Java Project Build Stuck at "Synchronizing Projects"

[rennsax]

Environment:

VS Code Version: 1.77.1
Extension Version: 1.16.0
JDK Type & Version: 11, homebrew
OS Type & Version: Mac
Step to Reproduce: reload VS Code window, sometimes.

Expected Behavior: build the project successfully, not taking too much time.

Actual Behavior: I always find myself stuck in the Synchronizing projects step, which takes a long long time.
Here is an example output of Java Build Status:

bedc422b Repository registry initialization [Done]
1b7a7d2b Importing Maven project(s) [Done]
331283e3 Synchronizing projects: 0% [0/1000]
f1113ce7 Synchronizing projects: 0% [0/1000]

This status can hold on for more than 5 minutes sometimes, during which I cannot modify my code since the code checking and suggestions are just wrong.

Generally, after refreshing the window, the problem still exits. But magically, sometimes my VS Code can build the project immediately!

I'm not sure what synchronizing projects is doing actually. But if this step is unnecessary, I think it would be better if I can skip the step optionally by editing my configurations.

Related Issues: Not sure

[snjeza]

@Eitheages Could you attach a project example reproducing the error?

[testforstephen]

Recently when I use pre-release version to develop eclipse.jdt.ls in VS Code, I also noticed that reloading window takes longer in "Synchronizing projects" than it did before.

Previously I suspected it's related with maven parallel downloading (#3030 (comment)). However, it seems this issue persists in stable version 1.16.0, which doesn't include parallel downloading feature. There should be some other reasons causing this problem.

[rennsax]

@Eitheages Could you attach a project example reproducing the error?

Sorry for that I just cannot reproduce this problem these days. In fact, this problem truly exists for each of my Maven project. Maybe the new release has resolve the bug.

I'll provide more information once the problem occurs again. Thanks very much!

[fbricon]

Could it be caused by the STS extension? spring-projects/sts4#1012 (comment)

[testforstephen]

Have this issue again when working on eclipse.jdt.ls with java 1.17.0 installed, no STS extension installed.

7bfa03ec Importing Maven project(s) [Done]
22bebabd Synchronizing projects: 0%  [1/1000]
dcdccc12 Synchronizing projects: 0%  [0/1000]
65c834d4 Synchronizing projects: 0%  [0/1000]
a1a5f455 Refreshing workspace: 5% Refreshing '/org.eclipse.jdt.ls.filesystem'. [49/1000]
9e59e9e4 Background task: 0%  [0/1000]
2ddac2d9 Synchronizing projects: 0%  [0/1000]

Here is the thread dump.
jstack1.txt

[rgrunber]

Any chance this was similar/same as #3411 #2972 (reported at start of 2023, but finally resolved at end of it) ? Could it be closed ?

[rennsax]

Closed since cannot be reproduced.