### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/internal/core/JavaProject.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/JavaProject.java,v
retrieving revision 1.395
diff -u -r1.395 JavaProject.java
--- model/org/eclipse/jdt/internal/core/JavaProject.java	26 Feb 2008 10:11:46 -0000	1.395
+++ model/org/eclipse/jdt/internal/core/JavaProject.java	27 Feb 2008 16:40:35 -0000
@@ -279,10 +279,14 @@
 			}
 		}
 		
-		// keep device only if it was specified (this is because File.getCanonicalPath() converts '/lib/classed.zip' to 'd:/lib/classes/zip')
+		// keep device only if it was specified (this is because File.getCanonicalPath() converts '/lib/classes.zip' to 'd:/lib/classes/zip')
 		if (externalPath.getDevice() == null) {
 			result = result.setDevice(null);
 		} 
+		// keep trailing separator only if it was specified (this is because File.getCanonicalPath() converts 'd:/lib/classes/' to 'd:/lib/classes')
+		if (externalPath.hasTrailingSeparator()) {
+			result = result.addTrailingSeparator();
+		} 
 //		if (JavaModelManager.VERBOSE) {
 //			System.out.println("JAVA MODEL - Canonical path is " + result.toString());
 //		}
#P org.eclipse.jdt.core.tests.model
Index: src/org/eclipse/jdt/core/tests/model/ClasspathTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/ClasspathTests.java,v
retrieving revision 1.169
diff -u -r1.169 ClasspathTests.java
--- src/org/eclipse/jdt/core/tests/model/ClasspathTests.java	26 Feb 2008 10:11:58 -0000	1.169
+++ src/org/eclipse/jdt/core/tests/model/ClasspathTests.java	27 Feb 2008 16:40:36 -0000
@@ -696,11 +696,11 @@
 		this.deleteProject("P");
 	}
 }
-/**
- * Test that a classpath entry for an external jar is externalized
+/*
+ * Ensure that a classpath entry for an external jar is externalized
  * properly.
  */
-public void testClasspathExternalize() throws CoreException {
+public void testExternalize1() throws CoreException { // was testClasspathExternalize
 	try {
 		IJavaProject project= this.createJavaProject("P", new String[] {}, new String[] {getExternalJCLPathString()}, "");
 		IClasspathEntry[] classpath= project.getRawClasspath();
@@ -725,6 +725,15 @@
 		this.deleteProject("P");
 	}
 }
+/*
+ * Ensures that a classpath entry for an external library is externalized properly.
+ * (regression test for https://bugs.eclipse.org/bugs/show_bug.cgi?id=220542 )
+ */
+public void testExternalize2() throws CoreException {
+	String externalLibPath = getExternalFolderPath("externalLib") + File.separator;
+	IClasspathEntry entry = JavaCore.newLibraryEntry(new Path(externalLibPath), null, null);
+	assertEquals("Unexpected external path", externalLibPath, entry.getPath().toOSString());
+}
 /**
  * Move a root and ensure the classpath is not updated (i.e. entry not renamed).
  */