It seems to be a problem on my node.

The jobs running on the master are working. The jobs running on a node report the following:

 
Scripts not permitted to use method java.util.regex.MatchResult group int. You will need to manually approve the call in the Script Approval UI.
 

Found something similar in the warnings plugin issues: JENKINS-43813

Not sure if the problem is located in this plugin or the warning plugin, because in my case the failing stuff is also from warnings plugin.

Approve assuming permission check is certainly wrong for this method.

As for the rest of it, not sure offhand. Possibly user error. Steps to reproduce from scratch?

Thanks for the response.

Steps to reproduce:

1) Install latest warnings plugin

2) Go to "Manage Jenkins" -> "Configure System" -> "Compiler Warnings"

3) Add parser as shown in attached screenshot (parser.PNG)

4) Generate freestyle job and add a build step (here: Windows batch) and post build action as shown in attached screenshot (job.PNG)

5) Run the job on master (therefore, you can select "Restrict where this project can be run" to "master" in the job configuration)

6) It should work (probably you need to approve permissions) and you should see the following console output:
[WARNINGS] Parsing warnings in files 'foo.txt' with parser Dummy Parser
[WARNINGS] Searching for all files in C:\Program Files (x86)\Jenkins\workspace\TestWarnings that match the pattern foo.txt
[WARNINGS] Parsing 1 file in C:\Program Files (x86)\Jenkins\workspace\TestWarnings
[WARNINGS] Successfully parsed file C:\Program Files (x86)\Jenkins\workspace\TestWarnings\foo.txt with 1 unique warning and 0 duplicates.
[WARNINGS] Computing warning deltas based on reference build #9
Finished: SUCCESS
7) Change  "Restrict where this project can be run" to a node (yes, sorry, you need to have a node) and start the job again. Now, you always see a pending approval which was already approved. After approving, you can run the job again on the node and the signature needs approval again. The console output of the job is like:
[WARNINGS] Parsing warnings in files 'foo.txt' with parser Dummy Parser
[WARNINGS] Groovy sandbox rejected the parsing script for parser Dummy Parser: Scripts not permitted to use new hudson.plugins.warnings.parser.Warning java.lang.String int java.lang.String java.lang.String java.lang.String. You will need to manually approve the call in the Script Approval UI.
[WARNINGS] Computing warning deltas based on reference build #8
You see, that parsing the script was rejected!

Let me know if you need further information.

Thanks again!

Possibly a bug in warnings.