diff --git a/src/hotspot/share/classfile/classLoaderExt.cpp b/src/hotspot/share/classfile/classLoaderExt.cpp
index 78e29f990d7..3cd7dd7cd3b 100644
--- a/src/hotspot/share/classfile/classLoaderExt.cpp
+++ b/src/hotspot/share/classfile/classLoaderExt.cpp
@@ -213,6 +213,15 @@ void ClassLoaderExt::process_jar_manifest(JavaThread* current, ClassPathEntry* e
     char sep = os::file_separator()[0];
     const char* dir_name = entry->name();
     const char* dir_tail = strrchr(dir_name, sep);
+#ifdef _WINDOWS
+    // On Windows, we also support forward slash as the file separator when locating entries in the classpath entry.
+    const char* dir_tail2 = strrchr(dir_name, '/');
+    if (dir_tail == nullptr) {
+      dir_tail = dir_tail2;
+    } else if (dir_tail2 != nullptr && dir_tail2 > dir_tail) {
+      dir_tail = dir_tail2;
+    }
+#endif
     int dir_len;
     if (dir_tail == nullptr) {
       dir_len = 0;
diff --git a/test/hotspot/jtreg/runtime/cds/appcds/ClassPathAttr.java b/test/hotspot/jtreg/runtime/cds/appcds/ClassPathAttr.java
index f0d797c09ae..560f42d0467 100644
--- a/test/hotspot/jtreg/runtime/cds/appcds/ClassPathAttr.java
+++ b/test/hotspot/jtreg/runtime/cds/appcds/ClassPathAttr.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,6 +30,7 @@
  * @run driver/timeout=240 ClassPathAttr
  */
 
+import jdk.test.lib.Platform;
 import jdk.test.lib.cds.CDSTestUtils;
 import jdk.test.lib.process.OutputAnalyzer;
 import java.io.File;
@@ -82,6 +83,76 @@ public class ClassPathAttr {
             output.shouldMatch("checking shared classpath entry: .*cpattr2.jar");
             output.shouldMatch("checking shared classpath entry: .*cpattr3.jar");
           });
+
+      // Test handling of forward slash ('/') file separator when locating entries
+      // in the classpath entry on Windows.
+      // Skip the following test when CDS dynamic dump is enabled due to some
+      // issue when converting a relative path to real path.
+      if (Platform.isWindows() && !CDSTestUtils.DYNAMIC_DUMP) {
+          // Test with relative path
+          // Find the index to the dir before the jar file.
+          int idx = jar1.lastIndexOf(File.separator);
+          idx = jar1.substring(0, idx - 1).lastIndexOf(File.separator);
+          // Setup jar directory and names.
+          String jarDir = jar1.substring(0, idx);
+          String jar1Name = jar1.substring(idx + 1);
+          String jar4Name = jar4.substring(idx + 1);
+          String newCp = jar1Name.replace("\\", "/") + File.pathSeparator + jar4Name.replace("\\", "/");
+
+          OutputAnalyzer out = TestCommon.testDump(jarDir, newCp, classlist, "-Xlog:class+path=info");
+          if (i == 1) {
+              out.shouldMatch("opened:.*cpattr1.jar"); // first jar on -cp
+          } else {
+              // first jar on -cp with long Class-Path: attribute
+              out.shouldMatch("opened:.*cpattr1_long.jar");
+          }
+          // one of the jar in the Class-Path: attribute of cpattr1.jar
+          out.shouldMatch("opened:.*cpattr2.jar");
+
+          TestCommon.runWithRelativePath(
+              jarDir.replace("\\", "/"),
+              "-Xlog:class+path,class+load",
+              "-cp", newCp,
+              "CpAttr1")
+            .assertNormalExit(output -> {
+                output.shouldMatch("checking shared classpath entry: .*cpattr2.jar");
+                output.shouldMatch("checking shared classpath entry: .*cpattr3.jar");
+              });
+
+          // Go one directory up.
+          int idx2 = jar1.substring(0, idx - 1).lastIndexOf(File.separator);
+          if (idx2 != -1) {
+              // Setup jar directory and names.
+              jarDir = jar1.substring(0, idx2);
+              // Set relative path to jar containing '\' and '/' file separators
+              // e.g. d1\d2/A.jar
+              jar1Name = jar1.substring(idx2 + 1).replace("\\", "/");
+              jar4Name = jar4.substring(idx2 + 1).replace("\\", "/");
+              jar1Name = jar1Name.replaceFirst("/", "\\\\");
+              jar4Name = jar4Name.replaceFirst("/", "\\\\");
+
+              newCp = jar1Name + File.pathSeparator + jar4Name;
+              out = TestCommon.testDump(jarDir, newCp, classlist, "-Xlog:class+path=info");
+              if (i == 1) {
+                  out.shouldMatch("opened:.*cpattr1.jar"); // first jar on -cp
+              } else {
+                  // first jar on -cp with long Class-Path: attribute
+                  out.shouldMatch("opened:.*cpattr1_long.jar");
+              }
+              // one of the jar in the Class-Path: attribute of cpattr1.jar
+              out.shouldMatch("opened:.*cpattr2.jar");
+
+              TestCommon.runWithRelativePath(
+                  jarDir.replace("\\", "/"),
+                  "-Xlog:class+path,class+load",
+                  "-cp", newCp,
+                  "CpAttr1")
+                .assertNormalExit(output -> {
+                    output.shouldMatch("checking shared classpath entry: .*cpattr2.jar");
+                    output.shouldMatch("checking shared classpath entry: .*cpattr3.jar");
+                  });
+          }
+      }
     }
 
     // test duplicate jars in the "Class-path" attribute in the jar manifest