### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core.tests.model
Index: src/org/eclipse/jdt/core/tests/model/TestCompilationParticipant.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/TestCompilationParticipant.java,v
retrieving revision 1.2
diff -u -r1.2 TestCompilationParticipant.java
--- src/org/eclipse/jdt/core/tests/model/TestCompilationParticipant.java	27 Jun 2008 16:02:39 -0000	1.2
+++ src/org/eclipse/jdt/core/tests/model/TestCompilationParticipant.java	26 Sep 2008 09:40:47 -0000
@@ -17,7 +17,13 @@
 public class TestCompilationParticipant extends CompilationParticipant {
 
 	public static CompilationParticipant PARTICIPANT;
+	public static boolean failToInstantiate = false;
 
+	public TestCompilationParticipant() {
+		if (failToInstantiate)
+			throw new RuntimeException();
+	}
+	
 	public boolean isActive(IJavaProject project) {
 		return PARTICIPANT != null && PARTICIPANT.isActive(project);
 	}
Index: src/org/eclipse/jdt/core/tests/model/ReconcilerTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/ReconcilerTests.java,v
retrieving revision 1.140
diff -u -r1.140 ReconcilerTests.java
--- src/org/eclipse/jdt/core/tests/model/ReconcilerTests.java	9 Sep 2008 16:42:52 -0000	1.140
+++ src/org/eclipse/jdt/core/tests/model/ReconcilerTests.java	26 Sep 2008 09:40:47 -0000
@@ -3070,6 +3070,38 @@
 }
 
 /*
+ * Ensures that a misbehaving reconcile participant doesn't interfere with a reconcile operation
+ * (regression test for https://bugs.eclipse.org/bugs/show_bug.cgi?id=248680 )
+ */
+public void testReconcileParticipant12() throws CoreException {
+	try {
+		TestCompilationParticipant.failToInstantiate = true;
+		simulateExitRestart();
+		this.workingCopy = getCompilationUnit("Reconciler/src/p1/X.java").getWorkingCopy(this.wcOwner, null);
+		setWorkingCopyContents(
+			"package p1;\n" +
+			"import p2.*;\n" +
+			"public class X {\n" +
+			"  public void bar() {\n" +
+			"    System.out.println()\n" +
+			"  }\n" +
+			"}"
+		);
+		startDeltas();
+		this.workingCopy.reconcile(ICompilationUnit.NO_AST, false, null, null);
+		assertWorkingCopyDeltas(
+			"Unexpected participant delta",
+			"X[*]: {CHILDREN | FINE GRAINED}\n" + 
+			"	bar()[+]: {}\n" + 
+			"	foo()[-]: {}"
+		);
+	} finally {
+		stopDeltas();
+		TestCompilationParticipant.failToInstantiate = false;
+	}
+}
+
+	/*
  * Ensures that errors are fixed if renaming the .classpath file causes the missing type to be visible.
  * (regression test for https://bugs.eclipse.org/bugs/show_bug.cgi?id=207890)
  */
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/internal/core/JavaModelManager.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/JavaModelManager.java,v
retrieving revision 1.411
diff -u -r1.411 JavaModelManager.java
--- model/org/eclipse/jdt/internal/core/JavaModelManager.java	12 Sep 2008 15:42:59 -0000	1.411
+++ model/org/eclipse/jdt/internal/core/JavaModelManager.java	26 Sep 2008 09:40:48 -0000
@@ -268,8 +268,8 @@
 						}
 					});
 				}
-				CompilationParticipant participant = (CompilationParticipant) participants[i];
-				if (participant != null && participant.isActive(project))
+				CompilationParticipant participant;
+				if ((participants[i] instanceof CompilationParticipant) && (participant = (CompilationParticipant) participants[i]).isActive(project))
 					result[index++] = participant;
 			}
 			if (index == 0)