NIFI-8630 Upgraded javax.mail 1.4.7 to jakarta.mail 2.0.1 for PutEmail

- Added jakarata.activation 2.0.1 to support jakarta.mail 2.0.1
- Clarified description of SMTP TLS property enabling STARTTLS

NIFI-8630 Added final to several variables and adjusted variable declaration

Signed-off-by: Pierre Villard <pierre.villard.fr@gmail.com>

This closes #5179.
diff --git a/nifi-assembly/LICENSE b/nifi-assembly/LICENSE
index 624948a..7336f34 100644
--- a/nifi-assembly/LICENSE
+++ b/nifi-assembly/LICENSE
@@ -2645,7 +2645,7 @@
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   SOFTWARE.
 
-The binary distribution of this product bundles 'JUnit Platform' and 'JUnit Jupiter' modules under an EPL v2 license
+The binary distribution of this product bundles 'JUnit Platform', 'JUnit Jupiter', 'Jakarta Mail', and 'Jakarta Mail API' modules under an EPL v2 license
 
   Eclipse Public License - v 2.0
 
@@ -3030,7 +3030,7 @@
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     SOFTWARE
 
-The binary distribution of this product bundles 'Jakarta Activation API 1.2.1' and 'Jakarta XML Binding API 2.3.2' modules under an EDL v1.0 license
+The binary distribution of this product bundles 'Jakarta Activation', 'Jakarta Activation API' and 'Jakarta XML Binding API 2.3.2' modules under an EDL v1.0 license
 
     Copyright (c) 2007, Eclipse Foundation, Inc. and its licensors.
 
diff --git a/nifi-assembly/NOTICE b/nifi-assembly/NOTICE
index 7c35cd5..cce8766 100644
--- a/nifi-assembly/NOTICE
+++ b/nifi-assembly/NOTICE
@@ -2068,12 +2068,22 @@
     (EPLv1.0) Clojure (org.clojure:clojure:1.8.0 - http://clojure.org)
 
 ************************
+Eclipse Public License 2.0
+************************
+
+The following binary components are provided under the Eclipse Public License 2.0.
+
+    (EPL 2.0) Jakarta Mail API (jakarta.mail:jakarta.mail-api:jar:2.0.1)
+    (EPL 2.0) Jakarta Mail (com.sun.mail:jakarta.mail:jar:2.0.1)
+
+************************
 Eclipse Distribution License 1.0
 ************************
 
 The following binary components are provided under the Eclipse Distribution License 1.0.
 
-    (EDL 1.0) Jakarta Activation API (jakarta.activation:jakarta.activation-api:jar:1.2.1)
+    (EDL 1.0) Jakarta Activation API (jakarta.activation:jakarta.activation-api:jar:2.0.1)
+    (EDL 1.0) Jakarta Activation (com.sun.activation:jakarta.activation:jar:2.0.1)
     (EDL 1.0) Jakarta XML Binding API (jakarta.xml.bind:jakarta.xml.bind-api:jar:2.3.2)
 
 *****************
diff --git a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-nar/src/main/resources/META-INF/LICENSE b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-nar/src/main/resources/META-INF/LICENSE
index 7fd9a34..b17cf20 100644
--- a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-nar/src/main/resources/META-INF/LICENSE
+++ b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-nar/src/main/resources/META-INF/LICENSE
@@ -378,3 +378,319 @@
     OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
     WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+This product bundles 'Jakarta Activation' 'Jakarta Activation API' under the Eclipse Distribution License 1.0.
+
+    Copyright (c) 2007, Eclipse Foundation, Inc. and its licensors.
+
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, are permitted provided that the following
+    conditions are met:
+
+    - Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    - Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    - Neither the name of the Eclipse Foundation, Inc. nor the
+      names of its contributors may be used to endorse or promote
+      products derived from this software without specific prior
+      written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+    ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+This product bundles 'Jakarta Mail' and 'Jakarta Mail API' under an Eclipse Public License 2.0.
+
+    Eclipse Public License - v 2.0
+
+        THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE
+        PUBLIC LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION
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+
+    1. DEFINITIONS
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+    "Contribution" means:
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+      such Contributor itself or anyone acting on such Contributor's behalf.
+      Contributions do not include changes or additions to the Program that
+      are not Modified Works.
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+    "Contributor" means any person or entity that Distributes the Program.
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+    "Program" means the Contributions Distributed in accordance with this
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+    exceptions or additional permissions as identified by the initial
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+    2. GRANT OF RIGHTS
+
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+
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+
+      a) the Program must also be made available as Source Code, in
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+         warranties and conditions, express and implied, including
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+
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+    3.2 When the Program is Distributed as Source Code:
+
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+      Program (i) is combined with other material in a separate file or
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+      Exhibit A of this Agreement, then the Program may be made available
+      under the terms of such Secondary Licenses, and
+
+      b) a copy of this Agreement must be included with each copy of
+      the Program.
+
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+    of liability ("notices") contained within the Program from any copy of
+    the Program which they Distribute, provided that Contributors may add
+    their own appropriate notices.
+
+    4. COMMERCIAL DISTRIBUTION
+
+    Commercial distributors of software may accept certain responsibilities
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+    license is intended to facilitate the commercial use of the Program,
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+    offering should do so in a manner which does not create potential
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+    apply to any claims or Losses relating to any actual or alleged
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+    For example, a Contributor might include the Program in a commercial
+    product offering, Product X. That Contributor is then a Commercial
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+    claims and warranties, and if a court requires any other Contributor to
+    pay any damages as a result, the Commercial Contributor must pay
+    those damages.
+
+    5. NO WARRANTY
+
+    EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, AND TO THE EXTENT
+    PERMITTED BY APPLICABLE LAW, THE PROGRAM IS PROVIDED ON AN "AS IS"
+    BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR
+    IMPLIED INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR CONDITIONS OF
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+    PURPOSE. Each Recipient is solely responsible for determining the
+    appropriateness of using and distributing the Program and assumes all
+    risks associated with its exercise of rights under this Agreement,
+    including but not limited to the risks and costs of program errors,
+    compliance with applicable laws, damage to or loss of data, programs
+    or equipment, and unavailability or interruption of operations.
+
+    6. DISCLAIMER OF LIABILITY
+
+    EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, AND TO THE EXTENT
+    PERMITTED BY APPLICABLE LAW, NEITHER RECIPIENT NOR ANY CONTRIBUTORS
+    SHALL HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING WITHOUT LIMITATION LOST
+    PROFITS), HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE PROGRAM OR THE
+    EXERCISE OF ANY RIGHTS GRANTED HEREUNDER, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGES.
+
+    7. GENERAL
+
+    If any provision of this Agreement is invalid or unenforceable under
+    applicable law, it shall not affect the validity or enforceability of
+    the remainder of the terms of this Agreement, and without further
+    action by the parties hereto, such provision shall be reformed to the
+    minimum extent necessary to make such provision valid and enforceable.
+
+    If Recipient institutes patent litigation against any entity
+    (including a cross-claim or counterclaim in a lawsuit) alleging that the
+    Program itself (excluding combinations of the Program with other software
+    or hardware) infringes such Recipient's patent(s), then such Recipient's
+    rights granted under Section 2(b) shall terminate as of the date such
+    litigation is filed.
+
+    All Recipient's rights under this Agreement shall terminate if it
+    fails to comply with any of the material terms or conditions of this
+    Agreement and does not cure such failure in a reasonable period of
+    time after becoming aware of such noncompliance. If all Recipient's
+    rights under this Agreement terminate, Recipient agrees to cease use
+    and distribution of the Program as soon as reasonably practicable.
+    However, Recipient's obligations under this Agreement and any licenses
+    granted by Recipient relating to the Program shall continue and survive.
+
+    Everyone is permitted to copy and distribute copies of this Agreement,
+    but in order to avoid inconsistency the Agreement is copyrighted and
+    may only be modified in the following manner. The Agreement Steward
+    reserves the right to publish new versions (including revisions) of
+    this Agreement from time to time. No one other than the Agreement
+    Steward has the right to modify this Agreement. The Eclipse Foundation
+    is the initial Agreement Steward. The Eclipse Foundation may assign the
+    responsibility to serve as the Agreement Steward to a suitable separate
+    entity. Each new version of the Agreement will be given a distinguishing
+    version number. The Program (including Contributions) may always be
+    Distributed subject to the version of the Agreement under which it was
+    received. In addition, after a new version of the Agreement is published,
+    Contributor may elect to Distribute the Program (including its
+    Contributions) under the new version.
+
+    Except as expressly stated in Sections 2(a) and 2(b) above, Recipient
+    receives no rights or licenses to the intellectual property of any
+    Contributor under this Agreement, whether expressly, by implication,
+    estoppel or otherwise. All rights in the Program not expressly granted
+    under this Agreement are reserved. Nothing in this Agreement is intended
+    to be enforceable by any entity that is not a Contributor or Recipient.
+    No third-party beneficiary rights are created under this Agreement.
+
+    Exhibit A - Form of Secondary Licenses Notice
+
+    "This Source Code may also be made available under the following
+    Secondary Licenses when the conditions for such availability set forth
+    in the Eclipse Public License, v. 2.0 are satisfied: {name license(s),
+    version(s), and exceptions or additional permissions here}."
+
+      Simply including a copy of this Agreement, including this Exhibit A
+      is not sufficient to license the Source Code under Secondary Licenses.
+
+      If it is not possible or desirable to put the notice in a particular
+      file, then You may include the notice in a location (such as a LICENSE
+      file in a relevant directory) where a recipient would be likely to
+      look for such a notice.
+
+      You may add additional accurate notices of copyright ownership.
diff --git a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-nar/src/main/resources/META-INF/NOTICE b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-nar/src/main/resources/META-INF/NOTICE
index 48fc21a..bd1941f 100644
--- a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-nar/src/main/resources/META-INF/NOTICE
+++ b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-nar/src/main/resources/META-INF/NOTICE
@@ -262,20 +262,11 @@
     (CDDL 1.1) (GPL2 w/ CPE) jersey-core (com.sun.jersey:jersey-core:jar:1.19 - https://jersey.java.net/jersey-core/)
     (CDDL 1.1) (GPL2 w/ CPE) jersey-client (com.sun.jersey:jersey-client:jar:1.19 - https://jersey.java.net/jersey-client/)
     (CDDL 1.1) (GPL2 w/ CPE) jersey-server (com.sun.jersey:jersey-server:jar:1.19 - https://jersey.java.net/jersey-server/)
-    (CDDL 1.1) (GPL2 w/ CPE) JavaMail API (compat) (javax.mail:mail:jar:1.4.7 - http://kenai.com/projects/javamail/mail)
     (CDDL 1.1) (GPL2 w/ CPE) Javax JMS Api (javax.jms:javax.jms-api:jar:2.0.1 - http://java.net/projects/jms-spec/pages/Home)
     (CDDL 1.1) (GPL2 w/ CPE) Expression Language 3.0 API (javax.el:javax.el-api:jar:3.0.0 - http://uel-spec.java.net)
     (CDDL 1.1) (GPL2 w/ CPE) javax.ws.rs-api (javax.ws.rs:javax.ws.rs-api:jar:2.1 - http://jax-rs-spec.java.net)
 
 *****************
-Common Development and Distribution License v1.0:
-*****************
-
-The following binary components are provided under the Common Development and Distribution License v1.0.  See project link for details.
-
-    (CDDL 1.0) JavaBeans Activation Framework (JAF) (javax.activation:activation:jar:1.1 - http://java.sun.com/products/javabeans/jaf/index.jsp)
-
-*****************
 Mozilla Public License v2.0
 *****************
 
@@ -291,5 +282,20 @@
 
     (Public Domain) XZ for Java (org.tukaani:xz:jar:1.5 - http://tukaani.org/xz/java.html
 
+************************
+Eclipse Distribution License 1.0
+************************
 
+The following binary components are provided under the Eclipse Distribution License 1.0.
 
+    (EDL 1.0) Jakarta Activation API (jakarta.activation:jakarta.activation-api:jar:2.0.1)
+    (EDL 1.0) Jakarta Activation (com.sun.activation:jakarta.activation:jar:2.0.1)
+
+************************
+Eclipse Public License 2.0
+************************
+
+The following binary components are provided under the Eclipse Public License 2.0.
+
+    (EPL 2.0) Jakarta Mail API (jakarta.mail:jakarta.mail-api:jar:2.0.1)
+    (EPL 2.0) Jakarta Mail (com.sun.mail:jakarta.mail:jar:2.0.1)
diff --git a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/pom.xml b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/pom.xml
index 0a61d61..649c44b 100644
--- a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/pom.xml
+++ b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/pom.xml
@@ -158,8 +158,20 @@
             <artifactId>httpcore</artifactId>
         </dependency>
         <dependency>
-            <groupId>javax.mail</groupId>
-            <artifactId>mail</artifactId>
+            <groupId>jakarta.activation</groupId>
+            <artifactId>jakarta.activation-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.sun.activation</groupId>
+            <artifactId>jakarta.activation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.mail</groupId>
+            <artifactId>jakarta.mail-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.sun.mail</groupId>
+            <artifactId>jakarta.mail</artifactId>
         </dependency>
         <dependency>
             <groupId>com.github.jponge</groupId>
diff --git a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/PutEmail.java b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/PutEmail.java
index a8c54f1..f03da5b 100644
--- a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/PutEmail.java
+++ b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/PutEmail.java
@@ -17,9 +17,9 @@
 package org.apache.nifi.processors.standard;
 
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -33,22 +33,22 @@
 import java.util.Set;
 import java.util.regex.Pattern;
 
-import javax.activation.DataHandler;
-import javax.mail.Authenticator;
-import javax.mail.Message;
-import javax.mail.Message.RecipientType;
-import javax.mail.MessagingException;
-import javax.mail.PasswordAuthentication;
-import javax.mail.Session;
-import javax.mail.Transport;
-import javax.mail.internet.AddressException;
-import javax.mail.internet.InternetAddress;
-import javax.mail.internet.MimeBodyPart;
-import javax.mail.internet.MimeMessage;
-import javax.mail.internet.MimeMultipart;
-import javax.mail.internet.MimeUtility;
-import javax.mail.internet.PreencodedMimeBodyPart;
-import javax.mail.util.ByteArrayDataSource;
+import jakarta.activation.DataHandler;
+import jakarta.mail.Authenticator;
+import jakarta.mail.Message;
+import jakarta.mail.Message.RecipientType;
+import jakarta.mail.MessagingException;
+import jakarta.mail.PasswordAuthentication;
+import jakarta.mail.Session;
+import jakarta.mail.Transport;
+import jakarta.mail.internet.AddressException;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeBodyPart;
+import jakarta.mail.internet.MimeMessage;
+import jakarta.mail.internet.MimeMultipart;
+import jakarta.mail.internet.MimeUtility;
+import jakarta.mail.internet.PreencodedMimeBodyPart;
+import jakarta.mail.util.ByteArrayDataSource;
 
 import org.apache.commons.codec.binary.Base64;
 import org.apache.nifi.annotation.behavior.InputRequirement;
@@ -72,7 +72,6 @@
 import org.apache.nifi.processor.ProcessorInitializationContext;
 import org.apache.nifi.processor.Relationship;
 import org.apache.nifi.processor.exception.ProcessException;
-import org.apache.nifi.processor.io.InputStreamCallback;
 import org.apache.nifi.processor.util.StandardValidators;
 import org.apache.nifi.stream.io.StreamUtils;
 
@@ -124,7 +123,8 @@
             .build();
     public static final PropertyDescriptor SMTP_TLS = new PropertyDescriptor.Builder()
             .name("SMTP TLS")
-            .description("Flag indicating whether TLS should be enabled")
+            .displayName("SMTP STARTTLS")
+            .description("Flag indicating whether Opportunistic TLS should be enabled using STARTTLS command")
             .required(true)
             .expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
             .addValidator(StandardValidators.BOOLEAN_VALIDATOR)
@@ -243,7 +243,10 @@
             .description("FlowFiles that fail to send will be routed to this relationship")
             .build();
 
+    private static final Charset CONTENT_CHARSET = StandardCharsets.UTF_8;
+
     private List<PropertyDescriptor> properties;
+
     private Set<Relationship> relationships;
 
     /**
@@ -329,7 +332,7 @@
         try {
             message.setHeader(header, MimeUtility.encodeText(value));
         } catch (UnsupportedEncodingException e){
-            logger.warn("Unable to add header {} with value {} due to encoding exception", new Object[]{header, value});
+            logger.warn("Unable to add header {} with value {} due to encoding exception", header, value);
         }
     }
 
@@ -341,11 +344,8 @@
         }
 
         final Properties properties = this.getMailPropertiesFromFlowFile(context, flowFile);
-
         final Session mailSession = this.createMailSession(properties);
-
         final Message message = new MimeMessage(mailSession);
-        final ComponentLog logger = getLogger();
 
         try {
             message.addFrom(toInetAddresses(context, flowFile, FROM));
@@ -363,30 +363,27 @@
             this.setMessageHeader("X-Mailer", context.getProperty(HEADER_XMAILER).evaluateAttributeExpressions(flowFile).getValue(), message);
             message.setSubject(context.getProperty(SUBJECT).evaluateAttributeExpressions(flowFile).getValue());
 
-            String messageText = getMessage(flowFile, context, session);
+            final String messageText = getMessage(flowFile, context, session);
 
-            String contentType = context.getProperty(CONTENT_TYPE).evaluateAttributeExpressions(flowFile).getValue();
+            final String contentType = context.getProperty(CONTENT_TYPE).evaluateAttributeExpressions(flowFile).getValue();
             message.setContent(messageText, contentType);
             message.setSentDate(new Date());
 
             if (context.getProperty(ATTACH_FILE).asBoolean()) {
                 final MimeBodyPart mimeText = new PreencodedMimeBodyPart("base64");
                 mimeText.setDataHandler(new DataHandler(new ByteArrayDataSource(
-                        Base64.encodeBase64(messageText.getBytes("UTF-8")), contentType + "; charset=\"utf-8\"")));
+                        Base64.encodeBase64(messageText.getBytes(CONTENT_CHARSET)), contentType + "; charset=\"utf-8\"")));
                 final MimeBodyPart mimeFile = new MimeBodyPart();
-                session.read(flowFile, new InputStreamCallback() {
-                    @Override
-                    public void process(final InputStream stream) throws IOException {
-                        try {
-                            mimeFile.setDataHandler(new DataHandler(new ByteArrayDataSource(stream, "application/octet-stream")));
-                        } catch (final Exception e) {
-                            throw new IOException(e);
-                        }
+                session.read(flowFile, stream -> {
+                    try {
+                        mimeFile.setDataHandler(new DataHandler(new ByteArrayDataSource(stream, "application/octet-stream")));
+                    } catch (final Exception e) {
+                        throw new IOException(e);
                     }
                 });
 
                 mimeFile.setFileName(MimeUtility.encodeText(flowFile.getAttribute(CoreAttributes.FILENAME.key())));
-                MimeMultipart multipart = new MimeMultipart();
+                final MimeMultipart multipart = new MimeMultipart();
                 multipart.addBodyPart(mimeText);
                 multipart.addBodyPart(mimeFile);
                 message.setContent(multipart);
@@ -396,10 +393,10 @@
 
             session.getProvenanceReporter().send(flowFile, "mailto:" + message.getAllRecipients()[0].toString());
             session.transfer(flowFile, REL_SUCCESS);
-            logger.info("Sent email as a result of receiving {}", new Object[]{flowFile});
+            getLogger().debug("Sent email as a result of receiving {}", flowFile);
         } catch (final ProcessException | MessagingException | IOException e) {
             context.yield();
-            logger.error("Failed to send email for {}: {}; routing to failure", new Object[]{flowFile, e.getMessage()}, e);
+            getLogger().error("Failed to send email for {}: {}; routing to failure", flowFile, e.getMessage(), e);
             session.transfer(flowFile, REL_FAILURE);
         }
     }
@@ -410,14 +407,9 @@
         if(context.getProperty(CONTENT_AS_MESSAGE).evaluateAttributeExpressions(flowFile).asBoolean()) {
             // reading all the content of the input flow file
             final byte[] byteBuffer = new byte[(int) flowFile.getSize()];
-            session.read(flowFile, new InputStreamCallback() {
-                @Override
-                public void process(InputStream in) throws IOException {
-                    StreamUtils.fillBuffer(in, byteBuffer, false);
-                }
-            });
+            session.read(flowFile, in -> StreamUtils.fillBuffer(in, byteBuffer, false));
 
-            messageText = new String(byteBuffer, 0, byteBuffer.length, Charset.forName("UTF-8"));
+            messageText = new String(byteBuffer, 0, byteBuffer.length, CONTENT_CHARSET);
         } else if (context.getProperty(MESSAGE).isSet()) {
             messageText = context.getProperty(MESSAGE).evaluateAttributeExpressions(flowFile).getValue();
         }
@@ -436,20 +428,19 @@
      * @return session
      */
     private Session createMailSession(final Properties properties) {
-        String authValue = properties.getProperty("mail.smtp.auth");
-        Boolean auth = Boolean.valueOf(authValue);
+        final boolean auth = Boolean.parseBoolean(properties.getProperty("mail.smtp.auth"));
 
         /*
          * Conditionally create a password authenticator if the 'auth' parameter is set.
          */
-        final Session mailSession = auth ? Session.getInstance(properties, new Authenticator() {
+        return auth ? Session.getInstance(properties, new Authenticator() {
             @Override
             public PasswordAuthentication getPasswordAuthentication() {
-                String username = properties.getProperty("mail.smtp.user"), password = properties.getProperty("mail.smtp.password");
+                final String username = properties.getProperty("mail.smtp.user");
+                final String password = properties.getProperty("mail.smtp.password");
                 return new PasswordAuthentication(username, password);
             }
         }) : Session.getInstance(properties); // without auth
-        return mailSession;
     }
 
     /**
@@ -460,25 +451,17 @@
      * @return mail properties
      */
     private Properties getMailPropertiesFromFlowFile(final ProcessContext context, final FlowFile flowFile) {
-
         final Properties properties = new Properties();
 
-        final ComponentLog logger = this.getLogger();
-
-        for (Entry<String, PropertyDescriptor> entry : propertyToContext.entrySet()) {
-
+        for (final Entry<String, PropertyDescriptor> entry : propertyToContext.entrySet()) {
             // Evaluate the property descriptor against the flow file
-            String flowFileValue = context.getProperty(entry.getValue()).evaluateAttributeExpressions(flowFile).getValue();
-
-            String property = entry.getKey();
-
-            logger.debug("Evaluated Mail Property: {} with Value: {}", new Object[]{property, flowFileValue});
+            final String flowFileValue = context.getProperty(entry.getValue()).evaluateAttributeExpressions(flowFile).getValue();
+            final String property = entry.getKey();
 
             // Nullable values are not allowed, so filter out
             if (null != flowFileValue) {
                 properties.setProperty(property, flowFileValue);
             }
-
         }
 
         return properties;
@@ -488,14 +471,14 @@
     public static final String BODY_SEPARATOR = "\n\n--------------------------------------------------\n";
 
     private static String formatAttributes(final FlowFile flowFile, final String messagePrepend) {
-        StringBuilder message = new StringBuilder(messagePrepend);
+        final StringBuilder message = new StringBuilder(messagePrepend);
         message.append(BODY_SEPARATOR);
         message.append("\nStandard FlowFile Metadata:");
         message.append(String.format("\n\t%1$s = '%2$s'", "id", flowFile.getAttribute(CoreAttributes.UUID.key())));
         message.append(String.format("\n\t%1$s = '%2$s'", "entryDate", new Date(flowFile.getEntryDate())));
         message.append(String.format("\n\t%1$s = '%2$s'", "fileSize", flowFile.getSize()));
         message.append("\nFlowFile Attributes:");
-        for (Entry<String, String> attribute : flowFile.getAttributes().entrySet()) {
+        for (final Entry<String, String> attribute : flowFile.getAttributes().entrySet()) {
             message.append(String.format("\n\t%1$s = '%2$s'", attribute.getKey(), attribute.getValue()));
         }
         message.append("\n");
@@ -512,7 +495,7 @@
     private InternetAddress[] toInetAddresses(final ProcessContext context, final FlowFile flowFile,
             PropertyDescriptor propertyDescriptor) throws AddressException {
         InternetAddress[] parse;
-        String value = context.getProperty(propertyDescriptor).evaluateAttributeExpressions(flowFile).getValue();
+        final String value = context.getProperty(propertyDescriptor).evaluateAttributeExpressions(flowFile).getValue();
         if (value == null || value.isEmpty()){
             if (propertyDescriptor.isRequired()) {
                 final String exceptionMsg = "Required property '" + propertyDescriptor.getDisplayName() + "' evaluates to an empty string.";
@@ -540,5 +523,4 @@
     protected void send(final Message msg) throws MessagingException {
         Transport.send(msg);
     }
-
 }
diff --git a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestPutEmail.java b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestPutEmail.java
index 659912f..311869f 100644
--- a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestPutEmail.java
+++ b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestPutEmail.java
@@ -21,17 +21,18 @@
 import static org.junit.Assert.assertTrue;
 
 import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import javax.mail.BodyPart;
-import javax.mail.Message;
-import javax.mail.MessagingException;
-import javax.mail.internet.MimeMessage.RecipientType;
-import javax.mail.internet.MimeMultipart;
-import javax.mail.internet.MimeUtility;
+import jakarta.mail.BodyPart;
+import jakarta.mail.Message;
+import jakarta.mail.MessagingException;
+import jakarta.mail.internet.MimeMessage.RecipientType;
+import jakarta.mail.internet.MimeMultipart;
+import jakarta.mail.internet.MimeUtility;
 
 import org.apache.commons.codec.binary.Base64;
 import org.apache.commons.codec.binary.StringUtils;
@@ -59,7 +60,7 @@
      */
     private static final class PutEmailExtension extends PutEmail {
         private MessagingException e;
-        private ArrayList<Message> messages = new ArrayList<>();
+        private final ArrayList<Message> messages = new ArrayList<>();
 
         @Override
         protected void send(Message msg) throws MessagingException {
@@ -178,7 +179,7 @@
     }
 
     @Test
-    public void testInvalidAddress() throws Exception {
+    public void testInvalidAddress() {
         // verifies that unparsable addresses lead to the flow file being routed to failure
         runner.setProperty(PutEmail.SMTP_HOSTNAME, "smtp-host");
         runner.setProperty(PutEmail.HEADER_XMAILER, "TestingNiFi");
@@ -197,7 +198,7 @@
     }
 
     @Test
-    public void testEmptyFrom() throws Exception {
+    public void testEmptyFrom() {
         // verifies that if the FROM property evaluates to an empty string at
         // runtime the flow file is transferred to failure.
         runner.setProperty(PutEmail.SMTP_HOSTNAME, "smtp-host");
@@ -250,12 +251,12 @@
         final MimeMultipart multipart = (MimeMultipart) message.getContent();
         final BodyPart part = multipart.getBodyPart(0);
         final InputStream is = part.getDataHandler().getInputStream();
-        final String decodedText = StringUtils.newStringUtf8(Base64.decodeBase64(IOUtils.toString(is, "UTF-8")));
+        final String decodedText = StringUtils.newStringUtf8(Base64.decodeBase64(IOUtils.toString(is, StandardCharsets.UTF_8)));
         assertEquals("Message Body", decodedText);
 
         final BodyPart attachPart = multipart.getBodyPart(1);
         final InputStream attachIs = attachPart.getDataHandler().getInputStream();
-        final String text = IOUtils.toString(attachIs, "UTF-8");
+        final String text = IOUtils.toString(attachIs, StandardCharsets.UTF_8);
         assertEquals("test한的ほу́.pdf", MimeUtility.decodeText(attachPart.getFileName()));
         assertEquals("Some text", text);
 
@@ -275,7 +276,7 @@
         runner.setProperty(PutEmail.BCC, "recipientbcc@apache.org,anotherbcc@apache.org");
         runner.setProperty(PutEmail.CONTENT_AS_MESSAGE, "${sendContent}");
 
-        Map<String, String> attributes = new HashMap<String, String>();
+        Map<String, String> attributes = new HashMap<>();
         attributes.put("sendContent", "true");
         attributes.put("body", "Message Body");
 
diff --git a/nifi-nar-bundles/nifi-standard-bundle/pom.xml b/nifi-nar-bundles/nifi-standard-bundle/pom.xml
index 46d7a2e..21a208d 100644
--- a/nifi-nar-bundles/nifi-standard-bundle/pom.xml
+++ b/nifi-nar-bundles/nifi-standard-bundle/pom.xml
@@ -201,9 +201,24 @@
                 <version>4.4.9</version>
             </dependency>
             <dependency>
-                <groupId>javax.mail</groupId>
-                <artifactId>mail</artifactId>
-                <version>1.4.7</version>
+                <groupId>jakarta.activation</groupId>
+                <artifactId>jakarta.activation-api</artifactId>
+                <version>2.0.1</version>
+            </dependency>
+            <dependency>
+                <groupId>com.sun.activation</groupId>
+                <artifactId>jakarta.activation</artifactId>
+                <version>2.0.1</version>
+            </dependency>
+            <dependency>
+                <groupId>jakarta.mail</groupId>
+                <artifactId>jakarta.mail-api</artifactId>
+                <version>2.0.1</version>
+            </dependency>
+            <dependency>
+                <groupId>com.sun.mail</groupId>
+                <artifactId>jakarta.mail</artifactId>
+                <version>2.0.1</version>
             </dependency>
             <dependency>
                 <groupId>com.github.jponge</groupId>