Extension not loading - jacoco error

[nadeemabdulhamid]

I have a completely fresh install of VS Code on Mac OS X, with a JDK 21 environment. Installed the extension pack for Java, but the test runner extension seems to be failing to load with the error below. None of its functionality is available when I open a Java project folder.

[Error - 3:18:51 PM] Apr 1, 2025, 3:18:50 PM FrameworkEvent ERROR
org.osgi.framework.BundleException: Could not resolve module: com.microsoft.java.test.plugin [118]
  Unresolved requirement: Require-Bundle: org.jacoco.core; bundle-version="0.8.12"
    -> Bundle-SymbolicName: org.jacoco.core; bundle-version="0.8.12.202403310830"
       org.jacoco.core [117]
         Unresolved requirement: Import-Package: org.objectweb.asm; version="[9.7.0,9.8.0)"

	at org.eclipse.osgi.container.Module.start(Module.java:495)
	at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel$2.run(ModuleContainer.java:2111)
	at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor$1$1.execute(EquinoxContainerAdaptor.java:146)
	at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:2102)
	at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:2042)
	at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:2004)
	at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1916)
	at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
	at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:341)

[jpmckown]

I am also encountering this issue. It started happening about 1.5 hours ago.

[nadeemabdulhamid]

OK, I've figured it out - the latest update for the "Language Support for Java(TM) by Red Hat" extension uses ASM 9.8, while the version of JaCoCo used by the Test Runner extension only supports up through 9.7.x. So, if you downgrade the "Language Support for Java(TM)" to version 1.40.0, the test support works again!

[jpmckown]

OK, I've figured it out - the latest update for the "Language Support for Java(TM) by Red Hat" extension uses ASM 9.8, while the version of JaCoCo used by the Test Runner extension only supports up through 9.7.x. So, if you downgrade the "Language Support for Java(TM)" to version 1.40.0, the test support works again!

Nice sleuthing. 👏

1.41.0 works for me. I noticed that 1.41.1 was tagged as having been published 3 hours ago and it was only today that I started running into this issue.

[rgrunber]

Yup, redhat-developer/vscode-java#3995 (comment) . So

vscode-java-test/java-extension/com.microsoft.java.test.target/com.microsoft.java.test.tp.target

Lines 29 to 33 in dfeddc4

	<dependency>
	<groupId>org.jacoco</groupId>
	<artifactId>org.jacoco.core</artifactId>
	<version>0.8.12</version>
	</dependency>

needs to be updated when jacoco releases a version that supports ASM 9.8. That was merged yesterday (jacoco/jacoco#1862) so hopefully it's released soon.

[derekhsu]

+1. I encounted this problem and spent hours to solve it. 😢

[rgrunber]

If the new ASM update in jacoco is taking too long to release, I think there's another fix that could work.

Right now you're using jacoco 0.8.12 which only supports up to ASM 9.7, but JDT-LS is providing ASM 9.8 because that's what the underlying Eclipse platform adopted. You can require the old ASM version and just inject that as well when the test plugin gets loaded into JDT-LS. The ASM bundles are libraries (not singletons) so multiple versions can co-exist just fine. Jacoco will find the verison it supports.

See rgrunber@ca87967 .
I also included a test vsix at https://github.com/rgrunber/vscode-java-test/raw/refs/heads/fix-1759/vscode-java-test-0.43.1.vsix which seems to solve the issue for me. I can submit this as a PR if it really fixes things.

[raffian]

I'd rather lose my phone than my shiny green test icon.

Anyway, same issue with latest update, FIXED after downgrading to redhat 1.41.0

[rgrunber]

Raffi Basmajian (@raffian) can you try the vsix linked in #1759 (comment) ? That solved the issue for me.

[raffian]

@raffian can you try the vsix linked in #1759 (comment) ? That solved the issue for me.

My apologies but strict firewall prevents me from downloading it, even official ones don't always work - had to try three times in vscode before the extension downgraded.

[emouawad]

+1 same here - hours lost before i found this!

[awaxis]

OK, I've figured it out - the latest update for the "Language Support for Java(TM) by Red Hat" extension uses ASM 9.8, while the version of JaCoCo used by the Test Runner extension only supports up through 9.7.x. So, if you downgrade the "Language Support for Java(TM)" to version 1.40.0, the test support works again!

Lost my day on this issue :/
Downgrading the "Language Support for Java(TM)" to version 1.40.0 worked fine for me.
Thanks a lot.

[jrg94]

Looks like jacoco had a release today that supports ASM 9.8: https://github.com/jacoco/jacoco/releases/tag/v0.8.13

[jdneo]

Test Runner for Java (vscjava.vscode-java-test) pre-release 0.43.2025040304 is published with the fix, please install it and let me know if you still have the problem. Thank you!