spring - "Error loading plugin manager: TomcatGrailsPlugin" on Grails 2.3 Database Migration

Question

I use Grails 2.3 and the Grails database migration plugin (1.3.6).

When I do grails dbm-update I get the following error. How can I solve this error?

 Error Error loading plugin manager: TomcatGrailsPlugin (NOTE: Stack trace has been filtered. Use --verbose to see entire trace.)
java.lang.ClassNotFoundException: TomcatGrailsPlugin
    at _GrailsBootstrap_groovy$_run_closure2.doCall(_GrailsBootstrap_groovy:40)
    at org.codehaus.gant.GantMetaClass.invokeMethod(GantMetaClass.java:133)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16_closure18.doCall(GantBinding.groovy:185)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16_closure18.doCall(GantBinding.groovy)
    at org.codehaus.gant.GantBinding.withTargetEvent(GantBinding.groovy:90)
    at org.codehaus.gant.GantBinding.this$4$withTargetEvent(GantBinding.groovy)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16.doCall(GantBinding.groovy:185)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16.doCall(GantBinding.groovy)
    at org.codehaus.gant.GantMetaClass.invokeMethod(GantMetaClass.java:133)
    at _GrailsBootstrap_groovy$_run_closure6.doCall(_GrailsBootstrap_groovy:64)
    at org.codehaus.gant.GantMetaClass.invokeMethod(GantMetaClass.java:133)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16_closure18.doCall(GantBinding.groovy:185)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16_closure18.doCall(GantBinding.groovy)
    at org.codehaus.gant.GantBinding.withTargetEvent(GantBinding.groovy:90)
    at org.codehaus.gant.GantBinding.this$4$withTargetEvent(GantBinding.groovy)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16.doCall(GantBinding.groovy:185)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16.doCall(GantBinding.groovy)
    at org.codehaus.gant.GantMetaClass.processClosure(GantMetaClass.java:81)
    at org.codehaus.gant.GantMetaClass.processArgument(GantMetaClass.java:95)
    at org.codehaus.gant.GantMetaClass.invokeMethod(GantMetaClass.java:128)
    at _DatabaseMigrationCommon_groovy$_run_closure1.doCall(_DatabaseMigrationCommon_groovy:25)
    at org.codehaus.gant.GantMetaClass.invokeMethod(GantMetaClass.java:133)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16_closure18.doCall(GantBinding.groovy:185)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16_closure18.doCall(GantBinding.groovy)
    at org.codehaus.gant.GantBinding.withTargetEvent(GantBinding.groovy:90)
    at org.codehaus.gant.GantBinding.this$4$withTargetEvent(GantBinding.groovy)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16.doCall(GantBinding.groovy:185)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16.doCall(GantBinding.groovy)
    at org.codehaus.gant.GantMetaClass.processClosure(GantMetaClass.java:81)
    at org.codehaus.gant.GantMetaClass.processArgument(GantMetaClass.java:95)
    at org.codehaus.gant.GantMetaClass.invokeMethod(GantMetaClass.java:128)
    at DbmUpdate$_run_closure1.doCall(DbmUpdate:23)
    at org.codehaus.gant.GantMetaClass.invokeMethod(GantMetaClass.java:133)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16_closure18.doCall(GantBinding.groovy:185)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16_closure18.doCall(GantBinding.groovy)
    at org.codehaus.gant.GantBinding.withTargetEvent(GantBinding.groovy:90)
    at org.codehaus.gant.GantBinding.this$4$withTargetEvent(GantBinding.groovy)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16.doCall(GantBinding.groovy:185)
    at org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16.doCall(GantBinding.groovy)
    at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy)
    at gant.Gant.withBuildListeners(Gant.groovy:427)
    at gant.Gant.this$2$withBuildListeners(Gant.groovy)
    at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
    at gant.Gant.dispatch(Gant.groovy:415)
    at gant.Gant.this$2$dispatch(Gant.groovy)
    at gant.Gant.invokeMethod(Gant.groovy)
    at gant.Gant.executeTargets(Gant.groovy:591)
    at gant.Gant.executeTargets(Gant.groovy:590)
| Error Error loading plugin manager: TomcatGrailsPlugin

Answer 1

This is a super annoying bug. My application depends on running scripts with run-script and I get the same behavior. Here's what I did as a workaround:

plugins {
    ...
    // grails 2.3.2 and tomcat 7.0.42 cause scripts to not work :( Pass -DnoTomcat=true in the script args to fix this
    if (System.getProperty("noTomcat") == null) {
        build ":tomcat:7.0.42"
    }
}

Then when running your script:

 grails -DnoTomcat=true run-script scripts/MyScript.groovy

Annoying for sure, but at least you can use all the other latest features while awaiting a fix.