Initial cut for a cuVS Java API

.gitignore

@@ -83,3 +83,8 @@ ivf_pq_index
 # cuvs_bench
 datasets/
 /*.json
+
+# java
+.classpath
+
+

build.sh

@@ -18,14 +18,15 @@ ARGS=$*
 # scripts, and that this script resides in the repo dir!
 REPODIR=$(cd $(dirname $0); pwd)
 
-VALIDARGS="clean libcuvs python rust docs tests bench-ann examples --uninstall  -v -g -n --compile-static-lib --allgpuarch --no-mg --no-cpu --cpu-only --no-shared-libs --no-nvtx --show_depr_warn --incl-cache-stats --time -h"
+VALIDARGS="clean libcuvs python rust java docs tests bench-ann examples --uninstall  -v -g -n --compile-static-lib --allgpuarch --no-mg --no-cpu --cpu-only --no-shared-libs --no-nvtx --show_depr_warn --incl-cache-stats --time -h"
 HELP="$0 [<target> ...] [<flag> ...] [--cmake-args=\"<args>\"] [--cache-tool=<tool>] [--limit-tests=<targets>] [--limit-bench-ann=<targets>] [--build-metrics=<filename>]
  where <target> is:
    clean            - remove all existing build artifacts and configuration (start over)
    libcuvs          - build the cuvs C++ code only. Also builds the C-wrapper library
                       around the C++ code.
    python           - build the cuvs Python package
    rust             - build the cuvs Rust bindings
+   java             - build the cuvs Java bindings
    docs             - build the documentation
    tests            - build the tests
    bench-ann        - build end-to-end ann benchmarks
@@ -61,7 +62,8 @@ SPHINX_BUILD_DIR=${REPODIR}/docs
 DOXYGEN_BUILD_DIR=${REPODIR}/cpp/doxygen
 PYTHON_BUILD_DIR=${REPODIR}/python/cuvs/_skbuild
 RUST_BUILD_DIR=${REPODIR}/rust/target
-BUILD_DIRS="${LIBCUVS_BUILD_DIR} ${PYTHON_BUILD_DIR} ${RUST_BUILD_DIR}"
+JAVA_BUILD_DIR=${REPODIR}/java/cuvs-java/target
+BUILD_DIRS="${LIBCUVS_BUILD_DIR} ${PYTHON_BUILD_DIR} ${RUST_BUILD_DIR} ${JAVA_BUILD_DIR}"
 
 # Set defaults for vars modified by flags to this script
 CMAKE_LOG_LEVEL=""
@@ -451,6 +453,14 @@ if (( ${NUMARGS} == 0 )) || hasArg rust; then
     cargo test
 fi
 
+# Build the cuvs Java bindings 
+if (( ${NUMARGS} == 0 )) || hasArg java; then
+    # build libcuvs first as the Java API depends on it
+    ./$0 libcuvs
+    cd ${REPODIR}/java
+    ./build.sh
+fi
+
 export RAPIDS_VERSION="$(sed -E -e 's/^([0-9]{2})\.([0-9]{2})\.([0-9]{2}).*$/\1.\2.\3/' "${REPODIR}/VERSION")"
 export RAPIDS_VERSION_MAJOR_MINOR="$(sed -E -e 's/^([0-9]{2})\.([0-9]{2})\.([0-9]{2}).*$/\1.\2/' "${REPODIR}/VERSION")"
 

cpp/include/cuvs/neighbors/hnsw.h

@@ -47,7 +47,7 @@ enum cuvsHnswHierarchy {
 
 struct cuvsHnswIndexParams {
   /* hierarchy of the hnsw index */
-  cuvsHnswHierarchy hierarchy;
+  enum cuvsHnswHierarchy hierarchy;
   /** Size of the candidate list during hierarchy construction when hierarchy is `CPU`*/
   int ef_construction;
   /** Number of host threads to use to construct hierarchy when hierarchy is `CPU`

java/README.md

@@ -0,0 +1,14 @@
+Prerequisites
+-------------
+
+* JDK 22
+* Maven 3.9.6 or later
+
+To build this API, please do `./build.sh java` in the top level directory. Since this API is dependent on `libcuvs` it must be noted that `libcuvs` gets built automatically before building this API.
+
+Alternatively, please build libcuvs (`./build.sh libcuvs` from top level directory) before building the Java API with `./build.sh` from this directory.
+
+Building
+--------
+
+`./build.sh` will generate the libcuvs_java.so file in internal/ directory, and then build the final jar file for the cuVS Java API in cuvs-java/ directory.

java/build.sh

@@ -0,0 +1,10 @@
+VERSION="25.02"
+GROUP_ID="com.nvidia.cuvs"
+SO_FILE_PATH="./internal"
+
+cd internal && cmake . && cmake --build . \
+  && cd .. \
+  && mvn install:install-file -DgroupId=$GROUP_ID -DartifactId=cuvs-java-internal -Dversion=$VERSION -Dpackaging=so -Dfile=$SO_FILE_PATH/libcuvs_java.so \
+  && cd cuvs-java \
+  && mvn package \
+  && mvn install:install-file -Dfile=./target/cuvs-java-$VERSION-jar-with-dependencies.jar -DgroupId=$GROUP_ID -DartifactId=cuvs-java -Dversion=$VERSION -Dpackaging=jar

java/cuvs-java/pom.xml

@@ -0,0 +1,164 @@
+<!--
+/*
+ * Copyright (c) 2025, NVIDIA CORPORATION.
+ *
+ * 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
+ *
+ *     http://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.
+ */
+--> 
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.nvidia.cuvs</groupId>
+    <artifactId>cuvs-java</artifactId>
+    <version>25.02</version>
+    <name>cuvs-java</name>
+    <packaging>jar</packaging>
+
+    <properties>
+        <maven.compiler.target>22</maven.compiler.target>
+        <maven.compiler.source>22</maven.compiler.source>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.15.1</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.github.fommil</groupId>
+            <artifactId>jniloader</artifactId>
+            <version>1.1</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>2.0.13</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>2.0.13</version>
+            <scope>runtime</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.carrotsearch.randomizedtesting</groupId>
+            <artifactId>randomizedtesting-runner</artifactId>
+            <version>2.8.2</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.7</version>
+                <configuration>
+                    <systemPropertyVariables>
+                        <java.library.path>${project.build.directory}/classes</java.library.path>
+                    </systemPropertyVariables>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <version>2.10</version>
+                <executions>
+                    <execution>
+                        <id>copy</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>copy</goal>
+                        </goals>
+                        <configuration>
+                            <artifactItems>
+                                <artifactItem>
+                                    <groupId>com.nvidia.cuvs</groupId>
+                                    <artifactId>cuvs-java-internal</artifactId>
+                                    <version>25.02</version>
+                                    <type>so</type>
+                                    <overWrite>false</overWrite>
+                                    <outputDirectory>
+                                        ${project.build.directory}/classes</outputDirectory>
+                                    <destFileName>libcuvs_java.so</destFileName>
+                                </artifactItem>
+                            </artifactItems>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <version>3.4.2</version>
+                <configuration>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                    <archiverConfig>
+                        <duplicateBehavior>add</duplicateBehavior>
+                    </archiverConfig>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>assemble-all</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>2.2</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <mainClass>
+                                com.nvidia.cuvs.examples.CagraExample</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>3.6.2</version>
+                <configuration>
+                    <excludePackageNames>com.nvidia.cuvs.examples,com.nvidia.cuvs.panama</excludePackageNames>
+                    <reportOutputDirectory>${project.build.directory}</reportOutputDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>