First Commit

.gitignore

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+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/codeStyles/Project.xml

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+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <JetCodeStyleSettings>
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </JetCodeStyleSettings>
+    <codeStyleSettings language="kotlin">
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </codeStyleSettings>
+  </code_scheme>
+</component>

.idea/codeStyles/codeStyleConfig.xml

@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+  </state>
+</component>

.idea/gradle.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="ReplaceUntilWithRangeUntil" enabled="true" level="WEAK WARNING" enabled_by_default="true" />
+  </profile>
+</component>

.idea/kotlinc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="KotlinJpsPluginSettings">
+    <option name="version" value="1.8.21" />
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="FrameworkDetectionExcludesConfiguration">
+    <file type="web" url="file://$PROJECT_DIR$" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_19" default="true" project-jdk-name="temurin-19" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

README.md

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+# Beispiel um jeden Tag nach den Kalendareinträgen des aktuellen Tages zu schauen
+0 0 * * * java -jar /opt/mail-calendar-reminder/app/build/libs/mail-calendar-reminder-kotlin-1.0-SNAPSHOT-uber.jar /opt/containers/mailu/dav/collection-root/simono41\@brothertec.eu/cd3b21d4-ee8f-ccbe-e98b-f7e0d3e88abb/ notify@brothertec.eu simono41@brothertec.eu passwordString mail.brothertec.eu

build.gradle.kts

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+plugins {
+    kotlin("jvm") version "1.8.21"
+    application
+}
+
+group = "eu.brothertec"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(kotlin("test"))
+
+    // https://mvnrepository.com/artifact/org.mnode.ical4j/ical4j
+    implementation("org.mnode.ical4j:ical4j:3.2.11")
+
+    // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core
+    implementation("org.apache.logging.log4j:log4j-core:2.20.0")
+
+    // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api
+    implementation("org.apache.logging.log4j:log4j-api:2.20.0")
+
+    // https://mvnrepository.com/artifact/jakarta.mail/jakarta.mail-api
+    implementation("jakarta.mail:jakarta.mail-api:2.1.2")
+
+    // https://mvnrepository.com/artifact/org.eclipse.angus/jakarta.mail
+    implementation("org.eclipse.angus:jakarta.mail:2.0.2")
+
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+kotlin {
+    jvmToolchain(19)
+}
+
+application {
+    mainClass.set("MainKt")
+}
+
+tasks.register<Jar>("uberJar") {
+    archiveClassifier.set("uber")
+
+    from(sourceSets.main.get().output)
+
+    dependsOn(configurations.runtimeClasspath)
+
+    manifest {
+        attributes("Main-Class" to "MainKt")
+    }
+
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+
+    from({
+        configurations.runtimeClasspath.get().filter { it.name.endsWith("jar") }.map { zipTree(it) }
+    })
+}

gradle.properties

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+kotlin.code.style=official

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed 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
+#
+#      https://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.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

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+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

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+
+rootProject.name = "mail-calendar-reminder-kotlin"
+

src/main/kotlin/Main.kt

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+import jakarta.mail.*
+import jakarta.mail.internet.InternetAddress
+import jakarta.mail.internet.MimeMessage
+
+import net.fortuna.ical4j.data.CalendarBuilder
+import net.fortuna.ical4j.data.ParserException
+import net.fortuna.ical4j.model.*
+import net.fortuna.ical4j.model.component.VEvent
+import net.fortuna.ical4j.model.property.*
+
+import org.apache.logging.log4j.LogManager
+import org.apache.logging.log4j.Logger
+
+import java.io.File
+import java.io.FileInputStream
+import java.io.IOException
+import java.nio.file.Paths
+import java.time.Instant
+import java.time.LocalDateTime
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
+import java.util.*
+import java.util.Calendar
+import java.util.Date
+import kotlin.system.exitProcess
+
+// https://logging.apache.org/log4j/2.x/manual/configuration.html
+private val logger: Logger = LogManager.getLogger("MainKt")
+
+private var fromString = ""
+private var toString = ""
+private var passwordString = ""
+private var hostString = ""
+
+fun main(args: Array<String>) {
+    println("Hello World!")
+
+    // Try adding program arguments via Run/Debug configuration.
+    // Learn more about running applications: https://www.jetbrains.com/help/idea/running-applications.html.
+    println("Program arguments: ${args.joinToString()}")
+
+    // https://www.baeldung.com/java-jvm-time-zone
+    val calendar = Calendar.getInstance()
+    val timeZone = calendar.timeZone
+    logger.info(
+        "Folgende Zeitzone ist eingestellt: " + timeZone.id + " : "
+                + timeZone.getDisplayName(Locale.GERMAN)
+    )
+
+    // System.setProperty("user.timezone", "Europe/Berlin");
+    // TimeZone.setDefault(TimeZone.getTimeZone("Europe/Berlin"));
+
+    // Use the local default timezone for the implementation of DATE properties https://www.ical4j.org/configuring/
+    System.setProperty("net.fortuna.ical4j.timezone.date.floating", "true")
+    val path = Paths.get("")
+    val directoryName = path.toAbsolutePath().toString()
+    logger.debug("Current Working Directory is = $directoryName")
+    if (args.size <= 4) {
+        logger.error("Es fehlen noch einige Parameter!!!")
+        logger.error("ics-dir, from, to, password, host")
+        exitProcess(1)
+    }
+    fromString = args[1]
+    toString = args[2]
+    passwordString = args[3]
+    hostString = args[4]
+    val folder = File(args[0])
+    logger.info(
+        "folder: " + folder.absolutePath, (" from: " + fromString
+                + " to: " + toString + " password: " + passwordString + " host: " + hostString)
+    )
+    listFilesForFolder(folder)
+}
+
+fun listFilesForFolder(folder: File) {
+    for (file: File in folder.listFiles()!!) {
+        if (file.isFile) {
+            logger.debug(file.absolutePath)
+            getNotifications(file.absolutePath)
+        }
+    }
+}
+
+fun getNotifications(file: String) {
+    try {
+        FileInputStream(file).use { fin ->
+            val builder = CalendarBuilder()
+            val calendar: net.fortuna.ical4j.model.Calendar = builder.build(fin)
+            for (o: Component in calendar.components) {
+                logger.debug("Component: " + o.name)
+                for (o1: Property in o.properties) {
+                    logger.debug(o1.name + ": " + o1.value)
+                }
+            }
+
+            // http://www.cheerfulprogramming.com/blog/2021/03/09/intro-to-ical4j
+            val event: VEvent = calendar.getComponent(Component.VEVENT)
+
+            // https://www.ical4j.org/examples/recur/
+            // https://stackoverflow.com/questions/1005523/how-to-add-one-day-to-a-date
+            // Create the date range which is desired.
+            val dt: Date = Date()
+            val arrival: Calendar = Calendar.getInstance()
+            arrival.time = dt
+            arrival.set(Calendar.SECOND, 1)
+            arrival.set(Calendar.MINUTE, 0)
+            arrival.set(Calendar.HOUR, 0)
+            val departure: Calendar = Calendar.getInstance()
+            departure.time = dt
+            departure.set(Calendar.SECOND, 59)
+            departure.set(Calendar.MINUTE, 59)
+            departure.set(Calendar.HOUR, 23)
+            // departure.add(Calendar.DATE, 1);
+            val fromTime: DateTime = DateTime(arrival.time)
+            val toTime: DateTime = DateTime(departure.time)
+            val period: Period = Period(fromTime, toTime)
+            val list: PeriodList = event.calculateRecurrenceSet(period)
+            for (po: Period in list) {
+                val component: Component = po.component
+                val summary: Summary =
+                    component.getProperty(Property.SUMMARY)
+                val dtStart: DtStart = component.getProperty(Property.DTSTART)
+                val dtEnd: DtEnd = component.getProperty(Property.DTEND)
+                val location: Location? =
+                    component.getProperty(Property.LOCATION)
+                val description: Description? =
+                    component.getProperty(Property.DESCRIPTION)
+
+                // Summary summary = po.getSummary();
+                val messageSubject: String = ("Es existiert für heute ein neuer Kalendereintrag Namens: "
+                        + summary.value)
+                logger.info(messageSubject)
+                var messageText: String = ("Der Termin beginnt heute um: " + formatDateTime(dtStart.date)
+                        + " und endet um: " + formatDateTime(dtEnd.date) + ".")
+                if (location != null) {
+                    messageText += "\n\n Er findet in " + location.value + " statt."
+                }
+                if (description != null) {
+                    messageText += "\n\n Folgende Notiz existiert in diesen Eintrag: \n" + description.value
+                }
+                messageText += "\n\n This email is a service from mail-calendar-reminder Version 0.1. \n Delivered by Simon Rieger"
+                logger.info(messageText)
+                sendMail(messageSubject, messageText)
+            }
+        }
+    } catch (e: IOException) {
+        logger.error(e)
+    } catch (e: ParserException) {
+        logger.error(e)
+    }
+}
+
+private fun formatDateTime(date: Date): String {
+    // In
+    // DateTimeFormatter inFormatter =
+    // DateTimeFormatter.ofPattern("yyyyMMdd'T'HHmmss");
+    // LocalDateTime dateTime = LocalDateTime.parse(date, inFormatter);
+    val dateTime = convertToLocalDateTimeViaMilisecond(date)
+
+    // Out
+    val outFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
+    return dateTime.format(outFormatter)
+}
+
+// https://www.baeldung.com/java-date-to-localdate-and-localdatetime
+fun convertToLocalDateTimeViaMilisecond(dateToConvert: Date): LocalDateTime {
+    return Instant.ofEpochMilli(dateToConvert.time)
+        .atZone(ZoneId.systemDefault())
+        .toLocalDateTime()
+}
+
+private fun sendMail(messageSubject: String, messageText: String) {
+    // configure Mailtrap's SMTP server details
+    // https://stackoverflow.com/questions/43511080/mailconnectexception-couldnt-connect-to-host-port-smtp-gmail-com-465-timeo
+    val props = Properties()
+    props["mail.smtp.auth"] = "true"
+    props["mail.smtp.host"] = hostString
+    props["mail.smtp.port"] = "465"
+    props["mail.transport.protocol"] = "smtp"
+    props["mail.smtp.ssl.enable"] = "true"
+    props["mail.debug"] = "true"
+
+    // create the Session object
+    val authenticator: Authenticator = object : Authenticator() {
+        override fun getPasswordAuthentication(): PasswordAuthentication {
+            return PasswordAuthentication(fromString, passwordString)
+        }
+    }
+    val session = Session.getInstance(props, authenticator)
+    try {
+        // create a MimeMessage object
+        val message: Message = MimeMessage(session)
+        // set From email field
+        message.setFrom(InternetAddress(fromString))
+        // set To email field
+        message.setRecipients(
+            Message.RecipientType.TO,
+            InternetAddress.parse(toString)
+        )
+        // set email subject field
+        message.subject = messageSubject
+        // set the content of the email message
+        message.setText(messageText)
+        // send the email message
+        Transport.send(message)
+        logger.info("Email Message Sent Successfully")
+    } catch (e: MessagingException) {
+        logger.error(e)
+    }
+}

src/main/resources/log4j2.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="ConsoleAppender" target="SYSTEM_OUT">
+            <PatternLayout 
+              pattern="%d [%t] %-5level %logger{36} - %msg%n%throwable"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="DEBUG">
+            <AppenderRef ref="ConsoleAppender"/>
+        </Root>
+    </Loggers>
+</Configuration>