<p>In the grails-framework some objects are using log. This is normally injected by grails. It works on execution of <code>grails test-app</code>. But the same test (an integration-test) fails on execution of <code>grails test-app -integration</code>.</p>

<p>What goes wrong here and can I force the injection of the log-object somehow?</p>

What version of grails are you using?  It's working fine for both situations for me on 1.0.4 (the latest).
I create a new blank app and created a service class with an integration test:
FooService.groovy:
```
```
class FooService {
    def logSomething(message) {
        log.error(message)
        return true
    }
}
```
```
FooServiceTests.groovy:
```
```
class FooServiceTests extends GroovyTestCase {
    def fooService
    void testSomething() {
    assert fooService.logSomething("it works")
    }
}
```
```
When running just test-app, I get the log message:
```
```
% grails test-app             

Welcome to Grails 1.0.4 - http://grails.org/
....
-------------------------------------------------------
Running 1 Integration Test...
Running test FooServiceTests...
                        testSomething...[4174] service.FooService it works
SUCCESS
Integration Tests Completed in 440ms
-------------------------------------------------------
...
```
```
When running only integration tests, it also works:
```
```
% grails test-app -integration

Welcome to Grails 1.0.4 - http://grails.org/
....
-------------------------------------------------------
Running 1 Integration Test...
Running test FooServiceTests...
                    testSomething...[4444] service.FooService it works
SUCCESS
Integration Tests Completed in 481ms
-------------------------------------------------------
....
```
```
Are you munging around with the logger class (or overriding any metaclass stuff on the logger, in any previous integration classes or unit tests and not then re-initializing the metaClass?