[jira] [Resolved] (AMQ-5816) NPE during sending a message when using http transport and leveldb store

["Timothy Bish (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMQ-5816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Timothy Bish resolved AMQ-5816.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 5.12.0
         Assignee: Timothy Bish

Patch applied, added a test to cover.  Thanks!

> NPE during sending a message when using http transport and leveldb store
> ------------------------------------------------------------------------
>
>                 Key: AMQ-5816
>                 URL: https://issues.apache.org/jira/browse/AMQ-5816
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: activemq-leveldb-store, Broker
>    Affects Versions: 5.11.0, 5.11.1
>            Reporter: Ievgen Tarasov
>            Assignee: Timothy Bish
>             Fix For: 5.12.0
>
>         Attachments: Exception, http-leveldb.patch
>
>
> It is impossible to use combination of HTTP transport with LevelDB as persistent store: when trying to send a persistent message the broker throws a NullPointerException (see attachment Exception).
> This happens because HTTP transport uses XStream library for deserealization, which follows Java Serialization rules. As a result, transient field [dataLocator|https://github.com/apache/activemq/blob/activemq-5.11.1/activemq-client/src/main/java/org/apache/activemq/command/MessageId.java#L37] is null after deserialization. Later, LevelDB invokes getDataLocator, and that's when NPE is thrown.
> Proposed patch adds private method readResolve, which is invoked after deserialization, and which initializes dataLocator field.



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