I get this with the embedder:
[INFO] Searching repository for plugin with prefix: 'help'.
[INFO] Attempting to resolve a version for plugin:
org.apache.maven.plugins:maven-help-plugin using meta-version: LATEST
[INFO] snapshot
org.apache.maven.plugins:maven-help-plugin:2.1.1-SNAPSHOT: checking for
updates from central
[WARNING] repository metadata for: 'snapshot
org.apache.maven.plugins:maven-help-plugin:2.1.1-SNAPSHOT' could not be
retrieved from repository: central due to an error: Error transferring
file
[INFO] Repository 'central' will be blacklisted
[INFO] snapshot
org.apache.maven.plugins:maven-help-plugin:2.1.1-SNAPSHOT: checking for
updates from apache.snapshots
[INFO] Using version: 2.1.1-SNAPSHOT of plugin:
org.apache.maven.plugins:maven-help-plugin
[INFO] Scanning for projects...
[INFO] Reactor build order:
[INFO] Enforcer
[INFO] Enforcer API
[INFO] Enforcer Rules
[INFO] Maven Enforcer Plugin
[INFO] Attempting to resolve a version for plugin:
org.codehaus.plexus:plexus-maven-plugin using meta-version: LATEST
[INFO] Using version: 1.3.8 of plugin:
org.codehaus.plexus:plexus-maven-plugin
[INFO] Attempting to resolve a version for plugin:
org.codehaus.plexus:plexus-maven-plugin using meta-version: LATEST
[INFO] Using version: 1.3.8 of plugin:
org.codehaus.plexus:plexus-maven-plugin
[INFO]
------------------------------------------------------------------------
[INFO] Building Enforcer
[INFO] task-segment: [help:effective-settings] (aggregator-style)
[INFO]
------------------------------------------------------------------------
[INFO] [help:effective-settings]
[ERROR] org.apache.maven.plugins.help.EffectiveSettingsMojo#execute()
caused a linkage error (java.lang.NoSuchMethodError) and may be
out-of-date. Check the realms:
[ERROR] Plugin realm =
/plugins/org.apache.maven.plugins:maven-help-plugin:[EMAIL PROTECTED]/th
read:main
urls[0] =
file:/d:/mavenRepo/org/apache/maven/plugins/maven-help-plugin/2.1.1-SNAP
SHOT/maven-help-plugin-2.1.1-SNAPSHOT.jar
urls[1] =
file:/d:/mavenRepo/com/thoughtworks/xstream/xstream/1.3/xstream-1.3.jar
urls[2] =
file:/d:/mavenRepo/org/codehaus/plexus/plexus-utils/1.5.6/plexus-utils-1
.5.6.jar
urls[3] =
file:/d:/mavenRepo/commons-lang/commons-lang/2.4/commons-lang-2.4.jar
urls[4] = file:/d:/mavenRepo/xpp3/xpp3_min/1.1.4c/xpp3_min-1.1.4c.jar
urls[5] = file:/d:/mavenRepo/jdom/jdom/1.0/jdom-1.0.jar
urls[6] =
file:/d:/mavenRepo/org/apache/maven/plugin-tools/maven-plugin-tools-api/
2.4.3/maven-plugin-tools-api-2.4.3.jar
urls[7] =
file:/d:/mavenRepo/jtidy/jtidy/4aug2000r7-dev/jtidy-4aug2000r7-dev.jarEx
ception in thread "main" java.lang.NoSuchMethodError:
org.apache.maven.settings.Settings.getRuntimeInfo()Lorg/apache/maven/set
tings/RuntimeInfo;
at
org.apache.maven.plugins.help.EffectiveSettingsMojo.copySettings(Effecti
veSettingsMojo.java:189)
at
org.apache.maven.plugins.help.EffectiveSettingsMojo.execute(EffectiveSet
tingsMojo.java:89)
at
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginMa
nager.java:549)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandle
Failures(DefaultLifecycleExecutor.java:544)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(
DefaultLifecycleExecutor.java:225)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifec
ycleExecutor.java:149)
at
org.apache.maven.DefaultMaven.execute_aroundBody0(DefaultMaven.java:223)
at
org.apache.maven.DefaultMaven.execute_aroundBody1$advice(DefaultMaven.ja
va:304)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:1)
at
org.apache.maven.embedder.MavenEmbedder.execute_aroundBody4(MavenEmbedde
r.java:880)
at
org.apache.maven.embedder.MavenEmbedder.execute_aroundBody5$advice(Maven
Embedder.java:304)
at
org.apache.maven.embedder.MavenEmbedder.execute(MavenEmbedder.java:1)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:176)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:63)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:52)
[ERROR] Container realm = plexus.core
