j2ts-jre

library92.0.0jsnpmunverified

Runtime library required for code transpiled by the Java2TypeScript (J2TS) transpiler. Stable version 92.0.0 provides a set of Java-like utilities (e.g., ArrayList, HashMap) for TypeScript/JavaScript environments. Release cadence is tied to the J2TS transpiler. Key differentiator: enables running Java-derived code directly on Node.js or in browsers with minimal overhead. Only use as a dependency for J2TS projects.

serialization web-framework

npm install j2ts-jre

github ↗package ↗

INSTALL

IMPORT

SIG · J2TS-JRE

j2ts-jre

serializationjavascriptv92.0.0

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

ArrayList

✓ import { ArrayList } from 'j2ts-jre'

✗ const ArrayList = require('j2ts-jre').ArrayList

ESM-only package. No default export.

HashMap

✓ import { HashMap } from 'j2ts-jre'

✗ import HashMap from 'j2ts-jre'

Named export. Default import will fail.

StringBuilder

✓ import { StringBuilder } from 'j2ts-jre'

✗ import { StringBuilder } from 'j2ts-jre/src/index'

Do not deep-import internal paths.

RuntimeExportedClass

✓ import { RuntimeExportedClass } from 'j2ts-jre'

Any class from J2TS is exported from the package root.

Demonstrates creating an ArrayList, adding elements, accessing by index, and iteration.

import { ArrayList } from 'j2ts-jre'; // Create an ArrayList and add elements const list = new ArrayList<string>(); list.add('hello'); list.add('world'); console.log(list.size()); // 2 // Iterate for (let i = 0; i < list.size(); i++) { console.log(list.get(i)); }

Debug

Known issues

gotchaPackage is a runtime dependency for J2TS transpiled code. Do not manually add unless you are using the J2TS transpiler.

fix

Follow J2TS documentation for setup.

affects: >=0.0.0

breakingBreaking changes occur frequently with major version bumps due to transpiler compatibility. See J2TS changelog.

fix

Upgrade both J2TS and j2ts-jre together.

affects: <92.0.0

deprecatedSome Java methods may be deprecated in future versions. Check source for deprecation warnings.

fix

Use alternative methods as indicated in documentation.

affects: >=92.0.0

Errors

Common errors & fixes

Cannot find module 'j2ts-jre'

Package not installed or missing from package.json.

fix

Run 'npm install j2ts-jre'

TypeError: ArrayList is not a constructor

Incorrect import pattern (e.g., default import instead of named import).

fix

Use 'import { ArrayList } from 'j2ts-jre''

Module not found: Error: Can't resolve 'j2ts-jre/src/ArrayList'

Deep importing internal modules instead of using the main export.

fix

Import from the package root: 'import { ArrayList } from 'j2ts-jre''

Upgrade

Version history

92.0.0latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/datathings/java2typescript ↗

packagehttps://www.npmjs.com/package/j2ts-jre ↗