Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

java.lang.NoClassDefFoundError

Open
#1,519 1 comment 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
java, vscode
Domain
devtools

Research direction

Start by reproducing the terminal error for the Test3 entry point described in the issue and inspect the attached screenshot. No source file, test, or repository entry point is identified, so first determine whether the failure is in the Java class name/package setup or in vscode-java-debug; done means identifying a reproducible debugger behavior and a verified fix or clear project guidance.

Written by the indexing model from the issue text.

Description

ai-triaged question

i have this issue when i run code in the first line happen the issue and the terminal says: Error: Could not find or load main class Test3
Caused by: java.lang.NoClassDefFoundError: Test3 (wrong name: Java/Test3)
Image

Dominant language
TypeScript
Stars
591
Forks
429
Avg merge
1d 9h
Merged PRs (30d)
19

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

More from microsoft/vscode-java-debug

All issues in microsoft/vscode-java-debug

Similar issues

More TypeScript issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.