chore(java): enable separate java builds

.github/workflows/java.yml

@@ -1,4 +1,5 @@
 name: Build and Run Java JNI Tests
+
 on:
   push:
     branches:
@@ -8,6 +9,7 @@ on:
       - java/**
       - rust/**
       - .github/workflows/java.yml
+
 env:
   # This env var is used by Swatinem/rust-cache@v2 for the cache
   # key, so we set it to make sure it is always consistent.
@@ -20,74 +22,75 @@ env:
   # CI builds are faster with incremental disabled.
   CARGO_INCREMENTAL: "0"
   CARGO_BUILD_JOBS: "1"
+
 jobs:
-  linux-build:
+  rust-clippy-fmt:
     runs-on: ubuntu-22.04
-    name: ubuntu-22.04 + Java 11 & 17
+    name: Rust Clippy and Fmt Check
     defaults:
       run:
-        working-directory: ./java
+        working-directory: ./java/core/lance-jni
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
         with:
-          workspaces: java/java-jni
+          workspaces: java/core/lance-jni
+      - name: Install dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y protobuf-compiler libssl-dev
       - name: Run cargo fmt
         run: cargo fmt --check
-        working-directory: ./java/core/lance-jni
+      - name: Rust Clippy
+        run: cargo clippy --all-targets -- -D warnings
+
+  build-and-test-java:
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        java-version: [8, 11, 17]
+    name: Build and Test with Java ${{ matrix.java-version }}
+    defaults:
+      run:
+        working-directory: ./java
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: java/core/lance-jni
       - name: Install dependencies
         run: |
           sudo apt update
           sudo apt install -y protobuf-compiler libssl-dev
-      - name: Install Java 17
-        uses: actions/setup-java@v4
-        with:
-          distribution: temurin
-          java-version: 17
-          cache: "maven"
-      - run: echo "JAVA_17=$JAVA_HOME" >> $GITHUB_ENV
-      - name: Install Java 8
+      - name: Set up Java ${{ matrix.java-version }}
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 8
+          java-version: ${{ matrix.java-version }}
           cache: "maven"
-      - run: echo "JAVA_8=$JAVA_HOME" >> $GITHUB_ENV
-      - name: Install Java 11
-        uses: actions/setup-java@v4
-        with:
-          distribution: temurin
-          java-version: 11
-          cache: "maven"
-      - name: Java Style Check
-        run: mvn checkstyle:check
-      - name: Rust Clippy
-        working-directory: java/core/lance-jni
-        run: cargo clippy --all-targets -- -D warnings
-      - name: Running tests with Java 11
-        run: mvn clean test
-      - name: Running tests with Java 8
-        run: JAVA_HOME=$JAVA_8 mvn clean test   
-      - name: Running tests with Java 17
+      - name: Running tests with Java ${{ matrix.java-version }}
         run: |
-          export JAVA_TOOL_OPTIONS="$JAVA_TOOL_OPTIONS \
-          -XX:+IgnoreUnrecognizedVMOptions \
-          --add-opens=java.base/java.lang=ALL-UNNAMED \
-          --add-opens=java.base/java.lang.invoke=ALL-UNNAMED \
-          --add-opens=java.base/java.lang.reflect=ALL-UNNAMED \
-          --add-opens=java.base/java.io=ALL-UNNAMED \
-          --add-opens=java.base/java.net=ALL-UNNAMED \
-          --add-opens=java.base/java.nio=ALL-UNNAMED \
-          --add-opens=java.base/java.util=ALL-UNNAMED \
-          --add-opens=java.base/java.util.concurrent=ALL-UNNAMED \
-          --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED \
-          --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED \
-          --add-opens=java.base/sun.nio.ch=ALL-UNNAMED \
-          --add-opens=java.base/sun.nio.cs=ALL-UNNAMED \
-          --add-opens=java.base/sun.security.action=ALL-UNNAMED \
-          --add-opens=java.base/sun.util.calendar=ALL-UNNAMED \
-          --add-opens=java.security.jgss/sun.security.krb5=ALL-UNNAMED \
-          -Djdk.reflect.useDirectMethodHandle=false \
-          -Dio.netty.tryReflectionSetAccessible=true"
-          JAVA_HOME=$JAVA_17 mvn clean test   
+          if [ "${{ matrix.java-version }}" == "17" ]; then
+            export JAVA_TOOL_OPTIONS="$JAVA_TOOL_OPTIONS \
+            -XX:+IgnoreUnrecognizedVMOptions \
+            --add-opens=java.base/java.lang=ALL-UNNAMED \
+            --add-opens=java.base/java.lang.invoke=ALL-UNNAMED \
+            --add-opens=java.base/java.lang.reflect=ALL-UNNAMED \
+            --add-opens=java.base/java.io=ALL-UNNAMED \
+            --add-opens=java.base/java.net=ALL-UNNAMED \
+            --add-opens=java.base/java.nio=ALL-UNNAMED \
+            --add-opens=java.base/java.util=ALL-UNNAMED \
+            --add-opens=java.base/java.util.concurrent=ALL-UNNAMED \
+            --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED \
+            --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED \
+            --add-opens=java.base/sun.nio.ch=ALL-UNNAMED \
+            --add-opens=java.base/sun.nio.cs=ALL-UNNAMED \
+            --add-opens=java.base/sun.security.action=ALL-UNNAMED \
+            --add-opens=java.base/sun.util.calendar=ALL-UNNAMED \
+            --add-opens=java.security.jgss/sun.security.krb5=ALL-UNNAMED \
+            -Djdk.reflect.useDirectMethodHandle=false \
+            -Dio.netty.tryReflectionSetAccessible=true"
+          fi
+          mvn clean test

java/core/lance-jni/src/fragment.rs

@@ -34,10 +34,6 @@ use crate::{
     RT,
 };
 
-///////////////////
-// Write Methods //
-///////////////////
-
 //////////////////
 // Read Methods //
 //////////////////
@@ -70,6 +66,9 @@ fn inner_count_rows_native(
     Ok(res)
 }
 
+///////////////////
+// Write Methods //
+///////////////////
 #[no_mangle]
 pub extern "system" fn Java_com_lancedb_lance_Fragment_createWithFfiArray<'local>(
     mut env: JNIEnv<'local>,

java/core/src/main/java/com/lancedb/lance/Dataset.java

@@ -213,7 +213,7 @@ public long latestVersion() {
   /**
    * Count the number of rows in the dataset.
    *
-   * @return num of rows.
+   * @return num of rows
    */
   public int countRows() {
     try (LockManager.ReadLock readLock = lockManager.acquireReadLock()) {