diff --git a/build-all.sh b/build-all.sh
index 237e9cc..4b0eeb6 100644
--- a/build-all.sh
+++ b/build-all.sh
@@ -30,6 +30,7 @@ build_gradle_module() {
 
 chmod +x gradlew
 
+build_gradle_module "spring-data/spring-data-jdbc-converter"
 build_gradle_module "solid"
 build_gradle_module "reactive"
 build_gradle_module "junit/assumptions"
diff --git a/spring-data/spring-data-jdbc-converter/.gitignore b/spring-data/spring-data-jdbc-converter/.gitignore
new file mode 100644
index 0000000..6c01878
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/.gitignore
@@ -0,0 +1,32 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/spring-data/spring-data-jdbc-converter/build.gradle b/spring-data/spring-data-jdbc-converter/build.gradle
new file mode 100644
index 0000000..c99ebf0
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/build.gradle
@@ -0,0 +1,28 @@
+plugins {
+	id 'org.springframework.boot' version '2.2.5.RELEASE'
+	id 'io.spring.dependency-management' version '1.0.9.RELEASE'
+	id 'java'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = '1.8'
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-data-jdbc'
+	testImplementation('org.springframework.boot:spring-boot-starter-test') {
+		exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
+	}
+	implementation 'org.flywaydb:flyway-core'
+	compileOnly 'org.projectlombok:lombok'
+	annotationProcessor 'org.projectlombok:lombok'
+	runtimeOnly 'com.h2database:h2'
+}
+
+test {
+	useJUnitPlatform()
+}
diff --git a/spring-data/spring-data-jdbc-converter/gradle/wrapper/gradle-wrapper.jar b/spring-data/spring-data-jdbc-converter/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..29953ea
Binary files /dev/null and b/spring-data/spring-data-jdbc-converter/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/spring-data/spring-data-jdbc-converter/gradle/wrapper/gradle-wrapper.properties b/spring-data/spring-data-jdbc-converter/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..9492014
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/spring-data/spring-data-jdbc-converter/gradlew b/spring-data/spring-data-jdbc-converter/gradlew
new file mode 100644
index 0000000..cccdd3d
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$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" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/spring-data/spring-data-jdbc-converter/gradlew.bat b/spring-data/spring-data-jdbc-converter/gradlew.bat
new file mode 100644
index 0000000..f955316
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/gradlew.bat
@@ -0,0 +1,84 @@
+@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 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=
+
+@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 init
+
+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 init
+
+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
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+: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 %CMD_LINE_ARGS%
+
+: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
diff --git a/spring-data/spring-data-jdbc-converter/settings.gradle b/spring-data/spring-data-jdbc-converter/settings.gradle
new file mode 100644
index 0000000..0a383dd
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'demo'
diff --git a/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/ConverterConfiguration.java b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/ConverterConfiguration.java
new file mode 100644
index 0000000..ee07b55
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/ConverterConfiguration.java
@@ -0,0 +1,39 @@
+package io.reflectoring;
+
+import java.util.Arrays;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.data.convert.ReadingConverter;
+import org.springframework.data.convert.WritingConverter;
+import org.springframework.data.jdbc.core.convert.JdbcCustomConversions;
+import org.springframework.data.jdbc.repository.config.AbstractJdbcConfiguration;
+
+@Configuration
+class ConverterConfiguration extends AbstractJdbcConfiguration {
+
+  @Override
+  public JdbcCustomConversions jdbcCustomConversions() {
+    return new JdbcCustomConversions(Arrays.asList(
+        new UserIdReadingConverter(),
+        new UserIdWritingConverter()
+    ));
+  }
+
+  @ReadingConverter
+  static class UserIdReadingConverter implements Converter<Long, UserId> {
+
+    @Override
+    public UserId convert(Long source) {
+      return new UserId(source);
+    }
+  }
+
+  @WritingConverter
+  static class UserIdWritingConverter implements Converter<UserId, Long> {
+
+    @Override
+    public Long convert(UserId source) {
+      return source.getValue();
+    }
+  }
+}
diff --git a/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/DemoApplication.java b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/DemoApplication.java
new file mode 100644
index 0000000..bcaa6e1
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/DemoApplication.java
@@ -0,0 +1,15 @@
+package io.reflectoring;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.jdbc.repository.config.EnableJdbcRepositories;
+
+@SpringBootApplication
+@EnableJdbcRepositories
+public class DemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApplication.class, args);
+	}
+
+}
diff --git a/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/User.java b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/User.java
new file mode 100644
index 0000000..ba68813
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/User.java
@@ -0,0 +1,17 @@
+package io.reflectoring;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.relational.core.mapping.Table;
+
+@Data
+@Table("user")
+@AllArgsConstructor
+class User {
+
+  @Id
+  private UserId id;
+  private String name;
+
+}
diff --git a/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/UserId.java b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/UserId.java
new file mode 100644
index 0000000..3f266e1
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/UserId.java
@@ -0,0 +1,10 @@
+package io.reflectoring;
+
+import lombok.Value;
+
+@Value
+class UserId {
+
+  private Long value;
+
+}
diff --git a/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/UserRepository.java b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/UserRepository.java
new file mode 100644
index 0000000..f1f6793
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/UserRepository.java
@@ -0,0 +1,7 @@
+package io.reflectoring;
+
+import org.springframework.data.repository.CrudRepository;
+
+interface UserRepository extends CrudRepository<User, UserId> {
+
+}
diff --git a/spring-data/spring-data-jdbc-converter/src/main/resources/db/migration/V1__create_table.sql b/spring-data/spring-data-jdbc-converter/src/main/resources/db/migration/V1__create_table.sql
new file mode 100644
index 0000000..90a5257
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/src/main/resources/db/migration/V1__create_table.sql
@@ -0,0 +1,4 @@
+create table user(
+  id bigint serial,
+  name varchar(50) not null
+);
\ No newline at end of file
diff --git a/spring-data/spring-data-jdbc-converter/src/test/java/io/reflectoring/UserRepositoryTest.java b/spring-data/spring-data-jdbc-converter/src/test/java/io/reflectoring/UserRepositoryTest.java
new file mode 100644
index 0000000..1f8ba32
--- /dev/null
+++ b/spring-data/spring-data-jdbc-converter/src/test/java/io/reflectoring/UserRepositoryTest.java
@@ -0,0 +1,24 @@
+package io.reflectoring;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.data.jdbc.DataJdbcTest;
+import org.springframework.context.annotation.Import;
+
+@DataJdbcTest
+@Import(ConverterConfiguration.class)
+class UserRepositoryTest {
+
+  @Autowired
+  private UserRepository userRepository;
+
+  @Test
+  void saveUser() {
+    User user = new User(null, "Beeblebrox");
+    User savedUser = userRepository.save(user);
+    assertThat(userRepository.findById(savedUser.getId())).isNotNull();
+  }
+
+}
\ No newline at end of file