Extension keeps building code, never finishing

[fo-fo]

I'm trying to use the vscode-java extension in VSCode, but it keeps on building the same source code (it seems) again and again, hogging 100% CPU.

I see lines like this in the Task - Java Build Status Terminal: 1e7bf092 Building: 72% Compiling foo/src/test/java/fi/bar/xyzzy/controller [720/1000]. After it completes, it starts again.

I set the "Trace" setting in Settings to "messages", and saw this in the logs multiple times: [Trace - 9:47:08 AM] Sending notification 'workspace/didChangeWatchedFiles'., followed by a bunch of [Trace - 9:47:08 AM] Received notification 'language/progressReport'.

My guess is that it somehow thinks that some of the watched files have changed. How can I find out which files are causing the build to re-trigger?

Environment

• Operating System: macOS Catalina 10.15.3
• JDK version: jdk1.8.0_161
• Visual Studio Code version: 1.43.2
• Java extension version: 0.58.0

Steps To Reproduce

Unfortunately it only happens in our fairly large proprietary project.

Current Result

Keeps rebuilding the code forever.

Expected Result

Should stop building after a reasonable time.

Additional Informations

[testforstephen]

@fo-fo if you change the java trace setting to "verbose", you will see the full logs about "workspace/didChangeWatchedFiles" notification.

[fo-fo]

@testforstephen Thanks, I was able to narrow down the cause. It seems that RAML code generation is the culprit, as didChangeWatchedFiles refers to the generated files and I can see the generated files' time stamps changing every few minutes. So, it seems like the build changes the files, which then triggers didChangeWatchedFiles and a rebuild, which again changes the files, and so on.

I'm not sure how to fix it though. We're using springmvc-raml-plugin Maven plugin and a custom Ant buildfile for preprocessing the RAML sources, as well as an Ant Replace task for post processing the generated files. (By the way, the issue doesn't happen in IntelliJ IDEA.)

Any ideas where I should start looking?

[testforstephen]

The built-in builder won't support ant, and it's an incremental builder, which is supposed to not regenerate the files. Do you have other building jobs running in the background?

[fo-fo]

@testforstephen Nope, no other build jobs running. And as soon as I turn off auto build I can see from the RAML file timestamps that the files are no longer being regenerated. Moreover, if I disable springmvc-raml-plugin in Maven's pom.xml the issue disappears. If I disable the Ant jobs but leave springmvc-raml-plugin enabled, the issue persists, so it seems like the Ant jobs are not the cause.

We also have swagger-codegen-maven-plugin and openapi-generator-maven-plugin, they work without a problem, so it must be something specific to how springmvc-raml-plugin works.

[testforstephen]

OK. By default, Intellij IDEA doesn't compile classes automatically, that's probably the reason why you didn't get the issue there.

[ianldgs]

This causes problems if you try to run maven commands.
Some files will be locked or modified by the autobuild process and then maven will fail.
Ideally, the autobuild should only run if a file is changed, is that possible?

Edit: see #1381

[cammarb]

I've been experiencing a similar issue. When opening a java project, the java build status is stuck at 68% Refreshing. Also, the extension Java Project and Spring Boot Dashboard never load.

I have googled and I haven't found a solution.

Enviroment:

• Operating System: Windows 10 20H1 build 19043.1110
• JDK version: 16.0.1
• Visual Studio Code version: 1.58.2

[snjeza]

@cammarb Could you check #2020 (comment)

[ianmarxent]

I had a similar issue; stuck building and would never finish. I checked out the troubleshooting guide here and found that cleaning out my workspace directory solved the problem for me (steps from link pasted below):

• Open the command palette
• select Java: Clean the Java Language Server Workspace
• select Restart and delete from the confirmation prompt

[SlappyAUS]

Has anyone been able to solve this? I am running since adding WSDL code gen though maven plugin cxf-codegen-plugin, VSCode won stop iterating over "Building" -> "Refreshing Workspace" in the Java Build Status Console. Very high temperatures and CPU usage.

[ralphavalon]

@SlappyAUS so, what @snjeza posted actually solves it. It just sucks that, until today, I still need to do it. I wish this was just fixed already.

[jterry-viacomcbs]

@ianmarxent bless you, this has saved me so much work, i've been blowing away these things by hand for months

[rafaelceravolo]

@fo-fo if you change the java trace setting to "verbose", you will see the full logs about "workspace/didChangeWatchedFiles" notification.

@fo-fo or @testforstephen I have the same problem (code keeps recompiling). Following your suggestion, I found the configuration to set to "verbose", but didn't find where the logs are logged.

Where can I see them?

[henry2man]

After some time having these issues, I've noticed that the problem went away. I'm mostly sure that I haven't changed anything. Maybe this is solved? What are your experiences these days?

[ianmarxent]

@henry2man I agree, I haven't seen this issue crop up recently. This may have been resolved in an update.