % Initialize in1 here
in2 = 0; % Initialize in2 here
out = addmatrix(in1, in2);
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