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Validation Errors and Rollback
A common use case is to rollback a transaction if there are validation errors. For example consider this service:

import grails.validation.ValidationException
class AuthorService {

    void updateAge(id, int age) {
        def author = Author.get(id)
        author.age = age
        if (!author.validate()) {

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jQuery(document).ready(function() {
  // Handler for .ready() called.
});

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-XX:MaxPermSize=512m -Xmx4096m

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public Map generateAssignments(List<String> participants) {
  
    def assignees = participants.clone()
    Collections.shuffle(participants)
    Collections.shuffle(assignees)
    def assignments = [:]
    
    participants.each { participant ->
        def assignee = assignees.find{ it != participant}
        assignments[assignee] = participant

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export JAVA_OPTS="-XX:MaxPermSize=512m" 

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CREATE DATABASE dbname CHARACTER SET utf8 COLLATE utf8_general_ci;

or

CREATE DATABASE dbname CHARACTER SET utf8 COLLATE utf8_bin;

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def countRows = db.firstRow("select count(*) as numberOfRows from languages")
assert 4 == countRows.numberOfRows

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// A form with associated inputs
<g:form action="seed">

 <g:each in="${teams}" status="i" var="team">

   <input type="hidden" name="teams.${i}.id" value="${team.id}">

   <input type="text" size="2" name="teams.${i}.seed" value="${team.seed}">

  </g:each>

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git push -u origin your_branch

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 def errorMessages = ex.errors.collect { g.message(error:it) }