Github user poornachandra commented on a diff in the pull request:

    https://github.com/apache/incubator-tephra/pull/2#discussion_r77901080
  
    --- Diff: 
tephra-core/src/main/java/org/apache/tephra/runtime/TransactionInMemoryModule.java
 ---
    @@ -43,10 +44,12 @@ public TransactionInMemoryModule() {
     
       @Override
       protected void configure() {
    -    bind(SnapshotCodecProvider.class).in(Singleton.class);
    -    
bind(TransactionStateStorage.class).to(NoOpTransactionStateStorage.class).in(Singleton.class);
    -    bind(TransactionManager.class).in(Singleton.class);
    -    
bind(TransactionSystemClient.class).to(InMemoryTxSystemClient.class).in(Singleton.class);
    +    // some of these classes need to be non-singleton in order to create a 
new instance during leader() in
    +    // TransactionService
    +    bind(SnapshotCodecProvider.class).in(Scopes.SINGLETON);
    +    
bind(TransactionStateStorage.class).to(NoOpTransactionStateStorage.class);
    +    bind(TransactionManager.class);
    +    bind(TransactionSystemClient.class).to(InMemoryTxSystemClient.class);
    --- End diff --
    
    This also needs to be singleton


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