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[Cdt-launch-inbox] [Bug 236847] New: Debug launching of non-buildable project in CDT 4 may fail 
https://bugs.eclipse.org/bugs/show_bug.cgi?id=236847  
Product/Component: CDT / cdt-launch
           Summary: Debug launching of non-buildable project in CDT 4 may
                    fail
           Product: CDT
           Version: 4.0.3
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: cdt-launch
        AssignedTo: cdt-launch-inbox@xxxxxxxxxxx
        ReportedBy: dorascatalin@xxxxxxxxx


Build ID: M20080221-1800

Steps To Reproduce:
1. Create a CDT project that you have no intention to rebuild, and also doesn't
have any support for build included (we don't have a makefile).
The project is a new C or C++ project -> Makefile Project and a selected
toolchain.

2. Leave the check-box 
"Build (if required) before launching" checked at 
Window->Preferences->Run/Debug->Launching

3. When trying to launch a debug session you will get a NullPointerException
java.lang.NullPointerException
        at
org.eclipse.cdt.launch.AbstractCLaunchDelegate.setBuildConfiguration(AbstractCLaunchDelegate.java:565)
        at
org.eclipse.cdt.launch.AbstractCLaunchDelegate.buildForLaunch(AbstractCLaunchDelegate.java:541)
        at
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:727)
        at
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:608)
        at
org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:899)
        at
org.eclipse.debug.internal.ui.DebugUIPlugin$7.run(DebugUIPlugin.java:1102)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
so you can not continue with the launch process


More information:
In org.eclipse.cdt.launch.AbstractCLaunchDelegate.setBuildConfiguration() we
have the code:

if (buildConfigID.length() > 0 && projDes != null)
{
        ICConfigurationDescription buildConfiguration =
projDes.getConfigurationById(buildConfigID);
        buildConfiguration.setActive();
        CDTPropertyManager.performOk(null);
}

buildConfiguration here is still null after the initialization in our case, so
we get a NullPointerException.

In order to fix this issue, we only do another check on the buildConfiguration
variable

if (buildConfigID.length() > 0 && projDes != null)
{
        ICConfigurationDescription buildConfiguration =
projDes.getConfigurationById(buildConfigID);
        // Added code: check if not null.
        if (buildConfiguration != null){
                buildConfiguration.setActive();
                CDTPropertyManager.performOk(null);
        }
}


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