.gitignore

@@ -12,4 +12,4 @@ tmp/
 .project
 .settings
 TestLog.xml
-
+*~

README.md

 Java bytecode engineering toolkit
 ### [Javassist version 3](http://www.javassist.org)
 
-Copyright (C) 1999-2018 by Shigeru Chiba, All rights reserved.
+Copyright (C) 1999-2019 by Shigeru Chiba, All rights reserved.
 
 Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation
 simple. It is a class library for editing bytecodes in Java; it enables Java

Readme.html

@@ -7,7 +7,7 @@
 
 <h1>Javassist version 3</h1>
 
-<h3>Copyright (C) 1999-2018 by Shigeru Chiba, All rights reserved.</h3>
+<h3>Copyright (C) 1999-2019 by Shigeru Chiba, All rights reserved.</h3>
 
 <p><br></p>
 
@@ -281,9 +281,29 @@ see javassist.Dump.
 
 <h2>Changes</h2>
 
+<p>-version 3.25 on April 16, 2019
+<ul>
+    <li>GitHub Issue #72 (PR #231), #241, #242 (PR #243), PR #244,
+        #246 (PR #247), PR #250, #252 (PR #253), PR #254.
+</ul>
+
+<p>-version 3.24.1 on December 9, 2018
+<ul>
+    <li>GitHub Issue #228, #229</li>
+<ul>
+</p>
+
+<p>-version 3.24 on November 1, 2018
+<ul>
+    <li>Java 11 supports.</li>
+    <li>JIRA JASSIST-267.</li>
+    <li>Github PR #218.</li>
+</ul>
+</p>
+
 <p>-version 3.23.1 on July 2, 2018
 <ul>
-    <li>Github pull issue #171.</li>
+    <li>Github PR #171.</li>
 </ul>
 </p>
 

build.xml

@@ -6,7 +6,7 @@
 
 <project name="javassist" default="jar" basedir=".">
 
-  <property name="dist-version" value="javassist-3.23.1-GA"/>
+  <property name="dist-version" value="javassist-3.25.0-GA"/>
 
   <property environment="env"/>
   <property name="target.jar" value="javassist.jar"/>
@@ -74,13 +74,13 @@
     </javac>
   </target>
 
-  <target name="compile16" depends="prepare">
+  <target name="compile18" depends="prepare">
     <javac srcdir="${src.dir}"
            destdir="${build.classes.dir}"
            debug="on"
            deprecation="on"
-	       source="1.6"
-	       target="1.6"
+	       source="1.7"
+	       target="1.7"
            optimize="off"
     	   includeantruntime="true"
            includes="**">
@@ -181,7 +181,7 @@
 to ${build.classes.dir}.</echo>
   </target>
 
-  <target name="jar" depends="compile16">
+  <target name="jar" depends="compile18">
     <jar jarfile="${target.jar}" update="true" manifest="${src.dir}/META-INF/MANIFEST.MF">
       <fileset dir="${build.classes.dir}">
       	  <include name="**/*.class"/>

pom.xml

@@ -7,7 +7,7 @@
   	Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation
     simple.  It is a class library for editing bytecodes in Java.
   </description>
-  <version>3.23.1-GA</version>
+  <version>3.25.0-GA</version>
   <name>Javassist</name>
   <url>http://www.javassist.org/</url>
 
@@ -151,10 +151,10 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.2</version>
         <configuration>
-          <source>1.6</source>
-          <target>1.6</target>
-          <testSource>1.9</testSource>
-          <testTarget>1.9</testTarget>
+          <source>1.7</source>
+          <target>1.7</target>
+          <testSource>11</testSource>
+          <testTarget>11</testTarget>
           <testCompilerArgument>-parameters</testCompilerArgument>
         </configuration>
       </plugin>
@@ -202,9 +202,15 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>3.0.0-M1</version>
+        <version>3.0.1</version>
 	<configuration>
 	  <attach>true</attach>
+          <excludePackageNames>javassist.compiler:javassist.convert:javassist.scopedpool:javassist.bytecode.stackmap</excludePackageNames>
+          <bottom><![CDATA[<i>Javassist, a Java-bytecode translator toolkit.<br>
+Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.</i>]]></bottom>
+          <show>public</show>
+          <nohelp>true</nohelp>
+          <doclint>none</doclint>
 	</configuration>
       </plugin>
       <plugin>

src/main/META-INF/MANIFEST.MF

 Specification-Title: Javassist
 Specification-Vendor: Shigeru Chiba, www.javassist.org
-Specification-Version: 3.23.1-GA
+Specification-Version: 3.25.0-GA
 Main-Class: javassist.CtClass
+Automatic-Module-Name: org.javassist

src/main/javassist/ByteArrayClassPath.java

@@ -17,9 +17,12 @@
 package javassist;
 
 import java.io.ByteArrayInputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLStreamHandler;
 
 /**
  * A <code>ByteArrayClassPath</code> contains bytes that is served as
@@ -86,12 +89,34 @@ public class ByteArrayClassPath implements ClassPath {
         if(this.classname.equals(classname)) {
             String cname = classname.replace('.', '/') + ".class";
             try {
-                // return new File(cname).toURL();
-                return new URL("file:/ByteArrayClassPath/" + cname);
+                return new URL(null, "file:/ByteArrayClassPath/" + cname, new BytecodeURLStreamHandler());
             }
             catch (MalformedURLException e) {}
         }
 
         return null;
     }
+
+    private class BytecodeURLStreamHandler extends URLStreamHandler {
+        protected URLConnection openConnection(final URL u) {
+            return new BytecodeURLConnection(u);
+        }
+    }
+
+    private class BytecodeURLConnection extends URLConnection {
+        protected BytecodeURLConnection(URL url) {
+            super(url);
+        }
+
+        public void connect() throws IOException {
+        }
+
+        public InputStream getInputStream() throws IOException {
+            return new ByteArrayInputStream(classfile);
+        }
+
+        public int getContentLength() {
+            return classfile.length;
+        }
+    }
 }

src/main/javassist/ClassPool.java

@@ -1023,16 +1023,23 @@ public class ClassPool {
      * the <code>getClassLoader()</code> method.
      * If the program is running on some application
      * server, the context class loader might be inappropriate to load the
-     * class.
+     * class.</p>
      *
      * <p>This method is provided for convenience.  If you need more
      * complex functionality, you should write your own class loader.
      *
-     * <p><b>Warining:</b> A Class object returned by this method may not
+     * <p><b>Warining:</b>
+     * This method should not be used in Java 11 or later.
+     * Use {@link #toClass(CtClass,Class)}.
+     * </p>
+     *
+     * <p><b>Warining:</b>
+     * A Class object returned by this method may not
      * work with a security manager or a signed jar file because a
-     * protection domain is not specified.
+     * protection domain is not specified.</p>
      *
-     * @see #toClass(CtClass, java.lang.ClassLoader, ProtectionDomain)
+     * @see #toClass(CtClass,Class)
+     * @see #toClass(CtClass,Class,java.lang.ClassLoader,ProtectionDomain)
      * @see #getClassLoader()
      */
     public Class toClass(CtClass clazz) throws CannotCompileException {
@@ -1066,21 +1073,21 @@ public class ClassPool {
     /**
      * Converts the class to a <code>java.lang.Class</code> object.
      * Do not override this method any more at a subclass because
-     * <code>toClass(CtClass)</code> never calls this method.
+     * {@link #toClass(CtClass)} will never calls this method.
      *
      * <p><b>Warining:</b> A Class object returned by this method may not
      * work with a security manager or a signed jar file because a
      * protection domain is not specified.
      *
-     * @deprecated      Replaced by {@link #toClass(CtClass,ClassLoader,ProtectionDomain)}.
+     * @deprecated      Replaced by {@link #toClass(CtClass,Class,ClassLoader,ProtectionDomain)}.
      * A subclass of <code>ClassPool</code> that has been
      * overriding this method should be modified.  It should override
-     * {@link #toClass(CtClass,ClassLoader,ProtectionDomain)}.
+     * {@link #toClass(CtClass,Class,ClassLoader,ProtectionDomain)}.
      */
     public Class toClass(CtClass ct, ClassLoader loader)
         throws CannotCompileException
     {
-        return toClass(ct, loader, null);
+        return toClass(ct, null, loader, null);
     }
 
     /**
@@ -1092,7 +1099,7 @@ public class ClassPool {
      * loaded by the given class loader to construct a
      * <code>java.lang.Class</code> object.  Since a private method
      * on the class loader is invoked through the reflection API,
-     * the caller must have permissions to do that.
+     * the caller must have permissions to do that.</p>
      *
      * <p>An easy way to obtain <code>ProtectionDomain</code> object is
      * to call <code>getProtectionDomain()</code>
@@ -1100,8 +1107,9 @@ public class ClassPool {
      * class belongs to.
      *
      * <p>This method is provided for convenience.  If you need more
-     * complex functionality, you should write your own class loader.
+     * complex functionality, you should write your own class loader.</p>
      *
+     * @param ct            the class converted into {@code java.lang.Class}.
      * @param loader        the class loader used to load this class.
      *                      For example, the loader returned by
      *                      <code>getClassLoader()</code> can be used
@@ -1112,13 +1120,117 @@ public class ClassPool {
      *
      * @see #getClassLoader()
      * @since 3.3
+     * @deprecated      Replaced by {@link #toClass(CtClass,Class,ClassLoader,ProtectionDomain)}.
      */
     public Class toClass(CtClass ct, ClassLoader loader, ProtectionDomain domain)
         throws CannotCompileException
+    {
+        return toClass(ct, null, loader, domain);
+    }
+
+    /**
+     * Converts the class to a <code>java.lang.Class</code> object.
+     * Once this method is called, further modifications are not allowed
+     * any more.
+     *
+     * <p>This method is available in Java 9 or later.
+     * It loads the class
+     * by using {@code java.lang.invoke.MethodHandles} with {@code neighbor}.
+     * </p>
+     *
+     * @param ct            the class converted into {@code java.lang.Class}.
+     * @param neighbor      a class belonging to the same package that
+     *                      the converted class belongs to.
+     * @since 3.24
+     */
+    public Class<?> toClass(CtClass ct, Class<?> neighbor)
+        throws CannotCompileException
+    {
+        try {
+            return javassist.util.proxy.DefineClassHelper.toClass(neighbor,
+                                                            ct.toBytecode());
+        }
+        catch (IOException e) {
+            throw new CannotCompileException(e);
+        }
+    }
+
+    /**
+     * Converts the class to a <code>java.lang.Class</code> object.
+     * Once this method is called, further modifications are not allowed
+     * any more.
+     *
+     * <p>This method is available in Java 9 or later.
+     * It loads the class
+     * by using the given {@code java.lang.invoke.MethodHandles.Lookup}.
+     * </p>
+     *
+     * @param ct            the class converted into {@code java.lang.Class}.
+     * @since 3.24
+     */
+    public Class<?> toClass(CtClass ct,
+                            java.lang.invoke.MethodHandles.Lookup lookup)
+        throws CannotCompileException
+    {
+        try {
+            return javassist.util.proxy.DefineClassHelper.toClass(lookup,
+                                                            ct.toBytecode());
+        }
+        catch (IOException e) {
+            throw new CannotCompileException(e);
+        }
+    }
+
+    /**
+     * Converts the class to a <code>java.lang.Class</code> object.
+     * Once this method is called, further modifications are not allowed
+     * any more.
+     *
+     * <p>When the JVM is Java 11 or later, this method loads the class
+     * by using {@code java.lang.invoke.MethodHandles} with {@code neighbor}.
+     * The other arguments {@code loader} and {@code domain} are not used;
+     * so they can be null.
+     * </p>
+     *
+     * <p>Otherwise, or when {@code neighbor} is null,
+     * the class file represented by the given <code>CtClass</code> is
+     * loaded by the given class loader to construct a
+     * <code>java.lang.Class</code> object.  Since a private method
+     * on the class loader is invoked through the reflection API,
+     * the caller must have permissions to do that.
+     *
+     * <p>An easy way to obtain <code>ProtectionDomain</code> object is
+     * to call <code>getProtectionDomain()</code>
+     * in <code>java.lang.Class</code>.  It returns the domain that the
+     * class belongs to.
+     *
+     * <p>If your program is for only Java 9 or later, don't use this method.
+     * Use {@link #toClass(CtClass,Class)} or
+     * {@link #toClass(CtClass,java.lang.invoke.MethodHandles.Lookup)}.
+     * </p>
+     *
+     * @param ct            the class converted into {@code java.lang.Class}.
+     * @param neighbor      a class belonging to the same package that
+     *                      the converted class belongs to.
+     *                      It can be null.
+     * @param loader        the class loader used to load this class.
+     *                      For example, the loader returned by
+     *                      <code>getClassLoader()</code> can be used
+     *                      for this parameter.
+     * @param domain        the protection domain for the class.
+     *                      If it is null, the default domain created
+     *                      by <code>java.lang.ClassLoader</code> is used.
+     *
+     * @see #getClassLoader()
+     * @since 3.24
+     */
+    public Class toClass(CtClass ct, Class<?> neighbor, ClassLoader loader,
+                         ProtectionDomain domain)
+            throws CannotCompileException
     {
         try {
             return javassist.util.proxy.DefineClassHelper.toClass(ct.getName(),
-                    loader, domain, ct.toBytecode());
+                    neighbor, loader, domain, ct.toBytecode());
         }
         catch (IOException e) {
             throw new CannotCompileException(e);
@@ -1134,11 +1246,7 @@ public class ClassPool {
      * <code>getPackage()</code> on the <code>Class</code> object returned 
      * by <code>toClass()</code> will return a non-null object.</p>
      *
-     * <p>The jigsaw module introduced by Java 9 has broken this method.
-     * In Java 9 or later, the VM argument
-     * <code>--add-opens java.base/java.lang=ALL-UNNAMED</code>
-     * has to be given to the JVM so that this method can run.
-     * </p>
+     * <p>The jigsaw module introduced by Java 9 has broken this method.</p>
      *
      * @param loader        the class loader passed to <code>toClass()</code> or
      *                      the default one obtained by <code>getClassLoader()</code>.

src/main/javassist/ClassPoolTail.java

@@ -159,7 +159,9 @@ final class JarClassPath implements ClassPath {
         URL jarURL = find(classname);
         if (null != jarURL)
             try {
-                return jarURL.openConnection().getInputStream();
+                java.net.URLConnection con = jarURL.openConnection();
+                con.setUseCaches(false);
+                return con.getInputStream();
             }
             catch (IOException e) {
                 throw new NotFoundException("broken jar file?: "

src/main/javassist/CodeConverter.java

@@ -25,6 +25,7 @@ import javassist.convert.TransformAccessArrayField;
 import javassist.convert.TransformAfter;
 import javassist.convert.TransformBefore;
 import javassist.convert.TransformCall;
+import javassist.convert.TransformCallToStatic;
 import javassist.convert.TransformFieldAccess;
 import javassist.convert.TransformNew;
 import javassist.convert.TransformNewClass;
@@ -406,6 +407,42 @@ public class CodeConverter {
             = new TransformCall(transformers, oldMethodName, newMethod);
     }
 
+    /**
+     * Redirect non-static method invocations in a method body to a static
+     * method. The return type must be same with the originally invoked method.
+     * As parameters, the static method receives
+     * the target object and all the parameters to the originally invoked
+     * method.  For example, if the originally invoked method is
+     * <code>move()</code>:
+     *
+     * <pre>class Point {
+     *     Point move(int x, int y) { ... }
+     * }</pre>
+     *
+     * <p>Then the static method must be something like this:
+     *
+     * <pre>class Verbose {
+     *     static Point print(Point target, int x, int y) { ... }
+     * }</pre>
+     *
+     * <p>The <code>CodeConverter</code> would translate bytecode
+     * equivalent to:
+     *
+     * <pre>Point p2 = p.move(x + y, 0);</pre>
+     *
+     * <p>into the bytecode equivalent to:
+     *
+     * <pre>Point p2 = Verbose.print(p, x + y, 0);</pre>
+     *
+     * @param origMethod   original method
+     * @param staticMethod static method
+     */
+    public void redirectMethodCallToStatic(CtMethod origMethod,
+                                           CtMethod staticMethod) {
+        transformers = new TransformCallToStatic(transformers, origMethod,
+                staticMethod);
+    }
+
     /**
      * Insert a call to another method before an existing method call.
      * That "before" method must be static.  The return type must be

src/main/javassist/CtBehavior.java

@@ -782,7 +782,7 @@ public abstract class CtBehavior extends CtMember {
                                         Modifier.isStatic(getModifiers()));
             jv.recordParamNames(ca, nvars);
             jv.recordLocalVariables(ca, 0);
-            jv.recordType(getReturnType0());
+            jv.recordReturnType(getReturnType0(), false);
             jv.compileStmnt(src);
             Bytecode b = jv.getBytecode();
             int stack = b.getMaxStack();

src/main/javassist/CtClass.java

@@ -69,7 +69,7 @@ public abstract class CtClass {
     /**
      * The version number of this release.
      */
-    public static final String version = "3.23.1-GA";
+    public static final String version = "3.25.0-GA";
 
     /**
      * Prints the version number and the copyright notice.
@@ -80,7 +80,7 @@ public abstract class CtClass {
      */
     public static void main(String[] args) {
         System.out.println("Javassist version " + CtClass.version);
-        System.out.println("Copyright (C) 1999-2018 Shigeru Chiba."
+        System.out.println("Copyright (C) 1999-2019 Shigeru Chiba."
                            + " All Rights Reserved.");
     }
 
@@ -1261,21 +1261,86 @@ public abstract class CtClass {
      * server, the context class loader might be inappropriate to load the
      * class.
      *
+     * <p><b>Warning:</b> In Java 11 or later, the call to this method will
+     * print a warning message:</p>
+     * <blockquote><pre>
+     * WARNING: An illegal reflective access operation has occurred
+     * WARNING: Illegal reflective access by javassist.util.proxy.SecurityActions$3 ...
+     * WARNING: Please consider reporting this to the maintainers of javassist.util.proxy.SecurityActions$3
+     * WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
+     * WARNING: All illegal access operations will be denied in a future release
+     * </pre></blockquote>
+     * <p>To avoid this message, use {@link #toClass(Class)}
+     * or {@link #toClass(java.lang.invoke.MethodHandles.Lookup)}.
+     * {@link #toClass()} will be unavailable in a future release.
+     * </p>
+     *
+     * <p><b>Warning:</b> A Class object returned by this method may not
+     * work with a security manager or a signed jar file because a
+     * protection domain is not specified.</p>
+     *
+     * <p>Note: this method calls <code>toClass()</code>
+     * in <code>ClassPool</code>.</p>
+     *
+     * @see #toClass(java.lang.invoke.MethodHandles.Lookup)
+     * @see #toClass(Class)
+     * @see ClassPool#toClass(CtClass)
+     */
+    public Class<?> toClass() throws CannotCompileException {
+        return getClassPool().toClass(this);
+    }
+
+    /**
+     * Converts this class to a <code>java.lang.Class</code> object.
+     * Once this method is called, further modifications are not
+     * allowed any more.
+     *
+     * <p>This method is provided for convenience.  You should use
+     * {@code toClass(Lookup)} for better compatibility with the
+     * module system.
+     *
+     * <p>Note: this method calls <code>toClass()</code>
+     * in <code>ClassPool</code>.
+     *
+     * <p><b>Warning:</b> A Class object returned by this method may not
+     * work with a security manager or a signed jar file because a
+     * protection domain is not specified.
+     *
+     * @param neighbor    A class belonging to the same package that this
+     *                    class belongs to.  It is used to load the class.
+     * @see ClassPool#toClass(CtClass,Class)
+     * @see #toClass(java.lang.invoke.MethodHandles.Lookup)
+     * @since 3.24
+     */
+    public Class<?> toClass(Class<?> neighbor) throws CannotCompileException
+    {
+        return getClassPool().toClass(this, neighbor);
+    }
+
+    /**
+     * Converts this class to a <code>java.lang.Class</code> object.
+     * Once this method is called, further modifications are not
+     * allowed any more.
+     *
      * <p>This method is provided for convenience.  If you need more
      * complex functionality, you should write your own class loader.
      *
      * <p>Note: this method calls <code>toClass()</code>
      * in <code>ClassPool</code>.
      *
-     * <p><b>Warining:</b> A Class object returned by this method may not
+     * <p><b>Warning:</b> A Class object returned by this method may not
      * work with a security manager or a signed jar file because a
      * protection domain is not specified.
      *
-     * @see #toClass(java.lang.ClassLoader,ProtectionDomain)
-     * @see ClassPool#toClass(CtClass)
+     * @param lookup    used when loading the class.  It has to have
+     *                  an access right to define a new class.
+     * @see ClassPool#toClass(CtClass,java.lang.invoke.MethodHandles.Lookup)
+     * @since 3.24
      */
-    public Class<?> toClass() throws CannotCompileException {
-        return getClassPool().toClass(this);
+    public Class<?> toClass(java.lang.invoke.MethodHandles.Lookup lookup)
+        throws CannotCompileException
+    {
+        return getClassPool().toClass(this, lookup);
     }
 
     /**
@@ -1316,13 +1381,13 @@ public abstract class CtClass {
         if (loader == null)
             loader = cp.getClassLoader();
 
-        return cp.toClass(this, loader, domain);
+        return cp.toClass(this, null, loader, domain);
     }
 
     /**
      * Converts this class to a <code>java.lang.Class</code> object.
      *
-     * <p><b>Warining:</b> A Class object returned by this method may not
+     * <p><b>Warning:</b> A Class object returned by this method may not
      * work with a security manager or a signed jar file because a
      * protection domain is not specified.
      *
@@ -1332,7 +1397,7 @@ public abstract class CtClass {
     public final Class<?> toClass(ClassLoader loader)
         throws CannotCompileException
     {
-        return getClassPool().toClass(this, loader);
+        return getClassPool().toClass(this, null, loader, null);
     }
 
     /**
@@ -1405,7 +1470,7 @@ public abstract class CtClass {
      * @see ClassPool#doPruning
      *
      * @see #toBytecode()
-     * @see #toClass()
+     * @see #toClass(Class)
      * @see #writeFile()
      * @see #instrument(CodeConverter)
      * @see #instrument(ExprEditor)

src/main/javassist/CtClassType.java

@@ -1526,7 +1526,7 @@ class CtClassType extends CtClass {
         ClassFile cf = getClassFile2();
         ConstPool cp = cf.getConstPool();
         List<MethodInfo> methods = cf.getMethods();
-        for (MethodInfo minfo:methods)
+        for (MethodInfo minfo: methods.toArray(new MethodInfo[methods.size()]))
             converter.doit(this, minfo, cp);
     }
 
@@ -1537,7 +1537,7 @@ class CtClassType extends CtClass {
         checkModify();
         ClassFile cf = getClassFile2();
         List<MethodInfo> methods = cf.getMethods();
-        for (MethodInfo minfo:methods)
+        for (MethodInfo minfo: methods.toArray(new MethodInfo[methods.size()]))
             editor.doit(this, minfo);
     }
 

src/main/javassist/Loader.java

@@ -16,11 +16,12 @@
 
 package javassist;
 
+import java.io.IOException;
 import java.io.InputStream;
 import java.lang.reflect.InvocationTargetException;
 import java.security.ProtectionDomain;
 import java.util.Arrays;
-import java.util.Hashtable;
+import java.util.HashMap;
 import java.util.Vector;
 
 import javassist.bytecode.ClassFile;
@@ -138,7 +139,48 @@ import javassist.bytecode.ClassFile;
  * @see javassist.Translator
  */
 public class Loader extends ClassLoader {
-    private Hashtable<String,ClassLoader> notDefinedHere; // must be atomic.
+
+    /**
+     * A simpler class loader.
+     * This is a class loader that exposes the protected {@code defineClass()} method
+     * declared in {@code java.lang.ClassLoader}.  It provides a method similar to
+     * {@code CtClass#toClass()}.
+     *
+     * <p>When loading a class, this class loader delegates the work to the
+     * parent class loader unless the loaded classes are explicitly given
+     * by {@link #invokeDefineClass(CtClass)}.
+     * Note that a class {@code Foo} loaded by this class loader is
+     * different from the class with the same name {@code Foo} but loaded by
+     * another class loader.  This is Java's naming rule.
+     * </p>
+     *
+     * @since 3.24
+     */
+    public static class Simple extends ClassLoader {
+        /**
+         * Constructs a class loader.
+         */
+        public Simple() {}
+
+        /**
+         * Constructs a class loader.
+         * @param parent    the parent class loader.
+         */
+        public Simple(ClassLoader parent) {
+            super(parent);
+        }
+
+        /**
+         * Invokes the protected {@code defineClass()} in {@code ClassLoader}.
+         * It converts the given {@link CtClass} object into a {@code java.lang.Class} object.
+         */
+        public Class<?> invokeDefineClass(CtClass cc) throws IOException, CannotCompileException {
+            byte[] code = cc.toBytecode();
+            return defineClass(cc.getName(), code, 0, code.length);
+        }
+    }
+
+    private HashMap<String,ClassLoader> notDefinedHere; // must be atomic.
     private Vector<String> notDefinedPackages; // must be atomic.
     private ClassPool source;
     private Translator translator;
@@ -186,7 +228,7 @@ public class Loader extends ClassLoader {
     }
 
     private void init(ClassPool cp) {
-        notDefinedHere = new Hashtable<String,ClassLoader>();
+        notDefinedHere = new HashMap<String,ClassLoader>();
         notDefinedPackages = new Vector<String>();
         source = cp;
         translator = null;

src/main/javassist/Modifier.java

@@ -46,7 +46,7 @@ public class Modifier {
     public static final int ENUM      = AccessFlag.ENUM;
 
     /**
-     * Returns true if the modifiers include the <tt>public</tt>
+     * Returns true if the modifiers include the <code>public</code>
      * modifier.
      */
     public static boolean isPublic(int mod) {
@@ -54,7 +54,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>private</tt>
+     * Returns true if the modifiers include the <code>private</code>
      * modifier.
      */
     public static boolean isPrivate(int mod) {
@@ -62,7 +62,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>protected</tt>
+     * Returns true if the modifiers include the <code>protected</code>
      * modifier.
      */
     public static boolean isProtected(int mod) {
@@ -71,14 +71,14 @@ public class Modifier {
 
     /**
      * Returns true if the modifiers do not include either
-     * <tt>public</tt>, <tt>protected</tt>, or <tt>private</tt>.
+     * <code>public</code>, <code>protected</code>, or <code>private</code>.
      */
     public static boolean isPackage(int mod) {
         return (mod & (PUBLIC | PRIVATE | PROTECTED)) == 0;
     }
 
     /**
-     * Returns true if the modifiers include the <tt>static</tt>
+     * Returns true if the modifiers include the <code>static</code>
      * modifier.
      */
     public static boolean isStatic(int mod) {
@@ -86,7 +86,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>final</tt>
+     * Returns true if the modifiers include the <code>final</code>
      * modifier.
      */
     public static boolean isFinal(int mod) {
@@ -94,7 +94,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>synchronized</tt>
+     * Returns true if the modifiers include the <code>synchronized</code>
      * modifier.
      */
     public static boolean isSynchronized(int mod) {
@@ -102,7 +102,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>volatile</tt>
+     * Returns true if the modifiers include the <code>volatile</code>
      * modifier.
      */
     public static boolean isVolatile(int mod) {
@@ -110,7 +110,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>transient</tt>
+     * Returns true if the modifiers include the <code>transient</code>
      * modifier.
      */
     public static boolean isTransient(int mod) {
@@ -118,7 +118,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>native</tt>
+     * Returns true if the modifiers include the <code>native</code>
      * modifier.
      */
     public static boolean isNative(int mod) {
@@ -126,7 +126,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>interface</tt>
+     * Returns true if the modifiers include the <code>interface</code>
      * modifier.
      */
     public static boolean isInterface(int mod) {
@@ -134,7 +134,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>annotation</tt>
+     * Returns true if the modifiers include the <code>annotation</code>
      * modifier.
      *
      * @since 3.2
@@ -144,7 +144,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>enum</tt>
+     * Returns true if the modifiers include the <code>enum</code>
      * modifier.
      *
      * @since 3.2
@@ -154,7 +154,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>abstract</tt>
+     * Returns true if the modifiers include the <code>abstract</code>
      * modifier.
      */
     public static boolean isAbstract(int mod) {
@@ -162,7 +162,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>strictfp</tt>
+     * Returns true if the modifiers include the <code>strictfp</code>
      * modifier.
      */
     public static boolean isStrict(int mod) {
@@ -170,7 +170,7 @@ public class Modifier {
     }
 
     /**
-     * Returns true if the modifiers include the <tt>varargs</tt>
+     * Returns true if the modifiers include the <code>varargs</code>
      * (variable number of arguments) modifier.
      */
     public static boolean isVarArgs(int mod)  {

src/main/javassist/bytecode/AttributeInfo.java

@@ -108,6 +108,10 @@ public class AttributeInfo {
             /* Note that the names of Annotations attributes begin with 'R'. */
             if (nameStr.equals(MethodParametersAttribute.tag))
                 return new MethodParametersAttribute(cp, name, in);
+            else if (nameStr.equals(NestHostAttribute.tag))
+                return new NestHostAttribute(cp, name, in);
+            else if (nameStr.equals(NestMembersAttribute.tag))
+                return new NestMembersAttribute(cp, name, in);
             else if (nameStr.equals(AnnotationsAttribute.visibleTag)
                      || nameStr.equals(AnnotationsAttribute.invisibleTag))
                 // RuntimeVisibleAnnotations or RuntimeInvisibleAnnotations

src/main/javassist/bytecode/NestHostAttribute.java

+/*
+ * Javassist, a Java-bytecode translator toolkit.
+ * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License.  Alternatively, the contents of this file may be used under
+ * the terms of the GNU Lesser General Public License Version 2.1 or later,
+ * or the Apache License Version 2.0.
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ */
+
+package javassist.bytecode;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * <code>NestHost_attribute</code>.
+ * It was introduced by JEP-181.  See JVMS 4.7.28 for the specification.
+ *
+ * @since 3.24
+ */
+public class NestHostAttribute extends AttributeInfo {
+    /**
+     * The name of this attribute <code>"NestHost"</code>.
+     */
+    public static final String tag = "NestHost";
+
+    NestHostAttribute(ConstPool cp, int n, DataInputStream in) throws IOException {
+        super(cp, n, in);
+    }
+
+    private NestHostAttribute(ConstPool cp, int hostIndex) {
+        super(cp, tag, new byte[2]);
+        ByteArray.write16bit(hostIndex, get(), 0);
+    }
+
+    /**
+     * Makes a copy.  Class names are replaced according to the
+     * given <code>Map</code> object.
+     *
+     * @param newCp     the constant pool table used by the new copy.
+     * @param classnames        pairs of replaced and substituted
+     *                          class names.
+     */
+    @Override
+    public AttributeInfo copy(ConstPool newCp, Map<String, String> classnames) {
+        int hostIndex = ByteArray.readU16bit(get(), 0);
+        int newHostIndex = getConstPool().copy(hostIndex, newCp, classnames);
+        return new NestHostAttribute(newCp, newHostIndex);
+    }
+
+    /**
+     * Returns <code>host_class_index</code>.  The constant pool entry
+     * at this entry is a <code>CONSTANT_Class_info</code> structure.
+     * @return the value of <code>host_class_index</code>.
+     */
+    public int hostClassIndex() {
+        return ByteArray.readU16bit(info, 0);
+    }
+}

src/main/javassist/bytecode/NestMembersAttribute.java

+/*
+ * Javassist, a Java-bytecode translator toolkit.
+ * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License.  Alternatively, the contents of this file may be used under
+ * the terms of the GNU Lesser General Public License Version 2.1 or later,
+ * or the Apache License Version 2.0.
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ */
+
+package javassist.bytecode;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * <code>NestMembers_attribute</code>.
+ * It was introduced by JEP-181.  See JVMS 4.7.29 for the specification.
+ *
+ * @since 3.24
+ */
+public class NestMembersAttribute extends AttributeInfo {
+    /**
+     * The name of this attribute <code>"NestMembers"</code>.
+     */
+    public static final String tag = "NestMembers";
+
+    NestMembersAttribute(ConstPool cp, int n, DataInputStream in) throws IOException {
+        super(cp, n, in);
+    }
+
+    private NestMembersAttribute(ConstPool cp, byte[] info) {
+        super(cp, tag, info);
+    }
+
+    /**
+     * Makes a copy.  Class names are replaced according to the
+     * given <code>Map</code> object.
+     *
+     * @param newCp     the constant pool table used by the new copy.
+     * @param classnames        pairs of replaced and substituted
+     *                          class names.
+     */
+    @Override
+    public AttributeInfo copy(ConstPool newCp, Map<String, String> classnames) {
+        byte[] src = get();
+        byte[] dest = new byte[src.length];
+        ConstPool cp = getConstPool();
+
+        int n = ByteArray.readU16bit(src, 0);
+        ByteArray.write16bit(n, dest, 0);
+
+        for (int i = 0, j = 2; i < n; ++i, j += 2) {
+            int index = ByteArray.readU16bit(src, j);
+            int newIndex = cp.copy(index, newCp, classnames);
+            ByteArray.write16bit(newIndex, dest, j);
+        }
+
+        return new NestMembersAttribute(newCp, dest);
+    }
+
+    /**
+     * Returns <code>number_of_classes</code>.
+     * @return the number of the classes recorded in this attribute.
+     */
+    public int numberOfClasses() {
+        return ByteArray.readU16bit(info, 0);
+    }
+
+    /** Returns <code>classes[index]</code>.
+     * 
+     * @param index   the index into <code>classes</code>.
+     * @return the value at the given index in the <code>classes</code> array.
+     *   It is an index into the constant pool.
+     *   The constant pool entry at the returned index is a
+     *   <code>CONSTANT_Class_info</code> structure.
+     */
+    public int memberClass(int index) {
+        return ByteArray.readU16bit(info, index * 2 + 2);
+    }
+}

src/main/javassist/compiler/CodeGen.java

@@ -542,7 +542,23 @@ public abstract class CodeGen extends Visitor implements Opcode, TokenId {
     }
 
     private void atSwitchStmnt(Stmnt st) throws CompileError {
+        boolean isString = false;
+        if (typeChecker != null) {
+            doTypeCheck(st.head());
+            isString = typeChecker.exprType == TypeChecker.CLASS
+                       && typeChecker.arrayDim == 0
+                       && TypeChecker.jvmJavaLangString.equals(typeChecker.className);
+        }
+
         compileExpr(st.head());
+        int tmpVar = -1;
+        if (isString) {
+            tmpVar = getMaxLocals();
+            incMaxLocals(1);
+            bytecode.addAstore(tmpVar);
+            bytecode.addAload(tmpVar);
+            bytecode.addInvokevirtual(TypeChecker.jvmJavaLangString, "hashCode", "()I");
+        }
 
         List<Integer>  prevBreakList = breakList;
         breakList = new ArrayList<Integer>();
@@ -565,6 +581,7 @@ public abstract class CodeGen extends Visitor implements Opcode, TokenId {
         bytecode.addGap(npairs * 8);
 
         long[] pairs = new long[npairs];
+        ArrayList<Integer> gotoDefaults = new ArrayList<Integer>();
         int ipairs = 0;
         int defaultPc = -1;
         for (ASTList list = body; list != null; list = list.tail()) {
@@ -575,9 +592,18 @@ public abstract class CodeGen extends Visitor implements Opcode, TokenId {
             else if (op != CASE)
                 fatal();
             else {
+                int curPos = bytecode.currentPc();
+                long caseLabel;
+                if (isString) {
+                    // computeStringLabel() also adds bytecode as its side-effects.
+                    caseLabel = (long)computeStringLabel(label.head(), tmpVar, gotoDefaults);
+                }
+                else
+                    caseLabel = (long)computeLabel(label.head());
+
                 pairs[ipairs++]
-                    = ((long)computeLabel(label.head()) << 32) + 
-                      ((long)(bytecode.currentPc() - opcodePc) & 0xffffffff);
+                    = (caseLabel << 32) + 
+                      ((long)(curPos - opcodePc) & 0xffffffff);
             }
 
             hasReturned = false;
@@ -600,6 +626,8 @@ public abstract class CodeGen extends Visitor implements Opcode, TokenId {
             defaultPc = endPc;
 
         bytecode.write32bit(opcodePc2, defaultPc - opcodePc);
+        for (int addr: gotoDefaults)
+            bytecode.write16bit(addr, defaultPc - addr + 1);
 
         patchGoto(breakList, endPc);
         breakList = prevBreakList;
@@ -613,6 +641,26 @@ public abstract class CodeGen extends Visitor implements Opcode, TokenId {
         throw new CompileError("bad case label");
     }
 
+    private int computeStringLabel(ASTree expr, int tmpVar, List<Integer> gotoDefaults)
+        throws CompileError
+    {
+        doTypeCheck(expr);
+        expr = TypeChecker.stripPlusExpr(expr);
+        if (expr instanceof StringL) {
+            String label = ((StringL)expr).get();
+            bytecode.addAload(tmpVar);
+            bytecode.addLdc(label);
+            bytecode.addInvokevirtual(TypeChecker.jvmJavaLangString, "equals",
+                                      "(Ljava/lang/Object;)Z");
+            bytecode.addOpcode(IFEQ);
+            Integer pc = Integer.valueOf(bytecode.currentPc());
+            bytecode.addIndex(0);
+            gotoDefaults.add(pc);
+            return (int)label.hashCode();
+        }
+        throw new CompileError("bad case label");
+    }
+
     private void atBreakStmnt(Stmnt st, boolean notCont)
         throws CompileError
     {

src/main/javassist/compiler/MemberCodeGen.java

@@ -636,10 +636,24 @@ public class MemberCodeGen extends CodeGen {
                 throw new CompileError("no such constructor: " + targetClass.getName());
 
             if (declClass != thisClass && AccessFlag.isPrivate(acc)) {
+                boolean isNested = false;
+                if (declClass.getClassFile().getMajorVersion() >= ClassFile.JAVA_11) {
+                    try {
+                        CtClass[] nestedClasses = declClass.getNestedClasses();
+                        for (int i = 0; i < nestedClasses.length; i++) {
+                            if (thisClass == nestedClasses[i]) {
+                                isNested = true;
+                                break;
+                            }
+                        }
+                    } catch (NotFoundException ignored) { }
+                }
+                if (!isNested) {
                     desc = getAccessibleConstructor(desc, declClass, minfo);
                     bytecode.addOpcode(Opcode.ACONST_NULL); // the last parameter
                 }
             }
+        }
         else if (AccessFlag.isPrivate(acc))
             if (declClass == thisClass)
                 isSpecial = true;