[groovy-user] Groovy/grails unit testing with IntelliJ IDEA: java.lang.NullPointerException: Cannot invoke method methodName()
ahoegh
Hi,
Comming from an ASP.NET MVC background, im currently trying to get a hold of
the capabilities of Groovy/Grails and it seems very promissing - but I
encounter a problem trying to do my first tests using IntelliJ IDEA 8.1.3.
The problem seems to be that when I define a variable with a name like
"quoteService" in my unit test, the relationship to "QuoteService" is not
inferred and thus, I get a java.lang.NullPointerException for trying to run
a method on a null object. In my QuoteController, however, I can easily
define a variable named "quoteService" and have Grails sort out the
relationship to the "QuoteService". (Note: I base my examples on the "Grails
In Action" book which I find usefull for those of us familar with Java
syntax, domain-driven design, the MVC pattern and so on..)
I suppose this is a configuration issue, but I have been searching the
internet for some time now and I can't figure how to set this up with Grails
Test or NUnit. Furthermore, I've noticed that a ".grails" folder is created
under my "Administrator" user folder in Windows and some test classes are
stored there, although my project folder is on the C:\ root.
I "projectfolder\grails-app\services":
class QuoteService {
boolean transactional = false
def getRandomQuote()
{
def quotesList = Quote.list()
def quoteRandom
def quoteCount = quotesList.size()
if (quotesList.size() > 0)
{
def randomIdx = new Random().nextInt(quotesList.size())
quoteRandom = quotesList[randomIdx]
}
return quoteRandom;
}
}
In "projectfolder\test\unit":
import grails.test.*
class QuoteServiceTests extends GrailsUnitTestCase {
def quoteService
void testgetRandomQuote()
{
def randomQuote = quoteService.getRandomQuote()
assertNotNull(randomQuote)
}
}
The stack trace when running the test(s):
java.lang.NullPointerException: Cannot invoke method getRandomQuote() on
null object
at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77)
at
org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:750)
at
org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:727)
at
org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:17)
at
org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
at
org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
at
org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:121)
at
QuoteServiceIntegrationTests.testRandomQuote(QuoteServiceIntegrationTests.groovy:16)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)
Process finished with exit code -1
Any help will be appreciated.
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Roger Studner
do not get any dependency injection.
Put the test beneath 'integration' and you'll have better luck.
Note, running 'tests' from inside intellij is *very slow* for
integration tests.. as well it will throw some exceptions.. just wait
them out, it will eventually work.
Roger