access class sun.nio.ch.DirectBuffer in priveledged action, attempt to avoid (IDEA-146944 Internal error trying to build a java 9 project )

(cherry picked from commit 68ce925)

platform/util/src/com/intellij/util/io/DirectBufferWrapper.java

@@ -54,21 +54,23 @@ public abstract class DirectBufferWrapper extends ByteBufferWrapper {
   @Override
   public void unmap() {
     if (isDirty()) flush();
-    if (myBuffer != null) disposeDirectBuffer((DirectBuffer)myBuffer);
+    if (myBuffer != null) disposeDirectBuffer(myBuffer);
     myBuffer = null;
   }
 
- static boolean disposeDirectBuffer(final DirectBuffer buffer) {
+ static boolean disposeDirectBuffer(final ByteBuffer buffer) {
     return AccessController.doPrivileged(new PrivilegedAction<Object>() {
       @Override
       @Nullable
       public Object run() {
         try {
-          Cleaner cleaner = buffer.cleaner();
-          if (cleaner != null) cleaner.clean(); // Already cleaned otherwise
+          if (buffer instanceof DirectBuffer) {
+            Cleaner cleaner = ((DirectBuffer)buffer).cleaner();
+            if (cleaner != null) cleaner.clean(); // Already cleaned otherwise
+          }
           return null;
         }
-        catch (Exception e) {
+        catch (Throwable e) {
           return buffer;
         }
       }

platform/util/src/com/intellij/util/io/MappedBufferWrapper.java

@@ -17,7 +17,6 @@ package com.intellij.util.io;
 
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.util.TimeoutUtil;
-import sun.nio.ch.DirectBuffer;
 
 import java.io.File;
 import java.io.IOException;
@@ -78,7 +77,7 @@ public abstract class MappedBufferWrapper extends ByteBufferWrapper {
       return false;
     }
 
-    return DirectBufferWrapper.disposeDirectBuffer((DirectBuffer)buffer);
+    return DirectBufferWrapper.disposeDirectBuffer(buffer);
   }
 
   private static boolean tryForce(MappedByteBuffer buffer) {