Build: NetBeans IDE 8.0.2 (Build 201411181905)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.31-b07, Java(TM) SE Runtime Environment, 1.8.0_31-b13
OS: Mac OS X

User Comments:
GUEST: Attaching debugger.

sworisbreathing: I was trying to debug an integration test in a Gradle project.

GUEST: Whats going on?

GUEST: Trying to atach debugger

sworisbreathing: I was trying to debug a JUnit integration test in a Maven 3 project.

Maven 3.0.3, JUnit 4.11, the test class' name is suffixed with "IT" and I've got the failsafe plugin configured in pom.xml.  I ran the test by opening up the test file and using NetBeans' "Debug->Debug Test File" menu.
After reporting the error, NetBeans locked up and I had to kill the process through task manager.
Happened again after relaunching NetBeans and trying to debug an integration test.

Since this issue appears to be related to NetBeans figuring out where project sources are during debugging, I'll mentions this.  I have a logback.groovy under src/test/groovy and I'm adding it as a test source using build-helper-maven-plugin during the generate-test-sources phase like so:

<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>build-helper-maven-plugin</artifactId>
  <version>1.7</version>
  <executions>
    <execution>
      <phase>generate-test-sources</phase>
      <goals>
        <goal>add-test-source</goal>                            
      </goals>
      <configuration>
        <sources>
          <source>src/test/groovy/logback.groovy</source>
        </sources>
      </configuration>
    </execution>
  </executions>
</plugin>
In my case, the issue is being caused by a bad configuration of build-helper-maven-plugin, which I just posted.  The description of that particular goal at http://mojo.codehaus.org/build-helper-maven-plugin/add-test-source-mojo.html says "Add test source directories to the POM."  Changing the source path to `src/test/groovy` fixed my problem.

GUEST: Trying to debug on jboss server using attach.

GUEST: Fucking error!

GUEST: when attaching debugger

GUEST: Still trying to debug!

GUEST: Whats going on with this?




Stacktrace: 
java.lang.IllegalStateException: No instance created for service org.netbeans.modules.debugger.jpda.actions.StepIntoActionProvider, context = Lookup.Compound@37a1c427[l1=Lookup.Compound@6e36a244[l1=Lookup.Compound@62d43eb[l1=org.netbeans.api.debugger.Lookup$Instance@1202d5ed, l2=Lookup.MetaInf@63d3c633[rootFolder=netbeans-jpda-AttachingDICookie]], l2=Lookup.Compound@38ac7c8f[l1=org.netbeans.api.debugger.Lookup$Instance@54f2426a, l2=Lookup.MetaInf@505b48a4[rootFolder=netbeans-JPDASession]]], l2=Lookup.Compound@2dc4eec2[l1=org.netbeans.api.debugger.Lookup$Instance@7657b7f1, l2=Lookup.MetaInf@30f04a43[rootFolder=netbeans-JPDASession/Java]]], path = Debugger/netbeans-JPDASession/org-netbeans-modules-debugger-jpda-actions-StepIntoActionProvider.instance
   at org.netbeans.spi.debugger.ActionsProvider$ContextAware.getDelegate(ActionsProvider.java:221)
   at org.netbeans.spi.debugger.ActionsProvider$ContextAware.isEnabled(ActionsProvider.java:268)
   at org.netbeans.api.debugger.ActionsManager.isEnabled(ActionsManager.java:313)
   at org.netbeans.modules.debugger.ui.actions.DebuggerAction.isEnabled(DebuggerAction.java:129)
   at org.netbeans.modules.debugger.ui.actions.DebuggerAction.access$000(DebuggerAction.java:73)
   at org.netbeans.modules.debugger.ui.actions.DebuggerAction$Listener.propertyChange(DebuggerAction.java:395)