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NullPointerException in EMF code [message #507418]

Wed, 13 January 2010 12:35

Robert Wloch

Messages: 109
Registered: July 2009

Senior Member

Hi

I'm about to write unit tests for my EMF code and one of my tests failed with a NullPointerException in EMF code. The NPE is reproducible with this little sample code:

    public static void main(String[] args) {
        Registry registry = TransactionalEditingDomain.Registry.INSTANCE;
        if (registry == null) {
            System.out.println("no registry available");
        } else {
            System.out.println("registry available");
            TransactionalEditingDomain editingDomain = registry.getEditingDomain("my.sharedEditingDomain");
            if (editingDomain == null) {
                System.out.println("no editing domain available");
            } else {
                System.out.println("editing domain available");
            }
        }
    }

The output with stacktrace is:

registry available
Exception in thread "main" java.lang.NullPointerException
    at org.eclipse.emf.transaction.internal.EMFTransactionPlugin.getPluginId(EMFTransactionPlugin.java:62)
    at org.eclipse.emf.transaction.impl.EditingDomainManager.getDomainConfig(EditingDomainManager.java:222)
    at org.eclipse.emf.transaction.impl.EditingDomainManager.createEditingDomain(EditingDomainManager.java:91)
    at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl$RegistryImpl.getEditingDomain(TransactionalEditingDomainImpl.java:1218)
    at Test.main(TestBrowserUtil.java:14)

Now I know, that the extension point for editing domains can't be read by the registry when not running inside of Eclipse. But since the registry object is not null its add(id, editingDomain) method suggests that I could add a missing editing domain programmatically. However, as there's no way to check if an id is already registered the only way to find out is by calling getEditingDomain(id). That however, will cause the NullPointerException.

Is this something I really should not do at all? Should I file it as a bug?

Regards
Rob

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Re: NullPointerException in EMF code [message #507460 is a reply to message #507418]

Wed, 13 January 2010 15:00

Ed Merks

Messages: 33216
Registered: July 2009

Senior Member

Robert,

Comments below.

Robert Wloch wrote:
> Hi
>
> I'm about to write unit tests for my EMF code and one of my tests
> failed with a NullPointerException in EMF code. The NPE is
> reproducible with this little sample code:
I think you use do a plugin JUnit test.
>
> public static void main(String[] args) {
> Registry registry = TransactionalEditingDomain.Registry.INSTANCE;
> if (registry == null) {
> System.out.println("no registry available");
> } else {
> System.out.println("registry available");
> TransactionalEditingDomain editingDomain =
> registry.getEditingDomain("my.sharedEditingDomain");
> if (editingDomain == null) {
> System.out.println("no editing domain available");
> } else {
> System.out.println("editing domain available");
> }
> }
> }
>
>
> The output with stacktrace is:
>
> registry available
> Exception in thread "main" java.lang.NullPointerException
> at
> org.eclipse.emf.transaction.internal.EMFTransactionPlugin.ge tPluginId(EMFTransactionPlugin.java:62)
>
> at
> org.eclipse.emf.transaction.impl.EditingDomainManager.getDom ainConfig(EditingDomainManager.java:222)
>
> at
> org.eclipse.emf.transaction.impl.EditingDomainManager.create EditingDomain(EditingDomainManager.java:91)
>
> at
> org.eclipse.emf.transaction.impl.TransactionalEditingDomainI mpl$RegistryImpl.getEditingDomain(TransactionalEditingDomain Impl.java:1218)
>
> at Test.main(TestBrowserUtil.java:14)
>
>
> Now I know, that the extension point for editing domains can't be read
> by the registry when not running inside of Eclipse. But since the
> registry object is not null its add(id, editingDomain) method suggests
> that I could add a missing editing domain programmatically. However,
> as there's no way to check if an id is already registered the only way
> to find out is by calling getEditingDomain(id). That however, will
> cause the NullPointerException.
>
> Is this something I really should not do at all? Should I file it as a
> bug?
I don't think the transactional framework can generally work without a
workspace and you can't have a workspace running standalone.
>
> Regards
> Rob

Ed Merks
Professional Support: https://www.macromodeling.com/

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