diff --git a/src/java.base/share/classes/java/lang/LiveStackFrame.java b/src/java.base/share/classes/java/lang/LiveStackFrame.java
index 77a02d083c8..7b61d191e3b 100644
--- a/src/java.base/share/classes/java/lang/LiveStackFrame.java
+++ b/src/java.base/share/classes/java/lang/LiveStackFrame.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -154,8 +154,6 @@ interface LiveStackFrame extends StackFrame {
     /**
      * Gets {@code StackWalker} that can get locals and operands.
      *
-     * @throws SecurityException if the security manager is present and
-     * denies access to {@code RuntimePermission("liveStackFrames")}
      */
     public static StackWalker getStackWalker() {
         return getStackWalker(EnumSet.noneOf(StackWalker.Option.class));
@@ -171,12 +169,6 @@ interface LiveStackFrame extends StackFrame {
      * The returned {@code StackWalker} can get locals and operands.
      *
      * @param options stack walk {@link StackWalker.Option options}
-     *
-     * @throws SecurityException if the security manager is present and
-     * it denies access to {@code RuntimePermission("liveStackFrames")};
-     * or if the given {@code options} contains
-     * {@link StackWalker.Option#RETAIN_CLASS_REFERENCE Option.RETAIN_CLASS_REFERENCE}
-     * and it denies access to {@code RuntimePermission("getStackWalkerWithClassReference")}.
      */
     public static StackWalker getStackWalker(Set<StackWalker.Option> options) {
         return getStackWalker(options, null);
@@ -193,19 +185,8 @@ interface LiveStackFrame extends StackFrame {
      *
      * @param options stack walk {@link StackWalker.Option options}
      * @param contScope the continuation scope up to which (inclusive) to walk the stack
-     *
-     * @throws SecurityException if the security manager is present and
-     * it denies access to {@code RuntimePermission("liveStackFrames")}; or
-     * or if the given {@code options} contains
-     * {@link StackWalker.Option#RETAIN_CLASS_REFERENCE Option.RETAIN_CLASS_REFERENCE}
-     * and it denies access to {@code RuntimePermission("getStackWalkerWithClassReference")}.
      */
     public static StackWalker getStackWalker(Set<StackWalker.Option> options, ContinuationScope contScope) {
-        @SuppressWarnings("removal")
-        SecurityManager sm = System.getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new RuntimePermission("liveStackFrames"));
-        }
         return StackWalker.newInstance(options, LOCALS_AND_OPERANDS, contScope);
     }
 
@@ -213,9 +194,6 @@ interface LiveStackFrame extends StackFrame {
      * Gets {@code StackWalker} of the given unmounted continuation, that can get locals and operands.
      *
      * @param continuation the continuation to walk
-     *
-     * @throws SecurityException if the security manager is present and
-     * denies access to {@code RuntimePermission("liveStackFrames")}
      */
     public static StackWalker getStackWalker(Continuation continuation) {
         return getStackWalker(EnumSet.noneOf(StackWalker.Option.class), continuation.getScope(), continuation);
@@ -232,21 +210,10 @@ interface LiveStackFrame extends StackFrame {
      *
      * @param options stack walk {@link StackWalker.Option options}
      * @param continuation the continuation to walk
-     *
-     * @throws SecurityException if the security manager is present and
-     * it denies access to {@code RuntimePermission("liveStackFrames")}; or
-     * or if the given {@code options} contains
-     * {@link StackWalker.Option#RETAIN_CLASS_REFERENCE Option.RETAIN_CLASS_REFERENCE}
-     * and it denies access to {@code RuntimePermission("getStackWalkerWithClassReference")}.
      */
     public static StackWalker getStackWalker(Set<StackWalker.Option> options,
                                              ContinuationScope contScope,
                                              Continuation continuation) {
-        @SuppressWarnings("removal")
-        SecurityManager sm = System.getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new RuntimePermission("liveStackFrames"));
-        }
         return StackWalker.newInstance(options, LOCALS_AND_OPERANDS, contScope, continuation);
     }
 }
diff --git a/src/java.base/share/classes/java/lang/Module.java b/src/java.base/share/classes/java/lang/Module.java
index 4f9c09bace4..dcc92d012de 100644
--- a/src/java.base/share/classes/java/lang/Module.java
+++ b/src/java.base/share/classes/java/lang/Module.java
@@ -39,6 +39,8 @@ import java.lang.reflect.AccessFlag;
 import java.lang.reflect.AnnotatedElement;
 import java.net.URI;
 import java.net.URL;
+import java.security.CodeSource;
+import java.security.ProtectionDomain;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -294,9 +296,12 @@ public final class Module implements AnnotatedElement {
             String mod = isNamed() ? "module " + getName() : "an unnamed module";
             if (currentClass != null) {
                 // try to extract location of the current class (e.g. jar or folder)
-                URL url = System.codeSource(currentClass);
-                if (url != null) {
-                    mod += " (" + url + ")";
+                CodeSource cs = currentClass.getProtectionDomain().getCodeSource();
+                if (cs != null) {
+                    URL url = cs.getLocation();
+                    if (url != null) {
+                        mod += " (" + url + ")";
+                    }
                 }
             }
             if (illegalNativeAccess == ModuleBootstrap.IllegalNativeAccess.DENY) {
diff --git a/src/java.base/share/classes/java/lang/Runtime.java b/src/java.base/share/classes/java/lang/Runtime.java
index 2f8f003af7c..764a9d7fa63 100644
--- a/src/java.base/share/classes/java/lang/Runtime.java
+++ b/src/java.base/share/classes/java/lang/Runtime.java
@@ -174,11 +174,6 @@ public class Runtime {
      * @see #halt(int)
      */
     public void exit(int status) {
-        @SuppressWarnings("removal")
-        SecurityManager security = System.getSecurityManager();
-        if (security != null) {
-            security.checkExit(status);
-        }
         Shutdown.exit(status);
     }
 
@@ -232,11 +227,6 @@ public class Runtime {
      * @since 1.3
      */
     public void addShutdownHook(Thread hook) {
-        @SuppressWarnings("removal")
-        SecurityManager sm = System.getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new RuntimePermission("shutdownHooks"));
-        }
         ApplicationShutdownHooks.add(hook);
     }
 
@@ -259,11 +249,6 @@ public class Runtime {
      * @since 1.3
      */
     public boolean removeShutdownHook(Thread hook) {
-        @SuppressWarnings("removal")
-        SecurityManager sm = System.getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new RuntimePermission("shutdownHooks"));
-        }
         return ApplicationShutdownHooks.remove(hook);
     }
 
@@ -293,11 +278,6 @@ public class Runtime {
      * @since 1.3
      */
     public void halt(int status) {
-        @SuppressWarnings("removal")
-        SecurityManager sm = System.getSecurityManager();
-        if (sm != null) {
-            sm.checkExit(status);
-        }
         Shutdown.beforeHalt();
         Shutdown.halt(status);
     }
@@ -779,11 +759,6 @@ public class Runtime {
     }
 
     void load0(Class<?> fromClass, String filename) {
-        @SuppressWarnings("removal")
-        SecurityManager security = System.getSecurityManager();
-        if (security != null) {
-            security.checkLink(filename);
-        }
         File file = new File(filename);
         if (!file.isAbsolute()) {
             throw new UnsatisfiedLinkError(
@@ -840,11 +815,6 @@ public class Runtime {
     }
 
     void loadLibrary0(Class<?> fromClass, String libname) {
-        @SuppressWarnings("removal")
-        SecurityManager security = System.getSecurityManager();
-        if (security != null) {
-            security.checkLink(libname);
-        }
         if (libname.indexOf((int)File.separatorChar) != -1) {
             throw new UnsatisfiedLinkError(
                 "Directory separator should not appear in library name: " + libname);
diff --git a/src/java.base/share/classes/java/lang/StackWalker.java b/src/java.base/share/classes/java/lang/StackWalker.java
index a6756f3278b..0c6e400b2fb 100644
--- a/src/java.base/share/classes/java/lang/StackWalker.java
+++ b/src/java.base/share/classes/java/lang/StackWalker.java
@@ -379,7 +379,6 @@ public final class StackWalker {
         }
 
         EnumSet<Option> optionSet = toEnumSet(options);
-        checkPermission(optionSet);
         return new StackWalker(optionSet);
     }
 
@@ -409,7 +408,6 @@ public final class StackWalker {
             throw new IllegalArgumentException("estimateDepth must be > 0");
         }
         EnumSet<Option> optionSet = toEnumSet(options);
-        checkPermission(optionSet);
         return new StackWalker(optionSet, estimateDepth);
     }
 
@@ -433,17 +431,6 @@ public final class StackWalker {
         this.continuation = continuation;
     }
 
-    private static void checkPermission(Set<Option> options) {
-        Objects.requireNonNull(options);
-        @SuppressWarnings("removal")
-        SecurityManager sm = System.getSecurityManager();
-        if (sm != null) {
-            if (options.contains(Option.RETAIN_CLASS_REFERENCE)) {
-                sm.checkPermission(new RuntimePermission("getStackWalkerWithClassReference"));
-            }
-        }
-    }
-
     /*
      * Returns a defensive copy
      */
@@ -637,7 +624,6 @@ public final class StackWalker {
 
     static StackWalker newInstance(Set<Option> options, ExtendedOption extendedOption, ContinuationScope contScope, Continuation continuation) {
         EnumSet<Option> optionSet = toEnumSet(options);
-        checkPermission(optionSet);
         return new StackWalker(optionSet, 0, extendedOption, contScope, continuation);
     }
 
diff --git a/src/java.base/share/classes/java/lang/String.java b/src/java.base/share/classes/java/lang/String.java
index 3d8481be1c3..e497e8faa6c 100644
--- a/src/java.base/share/classes/java/lang/String.java
+++ b/src/java.base/share/classes/java/lang/String.java
@@ -685,12 +685,6 @@ public final class String
             cd.onMalformedInput(CodingErrorAction.REPLACE)
                     .onUnmappableCharacter(CodingErrorAction.REPLACE);
             char[] ca = new char[en];
-            if (charset.getClass().getClassLoader0() != null &&
-                    System.getSecurityManager() != null) {
-                bytes = Arrays.copyOfRange(bytes, offset, offset + length);
-                offset = 0;
-            }
-
             int caLen;
             try {
                 caLen = decodeWithDecoder(cd, ca, bytes, offset, length);
@@ -828,10 +822,6 @@ public final class String
         }
         int en = scale(len, cd.maxCharsPerByte());
         char[] ca = new char[en];
-        if (cs.getClass().getClassLoader0() != null &&
-                System.getSecurityManager() != null) {
-            src = Arrays.copyOf(src, len);
-        }
         int caLen;
         try {
             caLen = decodeWithDecoder(cd, ca, src, 0, src.length);
@@ -850,9 +840,8 @@ public final class String
     private static final char REPL = '\ufffd';
 
     // Trim the given byte array to the given length
-    @SuppressWarnings("removal")
-    private static byte[] safeTrim(byte[] ba, int len, boolean isTrusted) {
-        if (len == ba.length && (isTrusted || System.getSecurityManager() == null)) {
+    private static byte[] trimArray(byte[] ba, int len) {
+        if (len == ba.length) {
             return ba;
         } else {
             return Arrays.copyOf(ba, len);
@@ -907,7 +896,7 @@ public final class String
             int blen = (coder == LATIN1) ? ae.encodeFromLatin1(val, 0, len, ba)
                     : ae.encodeFromUTF16(val, 0, len, ba);
             if (blen != -1) {
-                return safeTrim(ba, blen, true);
+                return trimArray(ba, blen);
             }
         }
 
@@ -937,7 +926,7 @@ public final class String
                 throw new Error(x);
             }
         }
-        return safeTrim(ba, bb.position(), cs.getClass().getClassLoader0() == null);
+        return trimArray(ba, bb.position());
     }
 
     /*
diff --git a/src/java.base/share/classes/java/lang/System.java b/src/java.base/share/classes/java/lang/System.java
index b5cea4236ad..e5e8d4df27a 100644
--- a/src/java.base/share/classes/java/lang/System.java
+++ b/src/java.base/share/classes/java/lang/System.java
@@ -42,25 +42,18 @@ import java.lang.module.ModuleDescriptor;
 import java.lang.reflect.Executable;
 import java.lang.reflect.Method;
 import java.net.URI;
-import java.net.URL;
 import java.nio.channels.Channel;
 import java.nio.channels.spi.SelectorProvider;
 import java.nio.charset.CharacterCodingException;
 import java.nio.charset.Charset;
-import java.security.AccessController;
-import java.security.CodeSource;
-import java.security.PrivilegedAction;
 import java.security.ProtectionDomain;
-import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Properties;
-import java.util.PropertyPermission;
 import java.util.ResourceBundle;
 import java.util.Set;
-import java.util.WeakHashMap;
 import java.util.concurrent.Executor;
 import java.util.function.Supplier;
 import java.util.concurrent.ConcurrentHashMap;
@@ -92,7 +85,6 @@ import jdk.internal.vm.annotation.Stable;
 import sun.reflect.annotation.AnnotationType;
 import sun.nio.ch.Interruptible;
 import sun.nio.cs.UTF_8;
-import sun.security.util.SecurityConstants;
 
 /**
  * The {@code System} class contains several useful class fields
@@ -200,7 +192,6 @@ public final class System {
      * @since   1.1
      */
     public static void setIn(InputStream in) {
-        checkIO();
         setIn0(in);
     }
 
@@ -212,7 +203,6 @@ public final class System {
      * @since   1.1
      */
     public static void setOut(PrintStream out) {
-        checkIO();
         setOut0(out);
     }
 
@@ -224,7 +214,6 @@ public final class System {
      * @since   1.1
      */
     public static void setErr(PrintStream err) {
-        checkIO();
         setErr0(err);
     }
 
@@ -275,32 +264,10 @@ public final class System {
         return SelectorProvider.provider().inheritedChannel();
     }
 
-    private static void checkIO() {
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new RuntimePermission("setIO"));
-        }
-    }
-
     private static native void setIn0(InputStream in);
     private static native void setOut0(PrintStream out);
     private static native void setErr0(PrintStream err);
 
-    private static class CallersHolder {
-        // Remember callers of setSecurityManager() here so that warning
-        // is only printed once for each different caller
-        static final Map<Class<?>, Boolean> callers
-            = Collections.synchronizedMap(new WeakHashMap<>());
-    }
-
-    static URL codeSource(Class<?> clazz) {
-        PrivilegedAction<ProtectionDomain> pa = clazz::getProtectionDomain;
-        @SuppressWarnings("removal")
-        CodeSource cs = AccessController.doPrivileged(pa).getCodeSource();
-        return (cs != null) ? cs.getLocation() : null;
-    }
-
     /**
      * Throws {@code UnsupportedOperationException}. Setting a security manager
      * is not supported.
@@ -681,12 +648,6 @@ public final class System {
      * @see        java.util.Properties
      */
     public static Properties getProperties() {
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPropertiesAccess();
-        }
-
         return props;
     }
 
@@ -725,12 +686,6 @@ public final class System {
      * @see        java.util.Properties
      */
     public static void setProperties(Properties props) {
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPropertiesAccess();
-        }
-
         if (props == null) {
             Map<String, String> tempProps = SystemProps.initProperties();
             VersionProps.init(tempProps);
@@ -762,12 +717,6 @@ public final class System {
      */
     public static String getProperty(String key) {
         checkKey(key);
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPropertyAccess(key);
-        }
-
         return props.getProperty(key);
     }
 
@@ -790,12 +739,6 @@ public final class System {
      */
     public static String getProperty(String key, String def) {
         checkKey(key);
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPropertyAccess(key);
-        }
-
         return props.getProperty(key, def);
     }
 
@@ -822,13 +765,6 @@ public final class System {
      */
     public static String setProperty(String key, String value) {
         checkKey(key);
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new PropertyPermission(key,
-                SecurityConstants.PROPERTY_WRITE_ACTION));
-        }
-
         return (String) props.setProperty(key, value);
     }
 
@@ -853,12 +789,6 @@ public final class System {
      */
     public static String clearProperty(String key) {
         checkKey(key);
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new PropertyPermission(key, "write"));
-        }
-
         return (String) props.remove(key);
     }
 
@@ -905,12 +835,6 @@ public final class System {
      * @see    ProcessBuilder#environment()
      */
     public static String getenv(String name) {
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new RuntimePermission("getenv."+name));
-        }
-
         return ProcessEnvironment.getenv(name);
     }
 
@@ -945,12 +869,6 @@ public final class System {
      * @since  1.5
      */
     public static java.util.Map<String,String> getenv() {
-        @SuppressWarnings("removal")
-        SecurityManager sm = getSecurityManager();
-        if (sm != null) {
-            sm.checkPermission(new RuntimePermission("getenv.*"));
-        }
-
         return ProcessEnvironment.getenv();
     }
 
@@ -1376,13 +1294,6 @@ public final class System {
      */
     @SuppressWarnings("doclint:reference") // cross-module links
     public abstract static class LoggerFinder {
-        /**
-         * The {@code RuntimePermission("loggerFinder")} is
-         * necessary to subclass and instantiate the {@code LoggerFinder} class,
-         * as well as to obtain loggers from an instance of that class.
-         */
-        static final RuntimePermission LOGGERFINDER_PERMISSION =
-                new RuntimePermission("loggerFinder");
 
         /**
          * Creates a new instance of {@code LoggerFinder}.
@@ -1393,20 +1304,6 @@ public final class System {
          *   loading cycles during the instantiation of the service provider.
          */
         protected LoggerFinder() {
-            this(checkPermission());
-        }
-
-        private LoggerFinder(Void unused) {
-            // nothing to do.
-        }
-
-        private static Void checkPermission() {
-            @SuppressWarnings("removal")
-            final SecurityManager sm = System.getSecurityManager();
-            if (sm != null) {
-                sm.checkPermission(LOGGERFINDER_PERMISSION);
-            }
-            return null;
         }
 
         /**
@@ -1476,11 +1373,6 @@ public final class System {
          * @return the {@link LoggerFinder LoggerFinder} instance.
          */
         public static LoggerFinder getLoggerFinder() {
-            @SuppressWarnings("removal")
-            final SecurityManager sm = System.getSecurityManager();
-            if (sm != null) {
-                sm.checkPermission(LOGGERFINDER_PERMISSION);
-            }
             return accessProvider();
         }
 
@@ -1493,10 +1385,7 @@ public final class System {
             // just fetch it again.
             LoggerFinder finder = service;
             if (finder == null) {
-                PrivilegedAction<LoggerFinder> pa =
-                        () -> LoggerFinderLoader.getLoggerFinder();
-                finder = AccessController.doPrivileged(pa, null,
-                        LOGGERFINDER_PERMISSION);
+                finder = LoggerFinderLoader.getLoggerFinder();
                 if (finder instanceof TemporaryLoggerFinder) return finder;
                 service = finder;
             }
@@ -1602,17 +1491,6 @@ public final class System {
         if (caller == null) {
             throw new IllegalCallerException("no caller frame");
         }
-        final SecurityManager sm = System.getSecurityManager();
-        // We don't use LazyLoggers if a resource bundle is specified.
-        // Bootstrap sensitive classes in the JDK do not use resource bundles
-        // when logging. This could be revisited later, if it needs to.
-        if (sm != null) {
-            final PrivilegedAction<Logger> pa =
-                    () -> LoggerFinder.accessProvider()
-                            .getLocalizedLogger(name, rb, caller.getModule());
-            return AccessController.doPrivileged(pa, null,
-                                         LoggerFinder.LOGGERFINDER_PERMISSION);
-        }
         return LoggerFinder.accessProvider()
                 .getLocalizedLogger(name, rb, caller.getModule());
     }