[jira] [Commented] (IGNITE-3935) ClassLoaders are not switched during object deserialization

["Denis Magda (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-3935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15505836#comment-15505836 ] 

Denis Magda commented on IGNITE-3935:
-------------------------------------

The issue was reported from a StackOverflow discussion
http://stackoverflow.com/questions/39539835/apache-ignite-serialization-error-related-to-data-streaming/39547964?noredirect=1#comment66427481_39547964

> ClassLoaders are not switched during object deserialization
> -----------------------------------------------------------
>
>                 Key: IGNITE-3935
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3935
>             Project: Ignite
>          Issue Type: Bug
>          Components: binary
>    Affects Versions: 1.6
>            Reporter: Denis Magda
>
> If an object is being deserialized with ClassLoader A then this ClassLoader A will be used for the deserialization of the whole object's state, i.e., including all its fields that can be custom objects loaded by ClassLoader B. 
> In a basic scenario we can have an object of some Ignite class that is presented in the classpath. That Ignite class may enclose an object that is loaded by peer-class-loading class loader. The deserialization will fail because Ignite won't switch to the peer-class-loading loader when it's needed.
> To reproduce the issue do the following:
> 1. Start a remote ignite node using {{./ignite.sh ../examples/config/example-ignite.xml}}
> 2. Run the code below
> {code}
> public class StreamingExample {`
> public static class StreamingExampleCacheEntryProcessor implements CacheEntryProcessor<String, Long, Object> {
>     @Override
>     public Object process(MutableEntry<String, Long> e, Object... arg) throws EntryProcessorException {
>         Long val = e.getValue();
>         e.setValue(val == null ? 1L : val + 1);
>         return null;
>     }
> }
> public static void main(String[] args) throws IgniteException, IOException {
>     Ignition.setClientMode(true);
>     try (Ignite ignite = Ignition.start("examples/config/example-ignite.xml")) {
>         IgniteCache<String, Long> stmCache = ignite.getOrCreateCache("mycache");
>         try (IgniteDataStreamer<String, Long> stmr = ignite.dataStreamer(stmCache.getName())) {
>             stmr.allowOverwrite(true);
>             stmr.receiver(StreamTransformer.from(new StreamingExampleCacheEntryProcessor()));
>             stmr.addData("word", 1L);
>             System.out.println("Finished");
>         }
>     }
> }
> {code}
> However if to modify this code to the following everything will work fine 
> {code}
> public class StreamingExample {
>     public static class StreamingExampleCacheEntryProcessor extends StreamTransformer<String, Long> {
>         @Override
>         public Object process(MutableEntry<String, Long> e, Object... arg) throws EntryProcessorException {
>             System.out.println("Executed!");
>             Long val = e.getValue();
>             e.setValue(val == null ? 1L : val + 1);
>             return null;
>         }
>     }
>     public static void main(String[] args) throws IgniteException, IOException {
>         Ignition.setClientMode(true);
>         try (Ignite ignite = Ignition.start("examples/config/example-ignite.xml")) {
>             IgniteCache<String, Long> stmCache = ignite.getOrCreateCache("mycache");
>             try (IgniteDataStreamer<String, Long> stmr = ignite.dataStreamer(stmCache.getName())) {
>                 stmr.allowOverwrite(true);
>                 stmr.receiver(new StreamingExampleCacheEntryProcessor());
>                 stmr.addData("word", 1L);
>                 System.out.println("Finished");
>             }
>         }
>     }
> }
> {code}



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)