This closes #1313

artemis-jdbc-store/src/main/java/org/apache/activemq/artemis/jdbc/store/file/JDBCSequentialFile.java

@@ -45,7 +45,7 @@ public class JDBCSequentialFile implements SequentialFile {
 
    private boolean isOpen = false;
 
-   private boolean isCreated = false;
+   private boolean isLoaded = false;
 
    private long id = -1;
 
@@ -88,7 +88,7 @@ public class JDBCSequentialFile implements SequentialFile {
 
    @Override
    public boolean exists() {
-      if (isCreated) return true;
+      if (isLoaded) return true;
       try {
          return fileFactory.listFiles(extension).contains(filename);
       } catch (Exception e) {
@@ -100,13 +100,17 @@ public class JDBCSequentialFile implements SequentialFile {
 
    @Override
    public void open() throws Exception {
-      try {
-         if (!isOpen) {
-            synchronized (writeLock) {
-               dbDriver.openFile(this);
-               isCreated = true;
+      load();
       isOpen = true;
    }
+
+   private void load() {
+      try {
+         synchronized (writeLock) {
+            if (!isLoaded) {
+               dbDriver.openFile(this);
+               isLoaded = true;
+            }
          }
       } catch (SQLException e) {
          fileFactory.onIOError(e, "Error attempting to open JDBC file.", this);
@@ -141,11 +145,10 @@ public class JDBCSequentialFile implements SequentialFile {
    @Override
    public void delete() throws IOException, InterruptedException, ActiveMQException {
       try {
-         if (isCreated) {
          synchronized (writeLock) {
+            load();
             dbDriver.deleteFile(this);
          }
-         }
       } catch (SQLException e) {
          fileFactory.onIOError(e, "Error deleting JDBC file.", this);
       }
@@ -298,6 +301,7 @@ public class JDBCSequentialFile implements SequentialFile {
 
    @Override
    public long size() throws Exception {
+      load();
       return writePosition;
    }
 

artemis-jdbc-store/src/test/java/org/apache/activemq/artemis/jdbc/file/JDBCSequentialFileFactoryTest.java

@@ -186,6 +186,36 @@ public class JDBCSequentialFileFactoryTest {
       assertEquals(bufferSize, file.size());
    }
 
+   /**
+    * Using a real file system users are not required to call file.open() in order to read the file size.  The file
+    * descriptor has enough information.  However, with JDBC we do require that some information is loaded in order to
+    * get the underlying BLOB.  This tests ensures that file.size() returns the correct value, without the user calling
+    * file.open() with JDBCSequentialFile.
+    *
+    * @throws Exception
+    */
+   @Test
+   public void testGetFileSizeWorksWhenNotOpen() throws Exception {
+      // Create test file with some data.
+      int testFileSize = 1024;
+      String fileName = "testFile.txt";
+      SequentialFile file = factory.createSequentialFile(fileName);
+      file.open();
+
+      // Write some data to the file
+      ActiveMQBuffer buffer = ActiveMQBuffers.wrappedBuffer(new byte[1024]);
+      file.write(buffer, true);
+      file.close();
+
+      try {
+         // Create a new pointer to the test file and ensure file.size() returns the correct value.
+         SequentialFile file2 = factory.createSequentialFile(fileName);
+         assertEquals(testFileSize, file2.size());
+      } catch (Throwable t) {
+         t.printStackTrace();
+      }
+   }
+
    private void checkData(JDBCSequentialFile file, ActiveMQBuffer expectedData) throws SQLException {
       expectedData.resetReaderIndex();