Index: model/org/eclipse/jdt/internal/core/builder/State.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/builder/State.java,v
retrieving revision 1.60
diff -u -r1.60 State.java
--- model/org/eclipse/jdt/internal/core/builder/State.java	16 Mar 2007 18:28:59 -0000	1.60
+++ model/org/eclipse/jdt/internal/core/builder/State.java	16 May 2007 15:33:20 -0000
@@ -66,10 +66,17 @@
 	this.typeLocators = new SimpleLookupTable(7);
 
 	this.buildNumber = 0; // indicates a full build
-	this.lastStructuralBuildTime = System.currentTimeMillis();
+	this.lastStructuralBuildTime = computeStructuralBuildTime(javaBuilder.lastState == null ? 0 : javaBuilder.lastState.lastStructuralBuildTime);
 	this.structuralBuildTimes = new SimpleLookupTable(3);
 }
 
+long computeStructuralBuildTime(long previousTime) {
+	long newTime = System.currentTimeMillis();
+	if (newTime <= previousTime)
+		newTime = previousTime + 1;
+	return newTime;
+}
+
 void copyFrom(State lastState) {
 	this.knownPackageNames = null;
 	this.previousStructuralBuildTime = lastState.previousStructuralBuildTime;
@@ -354,7 +361,7 @@
 void tagAsStructurallyChanged() {
 	this.previousStructuralBuildTime = this.lastStructuralBuildTime;
 	this.structurallyChangedTypes = new StringSet(7);
-	this.lastStructuralBuildTime = System.currentTimeMillis();
+	this.lastStructuralBuildTime = computeStructuralBuildTime(this.previousStructuralBuildTime);
 }
 
 boolean wasStructurallyChanged(IProject prereqProject, State prereqState) {