diff --git a/.gitattributes b/.gitattributes
index 5a0d5e4..097f9f9 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,2 +1,9 @@
-# Auto detect text files and perform LF normalization
-* text=auto eol=lf
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
diff --git a/.gitignore b/.gitignore
index e1c082d..c36eb50 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 .bloop/
 .gradle/
+.gradle/
 .idea/
 .metals/
 bin/
diff --git a/build.gradle b/build.gradle
deleted file mode 100644
index 9f4d8ba..0000000
--- a/build.gradle
+++ /dev/null
@@ -1,32 +0,0 @@
-plugins {
-    id "scala"
-    id "java-library"
-}
-
-group "com.tribufu.sdk"
-version "1.0.0"
-
-repositories {
-    mavenCentral()
-    maven { url "https://mvn.tribufu.com/snapshots" }
-}
-
-dependencies {
-    // Use Scala 2.13 in our library project
-    implementation "org.scala-lang:scala-library:2.13.9"
-
-    // This dependency is used internally, and not exposed to consumers on their own compile classpath.
-    implementation "com.google.guava:guava:31.1-jre"
-
-    // Use Scalatest for testing our library
-    testImplementation "junit:junit:4.13.2"
-    testImplementation "org.scalatest:scalatest_2.13:3.2.13"
-    testImplementation "org.scalatestplus:junit-4-13_2.13:3.2.2.0"
-
-    // Need scala-xml at test runtime
-    testRuntimeOnly "org.scala-lang.modules:scala-xml_2.13:1.2.0"
-}
-
-test {
-    useJUnitPlatform()
-}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 41d9927..c1962a7 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 41dfb87..37aef8d 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 1b6c787..aeb74cb 100755
--- a/gradlew
+++ b/gradlew
@@ -55,7 +55,7 @@
 #       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
+#       https://github.com/gradle/gradle/blob/HEAD/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/.
@@ -80,13 +80,10 @@ do
     esac
 done
 
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-APP_NAME="Gradle"
+# This is normally unused
+# shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -143,12 +140,16 @@ fi
 if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
     case $MAX_FD in  #(
       '' | soft) :;; #(
       *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -193,6 +194,10 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
+
+# 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"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in
@@ -205,6 +210,12 @@ set -- \
         org.gradle.wrapper.GradleWrapperMain \
         "$@"
 
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
 # Use "xargs" to parse quoted args.
 #
 # With -n1 it outputs one arg per line, with the quotes and backslashes removed.
diff --git a/gradlew.bat b/gradlew.bat
index 107acd3..93e3f59 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -14,7 +14,7 @@
 @rem limitations under the License.
 @rem
 
-@if "%DEBUG%" == "" @echo off
+@if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
 @rem
 @rem  Gradle startup script for Windows
@@ -25,7 +25,8 @@
 if "%OS%"=="Windows_NT" setlocal
 
 set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
@@ -40,7 +41,7 @@ if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
+if %ERRORLEVEL% equ 0 goto execute
 
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
@@ -75,13 +76,15 @@ set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
 :end
 @rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
+if %ERRORLEVEL% equ 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
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
 
 :mainEnd
 if "%OS%"=="Windows_NT" endlocal
diff --git a/lib/build.gradle b/lib/build.gradle
new file mode 100644
index 0000000..7b7e911
--- /dev/null
+++ b/lib/build.gradle
@@ -0,0 +1,26 @@
+plugins {
+    id "java-library"
+}
+
+version = "0.0.4"
+archivesBaseName = "tribufu"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    api "org.apache.commons:commons-math3:3.6.1"
+    implementation "com.google.guava:guava:31.1-jre"
+    testImplementation "org.junit.jupiter:junit-jupiter:5.9.1"
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
+
+tasks.named("test") {
+    useJUnitPlatform()
+}
diff --git a/lib/src/main/java/com/tribufu/sdk/TribufuClient.java b/lib/src/main/java/com/tribufu/sdk/TribufuClient.java
new file mode 100644
index 0000000..900f2fb
--- /dev/null
+++ b/lib/src/main/java/com/tribufu/sdk/TribufuClient.java
@@ -0,0 +1,39 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+
+package com.tribufu.sdk;
+
+import java.net.http.HttpClient;
+import java.util.HashMap;
+import java.util.Map;
+
+public class TribufuClient {
+    public static final String VERSION = "0.0.0";
+
+    private final long id;
+    private final String secret;
+    private final HttpClient http;
+    private Map<String, String> defaultHeaders;
+
+    public TribufuClient(long id, String secret) {
+        this.id = id;
+        this.secret = secret;
+
+        String targetTriple = "Java";
+        String userAgent = String.format("Tribufu/%s (+https://api.tribufu.com; %s)", VERSION, targetTriple);
+
+        Map<String, String> headers = new HashMap<>();
+        headers.put("User-Agent", userAgent);
+        headers.put("X-Tribufu-Language", "java");
+        headers.put("X-Tribufu-Version", VERSION);
+
+        this.defaultHeaders = headers;
+
+        this.http = HttpClient.newBuilder()
+                .version(HttpClient.Version.HTTP_2)
+                .build();
+    }
+
+    public long getId() {
+        return this.id;
+    }
+}
diff --git a/lib/src/test/java/com/tribufu/sdk/TribufuClientTest.java b/lib/src/test/java/com/tribufu/sdk/TribufuClientTest.java
new file mode 100644
index 0000000..665ed36
--- /dev/null
+++ b/lib/src/test/java/com/tribufu/sdk/TribufuClientTest.java
@@ -0,0 +1,14 @@
+// Copyright (c) TribuFu. All Rights Reserved
+
+package com.tribufu.sdk;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class TribufuClientTest {
+    @Test
+    void clientGetId() {
+        TribufuClient client = new TribufuClient(0, "client_secret");
+        assertEquals(0, client.getId());
+    }
+}
diff --git a/settings.gradle b/settings.gradle
index fcbef66..165c9c5 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1 +1,6 @@
-rootProject.name = "TribuFu"
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.4.0'
+}
+
+rootProject.name = 'SDK-JVM'
+include('lib')
diff --git a/src/main/scala/com/tribufu/sdk/ServiceInfo.scala b/src/main/scala/com/tribufu/sdk/ServiceInfo.scala
deleted file mode 100644
index 625cbae..0000000
--- a/src/main/scala/com/tribufu/sdk/ServiceInfo.scala
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright (c) TribuFu. All Rights Reserved.
-
-package com.tribufu.sdk
-
-class ServiceInfo {
-    def getVersion(): String = "0.0.0"
-}