Windows: using a base directory of "C:/" and similar did not work as expected.

h2/src/docsrc/html/changelog.html

@@ -25,6 +25,7 @@ Change Log
 </li><li>Metadata: the password of linked tables is now only visible for admin users.
 </li><li>For Windows, database URLs of the form "jdbc:h2:/test" where considered
     relative and did not work unless the system property "h2.implicitRelativePath" was used.
+</li><li>Windows: using a base directory of "C:/" and similar did not work as expected.
 </li><li>Follow JDBC specification on Procedures MetaData, use P0 as
     return type of procedure.
 </li><li>Issue 531: IDENTITY ignored for added column.

h2/src/main/org/h2/engine/ConnectionInfo.java

@@ -183,7 +183,9 @@ public class ConnectionInfo implements Cloneable {
                 throw DbException.get(ErrorCode.IO_EXCEPTION_1, normalizedName + " outside " +
                         absDir);
             }
-            if (normalizedName.charAt(absDir.length()) != '/') {
+            if (absDir.endsWith("/") || absDir.endsWith("\\")) {
+                // no further checks are needed for C:/ and similar
+            } else if (normalizedName.charAt(absDir.length()) != '/') {
                 // database must be within the directory
                 // (with baseDir=/test, the database name must not be
                 // /test2/x and not /test2)