Checkstyle execution failed due to an internal error. Please check the error log for details.

[srasku]

I am running Eclipse Photon (4.8.0) with Checkstyle 8.11.0 plugin.

When I right-click my file and select "Checkstyle >> Check Code with Checkstyle" I get "Checkstyle execution failed due to an internal error. Please check the error log for details."

[srasku]

Here's the log file and the checkstyle configuration.

• metadata.log
• checkstyle.txt

[rnveach]

From the CLI checkstyle, your configuration is fine for version 8.11 .

The metadata log file doesn't really say any errors for eclipse-cs. It is just showing errors for jgit and gradle.

java.lang.ClassNotFoundException: org.eclipse.jgit.lfs.BuiltinLFS cannot be found by org.eclipse.egit.core_5.0.0.201806131550-r
org.gradle.api.UncheckedIOException: Cannot download published Gradle versions.
java.net.UnknownHostException: dev.eclipse.org: nodename nor servname provided, or not known

can you see any error for eclipse-cs in the error log view?

[srasku]

I've exported the Eclipse error log and attached it. I didn't notice anything regarding eclipse-cs.

• Eclipse Error.log

[romani]

Looks like it is unrelated to checkstyle plug-in.
@srasku , is it happening all the time ? Please share so other details of your eclipse (os type and version, Java version, other plug-in version). Looks like problem with git plugin in eclipse.

[srasku]

It always happens. Checkstyle never works.

I'm running on macOS 10.13.5.

$ javac -version
javac 1.8.0_144

I've removed the Git plugins but the problem still occurs.

[romani]

Is it still the same problem java.lang.ClassNotFoundException: org.eclipse.jgit.lfs.BuiltinLFS cannot be found by org.eclipse.egit.core_5.0.0.201806131550-r ?

Try to update jgit plugin, I see it in your plugin list.
I mite be good to look at sources of such plugin in case smth is changed ( class is renamed or moved to diff package)

[srasku]

I've updated egit and I don't see that error any more.

• Updated egit.log

I also reconfigured my proxy which allowed me to connect to Eclipse Marketplace. I wasn't able to do that before. Unfortunately, Checkstyle is still not working.

[romani]

From your log :

!MESSAGE Checkstyle-Plugin: SuppressionCommentFilter is not allowed as a child in Checker
!STACK 0
com.puppycrawl.tools.checkstyle.api.CheckstyleException: SuppressionCommentFilter is not allowed as a child in Checker

Looks like your confirmation need to be updated as you updated version of checkstyle.
Take a look at breacking changes in http://checkstyle.sourceforge.net/releasenotes.html#Release_8.1 for SuppressionCommentFilter and follow migration recommendations.

[rnveach]

checkstyle.txt
com.puppycrawl.tools.checkstyle.api.CheckstyleException: SuppressionCommentFilter is not allowed as a child in Checker

The configuration you gave us has no SuppressionCommentFilter. Either you gave us the wrong configuration or your eclipse isn't using the configuration you think it is.

[srasku]

Thanks, @rnveach. I didn't checkin my Checkstyle configuration. Restoring it is the final step to solving this problem.

It's working now.

[msaifusmani]

I am also getting the same error with regards to Checkstyle, @srasku how did you fix it? How did you restore it as you said in your last response?