SSH Signing commits does not work

[draganbjedov]

Apache NetBeans version

Apache NetBeans 29

What happened

I have setup signing git commits with ssh, but I have same issue if I choose gpg.

[user]
	name = Dragan Bjedov
	email = draganbjedov@gmail.com
	signingkey = C:\\Users\\dragan\\.ssh\\id_ed25519
[gpg]
	format = ssh
[commit]
	gpgsign = true

When I try to commit changes error appears:

org.eclipse.jgit.api.errors.UnsupportedSigningFormatException: 
No signer for ssh signatures. 
Use another signature type for git config gpg.format, or do not sign.

Commit from terminal works fine.

Same issue is visible on Windows and Linux.

I checked and jgit supports signing with ssh or gpg: eclipse-jgit/jgit#44

Language / Project Type / NetBeans Component

No response

How to reproduce

Enable signing commits as show above and try to commit from NetBeans.

Did this work correctly in an earlier version?

No / Don't know

Operating System

Windows, Linux Mint

JDK

JDK 25

Apache NetBeans packaging

Apache NetBeans binary zip

Anything else

No response

Are you willing to submit a pull request?

No

[matthiasblaesing]

Probably duplicate of #8776. Please wait for NB30 (currently in Vote) or test 30-RC2: #9345

[draganbjedov]

@matthiasblaesing I have tried RC2 https://nightlies.apache.org/netbeans/candidate/netbeans/
And I still got same error when trying to sign with ssh.

[matthiasblaesing]

@draganbjedov please provide the message log when you try to sign. Is the key usable without a passphrase?

[draganbjedov]

Yes, key is usable without passphrase and all works with terminal.

org.eclipse.jgit.api.errors.UnsupportedSigningFormatException: 
No signer for ssh signatures. 
Use another signature type for git config gpg.format, or do not sign.

==[IDE]== 18 May 2026, 09:35:16 Committing...
Git Commit
----------
git add C:\Users\dragan\Projects\subtitle-editor\lib\subtitle-editor-core\pom.xml
git commit -m Update maven-compiler-plugin version to 3.15.0 C:\Users\dragan\Projects\subtitle-editor\lib\subtitle-editor-core\pom.xml
INFO: End of Commit

INFO [org.netbeans.ui.metrics.vcs]: USG_VCS_ACTION
INFO [org.netbeans.ui.metrics.vcs]: USG_VCS_REPOSITORY
WARNING [org.netbeans.modules.progress.spi.InternalHandle]: Cannot call progress on a task that was never started at org.netbeans.modules.git.client.GitProgressSupport.setProgressMessage(GitProgressSupport.java:258)
INFO [org.netbeans.modules.bugtracking.BugtrackingManager]: Loading stored repositories took 22 millis.
WARNING [org.netbeans.modules.progress.spi.InternalHandle]: Cannot call progress on a task that was never started at org.netbeans.modules.git.client.GitProgressSupport.setProgressMessage(GitProgressSupport.java:258)
WARNING [null]: Last record repeated again.
INFO [org.netbeans.ui.vcs]: Versioning command INTERNAL-add called, took 41ms.
INFO [org.netbeans.ui.vcs]: Versioning command INTERNAL-commit called, took 72ms.
INFO [org.netbeans.modules.git]: org.eclipse.jgit.api.errors.UnsupportedSigningFormatException: No signer for ssh signatures. Use another signature type for git config gpg.format, or do not sign.
org.eclipse.jgit.api.errors.UnsupportedSigningFormatException: No signer for ssh signatures. Use another signature type for git config gpg.format, or do not sign.
	at org.eclipse.jgit.api.CommitCommand.sign(CommitCommand.java:327)
	at org.eclipse.jgit.api.CommitCommand.call(CommitCommand.java:281)
	at org.netbeans.libs.git.jgit.commands.CommitCommand.run(CommitCommand.java:138)
Caused: org.netbeans.libs.git.GitException
	at org.netbeans.libs.git.jgit.commands.CommitCommand.run(CommitCommand.java:153)
	at org.netbeans.libs.git.jgit.commands.GitCommand.execute(GitCommand.java:49)
	at org.netbeans.libs.git.GitClient.commit(GitClient.java:491)
	at org.netbeans.modules.git.client.GitClient$9.call(GitClient.java:298)
	at org.netbeans.modules.git.client.GitClient$9.call(GitClient.java:294)
	at org.netbeans.modules.git.client.GitClient$CommandInvoker$1$1.call(GitClient.java:945)
	at org.netbeans.modules.git.client.GitClient$CommandInvoker$1.call(GitClient.java:968)
	at org.netbeans.modules.git.FilesystemInterceptor.runWithoutExternalEvents(FilesystemInterceptor.java:477)
	at org.netbeans.modules.git.Git.runWithoutExternalEvents(Git.java:259)
	at org.netbeans.modules.git.client.GitClient$CommandInvoker.runMethodIntern(GitClient.java:978)
	at org.netbeans.modules.git.client.GitClient$CommandInvoker.runMethod(GitClient.java:905)
	at org.netbeans.modules.git.client.GitClient.commit(GitClient.java:294)
	at org.netbeans.modules.git.ui.commit.CommitAction$CommitProgressSupport.commit(CommitAction.java:343)
[catch] at org.netbeans.modules.git.ui.commit.CommitAction$CommitProgressSupport.perform(CommitAction.java:234)
	at org.netbeans.modules.git.client.GitProgressSupport.performIntern(GitProgressSupport.java:92)
	at org.netbeans.modules.git.client.GitProgressSupport.run(GitProgressSupport.java:85)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1370)
	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:287)
	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1981)
WARNING [org.netbeans.modules.options.keymap.LayersBridge]: Invalid shortcut: org.openide.loaders.XMLDataObject@27651d4b[MultiFileObject@22a5ed51[Actions/Help/master-help.xml]]
INFO [org.netbeans.ui.indexing]: Indexing started, time from last indexing 92.908 ms.
INFO [org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater]: Resolving dependencies took: 11 ms
INFO [org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater]: Complete indexing of 0 binary roots took: 1 ms
INFO [org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater]: Indexing of: C:\Users\dragan\Downloads\netbeans\webcommon\jsstubs\core-stubs.zip took: 195 ms (New or modified files: 0, Deleted files: 0) [Adding listeners took: 0 ms]
INFO [org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater]: Indexing of: C:\Users\dragan\Downloads\netbeans\webcommon\jsstubs\dom-stubs.zip took: 137 ms (New or modified files: 0, Deleted files: 0) [Adding listeners took: 0 ms]
INFO [org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater]: Complete indexing of 2 source roots took: 332 ms (New or modified files: 0, Deleted files: 0) [Adding listeners took: 0 ms]
INFO [org.netbeans.ui.indexing]: Indexing finished, indexing took 345 ms.

Product Version: Apache NetBeans IDE 30-rc2
Java: 25.0.3; OpenJDK 64-Bit Server VM 25.0.3+9-LTS
Runtime: OpenJDK Runtime Environment 25.0.3+9-LTS
System: Windows 11 version 10.0 running on amd64; UTF-8; en_US (nb)
User directory: C:\Users\dragan\AppData\Roaming\NetBeans\30-rc2
Cache directory: C:\Users\dragan\AppData\Local\NetBeans\Cache\30-rc2

[matthiasblaesing]

This is not about general signing - that works now. This is only about SSH signing. This requires either a custom implementation of the support or a switch from the jsch library to the mina transport jgit can use.

[mbien]

related #7572