chore: Drop support for Java 8 (#1777)

* drop support for Java 8

* Update development.md

Co-authored-by: Oleks V <[email protected]>

---------

Co-authored-by: Oleks V <[email protected]>

Author: andygrove

.github/workflows/pr_build.yml

@@ -46,7 +46,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        java_version: [8, 11, 17]
+        java_version: [11, 17]
         test-target: [rust, java]
         spark-version: ['3.5']
         scala-version: ['2.12', '2.13']
@@ -180,7 +180,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        java_version: [8, 11, 17]
+        java_version: [11, 17]
         test-target: [java]
         spark-version: ['3.4']
         scala-version: ['2.12', '2.13']
@@ -205,7 +205,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-13]
-        java_version: [8, 11, 17]
+        java_version: [11, 17]
         test-target: [rust, java]
         spark-version: ['3.4', '3.5']
         scala-version: ['2.12', '2.13']
@@ -232,7 +232,7 @@ jobs:
   macos-aarch64-test:
     strategy:
       matrix:
-        java_version: [8, 11, 17]
+        java_version: [11, 17]
         test-target: [rust, java]
         spark-version: ['3.4', '3.5']
         scala-version: ['2.12', '2.13']
@@ -318,7 +318,7 @@ jobs:
   macos-aarch64-test-with-old-spark:
     strategy:
       matrix:
-        java_version: [8, 17]
+        java_version: [17]
         test-target: [java]
         spark-version: ['3.4']
         scala-version: ['2.12', '2.13']

docs/source/contributor-guide/development.md

@@ -30,7 +30,7 @@ under the License.
 
 ## Development Setup
 
-1. Make sure `JAVA_HOME` is set and point to JDK 8/11/17 installation.
+1. Make sure `JAVA_HOME` is set and point to JDK using (support matrix)[docs/source/user-guide/installation.md]
 2. Install Rust toolchain. The easiest way is to use
    [rustup](https://rustup.rs).
 

docs/source/user-guide/installation.md

@@ -38,12 +38,12 @@ We recommend only using Comet with Spark versions where we currently have both C
 Other versions may work well enough for development and evaluation purposes.
 
 | Spark Version | Java Version | Scala Version | Comet Tests in CI | Spark Tests in CI |
-| ------------- | ------------ | ------------- |-------------------| ----------------- |
-| 3.4.3         | 8/11/17      | 2.12/2.13     | Yes               | Yes               |
-| 3.5.2         | 8/11/17      | 2.12/2.13     | Partial\*         | No                |
-| 3.5.3         | 8/11/17      | 2.12/2.13     | Partial\*         | No                |
-| 3.5.4         | 8/11/17      | 2.12/2.13     | Partial\*         | Yes               |
-| 3.5.5         | 8/11/17      | 2.12/2.13     | Yes               | Yes               |
+| ------------- | ------------ | ------------- | ----------------- | ----------------- |
+| 3.4.3         | 11/17        | 2.12/2.13     | Yes               | Yes               |
+| 3.5.2         | 11/17        | 2.12/2.13     | Partial\*         | No                |
+| 3.5.3         | 11/17        | 2.12/2.13     | Partial\*         | No                |
+| 3.5.4         | 11/17        | 2.12/2.13     | Partial\*         | Yes               |
+| 3.5.5         | 11/17        | 2.12/2.13     | Yes               | Yes               |
 
 \* For older Spark 3.5.x releases, we do not test the full matrix of supported Java and Scala versions in CI.
 

pom.xml

@@ -627,19 +627,6 @@ under the License.
       </properties>
     </profile>
 
-    <profile>
-      <id>jdk1.8</id>
-      <activation>
-        <jdk>1.8</jdk>
-      </activation>
-      <properties>
-        <java.version>1.8</java.version>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
-        <spotless.version>2.29.0</spotless.version>
-      </properties>
-    </profile>
-
     <profile>
       <id>jdk11</id>
       <activation>