NIFI-2407 Implements EL support on some properties of processors/services

- Added EL support to "Directory" property of ListHDFS and GetHDFS processors
 - Added EL support to "Destination" property for ConsumeJMS and PublishJMS processors
 - Added EL support to "MQ ConnectionFactory Implementation", "MQ client library path", "Broker URI" properties for the JMS Connection Factory Provider
 - Added EL support to "Database Connection URL", "Database Driver Class Name", "DB Driver jar url", "DB username", and "DB password" properties for the DBCP Connection Pool
 - Removed NotificationServiceManagerSpec.groovy, previous PR from Joe Witt covers the needed testing for Variable Registry/Value Lookup at this time
This closes #778.

nifi-bootstrap/src/test/groovy/org/apache/nifi/bootstrap/NotificationServiceManagerSpec.groovy

@@ -1,50 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.nifi.bootstrap
-
-import org.apache.nifi.bootstrap.notification.NotificationType
-import org.apache.nifi.registry.VariableRegistry
-import spock.lang.Specification
-import java.nio.file.Paths
-
-class NotificationServiceManagerSpec extends Specification{
-
-    def setupSpec(){
-    }
-
-    def "should acess variable registry to replace EL values"(){
-
-        given:
-            def mockRegistry = Mock(VariableRegistry.class)
-            def notificationServiceManager = new NotificationServiceManager(mockRegistry);
-            def file = Paths.get("src/test/resources/notification-services.xml").toFile()
-            notificationServiceManager.loadNotificationServices(file)
-            //testing with stopped becasue it will block until method is completed
-            notificationServiceManager.registerNotificationService(NotificationType.NIFI_STOPPED,"custom-notification")
-
-        when:
-            notificationServiceManager.notify(NotificationType.NIFI_STOPPED,"NiFi Stopped","NiFi Stopped")
-
-        then:
-            6 * mockRegistry.getVariables() >> ["test.server":"smtp://fakeserver.com","test.username":"user","test.password":"pass"]
-
-
-    }
-
-
-}

nifi-nar-bundles/nifi-hadoop-bundle/nifi-hdfs-processors/src/main/java/org/apache/nifi/processors/hadoop/AbstractHadoopProcessor.java

@@ -191,9 +191,18 @@ public abstract class AbstractHadoopProcessor extends AbstractProcessor {
             HdfsResources resources = hdfsResources.get();
             if (resources.getConfiguration() == null) {
                 String configResources = context.getProperty(HADOOP_CONFIGURATION_RESOURCES).getValue();
-                String dir = context.getProperty(DIRECTORY_PROP_NAME).getValue();
+                final String dir;
-                dir = dir == null ? "/" : dir;
+                final PropertyDescriptor directoryPropDescriptor = getPropertyDescriptor(DIRECTORY_PROP_NAME);
-                resources = resetHDFSResources(configResources, dir, context);
+                if (directoryPropDescriptor != null) {
+                    if (directoryPropDescriptor.isExpressionLanguageSupported()) {
+                        dir = context.getProperty(DIRECTORY_PROP_NAME).evaluateAttributeExpressions().getValue();
+                    } else {
+                        dir = context.getProperty(DIRECTORY_PROP_NAME).getValue();
+                    }
+                } else {
+                    dir = null;
+                }
+                resources = resetHDFSResources(configResources, dir == null ? "/" : dir, context);
                 hdfsResources.set(resources);
             }
         } catch (IOException ex) {

nifi-nar-bundles/nifi-hadoop-bundle/nifi-hdfs-processors/src/main/java/org/apache/nifi/processors/hadoop/GetHDFS.java

@@ -97,6 +97,7 @@ public class GetHDFS extends AbstractHadoopProcessor {
     .description("The HDFS directory from which files should be read")
     .required(true)
     .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+    .expressionLanguageSupported(true)
     .build();
 
     public static final PropertyDescriptor RECURSE_SUBDIRS = new PropertyDescriptor.Builder()
@@ -241,7 +242,7 @@ public class GetHDFS extends AbstractHadoopProcessor {
         // copy configuration values to pass them around cleanly
         processorConfig = new ProcessorConfiguration(context);
         final FileSystem fs = getFileSystem();
-        final Path dir = new Path(context.getProperty(DIRECTORY).getValue());
+        final Path dir = new Path(context.getProperty(DIRECTORY).evaluateAttributeExpressions().getValue());
         if (!fs.exists(dir)) {
             throw new IOException("PropertyDescriptor " + DIRECTORY + " has invalid value " + dir + ". The directory does not exist.");
         }
@@ -341,7 +342,7 @@ public class GetHDFS extends AbstractHadoopProcessor {
         final Double bufferSizeProp = context.getProperty(BUFFER_SIZE).asDataSize(DataUnit.B);
         int bufferSize = bufferSizeProp != null ? bufferSizeProp.intValue() : conf.getInt(BUFFER_SIZE_KEY,
                 BUFFER_SIZE_DEFAULT);
-        final Path rootDir = new Path(context.getProperty(DIRECTORY).getValue());
+        final Path rootDir = new Path(context.getProperty(DIRECTORY).evaluateAttributeExpressions().getValue());
 
         final CompressionType compressionType = CompressionType.valueOf(context.getProperty(COMPRESSION_CODEC).toString());
         final boolean inferCompressionCodec = compressionType == CompressionType.AUTOMATIC;
@@ -501,7 +502,7 @@ public class GetHDFS extends AbstractHadoopProcessor {
         final private PathFilter pathFilter;
 
         ProcessorConfiguration(final ProcessContext context) {
-            configuredRootDirPath = new Path(context.getProperty(DIRECTORY).getValue());
+            configuredRootDirPath = new Path(context.getProperty(DIRECTORY).evaluateAttributeExpressions().getValue());
             ignoreDottedFiles = context.getProperty(IGNORE_DOTTED_FILES).asBoolean();
             final String fileFilterRegex = context.getProperty(FILE_FILTER_REGEX).getValue();
             fileFilterPattern = (fileFilterRegex == null) ? null : Pattern.compile(fileFilterRegex);

nifi-nar-bundles/nifi-hadoop-bundle/nifi-hdfs-processors/src/main/java/org/apache/nifi/processors/hadoop/ListHDFS.java

@@ -102,6 +102,7 @@ public class ListHDFS extends AbstractHadoopProcessor {
         .description("The HDFS directory from which files should be read")
         .required(true)
         .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+        .expressionLanguageSupported(true)
         .build();
 
     public static final PropertyDescriptor RECURSE_SUBDIRS = new PropertyDescriptor.Builder()
@@ -248,7 +249,7 @@ public class ListHDFS extends AbstractHadoopProcessor {
         }
         lastRunTimestamp = now;
 
-        final String directory = context.getProperty(DIRECTORY).getValue();
+        final String directory = context.getProperty(DIRECTORY).evaluateAttributeExpressions().getValue();
 
         // Ensure that we are using the latest listing information before we try to perform a listing of HDFS files.
         try {

nifi-nar-bundles/nifi-hadoop-bundle/nifi-hdfs-processors/src/test/java/org/apache/nifi/processors/hadoop/PutHDFSTest.java

@@ -199,7 +199,6 @@ public class PutHDFSTest {
         TestRunner runner = TestRunners.newTestRunner(proc);
         runner.setProperty(PutHDFS.DIRECTORY, "target/test-classes");
         runner.setProperty(PutHDFS.CONFLICT_RESOLUTION, "replace");
-        runner.setValidateExpressionUsage(false);
         try (FileInputStream fis = new FileInputStream("src/test/resources/testdata/randombytes-1");) {
             Map<String, String> attributes = new HashMap<String, String>();
             attributes.put(CoreAttributes.FILENAME.key(), "randombytes-1");
@@ -232,7 +231,6 @@ public class PutHDFSTest {
         runner.setProperty(PutHDFS.DIRECTORY, "target/test-classes");
         runner.setProperty(PutHDFS.CONFLICT_RESOLUTION, "replace");
         runner.setProperty(PutHDFS.COMPRESSION_CODEC, "GZIP");
-        runner.setValidateExpressionUsage(false);
         try (FileInputStream fis = new FileInputStream("src/test/resources/testdata/randombytes-1");) {
             Map<String, String> attributes = new HashMap<String, String>();
             attributes.put(CoreAttributes.FILENAME.key(), "randombytes-1");
@@ -281,7 +279,6 @@ public class PutHDFSTest {
         });
         runner.setProperty(PutHDFS.DIRECTORY, dirName);
         runner.setProperty(PutHDFS.CONFLICT_RESOLUTION, "replace");
-        runner.setValidateExpressionUsage(false);
 
         try (FileInputStream fis = new FileInputStream("src/test/resources/testdata/randombytes-1");) {
             Map<String, String> attributes = new HashMap<String, String>();

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-cf-service/src/main/java/org/apache/nifi/jms/cf/JMSConnectionFactoryProvider.java

@@ -117,11 +117,11 @@ public class JMSConnectionFactoryProvider extends AbstractControllerService impl
             if (!this.configured) {
                 if (logger.isInfoEnabled()) {
                     logger.info("Configuring " + this.getClass().getSimpleName() + " for '"
-                            + context.getProperty(CONNECTION_FACTORY_IMPL).getValue() + "' to be conected to '"
+                            + context.getProperty(CONNECTION_FACTORY_IMPL).evaluateAttributeExpressions().getValue() + "' to be conected to '"
                             + BROKER_URI + "'");
                 }
                 // will load user provided libraries/resources on the classpath
-                Utils.addResourcesToClasspath(context.getProperty(CLIENT_LIB_DIR_PATH).getValue());
+                Utils.addResourcesToClasspath(context.getProperty(CLIENT_LIB_DIR_PATH).evaluateAttributeExpressions().getValue());
 
                 this.createConnectionFactoryInstance(context);
 
@@ -177,7 +177,7 @@ public class JMSConnectionFactoryProvider extends AbstractControllerService impl
                 this.setProperty(propertyName, entry.getValue());
             } else {
                 if (propertyName.equals(BROKER)) {
-                    if (context.getProperty(CONNECTION_FACTORY_IMPL).getValue().startsWith("org.apache.activemq")) {
+                    if (context.getProperty(CONNECTION_FACTORY_IMPL).evaluateAttributeExpressions().getValue().startsWith("org.apache.activemq")) {
                         this.setProperty("brokerURL", entry.getValue());
                     } else {
                         String[] hostPort = entry.getValue().split(":");
@@ -248,7 +248,7 @@ public class JMSConnectionFactoryProvider extends AbstractControllerService impl
      * 'CONNECTION_FACTORY_IMPL'.
      */
     private void createConnectionFactoryInstance(ConfigurationContext context) {
-        String connectionFactoryImplName = context.getProperty(CONNECTION_FACTORY_IMPL).getValue();
+        String connectionFactoryImplName = context.getProperty(CONNECTION_FACTORY_IMPL).evaluateAttributeExpressions().getValue();
         this.connectionFactory = Utils.newDefaultInstance(connectionFactoryImplName);
     }
 

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-cf-service/src/main/java/org/apache/nifi/jms/cf/JMSConnectionFactoryProviderDefinition.java

@@ -44,6 +44,7 @@ public interface JMSConnectionFactoryProviderDefinition extends ControllerServic
                        + "class (i.e., org.apache.activemq.ActiveMQConnectionFactory)")
             .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
             .required(true)
+            .expressionLanguageSupported(true)
             .build();
     public static final PropertyDescriptor CLIENT_LIB_DIR_PATH = new PropertyDescriptor.Builder()
             .name(CF_LIB)
@@ -53,6 +54,7 @@ public interface JMSConnectionFactoryProviderDefinition extends ControllerServic
                        + "ConnectionFactory implementation.")
             .addValidator(new ClientLibValidator())
             .required(true)
+            .expressionLanguageSupported(true)
             .build();
 
     // ConnectionFactory specific properties
@@ -63,6 +65,7 @@ public interface JMSConnectionFactoryProviderDefinition extends ControllerServic
                       + "'tcp://myhost:61616' for ActiveMQ or 'myhost:1414' for IBM MQ")
             .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
             .required(true)
+            .expressionLanguageSupported(true)
             .build();
 
     public static final PropertyDescriptor SSL_CONTEXT_SERVICE = new PropertyDescriptor.Builder()

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-cf-service/src/test/java/org/apache/nifi/jms/cf/JMSConnectionFactoryProviderTest.java

@@ -16,14 +16,13 @@
  */
 package org.apache.nifi.jms.cf;
 
-import static org.junit.Assert.assertEquals;
+import org.apache.nifi.controller.ControllerService;
-import static org.junit.Assert.assertNotNull;
+import org.apache.nifi.processor.Processor;
-import static org.junit.Assert.assertTrue;
+import org.apache.nifi.util.TestRunner;
-
+import org.apache.nifi.util.TestRunners;
-import java.io.File;
+import org.junit.Test;
-import java.lang.reflect.Method;
+import org.slf4j.Logger;
-import java.util.Iterator;
+import org.slf4j.LoggerFactory;
-import java.util.ServiceLoader;
 
 import javax.jms.Connection;
 import javax.jms.ConnectionFactory;
@@ -32,15 +31,15 @@ import javax.jms.MessageConsumer;
 import javax.jms.MessageProducer;
 import javax.jms.Session;
 import javax.jms.TextMessage;
+import java.io.File;
+import java.lang.reflect.Method;
+import java.util.Iterator;
+import java.util.ServiceLoader;
 
-import org.apache.nifi.controller.ControllerService;
+import static org.junit.Assert.assertEquals;
-import org.apache.nifi.processor.Processor;
+import static org.junit.Assert.assertNotNull;
-import org.apache.nifi.util.TestRunner;
+import static org.junit.Assert.assertTrue;
-import org.apache.nifi.util.TestRunners;
+import static org.mockito.Mockito.mock;
-import org.junit.Test;
-import org.mockito.Mockito;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  *
@@ -51,7 +50,7 @@ public class JMSConnectionFactoryProviderTest {
 
     @Test
     public void validateFullConfigWithUserLib() throws Exception {
-        TestRunner runner = TestRunners.newTestRunner(Mockito.mock(Processor.class));
+        TestRunner runner = TestRunners.newTestRunner(mock(Processor.class));
         JMSConnectionFactoryProvider cfProvider = new JMSConnectionFactoryProvider();
         runner.addControllerService("cfProvider", cfProvider);
         runner.setProperty(cfProvider, JMSConnectionFactoryProvider.BROKER_URI, "myhost:1234");
@@ -76,7 +75,7 @@ public class JMSConnectionFactoryProviderTest {
 
     @Test(expected = AssertionError.class)
     public void validateOnConfigureFailsIfCNFonConnectionFactory() throws Exception {
-        TestRunner runner = TestRunners.newTestRunner(Mockito.mock(Processor.class));
+        TestRunner runner = TestRunners.newTestRunner(mock(Processor.class));
         JMSConnectionFactoryProvider cfProvider = new JMSConnectionFactoryProvider();
         runner.addControllerService("cfProvider", cfProvider);
         runner.setProperty(cfProvider, JMSConnectionFactoryProvider.BROKER_URI, "myhost:1234");
@@ -89,7 +88,7 @@ public class JMSConnectionFactoryProviderTest {
 
     @Test
     public void validateNotValidForNonExistingLibPath() throws Exception {
-        TestRunner runner = TestRunners.newTestRunner(Mockito.mock(Processor.class));
+        TestRunner runner = TestRunners.newTestRunner(mock(Processor.class));
         JMSConnectionFactoryProvider cfProvider = new JMSConnectionFactoryProvider();
         runner.addControllerService("cfProvider", cfProvider);
         runner.setProperty(cfProvider, JMSConnectionFactoryProvider.BROKER_URI, "myhost:1234");
@@ -102,7 +101,7 @@ public class JMSConnectionFactoryProviderTest {
 
     @Test(expected = AssertionError.class)
     public void validateFailsIfURINotHostPortAndNotActiveMQ() throws Exception {
-        TestRunner runner = TestRunners.newTestRunner(Mockito.mock(Processor.class));
+        TestRunner runner = TestRunners.newTestRunner(mock(Processor.class));
         JMSConnectionFactoryProvider cfProvider = new JMSConnectionFactoryProvider();
         runner.addControllerService("cfProvider", cfProvider);
         runner.setProperty(cfProvider, JMSConnectionFactoryProvider.BROKER_URI, "myhost");
@@ -116,7 +115,7 @@ public class JMSConnectionFactoryProviderTest {
 
     @Test
     public void validateNotValidForNonDirectoryPath() throws Exception {
-        TestRunner runner = TestRunners.newTestRunner(Mockito.mock(Processor.class));
+        TestRunner runner = TestRunners.newTestRunner(mock(Processor.class));
         JMSConnectionFactoryProvider cfProvider = new JMSConnectionFactoryProvider();
         runner.addControllerService("cfProvider", cfProvider);
         runner.setProperty(cfProvider, JMSConnectionFactoryProvider.BROKER_URI, "myhost:1234");
@@ -146,7 +145,7 @@ public class JMSConnectionFactoryProviderTest {
         try {
             String libPath = TestUtils.setupActiveMqLibForTesting(true);
 
-            TestRunner runner = TestRunners.newTestRunner(Mockito.mock(Processor.class));
+            TestRunner runner = TestRunners.newTestRunner(mock(Processor.class));
             JMSConnectionFactoryProvider cfProvider = new JMSConnectionFactoryProvider();
             runner.addControllerService("cfProvider", cfProvider);
             runner.setProperty(cfProvider, JMSConnectionFactoryProvider.BROKER_URI,

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-processors/src/main/java/org/apache/nifi/jms/processors/AbstractJMSProcessor.java

@@ -69,6 +69,7 @@ abstract class AbstractJMSProcessor<T extends JMSWorker> extends AbstractProcess
             .description("The name of the JMS Destination. Usually provided by the administrator (e.g., 'topic://myTopic').")
             .required(true)
             .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .expressionLanguageSupported(true)
             .build();
     static final PropertyDescriptor DESTINATION_TYPE = new PropertyDescriptor.Builder()
             .name("Destination Type")
@@ -198,7 +199,7 @@ abstract class AbstractJMSProcessor<T extends JMSWorker> extends AbstractProcess
 
             JmsTemplate jmsTemplate = new JmsTemplate();
             jmsTemplate.setConnectionFactory(this.cachingConnectionFactory);
-            jmsTemplate.setDefaultDestinationName(context.getProperty(DESTINATION).getValue());
+            jmsTemplate.setDefaultDestinationName(context.getProperty(DESTINATION).evaluateAttributeExpressions().getValue());
             jmsTemplate.setPubSubDomain(TOPIC.equals(context.getProperty(DESTINATION_TYPE).getValue()));
 
             // set of properties that may be good candidates for exposure via configuration

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-processors/src/main/java/org/apache/nifi/jms/processors/ConsumeJMS.java

@@ -87,7 +87,7 @@ public class ConsumeJMS extends AbstractJMSProcessor<JMSConsumer> {
             });
             Map<String, Object> jmsHeaders = response.getMessageHeaders();
             flowFile = this.updateFlowFileAttributesWithJmsHeaders(jmsHeaders, flowFile, processSession);
-            processSession.getProvenanceReporter().receive(flowFile, context.getProperty(DESTINATION).getValue());
+            processSession.getProvenanceReporter().receive(flowFile, context.getProperty(DESTINATION).evaluateAttributeExpressions().getValue());
             processSession.transfer(flowFile, REL_SUCCESS);
         } else {
             context.yield();

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-processors/src/main/java/org/apache/nifi/jms/processors/PublishJMS.java

@@ -101,7 +101,7 @@ public class PublishJMS extends AbstractJMSProcessor<JMSPublisher> {
                 this.targetResource.publish(this.extractMessageBody(flowFile, processSession),
                         flowFile.getAttributes());
                 processSession.transfer(flowFile, REL_SUCCESS);
-                processSession.getProvenanceReporter().send(flowFile, context.getProperty(DESTINATION).getValue());
+                processSession.getProvenanceReporter().send(flowFile, context.getProperty(DESTINATION).evaluateAttributeExpressions().getValue());
             } catch (Exception e) {
                 processSession.transfer(flowFile, REL_FAILURE);
                 this.getLogger().error("Failed while sending message to JMS via " + this.targetResource, e);

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-processors/src/test/java/org/apache/nifi/jms/processors/ConsumeJMSTest.java

@@ -16,11 +16,6 @@
  */
 package org.apache.nifi.jms.processors;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
-
 import org.apache.nifi.jms.cf.JMSConnectionFactoryProviderDefinition;
 import org.apache.nifi.logging.ComponentLog;
 import org.apache.nifi.util.MockFlowFile;
@@ -31,6 +26,11 @@ import org.springframework.jms.connection.CachingConnectionFactory;
 import org.springframework.jms.core.JmsTemplate;
 import org.springframework.jms.support.JmsHeaders;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
 public class ConsumeJMSTest {
 
     @Test

nifi-nar-bundles/nifi-jms-bundle/nifi-jms-processors/src/test/java/org/apache/nifi/jms/processors/PublishJMSTest.java

@@ -16,19 +16,6 @@
  */
 package org.apache.nifi.jms.processors;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
-
-import java.util.HashMap;
-import java.util.Map;
-
-import javax.jms.BytesMessage;
-import javax.jms.ConnectionFactory;
-import javax.jms.Queue;
-
 import org.apache.activemq.ActiveMQConnectionFactory;
 import org.apache.nifi.jms.cf.JMSConnectionFactoryProviderDefinition;
 import org.apache.nifi.util.MockFlowFile;
@@ -38,6 +25,18 @@ import org.junit.Test;
 import org.springframework.jms.core.JmsTemplate;
 import org.springframework.jms.support.JmsHeaders;
 
+import javax.jms.BytesMessage;
+import javax.jms.ConnectionFactory;
+import javax.jms.Queue;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
 public class PublishJMSTest {
 
     @Test

nifi-nar-bundles/nifi-standard-services/nifi-dbcp-service-bundle/nifi-dbcp-service/src/main/java/org/apache/nifi/dbcp/DBCPConnectionPool.java

@@ -16,18 +16,6 @@
  */
 package org.apache.nifi.dbcp;
 
-import java.net.MalformedURLException;
-import java.net.URL;
-import java.net.URLClassLoader;
-import java.sql.Connection;
-import java.sql.Driver;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import java.util.concurrent.TimeUnit;
-
 import org.apache.commons.dbcp.BasicDataSource;
 import org.apache.nifi.annotation.documentation.CapabilityDescription;
 import org.apache.nifi.annotation.documentation.Tags;
@@ -40,6 +28,18 @@ import org.apache.nifi.processor.exception.ProcessException;
 import org.apache.nifi.processor.util.StandardValidators;
 import org.apache.nifi.reporting.InitializationException;
 
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.sql.Connection;
+import java.sql.Driver;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
 /**
  * Implementation of for Database Connection Pooling Service. Apache DBCP is used for connection pooling functionality.
  *
@@ -55,6 +55,7 @@ public class DBCPConnectionPool extends AbstractControllerService implements DBC
         .defaultValue(null)
         .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
         .required(true)
+        .expressionLanguageSupported(true)
         .build();
 
     public static final PropertyDescriptor DB_DRIVERNAME = new PropertyDescriptor.Builder()
@@ -63,6 +64,7 @@ public class DBCPConnectionPool extends AbstractControllerService implements DBC
         .defaultValue(null)
         .required(true)
         .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+        .expressionLanguageSupported(true)
         .build();
 
     public static final PropertyDescriptor DB_DRIVER_JAR_URL = new PropertyDescriptor.Builder()
@@ -71,6 +73,7 @@ public class DBCPConnectionPool extends AbstractControllerService implements DBC
         .defaultValue(null)
         .required(false)
         .addValidator(StandardValidators.URL_VALIDATOR)
+        .expressionLanguageSupported(true)
         .build();
 
     public static final PropertyDescriptor DB_USER = new PropertyDescriptor.Builder()
@@ -78,6 +81,7 @@ public class DBCPConnectionPool extends AbstractControllerService implements DBC
         .description("Database user name")
         .defaultValue(null)
         .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+        .expressionLanguageSupported(true)
         .build();
 
     public static final PropertyDescriptor DB_PASSWORD = new PropertyDescriptor.Builder()
@@ -87,6 +91,7 @@ public class DBCPConnectionPool extends AbstractControllerService implements DBC
         .required(false)
         .sensitive(true)
         .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+        .expressionLanguageSupported(true)
         .build();
 
     public static final PropertyDescriptor MAX_WAIT_TIME = new PropertyDescriptor.Builder()
@@ -148,9 +153,9 @@ public class DBCPConnectionPool extends AbstractControllerService implements DBC
     @OnEnabled
     public void onConfigured(final ConfigurationContext context) throws InitializationException {
 
-        final String drv = context.getProperty(DB_DRIVERNAME).getValue();
+        final String drv = context.getProperty(DB_DRIVERNAME).evaluateAttributeExpressions().getValue();
-        final String user = context.getProperty(DB_USER).getValue();
+        final String user = context.getProperty(DB_USER).evaluateAttributeExpressions().getValue();
-        final String passw = context.getProperty(DB_PASSWORD).getValue();
+        final String passw = context.getProperty(DB_PASSWORD).evaluateAttributeExpressions().getValue();
         final Long maxWaitMillis = context.getProperty(MAX_WAIT_TIME).asTimePeriod(TimeUnit.MILLISECONDS);
         final Integer maxTotal = context.getProperty(MAX_TOTAL_CONNECTIONS).asInteger();
 
@@ -158,10 +163,10 @@ public class DBCPConnectionPool extends AbstractControllerService implements DBC
         dataSource.setDriverClassName(drv);
 
         // Optional driver URL, when exist, this URL will be used to locate driver jar file location
-        final String urlString = context.getProperty(DB_DRIVER_JAR_URL).getValue();
+        final String urlString = context.getProperty(DB_DRIVER_JAR_URL).evaluateAttributeExpressions().getValue();
         dataSource.setDriverClassLoader(getDriverClassLoader(urlString, drv));
 
-        final String dburl = context.getProperty(DATABASE_URL).getValue();
+        final String dburl = context.getProperty(DATABASE_URL).evaluateAttributeExpressions().getValue();
 
         dataSource.setMaxWait(maxWaitMillis);
         dataSource.setMaxActive(maxTotal);

nifi-nar-bundles/nifi-standard-services/nifi-dbcp-service-bundle/nifi-dbcp-service/src/test/java/org/apache/nifi/dbcp/DBCPServiceTest.java

@@ -16,8 +16,16 @@
  */
 package org.apache.nifi.dbcp;
 
-import static org.junit.Assert.assertEquals;
+import org.apache.nifi.processor.exception.ProcessException;
-import static org.junit.Assert.assertNotNull;
+import org.apache.nifi.reporting.InitializationException;
+import org.apache.nifi.util.TestRunner;
+import org.apache.nifi.util.TestRunners;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Ignore;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
 
 import java.io.File;
 import java.net.MalformedURLException;
@@ -32,16 +40,8 @@ import java.sql.Statement;
 import java.util.HashMap;
 import java.util.Map;
 
-import org.apache.nifi.processor.exception.ProcessException;
+import static org.junit.Assert.assertEquals;
-import org.apache.nifi.reporting.InitializationException;
+import static org.junit.Assert.assertNotNull;
-import org.apache.nifi.util.TestRunner;
-import org.apache.nifi.util.TestRunners;
-import org.junit.Assert;
-import org.junit.BeforeClass;
-import org.junit.Ignore;
-import org.junit.Rule;
-import org.junit.Test;
-import org.junit.rules.ExpectedException;
 
 public class DBCPServiceTest {