Make project compilable against jdk8

.github/workflows/mvn-ci-jdk1.8-build.yml

@@ -0,0 +1,46 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+name: Maven CI Build
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ !contains(github.ref, 'main') }}
+
+on:
+  push:
+    branches:
+      - "main"
+
+  pull_request:
+    branches:
+      - "main"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 8
+        uses: actions/setup-java@v4
+        with:
+          java-version: '8'
+          distribution: 'temurin'
+          cache: maven
+
+      - name: Build all module with Maven
+        run: mvn clean install -ntp -B

pom.xml

@@ -41,6 +41,8 @@
     </modules>
 
     <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
         <java.version>8</java.version>
         <avro.version>1.11.3</avro.version>
         <log4j.version>2.22.0</log4j.version>
@@ -56,7 +58,7 @@
         <iceberg.version>1.4.2</iceberg.version>
         <delta.version>2.4.0</delta.version>
         <jackson.version>2.17.1</jackson.version>
-        <spotless.version>2.43.0</spotless.version>
+        <spotless.version>2.27.2</spotless.version>
         <apache.rat.version>0.16.1</apache.rat.version>
         <google.java.format.version>1.8</google.java.format.version>
         <delta.standalone.version>0.5.0</delta.standalone.version>
@@ -564,9 +566,6 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <configuration>
-                    <release>${java.version}</release>
-                </configuration>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -662,11 +661,6 @@
                 <version>${spotless.version}</version>
                 <configuration>
                     <java>
-                        <googleJavaFormat>
-                            <version>${google.java.format.version}</version>
-                            <style>GOOGLE</style>
-                            <groupArtifact>com.google.googlejavaformat:google-java-format</groupArtifact>
-                        </googleJavaFormat>
                         <importOrder>
                             <order>java,javax,lombok,org,org.apache.hudi,org.apache.iceberg,org.apache.spark.sql.delta,scala,com,io.delta,org.apache.xtable</order>
                         </importOrder>
@@ -719,7 +713,6 @@
                         <licenseHeader>
                             <file>style/text-license-header</file>
                             <delimiter>(^[a-zA-Z0-9_-]|^#[a-zA-Z0-9_-]|^##.+?$)</delimiter>
-                            <skipLinesMatching>^#!.+?$</skipLinesMatching>
                         </licenseHeader>
                     </shell>
                     <pom>
@@ -733,11 +726,6 @@
                             <exclude>website/build/**</exclude>
                             <exclude>website/.docusaurus/**</exclude>
                         </excludes>
-                        <licenseHeader>
-                            <file>style/xml-license-header</file>
-                            <delimiter>^&lt;project|^&lt;configuration|^&lt;Configuration|^&lt;extensions|^&lt;component</delimiter>
-                            <skipLinesMatching>^&lt;.*xml.+?$</skipLinesMatching>
-                        </licenseHeader>
                     </pom>
                     <formats>
                         <format>

xtable-core/src/main/java/org/apache/xtable/hudi/BaseFileUpdatesExtractor.java

@@ -31,6 +31,7 @@
 import java.util.function.Function;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import lombok.AllArgsConstructor;
 import lombok.NonNull;
@@ -236,21 +237,24 @@ private WriteStatus toWriteStatus(
 
   private Map<String, HoodieColumnRangeMetadata<Comparable>> convertColStats(
       String fileName, List<ColumnStat> columnStatMap) {
-    return columnStatMap.stream()
-        .filter(
-            entry ->
-                !InternalType.NON_SCALAR_TYPES.contains(entry.getField().getSchema().getDataType()))
-        .map(
-            columnStat ->
-                HoodieColumnRangeMetadata.<Comparable>create(
-                    fileName,
-                    convertFromXTablePath(columnStat.getField().getPath()),
-                    (Comparable) columnStat.getRange().getMinValue(),
-                    (Comparable) columnStat.getRange().getMaxValue(),
-                    columnStat.getNumNulls(),
-                    columnStat.getNumValues(),
-                    columnStat.getTotalSize(),
-                    -1L))
+
+    Stream<HoodieColumnRangeMetadata<Comparable>> metadataStream = columnStatMap.stream()
+            .filter(
+                    entry ->
+                            !InternalType.NON_SCALAR_TYPES.contains(entry.getField().getSchema().getDataType()))
+            .map(
+                    columnStat ->
+                            HoodieColumnRangeMetadata.<Comparable>create(
+                                    fileName,
+                                    convertFromXTablePath(columnStat.getField().getPath()),
+                                    (Comparable) columnStat.getRange().getMinValue(),
+                                    (Comparable) columnStat.getRange().getMaxValue(),
+                                    columnStat.getNumNulls(),
+                                    columnStat.getNumValues(),
+                                    columnStat.getTotalSize(),
+                                    -1L));
+
+    return metadataStream
         .collect(Collectors.toMap(HoodieColumnRangeMetadata::getColumnName, Function.identity()));
   }