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compiler.build.javaPackage

Create Java package for deployment outside MATLAB

Description

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compiler.build.javaPackage(Files) creates a Java® package using the MATLAB® functions specified by Files. Before creating Java packages, see Configure Your Java Environment.

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compiler.build.javaPackage(Files,Name,Value) creates a Java package with additional options specified using one or more name-value arguments. Options include the class name, output directory, and additional files to include.

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compiler.build.javaPackage(ClassMap) creates a Java package with a class mapping specified using a container.Map object ClassMap.

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compiler.build.javaPackage(ClassMap,Name,Value) creates a Java package using ClassMap and additional options specified using one or more name-value arguments. Options include the package name, output directory, and additional files to include.

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compiler.build.javaPackage(opts) creates a Java package with options specified using a compiler.build.JavaPackageOptions object opts. You cannot specify any other options using name-value arguments.

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results = compiler.build.javaPackage(___) returns build information as a compiler.build.Results object using any of the input argument combinations in previous syntaxes. The build information consists of the build type, paths to the compiled files, and build options.

Examples

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Create a Java package using a function file that generates a magic square.

In MATLAB, locate the MATLAB function that you want to deploy as a Java package. For this example, use the file magicsquare.m located in matlabroot\extern\examples\compiler.

appFile = fullfile(matlabroot,'extern','examples','compiler','magicsquare.m');

Build a Java package using the compiler.build.javaPackage command.

compiler.build.javaPackage(appFile);

This syntax generates the following within a folder named magicsquarejavaPackage in your current working directory:

  • classes — Folder that contains the Java class files and the deployable archive file.

  • doc — Folder that contains HTML documentation for all classes in the package.

  • examples — Folder that contains Java source code files.

  • GettingStarted.html — File that contains information on integrating your package.

  • includedSupportPackages.txt — Text file that lists all support files included in the package.

  • magicsquare.jar — Java archive file.

  • mccExcludedFiles.log — Log file that contains a list of any toolbox functions that were not included in the application. For information on non-supported functions, see Functions Not Supported For Compilation.

  • readme.txt — Readme file that contains information on deployment prerequisites and the list of files to package for deployment.

  • requiredMCRProducts.txt — Text file that contains product IDs of products required by MATLAB Runtime to run the application.

  • unresolvedSymbols.txt — Text file that contains information on unresolved symbols.

Create a Java package and customize it using name-value arguments.

For this example, use the files flames.m and flames.mat located in matlabroot\extern\examples\compiler.

appFile = fullfile(matlabroot,'extern','examples','compiler','flames.m');
MATFile = fullfile(matlabroot,'extern','examples','compiler','flames.mat');

Build a Java package using the compiler.build.javaPackage command. Use name-value arguments to specify the package name, add a MAT-file, and enable verbose output.

compiler.build.javaPackage(appFile,'PackageName','JavaFlames',...
    'AdditionalFiles',MATFile,...
    'Verbose','on');

Create a Java package using a class map and multiple MATLAB functions.

Create a containers.Map object whose keys are class names and whose values are the locations of function files.

cmap = containers.Map;
cmap('Class1') = {'exampleFcn1.m','exampleFcn2.m'};
cmap('Class2') = {'exampleFcn3.m','exampleFcn4.m'};

Build a Java package using the compiler.build.javaPackage command.

compiler.build.javaPackage(cmap);

You can also specify options using name-value arguments when you build the Java package.

compiler.build.javaPackage(cmap,...
    'PackageName','ExamplePackage',...
    'Verbose','on');

Customize multiple Java packages using a compiler.build.JavaPackageOptions object on a Windows® system to specify a common output directory, use debug symbols, and enable verbose output.

For this example, use the file magicsquare.m located in matlabroot\extern\examples\compiler.

appFile = fullfile(matlabroot,'extern','examples','compiler','magicsquare.m');

Create a JavaPackageOptions object using appFile and additional options specified using name-value arguments.

opts = compiler.build.JavaPackageOptions(appFile,...
    'OutputDir','D:\Documents\MATLAB\work\JavaPackageBatch',...
    'DebugBuild','on',...
    'Verbose','on')
opts =

  JavaPackageOptions with properties:

               ClassMap: [1×1 containers.Map]
             DebugBuild: on
            PackageName: 'example.magicsquare'
  SampleGenerationFiles: {}
        AdditionalFiles: {}
    AutoDetectDataFiles: on
        SupportPackages: {'autodetect'}
                Verbose: on
              OutputDir: 'D:\Documents\MATLAB\work\JavaPackageBatch'

   Class Map Information
       magicsquareClass: {'C:\Program Files\MATLAB\R2021b\extern\examples\compiler\magicsquare.m'}

Build the Java package using the JavaPackageOptions object.

compiler.build.javaPackage(opts);

To compile using the function file hello.m with the same options, use dot notation to modify the ClassMap of the existing JavaPackageOptions object before running the build function again.

remove(opts.ClassMap, keys(opts.ClassMap));
opts.ClassMap('helloClass') = fullfile(matlabroot,'extern','examples','compiler','hello.m');
compiler.build.javaPackage(opts);

By modifying the ClassMap argument and recompiling, you can compile multiple components using the same options object.

Create a Java package and save information about the build type, generated files, included support packages, and build options to a compiler.build.Results object.

Compile using the file magicsquare.m located in matlabroot\extern\examples\compiler.

results = compiler.build.javaPackage('magicsquare.m')
results = 

  Results with properties:

              BuildType: 'javaPackage'
                  Files: {3×1 cell}
IncludedSupportPackages: {}
                Options: [1×1 compiler.build.JavaPackageOptions]

The Files property contains the paths to the following:

  • doc folder

  • magicsquare.jar

  • GettingStarted.html

Input Arguments

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Files implementing MATLAB functions, specified as a character vector, a string scalar, a string array, or a cell array of character vectors. File paths can be relative to the current working directory or absolute. Files must have a .m extension.

Example: ["myfunc1.m","myfunc2.m"]

Data Types: char | string | cell

Class map, specified as a containers.Map object. Map keys are class names and each value is the set of files mapped to the corresponding class. Files must have a .m extension.

Example: cmap

Java package build options, specified as a compiler.build.JavaPackageOptions object.

Name-Value Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: 'Verbose','on'

Additional files to include in the Java package, specified as a character vector, a string scalar, a string array, or a cell array of character vectors. File paths can be relative to the current working directory or absolute.

Example: 'AdditionalFiles',["myvars.mat","data.txt"]

Data Types: char | string | cell

Flag to automatically include data files, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

  • If you set this property to 'on', then data files that you provide as inputs to certain functions (such as load and fopen) are automatically included in the Java package.

  • If you set this property to 'off', then you must add data files to the package using the AdditionalFiles property.

Example: 'AutoDetectDataFiles','off'

Data Types: logical

Name of the Java class, specified as a character vector or a string scalar. You cannot specify this option if you use a ClassMap input. Class names must meet Java class name requirements.

The default value is the name of the first file listed in the Files argument appended with Class.

Example: 'ClassName','magicsquareClass'

Data Types: char | string

Flag to enable debug symbols, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

  • If you set this property to 'on', then the compiled package contains debug symbols.

  • If you set this property to 'off', then the compiled package does not contain debug symbols.

Example: 'DebugBuild','on'

Data Types: logical

Path to the output directory where the build files are saved, specified as a character vector or a string scalar. The path can be relative to the current working directory or absolute.

The default name of the build folder is the package name appended with javaPackage.

Example: 'OutputDir','D:\Documents\MATLAB\work\mymagicjavaPackage'

Data Types: char | string

Name of the Java package, specified as a character vector or a string scalar. Specify 'PackageName' as a namespace, which is a period-separated list, such as companyname.groupname.component. The name of the generated package is set to the last entry of the period-separated list. The name must begin with a letter and contain only alphabetic characters and periods.

Example: 'PackageName','mathworks.javapackage.mymagic'

Data Types: char | string

MATLAB sample files used to generate sample Java driver files for functions included within the package, specified as a character vector, a string scalar, a string array, or a cell array of character vectors. File paths can be relative to the current working directory or absolute. Files must have a .m extension.

Example: 'SampleGenerationFiles',["sample1.m","sample2.m"]

Data Types: char | string | cell

Support packages to include, specified as one of the following options:

  • 'autodetect' (default) — The dependency analysis process detects and includes the required support packages automatically.

  • 'none' — No support packages are included. Using this option can cause runtime errors.

  • A string scalar, character vector, or cell array of character vectors — Only the specified support packages are included. To list installed support packages or those used by a specific file, see compiler.codetools.deployableSupportPackages.

.

Example: 'SupportPackages',{'Deep Learning Toolbox Converter for TensorFlow Models','Deep Learning Toolbox Model for Places365-GoogLeNet Network'}

Data Types: char | string | cell

Flag to control build verbosity, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

  • If you set this property to 'on', then the MATLAB command window displays progress information indicating compiler output during the build process.

  • If you set this property to 'off', then the command window does not display progress information.

Example: 'Verbose','on'

Data Types: logical

Output Arguments

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Build results, returned as a compiler.build.Results object. The Results object contains:

  • Build type, which is 'javaPackage'

  • Paths to the compiled files

  • A list of included support packages

  • Build options, specified as a JavaPackageOptions object

Introduced in R2021a