docs.sheetjs.com/docz/docs/03-demos/42-engines/24-graaljs.md

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Data Processing with GraalJS	Java + GraalJS	demos/bigdata/index	solutions/input

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GraalJS is a JS engine for Java. The project offers a JSR-223 compliant OpenJDK-compatible build.

SheetJS is a JavaScript library for reading and writing data from spreadsheets.

The "Complete Example" section includes a complete Java command-line tool for reading data from spreadsheets and printing CSV rows.

:::info pass

The Java packages used in this demo are covered under open source licenses. The Universal Permissive License covers most of the packages, while icu4j uses a different, yet still permissive, license.

:::

Integration Details

:::info pass

When this demo was last tested, raw byte arrays could not be passed to GraalJS.

This is a limitation of the default GraalJS behavior.

Instead, this demo uses Nashorn Compatibility Mode¹ through a runtime flag:

java -Dpolyglot.js.nashorn-compat=true ...

:::

The Nashorn demo code and explanation applies to JSR-223 compatible ScriptEngine implementations, including GraalJS.

Complete Example

:::note Tested Deployments

This demo was tested in the following deployments:

OpenJDK	GraalJS	Date
22	24.0.1	2024-05-25
21.0.3	24.0.1	2024-05-25
20.0.2	24.0.1	2024-05-25
19.0.2	24.0.1	2024-05-25
18.0.2	24.0.1	2024-05-25
17.0.10	24.0.1	2024-05-25

:::

Compilation

0. Download GraalJS and its dependencies:

curl -LO "https://repo1.maven.org/maven2/org/graalvm/js/js-scriptengine/24.0.1/js-scriptengine-24.0.1.jar"
curl -LO "https://repo1.maven.org/maven2/org/graalvm/js/js-language/24.0.1/js-language-24.0.1.jar"
curl -LO "https://repo1.maven.org/maven2/org/graalvm/polyglot/polyglot/24.0.1/polyglot-24.0.1.jar"
curl -LO "https://repo1.maven.org/maven2/org/graalvm/sdk/collections/24.0.1/collections-24.0.1.jar"
curl -LO "https://repo1.maven.org/maven2/org/graalvm/truffle/truffle-api/24.0.1/truffle-api-24.0.1.jar"
curl -LO "https://repo1.maven.org/maven2/org/graalvm/sdk/nativeimage/24.0.1/nativeimage-24.0.1.jar"
curl -LO "https://repo1.maven.org/maven2/org/graalvm/shadowed/icu4j/24.0.1/icu4j-24.0.1.jar"
curl -LO "https://repo1.maven.org/maven2/org/graalvm/regex/regex/24.0.1/regex-24.0.1.jar"

1. Download the SheetJS Standalone script, shim script and test file. Move all three files to the project directory:

• xlsx.full.min.js
• shim.min.js
• pres.xlsx

{\ curl -LO https://cdn.sheetjs.com/xlsx-${current}/package/dist/xlsx.full.min.js curl -LO https://cdn.sheetjs.com/xlsx-${current}/package/dist/shim.min.js curl -LO https://docs.sheetjs.com/pres.xlsx}

2. Download SheetJSNashorn.java:

curl -LO https://docs.sheetjs.com/nashorn/SheetJSNashorn.java

3. Build the sample class:

javac SheetJSNashorn.java

This program tries to parse the file specified by the first argument and prints CSV rows from the first worksheet.

Standalone Test

4. Run the command directly:

java -cp ".:js-scriptengine-24.0.1.jar:js-language-24.0.1.jar:polyglot-24.0.1.jar:collections-24.0.1.jar:truffle-api-24.0.1.jar:nativeimage-24.0.1.jar:icu4j-24.0.1.jar:regex-24.0.1.jar" -Dpolyglot.js.nashorn-compat=true SheetJSNashorn pres.xlsx

java -cp ".;js-scriptengine-24.0.1.jar;js-language-24.0.1.jar;polyglot-24.0.1.jar;collections-24.0.1.jar;truffle-api-24.0.1.jar;nativeimage-24.0.1.jar;icu4j-24.0.1.jar;regex-24.0.1.jar" -D"polyglot.js.nashorn-compat=true" SheetJSNashorn pres.xlsx

If successful, CSV rows from the first worksheet will be displayed.

Java Archive Test

5. Assemble a Java Archive:

jar -cf SheetJSNashorn.jar SheetJSNashorn.class xlsx.full.min.js shim.min.js

6. Create new directory and copy the archives and test file:

mkdir -p sheethorn
cp *.jar pres.xlsx sheethorn
cd sheethorn

7. Run the program using the Java Archive:

java -cp ".:js-scriptengine-24.0.1.jar:js-language-24.0.1.jar:polyglot-24.0.1.jar:collections-24.0.1.jar:truffle-api-24.0.1.jar:nativeimage-24.0.1.jar:icu4j-24.0.1.jar:regex-24.0.1.jar:SheetJSNashorn.jar" -Dpolyglot.js.nashorn-compat=true  SheetJSNashorn pres.xlsx

java -cp ".;js-scriptengine-24.0.1.jar;js-language-24.0.1.jar;polyglot-24.0.1.jar;collections-24.0.1.jar;truffle-api-24.0.1.jar;nativeimage-24.0.1.jar;icu4j-24.0.1.jar;regex-24.0.1.jar;SheetJSNashorn.jar" -D"polyglot.js.nashorn-compat=true"  SheetJSNashorn pres.xlsx

This should print the same CSV rows from Step 4.

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1. See "Nashorn Compatibility Mode" in the GraalJS documentation. ↩︎