Use final and internal visibility where possible.

Author: asfernandes

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/BlobConnection.java

@@ -39,7 +39,7 @@
  *
  * @author <a href="mailto:adrianosf@gmail.com">Adriano dos Santos Fernandes</a>
  */
-public class BlobConnection extends URLConnection
+final class BlobConnection extends URLConnection
 {
 	private static final Logger log = LoggerFactory.getLogger(BlobConnection.class);
 

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/CloseableMemory.java

@@ -26,7 +26,7 @@
  *
  * @author asfernandes
  */
-class CloseableMemory extends Memory implements AutoCloseable
+final class CloseableMemory extends Memory implements AutoCloseable
 {
 	public CloseableMemory(long size)
 	{

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/DbClassLoader.java

@@ -35,7 +35,7 @@
  *
  * @author <a href="mailto:adrianosf@gmail.com">Adriano dos Santos Fernandes</a>
  */
-final public class DbClassLoader extends URLClassLoader
+final class DbClassLoader extends URLClassLoader
 {
 	private FBConnection connection;
 

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/ExternalEngine.java

@@ -64,7 +64,7 @@
 import com.sun.jna.Pointer;
 
 
-class ExternalEngine implements IExternalEngineIntf
+final class ExternalEngine implements IExternalEngineIntf
 {
 	private static final EncodingFactory encodingFactory = EncodingFactory.getDefaultInstance();
 	private static Map<String, SharedData> sharedDataMap = new ConcurrentHashMap<>();

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/ExternalFunction.java

@@ -28,7 +28,7 @@
 import com.sun.jna.Pointer;
 
 
-class ExternalFunction implements IExternalFunctionIntf
+final class ExternalFunction implements IExternalFunctionIntf
 {
 	private IExternalFunction wrapper;
 	private Routine routine;

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/ExternalProcedure.java

@@ -32,7 +32,7 @@
 import com.sun.jna.Pointer;
 
 
-class ExternalProcedure implements IExternalProcedureIntf
+final class ExternalProcedure implements IExternalProcedureIntf
 {
 	private IExternalProcedure wrapper;
 	private Routine routine;

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/FbException.java

@@ -24,7 +24,7 @@
 import com.sun.jna.Pointer;
 
 
-class FbException extends Exception
+final class FbException extends Exception
 {
 	private static final long serialVersionUID = 1L;
 

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/InternalContext.java

@@ -28,7 +28,7 @@
 import org.firebirdsql.fbjava.impl.FbClientLibrary.ITransaction;
 
 
-class InternalContext implements AutoCloseable
+final class InternalContext implements AutoCloseable
 {
 	private static ThreadLocal<InternalContext> tls = new ThreadLocal<InternalContext>() {
 		@Override

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/InternalDatabaseFactory.java

@@ -30,7 +30,7 @@
 import com.sun.jna.ptr.IntByReference;
 
 
-class InternalDatabaseFactory extends FbEmbeddedDatabaseFactory
+final class InternalDatabaseFactory extends FbEmbeddedDatabaseFactory
 {
 	private static final InternalDatabaseFactory INSTANCE = new InternalDatabaseFactory();
 

src/fbjava/src/main/java/org/firebirdsql/fbjava/impl/InternalFBConnection.java

@@ -31,7 +31,7 @@
 import com.sun.jna.ptr.IntByReference;
 
 
-public final class InternalFBConnection extends FBConnection
+public final class InternalFBConnection extends FBConnection	// must be public
 {
 	public InternalFBConnection(FBManagedConnection mc) throws SQLException
 	{