MATLAB: MCR using custom Java archives (jar)

javajavaclasspathMATLAB Compilermcr

I am trying to use deploytool to deploy an application with custom built java jar archives. The issue is that we include a bunch of jar files, and some of the jar files contain classes which override other jar files depending on the classpath order. For deploytool, is there anyway to include the jar files in the "Shared Resources and Helper Files" area but allow the correct ordering of the includes? Should I even be including the jar files in this area? I have the javaclasspath set before i run the deploytool build command, but it doesnt seem to use this list to control load order. I am currently using Matlab R2010b on Linux.

Best Answer

I don't have personal experience with this, but according to this solution, you need to modify the javaclasspath in the compiled application using the JAVAADDPATH command.

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MATLAB: Create a Java Package with MATLAB Code Error

This is due to file access permissions. In my case, I got the following error.

C:\Program Files\makesqr\application>javac -classpath "C:\MATLAB\MATLAB_Runtime\v94\toolbox\javabuilder\jar\javabuilder.jar";.\makesqr.jar .\getmagic.java
.\getmagic.java:4: error: error while writing getmagic: .\getmagic.class (Access is denied)
class getmagic
^
1 error

javac tries to create getmagic.class file, but normal users do not have a permission to write a file under C:\Program Files.

I think there are two options.

Launch command prompt as Administrator, then execute the javac command.
Install makesqr package in another folder where normal users have a permission to write

MATLAB: Does the compiled application not locate a MATLAB built-in Java class with MATLAB Compiler 4.0 (R14)

MATLAB Compiler uses the dynamic class path to reference JAR files used by any toolbox functions used in your application. This is because the MATLAB Compiler Runtime (MCR) only includes the base MATLAB functions, so JAR-files associated with individual toolboxes are packaged in the CTF-file. When executing the application in MATLAB, these JAR-files are on the static Java classpath, while in compiled applications they are on the dynamic classpath.

If your application needs to modify the Java classpath, you should retain any entries in the existing classpath and add the new paths. You can do this using the JAVAADDPATH function. For example:

javaaddpath('/usr/oracle/jdbc/classes12.jar')

This will prepend the directory to the dynamic classpath, leaving intact any JAR-files automatically added to the dynamic path by MATLAB Compiler.

For more information on JAVAADDPATH execute the following command at the MATLAB command prompt

doc javaaddpath

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MATLAB: Create a Java Package with MATLAB Code Error

MATLAB: Does the compiled application not locate a MATLAB built-in Java class with MATLAB Compiler 4.0 (R14)

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