improve missing builder failure case
diff --git a/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/events/BuildManager.java b/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/events/BuildManager.java
index e342431..0ea004d 100644
--- a/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/events/BuildManager.java
+++ b/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/events/BuildManager.java
@@ -70,23 +70,23 @@
 	 */

 	class MissingBuilder extends IncrementalProjectBuilder {

 		private String name;

-		private IStatus status;

+		private boolean hasBeenBuilt = false;

 		MissingBuilder(String name) {

 			this.name = name;

 		}

 		/**

-		 * Throw an exception the first time this is called, and just log subsequent attempts.

+		 * Log an exception on the first build, and silently do nothing on subsequent builds.

 		 */

 		protected IProject[] build(int kind, Map args, IProgressMonitor monitor) throws CoreException {

-			if (status == null) {

-				String msg = Policy.bind("events.missing", new String[] {name, getProject().getName()});

-				status = new Status(IStatus.WARNING, ResourcesPlugin.PI_RESOURCES, 1, msg, null);

-				throw new CoreException(status);

+			if (!hasBeenBuilt) {

+				hasBeenBuilt = true;

+				String msg = Policy.bind("events.skippingBuilder", new String[] {name, getProject().getName()});

+				IStatus status = new Status(IStatus.WARNING, ResourcesPlugin.PI_RESOURCES, 1, msg, null);

+				ResourcesPlugin.getPlugin().getLog().log(status);

 			}

-			ResourcesPlugin.getPlugin().getLog().log(status);

 			return null;

 		}

-}

+	}

 	

 public BuildManager(Workspace workspace) {

 	this.workspace = workspace;

diff --git a/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/utils/messages.properties b/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/utils/messages.properties
index 6a99228..59c0667 100644
--- a/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/utils/messages.properties
+++ b/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/utils/messages.properties
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