### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: compiler/org/eclipse/jdt/internal/compiler/lookup/CompilationUnitScope.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/lookup/CompilationUnitScope.java,v
retrieving revision 1.121
diff -u -r1.121 CompilationUnitScope.java
--- compiler/org/eclipse/jdt/internal/compiler/lookup/CompilationUnitScope.java	24 Oct 2008 18:55:24 -0000	1.121
+++ compiler/org/eclipse/jdt/internal/compiler/lookup/CompilationUnitScope.java	20 Nov 2008 20:24:29 -0000
@@ -84,7 +84,8 @@
 		}
 	} else {
 		if ((this.fPackage = this.environment.createPackage(this.currentPackageName)) == null) {
-			problemReporter().packageCollidesWithType(this.referenceContext);
+			if (this.referenceContext.currentPackage != null)
+				problemReporter().packageCollidesWithType(this.referenceContext); // only report when the unit has a package statement
 			return;
 		} else if (this.referenceContext.isPackageInfo()) {
 			// resolve package annotations now if this is "package-info.java".
#P org.eclipse.jdt.core.tests.builder
Index: src/org/eclipse/jdt/core/tests/builder/PackageTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.builder/src/org/eclipse/jdt/core/tests/builder/PackageTests.java,v
retrieving revision 1.15
diff -u -r1.15 PackageTests.java
--- src/org/eclipse/jdt/core/tests/builder/PackageTests.java	27 Jun 2008 16:02:02 -0000	1.15
+++ src/org/eclipse/jdt/core/tests/builder/PackageTests.java	20 Nov 2008 20:24:29 -0000
@@ -15,10 +15,12 @@
 import junit.framework.*;
 
 import org.eclipse.core.resources.IFolder;
+import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.jdt.core.JavaModelException;
+import org.eclipse.jdt.core.compiler.CategorizedProblem;
 import org.eclipse.jdt.core.tests.util.Util;
 
 public class PackageTests extends BuilderTests {
@@ -83,6 +85,32 @@
 		expectingNoProblems();
 	}
 
+	/**
+	 * https://bugs.eclipse.org/bugs/show_bug.cgi?id=251690
+	 */
+	public void testNoPackageProblem() throws JavaModelException {
+		IPath projectPath = env.addProject("Project"); //$NON-NLS-1$
+		env.addExternalJars(projectPath, Util.getJavaClassLibs());
+		env.removePackageFragmentRoot(projectPath, ""); //$NON-NLS-1$
+		IPath src = env.addPackageFragmentRoot(projectPath, "src"); //$NON-NLS-1$
+		env.setOutputFolder(projectPath, "bin"); //$NON-NLS-1$
+
+		IPath aPath = env.addClass(src, "p", "A", //$NON-NLS-1$ //$NON-NLS-2$
+			"package p;\n"+ //$NON-NLS-1$
+			"public class A {}" //$NON-NLS-1$
+		);
+
+		IPath bPath = env.addClass(src, "p.A", "B", //$NON-NLS-1$ //$NON-NLS-2$
+			"public class B {}" //$NON-NLS-1$
+		);
+
+		fullBuild();
+		expectingOnlySpecificProblemFor(aPath,
+			new Problem("", "The type A collides with a package", aPath, 24, 25, CategorizedProblem.CAT_TYPE, IMarker.SEVERITY_WARNING)); //$NON-NLS-1$ //$NON-NLS-2$
+		expectingOnlySpecificProblemFor(bPath,
+			new Problem("", "The declared package \"\" does not match the expected package \"p.A\"", bPath, 0, 0, CategorizedProblem.CAT_INTERNAL, IMarker.SEVERITY_ERROR)); //$NON-NLS-1$ //$NON-NLS-2$
+	}
+
 // https://bugs.eclipse.org/bugs/show_bug.cgi?id=117092
 // simplistic linked subfolder used as package, external case (not in workspace)
 public void test001() throws CoreException {