fixes another bug (supporting jdk.*) reported in #228

Readme.html

@@ -281,9 +281,15 @@ see javassist.Dump.
 
 <h2>Changes</h2>
 
+<p>-version 3.25
+<ul>
+    <li>GitHub Issue #228</li>
+<ul>
+</p>
+
 <p>-version 3.24 on November 1, 2018
 <ul>
-	<li>Java 11 supports.</li>
+    <li>Java 11 supports.</li>
     <li>JIRA JASSIST-267.</li>
     <li>Github PR #218.</li>
 </ul>

src/main/javassist/util/proxy/ProxyFactory.java

@@ -622,7 +622,7 @@ public class ProxyFactory {
      * {@code java.lang.invoke.MethodHandles.Lookup}.
      */
     private Class<?> getClassInTheSamePackage() {
-        if (basename.startsWith("javassist.util.proxy."))       // maybe the super class is java.*
+        if (basename.startsWith(packageForJavaBase))       // maybe the super class is java.*
             return this.getClass();
         else if (superClass != null && superClass != OBJECT_TYPE)
             return superClass;
@@ -921,10 +921,15 @@ public class ProxyFactory {
         if (Modifier.isFinal(superClass.getModifiers()))
             throw new RuntimeException(superName + " is final");
 
-        if (basename.startsWith("java.") || onlyPublicMethods)
-            basename = "javassist.util.proxy." + basename.replace('.', '_');
+        // Since java.base module is not opened, its proxy class should be
+        // in a different (open) module.  Otherwise, it could not be created
+        // by reflection.
+        if (basename.startsWith("java.") || basename.startsWith("jdk.") || onlyPublicMethods)
+            basename = packageForJavaBase + basename.replace('.', '_');
     }
 
+    private static final String packageForJavaBase = "javassist.util.proxy.";
+
     private void allocateClassName() {
         classname = makeProxyName(basename);
     }

src/test/javassist/proxyfactory/ProxyFactoryTest.java

@@ -140,4 +140,16 @@ public class ProxyFactoryTest extends TestCase {
             }
         });
     }
+
+    public void testJava11jdk() throws Exception {
+        ProxyFactory factory = new ProxyFactory();
+        factory.setSuperclass(jdk.javadoc.doclet.StandardDoclet.class);
+        jdk.javadoc.doclet.StandardDoclet e = (jdk.javadoc.doclet.StandardDoclet)factory.create(null, null, new MethodHandler() {
+            @Override
+            public Object invoke(Object self, Method thisMethod,
+                    Method proceed, Object[] args) throws Throwable {
+                return proceed.invoke(self, args);
+            }
+        });
+    }
 }