ptupitsyn commented on a change in pull request #9271:
URL: https://github.com/apache/ignite/pull/9271#discussion_r676448008



##########
File path: 
modules/core/src/main/java/org/apache/ignite/internal/processors/platform/cache/query/PlatformContinuousQueryImpl.java
##########
@@ -142,8 +142,10 @@ private static CacheEntryEventFilter getJavaFilter(Object 
filter, GridKernalCont
 
                 qry.setLocalListener(this);
 
-                //noinspection deprecation
-                qry.setRemoteFilter(this); // Filter must be set always for 
correct resource release.
+                if (hasFilter || javaFilter != null) {
+                    //noinspection deprecation
+                    qry.setRemoteFilter(this); // Filter must be set always 
for correct resource release.

Review comment:
       Please note the comment: we can't make this call conditional. If we 
don't call `setRemoteFilter`, then `onQueryUnregister()` won't be called and 
platform resources won't be released.
   
   I think we should fix `SecurityAwareFilter` instead to handle nulls 
correctly.
   
   Alternatively, fix `writeReplace` to write a dummy filter instead of null, 
but this will affect performance.




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