Grails LinkageError for SAXParseException

I ran "grails run-app" for the app that I've been working on and was greeted with the following :

java.lang.LinkageError: loader constraint violation: loader (instance of <bootlo
ader>) previously initiated loading for a different type with name "org/xml/sax/
SAXParseException"
   at java.lang.Class.getDeclaredMethods0(Native Method)
   at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
   at java.lang.Class.getDeclaredMethods(Class.java:1791)
   at java.security.AccessController.doPrivileged(Native Method)
   at org.codehaus.groovy.util.LazyReference.getLocked(LazyReference.java:4
6)
   at org.codehaus.groovy.util.LazyReference.get(LazyReference.java:33)
   at grails.util.PluginBuildSettings.getPluginInfos(PluginBuildSettings.gr
oovy:127)
   at grails.util.PluginBuildSettings.getPluginInfos(PluginBuildSettings.gr
oovy)
   at grails.util.PluginBuildSettings$getPluginInfos.callCurrent(Unknown So
urce)
   at grails.util.PluginBuildSettings.getPluginInfo(PluginBuildSettings.gro
ovy:164)
   at grails.util.PluginBuildSettings$getPluginInfo.callCurrent(Unknown Sou
rce)
   at grails.util.PluginBuildSettings.getPluginInfoForSource(PluginBuildSet
tings.groovy:202)
   at org.codehaus.groovy.transform.ASTTransformationVisitor$3.call(ASTTran
sformationVisitor.java:303)
   at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(Compil
ationUnit.java:832)
   at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(Compilat
ionUnit.java:519)
   at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(Co
mpilationUnit.java:495)
   at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.j
ava:472)
   at _GrailsEvents_groovy.run(_GrailsEvents_groovy:54)
   at _GrailsEvents_groovy$run.call(Unknown Source)
   at _GrailsClean_groovy$run.call(Unknown Source)
   at _GrailsClean_groovy.run(_GrailsClean_groovy:29)
   at _GrailsClean_groovy$run.call(Unknown Source)
$
   at _GrailsPlugins_groovy.run(_GrailsPlugins_groovy:32)
   at _GrailsPlugins_groovy$run.call(Unknown Source)
   at _GrailsRun_groovy$run.call(Unknown Source)
   at _GrailsRun_groovy.run(_GrailsRun_groovy:31)
   at _GrailsRun_groovy$run.call(Unknown Source)
   at RunApp.run(RunApp.groovy:25)
   at RunApp$run.call(Unknown Source)
   at gant.Gant.prepareTargets(Gant.groovy:606)
Error loading event script from file [PATH_TO_GRAILS\.grails
\1.3.1\projects\PROJECT_NAME\plugins\code-coverage-1.1.8\scripts\_Events.gr
oovy] loader constraint violation: loader (instance of <bootloader>) previously
initiated loading for a different type with name "org/xml/sax/SAXParseException"

Grails had done some sort of update that I didn't pay a lot of attention to. I wondered if this had something to do with the update and will have to find out what went on later.

I found an entry on the Grails Jira dealing with the problem of xerces and Java 6. The suggested solution was to remove xml-apis-1.0.2.b2.jar.

I ran :

find . -name "*xml*"
find . -name "*api*"

from my project directory, my .grails directory and my .ivy directory. I found xml-apis-1.3.04.jar in my .ivy directory.

I ran jarscan against my project directory, .grails directory and .ivy directory and found 0 hits for SAXParseException.

I added :

    inherits("global") {
      excludes "xml-apis"
  }

To my BuildConfig.groovy file just below dependencies. The app ran.

Changing form actions with jQuery

I'm working on a simple cms in a side project. Naturally I have a page where administrators can create new web pages.

I'm using the jQuery version of TinyMCE for editing. It is worth a look if you need wysiwyg textarea editing.

I wanted to give my client the ability to preview the page before saving it. The solution was simple: change the form's action in the click handler.

The implementation eluded me for a while; although, it was completely obvious:

                $("#preview").click(function(event){
                   event.preventDefault();
                   $("#create_page_form").attr( "action", "/preview_page" );
                   $("#create_page_form").submit();
               });

               $("#submit").click(function(event){
                   event.preventDefault();
                   $("#create_page_form").attr( "action", "/create_page" );
                   $("#create_page_form").submit();
               });

"#preview" and "#submit" are the ids of two links but could be buttons.

I thought I would post it in the event that anyone else Google's "jQuery change form action."

SHIFT : q

No matter what text editor I'm in I can't help but typing "SHIFT :" followed by "q".

Does that happen to anyone else?

groovy.lang.MissingMethodException: No signature of method: static .list() is applicable for argument types:

I've started using Grails recently. Its really nice. Productive, easy to get up and running, etc.

My first stab at testing a Controller produced :

groovy.lang.MissingMethodException: No signature of method: static dbtestapp.Team.list() is applicable for argument types:
(org.codehaus.groovy.grails.web.taglib.GroovyPageAttributes) values: [[max:10]]
Possible solutions: is(java.lang.Object), wait(), wait(long), print(java.lang.Object), split(groovy.lang.Closure), use([Ljava.lang.Object;)
at dbtestapp.TeamController$_closure2.doCall

A little weird. list() is a dynamic method and should be on the object.

Its a known issue in the Grails Jira. The solution is to stick the test inside the "integration" package.

Ubuntu slow internet connection

I'm running Ubuntu Karmic Koala on a Dell Latitude D620. I've had a pretty tough time with wireless. Broadcom's support for Linux is terrible.

Yesterday my browsers became ridiculously slow. Running "ping" or "host" from Konsole showed that the problem wasn't networking.

I found a few posts suggesting that I disable IPv6 and reboot. I created a file "/etc/modprobe.d/bad_list", added "alias net-pf-10 off" and rebooted. Much better.

I was on another machine and don't have links to the actual posts from Linux forums and Ubuntu's forums. My apologies to the solution's authors.

java.lang.ClassNotFoundException: org.codehaus.groovy.transform.powerassert.ValueRecorder

Running a GroovyTestCase in a new project I got the following :

java.lang.NoClassDefFoundError: org/codehaus/groovy/transform/powerassert/ValueRecorder
   at [My Package Hierarchy].[My TestCase].[My Test Method]([My Test Case].groovy:29)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at junit.framework.TestCase.runTest(TestCase.java:168)
   at junit.framework.TestCase.runBare(TestCase.java:134)
   at junit.framework.TestResult$1.protect(TestResult.java:110)
   at junit.framework.TestResult.runProtected(TestResult.java:128)
   at junit.framework.TestResult.run(TestResult.java:113)
   at junit.framework.TestCase.run(TestCase.java:124)
   at junit.framework.TestSuite.runTest(TestSuite.java:232)
   at junit.framework.TestSuite.run(TestSuite.java:227)
   at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:79)
   at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.ClassNotFoundException: org.codehaus.groovy.transform.powerassert.ValueRecorder
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
   ... 20 more

I found a bug that was closed because it couldn't be reproduced in the Groovy Eclipse JIRA.

I had run GroovyTestCases in other projects without this problem.

I right clicked the project and chose "Groovy -> Add Groovy libs to Classpath." That fixed it.

I had added my own Groovy library instead of the plugins. I often point Eclipse Libraries to the jar files in my .m2 directory. The "org.codehaus.groovy.transform.powerassert" package was not part of the Groovy distro. It is part of Groovy Eclipse plugin.

Another cool NetBeans theme

I really like a dark background in my IDE. I previously mentioned the Aloha theme for NetBeans. I've been using if for a while.

Yesterday I found a version of Twilight for NetBeans. This one is set up for PHP, but works pretty well for Python. It is tweakable of course too.