[JENKINS-67749] ERROR: Tag must follow the pattern

After Updating the Jenkins plugins we are getting the below error.

```
ERROR: Tag must follow the pattern '^:[a-zA-Z0-9_]([a-zA-Z0-9_.-])\{0,127}'
at hudson.util.FormValidation._errorWithMarkup(FormValidation.java:268)
at hudson.util.FormValidation.errorWithMarkup(FormValidation.java:254)
at hudson.util.FormValidation.error(FormValidation.java:145)
at hudson.util.FormValidation.error(FormValidation.java:170)
at org.jenkinsci.plugins.docker.commons.credentials.ImageNameValidator.validateTag(ImageNameValidator.java:244)
at org.jenkinsci.plugins.docker.commons.credentials.ImageNameValidator.validateUserAndRepo(ImageNameValidator.java:116)
at org.jenkinsci.plugins.docker.commons.credentials.DockerRegistryEndpoint.imageName(DockerRegistryEndpoint.java:317)
at jdk.internal.reflect.GeneratedMethodAccessor651.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.methodCall(DefaultInvoker.java:20)
at org.jenkinsci.plugins.docker.workflow.Docker$Image.toQualifiedImageName(Docker.groovy:117)
at org.jenkinsci.plugins.docker.workflow.Docker$Image.tag(Docker.groovy:177)
at org.jenkinsci.plugins.docker.workflow.Docker.node(Docker.groovy:66)
at org.jenkinsci.plugins.docker.workflow.Docker$Image.tag(Docker.groovy:176)
at org.jenkinsci.plugins.docker.workflow.Docker$Image.push(Docker.groovy:190)
at org.jenkinsci.plugins.docker.workflow.Docker.node(Docker.groovy:66)
at org.jenkinsci.plugins.docker.workflow.Docker$Image.push(Docker.groovy:187)
at org.jenkinsci.plugins.docker.workflow.Docker$Image.push(Docker.groovy)
at WorkflowScript.run(WorkflowScript:167)
at org.jenkinsci.plugins.docker.workflow.Docker.withRegistry(Docker.groovy:41)

```

---
Originally reported by rameshar, imported from: ERROR: Tag must follow the pattern

• status: Open
  
• priority: Blocker
  
• component(s): docker-commons-plugin
  
• resolution: Unresolved
  
• votes: 1
  
• watchers: 10
  
• imported: 20260604-161841
  

Raw content of original issue

After Updating the Jenkins plugins we are getting the below error.



ERROR: Tag must follow the pattern '^:[a-zA-Z0-9_]([a-zA-Z0-9_.-])\{0,127}'

	at hudson.util.FormValidation._errorWithMarkup(FormValidation.java:268)

	at hudson.util.FormValidation.errorWithMarkup(FormValidation.java:254)

	at hudson.util.FormValidation.error(FormValidation.java:145)

	at hudson.util.FormValidation.error(FormValidation.java:170)

	at org.jenkinsci.plugins.docker.commons.credentials.ImageNameValidator.validateTag(ImageNameValidator.java:244)

	at org.jenkinsci.plugins.docker.commons.credentials.ImageNameValidator.validateUserAndRepo(ImageNameValidator.java:116)

	at org.jenkinsci.plugins.docker.commons.credentials.DockerRegistryEndpoint.imageName(DockerRegistryEndpoint.java:317)

	at jdk.internal.reflect.GeneratedMethodAccessor651.invoke(Unknown Source)

	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.base/java.lang.reflect.Method.invoke(Method.java:566)

	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)

	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)

	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)

	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)

	at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46)

	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)

	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)

	at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.methodCall(DefaultInvoker.java:20)

	at org.jenkinsci.plugins.docker.workflow.Docker$Image.toQualifiedImageName(Docker.groovy:117)

	at org.jenkinsci.plugins.docker.workflow.Docker$Image.tag(Docker.groovy:177)

	at org.jenkinsci.plugins.docker.workflow.Docker.node(Docker.groovy:66)

	at org.jenkinsci.plugins.docker.workflow.Docker$Image.tag(Docker.groovy:176)

	at org.jenkinsci.plugins.docker.workflow.Docker$Image.push(Docker.groovy:190)

	at org.jenkinsci.plugins.docker.workflow.Docker.node(Docker.groovy:66)

	at org.jenkinsci.plugins.docker.workflow.Docker$Image.push(Docker.groovy:187)

	at org.jenkinsci.plugins.docker.workflow.Docker$Image.push(Docker.groovy)

	at WorkflowScript.run(WorkflowScript:167)

	at org.jenkinsci.plugins.docker.workflow.Docker.withRegistry(Docker.groovy:41)

Start at ImageNameValidator.validateTag and validateUserAndRepo, then trace the Docker$Image.tag and push calls shown in the stack trace, including WorkflowScript line 167. Reproduce the reported workflow and determine which tag value reaches validation; done means the cause is confirmed and the reported workflow has regression coverage.

Written by the indexing model from the issue text.