8004584: Augment applet contextualization

Do not create the main AppContext for applets

Reviewed-by: art, ahgross

jdk/src/share/classes/java/util/logging/LogManager.java

@@ -394,27 +394,23 @@ public class LogManager {
                 // from the execution stack.
                 Object ecx = javaAwtAccess.getExecutionContext();
                 if (ecx == null) {
-                    // fall back to AppContext.getAppContext()
+                    // fall back to thread group seach of AppContext
                     ecx = javaAwtAccess.getContext();
                 }
-                context = (LoggerContext)javaAwtAccess.get(ecx, LoggerContext.class);
+                if (ecx != null) {
-                if (context == null) {
+                    context = (LoggerContext)javaAwtAccess.get(ecx, LoggerContext.class);
-                    if (javaAwtAccess.isMainAppContext()) {
+                    if (context == null) {
-                        context = userContext;
+                        if (javaAwtAccess.isMainAppContext()) {
-                    } else {
+                            context = userContext;
-                        context = new LoggerContext();
+                        } else {
-                        // during initialization, rootLogger is null when
+                            context = new LoggerContext();
-                        // instantiating itself RootLogger
+                        }
-                        if (manager.rootLogger != null)
+                        javaAwtAccess.put(ecx, LoggerContext.class, context);
-                            context.addLocalLogger(manager.rootLogger);
                     }
-                    javaAwtAccess.put(ecx, LoggerContext.class, context);
                 }
             }
-        } else {
-            context = userContext;
         }
-        return context;
+        return context != null ? context : userContext;
     }
 
     private List<LoggerContext> contexts() {
@@ -539,9 +535,22 @@ public class LogManager {
             return logger;
         }
 
+        synchronized void ensureRootLogger(Logger logger) {
+            if (logger == manager.rootLogger)
+                return;
+
+            // during initialization, rootLogger is null when
+            // instantiating itself RootLogger
+            if (findLogger("") == null && manager.rootLogger != null) {
+                addLocalLogger(manager.rootLogger);
+            }
+        }
+
         // Add a logger to this context.  This method will only set its level
         // and process parent loggers.  It doesn't set its handlers.
         synchronized boolean addLocalLogger(Logger logger) {
+            ensureRootLogger(logger);
+
             final String name = logger.getName();
             if (name == null) {
                 throw new NullPointerException();

jdk/src/share/classes/sun/applet/AppletSecurity.java

@@ -52,7 +52,6 @@ import sun.security.util.SecurityConstants;
  */
 public
 class AppletSecurity extends AWTSecurityManager {
-    private AppContext mainAppContext;
 
     //URLClassLoader.acc
     private static Field facc = null;
@@ -77,7 +76,6 @@ class AppletSecurity extends AWTSecurityManager {
      */
     public AppletSecurity() {
         reset();
-        mainAppContext = AppContext.getAppContext();
     }
 
     // Cache to store known restricted packages
@@ -312,7 +310,7 @@ class AppletSecurity extends AWTSecurityManager {
         AppContext appContext = AppContext.getAppContext();
         AppletClassLoader appletClassLoader = currentAppletClassLoader();
 
-        if ((appContext == mainAppContext) && (appletClassLoader != null)) {
+        if (AppContext.isMainContext(appContext) && (appletClassLoader != null)) {
             // If we're about to allow access to the main EventQueue,
             // and anything untrusted is on the class context stack,
             // disallow access.

jdk/src/share/classes/sun/awt/AppContext.java

@@ -162,7 +162,8 @@ public final class AppContext {
     }
 
     /* The main "system" AppContext, used by everything not otherwise
-       contained in another AppContext.
+       contained in another AppContext. It is implicitly created for
+       standalone apps only (i.e. not applets)
      */
     private static volatile AppContext mainAppContext = null;
 
@@ -204,25 +205,6 @@ public final class AppContext {
      */
     private static final AtomicInteger numAppContexts = new AtomicInteger(0);
 
-    static {
-        // On the main Thread, we get the ThreadGroup, make a corresponding
-        // AppContext, and instantiate the Java EventQueue.  This way, legacy
-        // code is unaffected by the move to multiple AppContext ability.
-        AccessController.doPrivileged(new PrivilegedAction<Void>() {
-            public Void run() {
-                ThreadGroup currentThreadGroup =
-                        Thread.currentThread().getThreadGroup();
-                ThreadGroup parentThreadGroup = currentThreadGroup.getParent();
-                while (parentThreadGroup != null) {
-                    // Find the root ThreadGroup to construct our main AppContext
-                    currentThreadGroup = parentThreadGroup;
-                    parentThreadGroup = currentThreadGroup.getParent();
-                }
-                mainAppContext = new AppContext(currentThreadGroup);
-                return null;
-            }
-        });
-    }
 
     /*
      * The context ClassLoader that was used to create this AppContext.
@@ -266,6 +248,27 @@ public final class AppContext {
     private static final ThreadLocal<AppContext> threadAppContext =
             new ThreadLocal<AppContext>();
 
+    private final static void initMainAppContext() {
+        // On the main Thread, we get the ThreadGroup, make a corresponding
+        // AppContext, and instantiate the Java EventQueue.  This way, legacy
+        // code is unaffected by the move to multiple AppContext ability.
+        AccessController.doPrivileged(new PrivilegedAction<Void>() {
+            public Void run() {
+                ThreadGroup currentThreadGroup =
+                        Thread.currentThread().getThreadGroup();
+                ThreadGroup parentThreadGroup = currentThreadGroup.getParent();
+                while (parentThreadGroup != null) {
+                    // Find the root ThreadGroup to construct our main AppContext
+                    currentThreadGroup = parentThreadGroup;
+                    parentThreadGroup = currentThreadGroup.getParent();
+                }
+
+                mainAppContext = SunToolkit.createNewAppContext(currentThreadGroup);
+                return null;
+            }
+        });
+    }
+
     /**
      * Returns the appropriate AppContext for the caller,
      * as determined by its ThreadGroup.  If the main "system" AppContext
@@ -278,8 +281,10 @@ public final class AppContext {
      * @since   1.2
      */
     public final static AppContext getAppContext() {
-        if (numAppContexts.get() == 1)   // If there's only one system-wide,
+        // we are standalone app, return the main app context
-            return mainAppContext; // return the main system AppContext.
+        if (numAppContexts.get() == 1 && mainAppContext != null) {
+            return mainAppContext;
+        }
 
         AppContext appContext = threadAppContext.get();
 
@@ -293,29 +298,37 @@ public final class AppContext {
                     // when new AppContext objects are created.
                     ThreadGroup currentThreadGroup = Thread.currentThread().getThreadGroup();
                     ThreadGroup threadGroup = currentThreadGroup;
+
+                    // Special case: we implicitly create the main app context
+                    // if no contexts have been created yet. This covers standalone apps
+                    // and excludes applets because by the time applet starts
+                    // a number of contexts have already been created by the plugin.
+                    if (numAppContexts.get() == 0) {
+                        // This check is not necessary, its purpose is to help
+                        // Plugin devs to catch all the cases of main AC creation.
+                        if (System.getProperty("javaplugin.version") == null &&
+                                System.getProperty("javawebstart.version") == null) {
+                            initMainAppContext();
+                        }
+                    }
+
                     AppContext context = threadGroup2appContext.get(threadGroup);
                     while (context == null) {
                         threadGroup = threadGroup.getParent();
                         if (threadGroup == null) {
-                            // If we get here, we're running under a ThreadGroup that
+                            return null;
-                            // has no AppContext associated with it.  This should never
-                            // happen, because createNewContext() should be used by the
-                            // toolkit to create the ThreadGroup that everything runs
-                            // under.
-                            throw new RuntimeException("Invalid ThreadGroup");
                         }
                         context = threadGroup2appContext.get(threadGroup);
                     }
+
                     // In case we did anything in the above while loop, we add
                     // all the intermediate ThreadGroups to threadGroup2appContext
                     // so we won't spin again.
                     for (ThreadGroup tg = currentThreadGroup; tg != threadGroup; tg = tg.getParent()) {
                         threadGroup2appContext.put(tg, context);
                     }
+
                     // Now we're done, so we cache the latest key/value pair.
-                    // (we do this before checking with any AWTSecurityManager, so if
-                    // this Thread equates with the main AppContext in the cache, it
-                    // still will)
                     threadAppContext.set(context);
 
                     return context;
@@ -323,19 +336,20 @@ public final class AppContext {
             });
         }
 
-        if (appContext == mainAppContext)  {
-            // Before we return the main "system" AppContext, check to
-            // see if there's an AWTSecurityManager installed.  If so,
-            // allow it to choose the AppContext to return.
-            AppContext secAppContext = getExecutionAppContext();
-            if (secAppContext != null) {
-                appContext = secAppContext; // Return what we're told
-            }
-        }
-
         return appContext;
     }
 
+    /**
+     * Returns true if the specified AppContext is the main AppContext.
+     *
+     * @param   ctx the context to compare with the main context
+     * @return  true if the specified AppContext is the main AppContext.
+     * @since   1.8
+     */
+    public final static boolean isMainContext(AppContext ctx) {
+        return (ctx != null && ctx == mainAppContext);
+    }
+
     private final static AppContext getExecutionAppContext() {
         SecurityManager securityManager = System.getSecurityManager();
         if ((securityManager != null) &&
@@ -348,16 +362,6 @@ public final class AppContext {
         return null;
     }
 
-    /**
-     * Returns the main ("system") AppContext.
-     *
-     * @return  the main AppContext
-     * @since   1.8
-     */
-    final static AppContext getMainAppContext() {
-        return mainAppContext;
-    }
-
     private long DISPOSAL_TIMEOUT = 5000;  // Default to 5-second timeout
                                            // for disposal of all Frames
                                            // (we wait for this time twice,
@@ -810,7 +814,7 @@ public final class AppContext {
                 return getAppContext().isDisposed();
             }
             public boolean isMainAppContext() {
-                return (numAppContexts.get() == 1);
+                return (numAppContexts.get() == 1 && mainAppContext != null);
             }
             public Object getContext() {
                 return getAppContext();

jdk/src/share/classes/sun/awt/SunToolkit.java

@@ -117,8 +117,6 @@ public abstract class SunToolkit extends Toolkit
     }
 
     public SunToolkit() {
-        // 7122796: Always create an EQ for the main AppContext
-        initEQ(AppContext.getMainAppContext());
     }
 
     public boolean useBufferPerWindow() {
@@ -281,11 +279,14 @@ public abstract class SunToolkit extends Toolkit
      */
     public static AppContext createNewAppContext() {
         ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
+        return createNewAppContext(threadGroup);
+    }
+
+    static final AppContext createNewAppContext(ThreadGroup threadGroup) {
         // Create appContext before initialization of EventQueue, so all
         // the calls to AppContext.getAppContext() from EventQueue ctor
         // return correct values
         AppContext appContext = new AppContext(threadGroup);
-
         initEQ(appContext);
 
         return appContext;