Add sync to loadClass.

Author: hq6

framework/src/main/java/org/apache/felix/framework/BundleWiringImpl.java

@@ -1967,44 +1967,46 @@ public BundleImpl getBundle()
         protected Class loadClass(String name, boolean resolve)
                 throws ClassNotFoundException
         {
+          synchronized (getClassLoadingLock(name)) {
             Class clazz = findLoadedClass(name);
 
             if (clazz == null)
             {
-                try
-                {
-                    clazz = (Class) m_wiring.findClassOrResourceByDelegation(name, true);
-                }
-                catch (ResourceNotFoundException ex)
-                {
-                    // This should never happen since we are asking for a class,
-                    // so just ignore it.
-                }
-                catch (ClassNotFoundException cnfe)
-                {
-                    ClassNotFoundException ex = cnfe;
-                    if (m_logger.getLogLevel() >= Logger.LOG_DEBUG)
-                    {
-                        String msg = diagnoseClassLoadError(m_wiring.m_resolver, m_wiring.m_revision, name);
-                        ex = (msg != null)
-                                ? new ClassNotFoundException(msg, cnfe)
-                                        : ex;
-                    }
-                    throw ex;
-                }
-                if (clazz == null)
+              try
+              {
+                clazz = (Class) m_wiring.findClassOrResourceByDelegation(name, true);
+              }
+              catch (ResourceNotFoundException ex)
+              {
+                // This should never happen since we are asking for a class,
+                // so just ignore it.
+              }
+              catch (ClassNotFoundException cnfe)
+              {
+                ClassNotFoundException ex = cnfe;
+                if (m_logger.getLogLevel() >= Logger.LOG_DEBUG)
                 {
-                    // We detected a cycle
-                    throw new ClassNotFoundException("Cycle detected while trying to load class: " + name);
+                  String msg = diagnoseClassLoadError(m_wiring.m_resolver, m_wiring.m_revision, name);
+                  ex = (msg != null)
+                    ? new ClassNotFoundException(msg, cnfe)
+                    : ex;
                 }
+                throw ex;
+              }
+              if (clazz == null)
+              {
+                // We detected a cycle
+                throw new ClassNotFoundException("Cycle detected while trying to load class: " + name);
+              }
             }
 
             // Resolve the class and return it.
             if (resolve)
             {
-                resolveClass(clazz);
+              resolveClass(clazz);
             }
             return clazz;
+          }
         }
 
         @Override