ARTEMIS-1650 Fixing Testsuite on PageReference

Transactions may initialize a PagedReference without a valid message yet
during load of prepared transactions.

Caching has to be lazy on this case and it should load on demand.

artemis-server/src/main/java/org/apache/activemq/artemis/core/paging/cursor/PagedReferenceImpl.java

@@ -53,11 +53,11 @@ public class PagedReferenceImpl extends LinkedListImpl.Node<PagedReferenceImpl>
 
    private Object protocolData;
 
-   private final boolean largeMessage;
+   private Boolean largeMessage;
 
-   private final long transactionID;
+   private long transactionID = -1;
 
-   private final long messageID;
+   private long messageID = -1;
 
    private long messageSize = -1;
 
@@ -103,12 +103,19 @@ public class PagedReferenceImpl extends LinkedListImpl.Node<PagedReferenceImpl>
       this.position = position;
       this.message = new WeakReference<>(message);
       this.subscription = subscription;
+      if (message != null) {
          this.largeMessage = message.getMessage().isLargeMessage();
          this.transactionID = message.getTransactionID();
          this.messageID = message.getMessage().getMessageID();
 
          //pre-cache the message size so we don't have to reload the message later if it is GC'd
          getPersistentSize();
+      } else {
+         this.largeMessage = null;
+         this.transactionID = -1;
+         this.messageID = -1;
+         this.messageSize = -1;
+      }
    }
 
    @Override
@@ -272,16 +279,25 @@ public class PagedReferenceImpl extends LinkedListImpl.Node<PagedReferenceImpl>
 
    @Override
    public boolean isLargeMessage() {
+      if (largeMessage == null && message != null) {
+         largeMessage = getMessage().isLargeMessage();
+      }
       return largeMessage;
    }
 
    @Override
    public long getTransactionID() {
+      if (transactionID < 0) {
+         transactionID = getPagedMessage().getTransactionID();
+      }
       return transactionID;
    }
 
    @Override
    public long getMessageID() {
+      if (messageID < 0) {
+         messageID = getPagedMessage().getMessage().getMessageID();
+      }
       return messageID;
    }