[120266] Validation caching fix
diff --git a/plugins/org.eclipse.wst.validation/validate/org/eclipse/wst/validation/internal/IProjectValidationHelper.java b/plugins/org.eclipse.wst.validation/validate/org/eclipse/wst/validation/internal/IProjectValidationHelper.java
index f85fddf..f22df4f 100644
--- a/plugins/org.eclipse.wst.validation/validate/org/eclipse/wst/validation/internal/IProjectValidationHelper.java
+++ b/plugins/org.eclipse.wst.validation/validate/org/eclipse/wst/validation/internal/IProjectValidationHelper.java
@@ -18,5 +18,7 @@
 	public IContainer[] getOutputContainers(IProject project);
 	
 	public IContainer[] getSourceContainers(IProject project);
+	
+	public void disposeInstance();
 
 }
diff --git a/plugins/org.eclipse.wst.validation/validate/org/eclipse/wst/validation/internal/operations/ValidationOperation.java b/plugins/org.eclipse.wst.validation/validate/org/eclipse/wst/validation/internal/operations/ValidationOperation.java
index 3e250be..04c9bad 100644
--- a/plugins/org.eclipse.wst.validation/validate/org/eclipse/wst/validation/internal/operations/ValidationOperation.java
+++ b/plugins/org.eclipse.wst.validation/validate/org/eclipse/wst/validation/internal/operations/ValidationOperation.java
@@ -34,6 +34,7 @@
 import org.eclipse.jem.util.logger.proxy.Logger;
 import org.eclipse.wst.common.frameworks.internal.operations.IHeadlessRunnableWithProgress;
 import org.eclipse.wst.validation.internal.FilterUtil;
+import org.eclipse.wst.validation.internal.IProjectValidationHelper;
 import org.eclipse.wst.validation.internal.InternalValidatorManager;
 import org.eclipse.wst.validation.internal.ReferencialFileValidatorRegistryReader;
 import org.eclipse.wst.validation.internal.RegistryConstants;
@@ -47,6 +48,7 @@
 import org.eclipse.wst.validation.internal.core.Message;
 import org.eclipse.wst.validation.internal.core.ValidationException;
 import org.eclipse.wst.validation.internal.core.ValidatorLauncher;
+import org.eclipse.wst.validation.internal.plugin.ValidationHelperRegistryReader;
 import org.eclipse.wst.validation.internal.plugin.ValidationPlugin;
 import org.eclipse.wst.validation.internal.provisional.core.IMessage;
 import org.eclipse.wst.validation.internal.provisional.core.IReporter;
@@ -950,6 +952,9 @@
 			ValidationRegistryReader.getReader().projectValidationMetaData.clear();
 			ValidationRegistryReader.getReader().projectValidationMetaData = null;
 		}
+		IProjectValidationHelper helper = ValidationHelperRegistryReader.getInstance().getValidationHelper();
+		if (helper != null)
+			helper.disposeInstance();
 	}
 
 	private void initValidateContext(IFileDelta[] delta) {