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Fix issue with github-plugin-configuration unmarshalling #390

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Closed

Fix issue with github-plugin-configuration unmarshalling #390

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vwagh-dev
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@vwagh-dev vwagh-dev commented Mar 7, 2025 •
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Issue:

Jenkins.getRootUrl() gets call very early in the Jenkins startup sequence causes CannotResolveClassException

com.thoughtworks.xstream.mapper.CannotResolveClassException: github-plugin-configuration
	at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:81)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:452)
	at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:46)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:47)
	at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:135)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1464)
	at hudson.util.XStream2.unmarshal(XStream2.java:230)
	at hudson.util.XStream2.unmarshal(XStream2.java:201)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1441)
	at hudson.XmlFile.unmarshal(XmlFile.java:196)
Caused: java.io.IOException: Unable to read /tmp/joc-1-home/github-plugin-configuration.xml
	at hudson.XmlFile.unmarshal(XmlFile.java:199)
	at hudson.XmlFile.unmarshal(XmlFile.java:179)
	at hudson.model.Descriptor.load(Descriptor.java:933)
	at org.jenkinsci.plugins.github.config.GitHubPluginConfig.<init>(GitHubPluginConfig.java:86)
	at org.jenkinsci.plugins.github.config.GitHubPluginConfig$$FastClassByGuice$$1415135912.GUICE$TRAMPOLINE(<generated>)
	at org.jenkinsci.plugins.github.config.GitHubPluginConfig$$FastClassByGuice$$1415135912.apply(<generated>)
	at com.google.inject.internal.DefaultConstructionProxyFactory$FastClassProxy.newInstance(DefaultConstructionProxyFactory.java:82)
	at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:114)
	at com.google.inject.internal.ConstructorInjector.access$000(ConstructorInjector.java:33)
	at com.google.inject.internal.ConstructorInjector$1.call(ConstructorInjector.java:98)
	at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:109)
	at hudson.ExtensionFinder$GuiceFinder$SezpozModule.onProvision(ExtensionFinder.java:607)
	at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:117)
	at com.google.inject.internal.ProvisionListenerStackCallback.provision(ProvisionListenerStackCallback.java:66)
	at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:93)
	at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:300)
	at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
	at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:169)
	at hudson.ExtensionFinder$GuiceFinder$FaultTolerantScope$1.get(ExtensionFinder.java:445)
	at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:45)
	at com.google.inject.internal.InjectorImpl$1.get(InjectorImpl.java:1101)
	at hudson.ExtensionFinder$GuiceFinder._find(ExtensionFinder.java:403)
	at hudson.ExtensionFinder$GuiceFinder.find(ExtensionFinder.java:394)
	at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:359)
	at hudson.ExtensionList.load(ExtensionList.java:384)
	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:320)
	at hudson.ExtensionList.getComponents(ExtensionList.java:184)
	at hudson.DescriptorExtensionList.load(DescriptorExtensionList.java:213)
	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:320)
	at hudson.ExtensionList.iterator(ExtensionList.java:172)
	at hudson.ExtensionList.getInstance(ExtensionList.java:162)
	at jenkins.model.JenkinsLocationConfiguration.get(JenkinsLocationConfiguration.java:65)
	at jenkins.model.Jenkins.getRootUrl(Jenkins.java:2461)

The error com.thoughtworks.xstream.mapper.CannotResolveClassException: github-plugin-configuration indicates that XStream is unable to resolve the class name github-plugin-configuration when trying to unmarshal the XML file

Fix:

Ensures that XStream can correctly map the github-plugin-configuration alias to the GitHubPluginConfig

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  • Link to relevant issues in GitHub or Jira
  • Link to relevant pull requests, esp. upstream and downstream changes
  • Ensure you have provided tests - that demonstrates feature works or fixes the issue

@vwagh-dev vwagh-dev marked this pull request as ready for review March 9, 2025 11:17
@vwagh-dev vwagh-dev requested a review from a team as a code owner March 9, 2025 11:17
@vwagh-dev vwagh-dev marked this pull request as draft March 11, 2025 12:20
rsandell
rsandell reviewed Mar 11, 2025
View reviewed changes
src/main/java/org/jenkinsci/plugins/github/config/GitHubPluginConfig.java
Comment on lines 87 to +88
getConfigFile().getXStream().alias("github-server-config", GitHubServerConfig.class);
getConfigFile().getXStream().alias(GITHUB_PLUGIN_CONFIGURATION_ID, GitHubPluginConfig.class);
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Though the actual problem is that load() is called in the constructor it looks like a too involved fix to make that right. Instead all aliases already have a central point where they should be made.

Suggested change
getConfigFile().getXStream().alias("github-server-config", GitHubServerConfig.class);
getConfigFile().getXStream().alias(GITHUB_PLUGIN_CONFIGURATION_ID, GitHubPluginConfig.class);
GitHubPlugin.addXStreamAliases();

And add alias("github-server-config", GitHubServerConfig.class) to org.jenkinsci.plugins.github.migration.Migrator#enableAliases instead.

@rsandell
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So the actual root cause of the problem we have seen internally is that there is a mechanism that calls Jenkins.getRootUrl() very early in the Jenkins startup sequence. Even before InitMilestone.SYSTEM_CONFIG_LOADED. And that is unraveling to load all extensions including GitHubPluginConfig for cing the configuration to be loaded too early. So org.jenkinsci.plugins.github.GitHubPlugin#addXStreamAliases won't have been called yet before the config is trying to be loaded.
But fixing that might have other consequences that we can't see now.

@vwagh-dev vwagh-dev marked this pull request as ready for review March 12, 2025 08:48
@vwagh-dev
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Found the actual root cause & fixed it there only.

@vwagh-dev vwagh-dev closed this Mar 12, 2025
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