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Home » Eclipse Projects » Buckminster » Resolution problems with Indigo: NPE in EclipsePlatformReaderType.getBestPlugin
Resolution problems with Indigo: NPE in EclipsePlatformReaderType.getBestPlugin [message #903047] Tue, 21 August 2012 18:06 Go to next message
Nicolas Rouquette is currently offline Nicolas RouquetteFriend
Messages: 146
Registered: July 2009
Senior Member
I've managed to do a few buckminster builds but I'm getting an error that puzzles me:

!ENTRY org.eclipse.core.jobs 4 2 2012-08-21 10:32:48.862
!MESSAGE An internal error occurred during: "getting resolutions".
!STACK 0
java.lang.NullPointerException
	at org.eclipse.buckminster.pde.internal.EclipsePlatformReaderType.getBestPlugin(EclipsePlatformReaderType.java:85)
	at org.eclipse.buckminster.pde.internal.EclipsePlatformReader.getBestPlugin(EclipsePlatformReader.java:310)
	at org.eclipse.buckminster.pde.internal.EclipsePlatformReader.getPluginModelBase(EclipsePlatformReader.java:165)
	at org.eclipse.buckminster.pde.cspecgen.bundle.BundleBuilder.parsePluginModelBase(BundleBuilder.java:119)
	at org.eclipse.buckminster.pde.cspecgen.bundle.BundleBuilder.parseFile(BundleBuilder.java:269)
	at org.eclipse.buckminster.pde.cspecgen.PDEBuilder.build(PDEBuilder.java:70)
	at org.eclipse.buckminster.core.resolver.LocalResolver.localResolve(LocalResolver.java:339)
	at org.eclipse.buckminster.core.metadata.WorkspaceInfo.resolveLocal(WorkspaceInfo.java:610)
	at org.eclipse.buckminster.core.metadata.WorkspaceInfo.getResolution(WorkspaceInfo.java:465)
	at org.eclipse.buckminster.core.metadata.WorkspaceInfo.getResolution(WorkspaceInfo.java:412)
	at org.eclipse.buckminster.core.metadata.WorkspaceInfo.getAllResolutions(WorkspaceInfo.java:186)
	at org.eclipse.buckminster.ui.providers.ResolutionsTreeContentProvider$AllResolutionsNode.createNode(ResolutionsTreeContentProvider.java:52)
	at org.eclipse.buckminster.generic.model.tree.PendingTreeDataNode$1.run(PendingTreeDataNode.java:52)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)


I have taken a look at the source code (Buckminster indigo branch from git) and noticed the following:

	public static IPluginModelBase getBestPlugin(String componentName, VersionRange versionDesignator, NodeQuery query) {
		IPluginModelBase candidate = null;
		Version candidateVersion = null;
		synchronized (activeMap) {
			if (activeMap.isEmpty()) {
				for (IPluginModelBase model : PluginRegistry.getAllModels()) {
					BundleDescription desc = model.getBundleDescription();
					String id = desc.getSymbolicName(); // line 85
					IPluginModelBase[] mbArr = activeMap.get(id);
					if (mbArr == null)
						mbArr = new IPluginModelBase[] { model };
					else {
						IPluginModelBase[] newArr = new IPluginModelBase[mbArr.length + 1];
						System.arraycopy(mbArr, 0, newArr, 0, mbArr.length);
						newArr[mbArr.length] = model;
						mbArr = newArr;
					}
					activeMap.put(id, mbArr);
				}
			}
...


The NPE at line 85 is understandable: getBundleDescription() may be null for some subtypes of IPluginModelBase.

FragmentModel => always null.
WorkspaceBundleFragmentModel and WorkspaceBundlePluginModel => null unless setBundleDescription() has been previously called with a non-null value.

Is this a bug in the buckminster/indigo release?

- Nicolas.

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Re: Resolution problems with Indigo: NPE in EclipsePlatformReaderType.getBestPlugin [message #903049 is a reply to message #903047] Tue, 21 August 2012 18:20 Go to previous messageGo to next message
Nicolas Rouquette is currently offline Nicolas RouquetteFriend
Messages: 146
Registered: July 2009
Senior Member
I experimented with a simple patch which seems to work for me.
To be sure, I have to create a proper patch feature with the change below, install it and see if it will work in the environment where I experienced the NPE.

diff --git a/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java b/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
index ec8cfdd..d7003e5 100644
--- a/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
+++ b/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
@@ -82,6 +82,8 @@
 			if (activeMap.isEmpty()) {
 				for (IPluginModelBase model : PluginRegistry.getAllModels()) {
 					BundleDescription desc = model.getBundleDescription();
+					if (desc == null)
+						continue;
 					String id = desc.getSymbolicName();
 					IPluginModelBase[] mbArr = activeMap.get(id);
 					if (mbArr == null)


- Nicolas.

Report message to a moderator

Re: Resolution problems with Indigo: NPE in EclipsePlatformReaderType.getBestPlugin [message #903117 is a reply to message #903049] Wed, 22 August 2012 06:07 Go to previous messageGo to next message
Thomas Hallgren is currently offline Thomas HallgrenFriend
Messages: 3234
Registered: July 2009
Senior Member
Hi Nicolas,

If you get it working OK, could you please enter a bugzilla and attach the patch there?

TIA,
- thomas

On 2012-08-21 20:20, Nicolas Rouquette wrote:
> I experimented with a simple patch which seems to work for me.
> To be sure, I have to create a proper patch feature with the change below, install it and see if it will work in the
> environment where I experienced the NPE.
>
>
> diff --git a/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
> b/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
> index ec8cfdd..d7003e5 100644
> --- a/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
> +++ b/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
> @@ -82,6 +82,8 @@
> if (activeMap.isEmpty()) {
> for (IPluginModelBase model : PluginRegistry.getAllModels()) {
> BundleDescription desc = model.getBundleDescription();
> + if (desc == null)
> + continue;
> String id = desc.getSymbolicName();
> IPluginModelBase[] mbArr = activeMap.get(id);
> if (mbArr == null)
>
>
> - Nicolas.

Report message to a moderator

Re: Resolution problems with Indigo: NPE in EclipsePlatformReaderType.getBestPlugin [message #903121 is a reply to message #903117] Wed, 22 August 2012 06:35 Go to previous message
Thomas Hallgren is currently offline Thomas HallgrenFriend
Messages: 3234
Registered: July 2009
Senior Member
Never mind. I found it. Thanks a lot.

https://bugs.eclipse.org/bugs/show_bug.cgi?id=387739

- thomas

On 2012-08-22 08:07, Thomas Hallgren wrote:
> Hi Nicolas,
>
> If you get it working OK, could you please enter a bugzilla and attach the patch there?
>
> TIA,
> - thomas
>
> On 2012-08-21 20:20, Nicolas Rouquette wrote:
>> I experimented with a simple patch which seems to work for me.
>> To be sure, I have to create a proper patch feature with the change below, install it and see if it will work in the
>> environment where I experienced the NPE.
>>
>>
>> diff --git a/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
>> b/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
>> index ec8cfdd..d7003e5 100644
>> --- a/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
>> +++ b/org.eclipse.buckminster.pde/src/java/org/eclipse/buckminster/pde/internal/EclipsePlatformReaderType.java
>> @@ -82,6 +82,8 @@
>> if (activeMap.isEmpty()) {
>> for (IPluginModelBase model : PluginRegistry.getAllModels()) {
>> BundleDescription desc = model.getBundleDescription();
>> + if (desc == null)
>> + continue;
>> String id = desc.getSymbolicName();
>> IPluginModelBase[] mbArr = activeMap.get(id);
>> if (mbArr == null)
>>
>>
>> - Nicolas.
>

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