Remove spring-boot from the feast serving application

java/datatypes/java/pom.xml

@@ -26,6 +26,10 @@
         their interchanges. These are generated from Protocol Buffers and gRPC
         definitions included in the package.
     </description>
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
     <artifactId>datatypes-java</artifactId>
 
     <parent>

java/pom.xml

@@ -156,6 +156,12 @@
                 <version>${commons.lang3.version}</version>
             </dependency>
 
+            <dependency>
+                <groupId>com.google.inject</groupId>
+                <artifactId>guice</artifactId>
+                <version>5.0.1</version>
+            </dependency>
+
             <!-- Google Cloud -->
             <dependency>
                 <groupId>com.google.cloud</groupId>
@@ -450,6 +456,12 @@
                 <artifactId>log4j-slf4j-impl</artifactId>
                 <version>${log4jVersion}</version>
             </dependency>
+            <dependency>
+                <groupId>org.slf4j</groupId>
+                <artifactId>slf4j-api</artifactId>
+                <version>1.7.30</version>
+            </dependency>
+
 
             <!--
                 Import Spring Boot's dependency management.

java/serving/pom.xml

@@ -46,19 +46,39 @@
       </plugin>
 
       <plugin>
-        <groupId>org.springframework.boot</groupId>
-        <artifactId>spring-boot-maven-plugin</artifactId>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
         <configuration>
-          <skip>false</skip>
+          <archive>
+            <manifest>
+              <addClasspath>true</addClasspath>
+              <mainClass>feast.serving.ServingGuiceApplication</mainClass>
+            </manifest>
+          </archive>
         </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-assembly-plugin</artifactId>
         <executions>
           <execution>
-            <id>build-info</id>
+            <phase>package</phase>
             <goals>
-              <goal>build-info</goal>
+              <goal>single</goal>
             </goals>
           </execution>
         </executions>
+        <configuration>
+          <descriptorRefs>
+            <descriptorRef>jar-with-dependencies</descriptorRef>
+          </descriptorRefs>
+          <archive>
+            <manifest>
+              <mainClass>feast.serving.ServingGuiceApplication</mainClass>
+            </manifest>
+          </archive>
+        </configuration>
       </plugin>
 
     </plugins>
@@ -84,53 +104,28 @@
       <version>${project.version}</version>
     </dependency>
 
+    <dependency>
+      <groupId>com.google.inject</groupId>
+      <artifactId>guice</artifactId>
+      <version>5.0.1</version>
+    </dependency>
+
     <!-- TODO: SLF4J is being used via Lombok, but also jog4j - pick one -->
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
     </dependency>
 
     <dependency>
-      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-configuration-processor</artifactId>
-      <optional>true</optional>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-simple</artifactId>
     </dependency>
 
-    <!--compile "org.springframework.boot:spring-boot-starter-web:${spring.boot.version}"-->
-    <dependency>
-      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-starter-web</artifactId>
-    </dependency>
-    <!--compile 'org.springframework.boot:spring-boot-starter-log4j2'-->
-    <dependency>
-      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-starter-log4j2</artifactId>
-    </dependency>
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-web</artifactId>
     </dependency>
 
-    <dependency>
-      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-devtools</artifactId>
-      <optional>true</optional>
-    </dependency>
-
-    <!--compile "org.springframework.boot:spring-boot-starter-actuator:${springBootVersion}"-->
-    <dependency>
-      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-starter-actuator</artifactId>
-    </dependency>
-
-    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
-    <dependency>
-      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-test</artifactId>
-      <version>2.3.1.RELEASE</version>
-      <scope>test</scope>
-    </dependency>
-
     <!--compile "io.grpc:grpc-services:${grpc.version}"-->
     <dependency>
       <groupId>io.grpc</groupId>
@@ -199,11 +194,6 @@
       <artifactId>simpleclient_servlet</artifactId>
       <version>0.8.0</version>
     </dependency>
-    <dependency>
-      <groupId>io.prometheus</groupId>
-      <artifactId>simpleclient_spring_boot</artifactId>
-      <version>0.8.0</version>
-    </dependency>
 
     <dependency>
       <groupId>com.google.auto.value</groupId>
@@ -242,18 +232,6 @@
       <groupId>io.grpc</groupId>
       <artifactId>grpc-testing</artifactId>
     </dependency>
-    <!--testCompile 'org.springframework.boot:spring-boot-starter-test'-->
-    <dependency>
-      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-starter-test</artifactId>
-      <scope>test</scope>
-      <exclusions>
-        <exclusion>
-          <groupId>org.junit.vintage</groupId>
-          <artifactId>junit-vintage-engine</artifactId>
-        </exclusion>
-      </exclusions>
-    </dependency>
 
     <dependency>
       <groupId>org.mockito</groupId>
@@ -315,11 +293,6 @@
       <artifactId>jakarta.validation-api</artifactId>
       <version>${jakarta.validation.api.version}</version>
     </dependency>
-    <dependency>
-      <groupId>net.devh</groupId>
-      <artifactId>grpc-server-spring-boot-starter</artifactId>
-      <version>${grpc.spring.boot.starter.version}</version>
-    </dependency>
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>testcontainers</artifactId>

java/serving/src/main/java/feast/serving/ServingGuiceApplication.java

@@ -0,0 +1,46 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright 2018-2021 The Feast 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.
+ */
+package feast.serving;
+
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import feast.serving.config.*;
+import io.grpc.Server;
+import java.io.IOException;
+
+public class ServingGuiceApplication {
+
+  public static void main(String[] args) throws InterruptedException, IOException {
+    if (args.length == 0) {
+      throw new RuntimeException(
+          "Path to application configuration file needs to be specifed via CLI");
+    }
+
+    final Injector i =
+        Guice.createInjector(
+            new ServingServiceConfigV2(),
+            new RegistryConfig(),
+            new InstrumentationConfig(),
+            new ServerModule(),
+            new ApplicationPropertiesModule(args));
+
+    Server server = i.getInstance(Server.class);
+
+    server.start();
+    server.awaitTermination();
+  }
+}