diff --git a/ds/org.eclipse.pde.ds.annotations/src/org/eclipse/pde/ds/internal/annotations/DSAnnotationVersion.java b/ds/org.eclipse.pde.ds.annotations/src/org/eclipse/pde/ds/internal/annotations/DSAnnotationVersion.java
index 2f7615525f..5079b36c07 100644
--- a/ds/org.eclipse.pde.ds.annotations/src/org/eclipse/pde/ds/internal/annotations/DSAnnotationVersion.java
+++ b/ds/org.eclipse.pde.ds.annotations/src/org/eclipse/pde/ds/internal/annotations/DSAnnotationVersion.java
@@ -33,7 +33,7 @@ public enum DSAnnotationVersion {
 	public static final DSAnnotationVersion DEFAULT_VERSION = DSAnnotationVersion.V1_4;
 
 	private final String namespace;
-	private String version;
+	private final String version;
 
 	private DSAnnotationVersion(String version, String namespace) {
 		this.version = version;
diff --git a/ds/org.eclipse.pde.ds.annotations/src/org/eclipse/pde/ds/internal/annotations/ProjectClasspathPreferenceChangeListener.java b/ds/org.eclipse.pde.ds.annotations/src/org/eclipse/pde/ds/internal/annotations/ProjectClasspathPreferenceChangeListener.java
index 5eb5e13d30..286824da34 100644
--- a/ds/org.eclipse.pde.ds.annotations/src/org/eclipse/pde/ds/internal/annotations/ProjectClasspathPreferenceChangeListener.java
+++ b/ds/org.eclipse.pde.ds.annotations/src/org/eclipse/pde/ds/internal/annotations/ProjectClasspathPreferenceChangeListener.java
@@ -45,6 +45,7 @@ public ProjectClasspathPreferenceChangeListener(IJavaProject project) {
 		ResourcesPlugin.getWorkspace().addResourceChangeListener(this, IResourceChangeEvent.PRE_CLOSE | IResourceChangeEvent.PRE_DELETE);
 	}
 
+	@Override
 	public void preferenceChange(PreferenceChangeEvent event) {
 	}