diff --git a/Source/WebCore/html/HTMLObjectElement.cpp b/Source/WebCore/html/HTMLObjectElement.cpp
index 2ae7a028f042..eedecbe534db 100644
--- a/Source/WebCore/html/HTMLObjectElement.cpp
+++ b/Source/WebCore/html/HTMLObjectElement.cpp
@@ -186,17 +186,6 @@ void HTMLObjectElement::parametersForPlugin(Vector<AtomString>& paramNames, Vect
         }
     }
 
-    // When OBJECT is used for an applet via Sun's Java plugin, the CODEBASE attribute in the tag
-    // points to the Java plugin itself (an ActiveX component) while the actual applet CODEBASE is
-    // in a PARAM tag. See <http://java.sun.com/products/plugin/1.2/docs/tags.html>. This means
-    // we have to explicitly suppress the tag's CODEBASE attribute if there is none in a PARAM,
-    // else our Java plugin will misinterpret it. [4004531]
-    String codebase;
-    if (MIMETypeRegistry::isJavaAppletMIMEType(serviceType)) {
-        codebase = "codebase"_s;
-        uniqueParamNames.add(codebase.impl()); // pretend we found it in a PARAM already
-    }
-
     // Turn the attributes of the <object> element into arrays, but don't override <param> values.
     if (hasAttributes()) {
         for (const Attribute& attribute : attributesIterator()) {
@@ -235,16 +224,6 @@ bool HTMLObjectElement::hasFallbackContent() const
     return false;
 }
 
-bool HTMLObjectElement::hasValidClassId()
-{
-    if (MIMETypeRegistry::isJavaAppletMIMEType(serviceType()) && protocolIs(attributeWithoutSynchronization(classidAttr), "java"_s))
-        return true;
-
-    // HTML5 says that fallback content should be rendered if a non-empty
-    // classid is specified for which the UA can't find a suitable plug-in.
-    return attributeWithoutSynchronization(classidAttr).isEmpty();
-}
-
 // FIXME: This should be unified with HTMLEmbedElement::updateWidget and
 // moved down into HTMLPluginImageElement.cpp
 void HTMLObjectElement::updateWidget(CreatePlugins createPlugins)
@@ -289,9 +268,12 @@ void HTMLObjectElement::updateWidget(CreatePlugins createPlugins)
 
     Ref protectedThis = *this; // Plugin loading can make arbitrary DOM mutations.
 
+    // HTML5 says that fallback content should be rendered if a non-empty
+    // classid is specified for which the UA can't find a suitable plug-in.
+    //
     // Dispatching a beforeLoad event could have executed code that changed the document.
     // Make sure the URL is still safe to load.
-    bool success = hasValidClassId() && canLoadURL(url);
+    bool success = attributeWithoutSynchronization(classidAttr).isEmpty() && canLoadURL(url);
     if (success)
         success = requestObject(url, serviceType, paramNames, paramValues);
     if (!success && hasFallbackContent())
diff --git a/Source/WebCore/html/HTMLObjectElement.h b/Source/WebCore/html/HTMLObjectElement.h
index 2de81e0beeec..18da9299fac5 100644
--- a/Source/WebCore/html/HTMLObjectElement.h
+++ b/Source/WebCore/html/HTMLObjectElement.h
@@ -80,8 +80,6 @@ class HTMLObjectElement final : public HTMLPlugInImageElement, public FormListed
     // so that we can better share code between <object> and <embed>.
     void parametersForPlugin(Vector<AtomString>& paramNames, Vector<AtomString>& paramValues, String& url, String& serviceType);
 
-    bool hasValidClassId();
-
     void refFormAssociatedElement() const final { ref(); }
     void derefFormAssociatedElement() const final { deref(); }
 
diff --git a/Source/WebCore/platform/MIMETypeRegistry.cpp b/Source/WebCore/platform/MIMETypeRegistry.cpp
index 330e05696e24..ce0ae8ff991a 100644
--- a/Source/WebCore/platform/MIMETypeRegistry.cpp
+++ b/Source/WebCore/platform/MIMETypeRegistry.cpp
@@ -630,17 +630,6 @@ bool MIMETypeRegistry::isXMLEntityMIMEType(StringView mimeType)
         || equalLettersIgnoringASCIICase(mimeType, "application/xml-external-parsed-entity"_s);
 }
 
-bool MIMETypeRegistry::isJavaAppletMIMEType(const String& mimeType)
-{
-    // Since this set is very limited and is likely to remain so we won't bother with the overhead
-    // of using a hash set.
-    // Any of the MIME types below may be followed by any number of specific versions of the JVM,
-    // which is why we use startsWith()
-    return startsWithLettersIgnoringASCIICase(mimeType, "application/x-java-applet"_s)
-        || startsWithLettersIgnoringASCIICase(mimeType, "application/x-java-bean"_s)
-        || startsWithLettersIgnoringASCIICase(mimeType, "application/x-java-vm"_s);
-}
-
 bool MIMETypeRegistry::isPDFMIMEType(const String& mimeType)
 {
     static constexpr SortedArraySet set { pdfMIMETypeArray };
diff --git a/Source/WebCore/platform/MIMETypeRegistry.h b/Source/WebCore/platform/MIMETypeRegistry.h
index 02565e4f321c..f393e5329406 100644
--- a/Source/WebCore/platform/MIMETypeRegistry.h
+++ b/Source/WebCore/platform/MIMETypeRegistry.h
@@ -98,9 +98,6 @@ class MIMETypeRegistry {
     // Check to see if a MIME type is suitable for being loaded using <track>>.
     WEBCORE_EXPORT static bool isSupportedTextTrackMIMEType(const String& mimeType);
 
-    // Check to see if a MIME type is a valid Java applet mime type.
-    WEBCORE_EXPORT static bool isJavaAppletMIMEType(const String& mimeType);
-
     // Check to see if a MIME type is a plugin implemented by the browser.
     static bool isApplicationPluginMIMEType(const String& mimeType);