Remove checkstyle and scala style

.github/workflows/backend.yml

@@ -52,7 +52,7 @@ jobs:
         with:
           submodules: true
       - name: Check code style
-        run: ./mvnw --batch-mode --quiet --no-snapshot-updates clean checkstyle:check
+        run: ./mvnw --batch-mode --quiet --no-snapshot-updates clean spotless:check
 
   dead-link:
     if: github.repository == 'apache/incubator-seatunnel'
@@ -101,9 +101,8 @@ jobs:
           cache: 'maven'
       - name: Build distribution tar
         run: >-
-          ./mvnw -B install scalastyle:check
+          ./mvnw -B install
           -D"maven.test.skip"=true
-          -D"checkstyle.skip"=true
           -D"license.skipAddThirdParty"=true
           -D"http.keepAlive"=false
           -D"maven.wagon.http.pool"=false
@@ -130,8 +129,6 @@ jobs:
           ./mvnw -B -q install -DskipTests
           -D"maven.test.skip"=true
           -D"maven.javadoc.skip"=true
-          -D"scalastyle.skip"=true
-          -D"checkstyle.skip"=true
           -D"license.skipAddThirdParty"
       - name: Check Dependencies Licenses
         run: tools/dependencies/checkLicense.sh
@@ -155,7 +152,7 @@ jobs:
           cache: 'maven'
       - name: Run Unit tests
         run: |
-          ./mvnw -B -T 1C clean verify -D"maven.test.skip"=false -D"checkstyle.skip"=true -D"scalastyle.skip"=true -D"license.skipAddThirdParty"=true --no-snapshot-updates
+          ./mvnw -B -T 1C clean verify -D"maven.test.skip"=false -D"license.skipAddThirdParty"=true --no-snapshot-updates
         env:
           MAVEN_OPTS: -Xmx2048m
 
@@ -178,6 +175,6 @@ jobs:
           cache: 'maven'
       - name: Run Integration tests
         run: |
-          ./mvnw -T 1C -B verify -DskipUT=true -DskipIT=false -D"checkstyle.skip"=true -D"scalastyle.skip"=true -D"license.skipAddThirdParty"=true --no-snapshot-updates
+          ./mvnw -T 1C -B verify -DskipUT=true -DskipIT=false -D"license.skipAddThirdParty"=true --no-snapshot-updates
         env:
           MAVEN_OPTS: -Xmx2048m

.github/workflows/codeql.yaml

@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     env:
-      JAVA_TOOL_OPTIONS: -Xmx2G -Xms2G -Dhttp.keepAlive=false -Dmaven.test.skip=true -Dcheckstyle.skip=true -Dlicense.skipAddThirdParty=true -Dhttp.keepAlive=false -Dmaven.wagon.http.pool=false -Dmaven.wagon.http.retryHandler.count=3 -Dmaven.wagon.httpconnectionManager.ttlSeconds=120
+      JAVA_TOOL_OPTIONS: -Xmx2G -Xms2G -Dhttp.keepAlive=false -Dmaven.test.skip=true -Dlicense.skipAddThirdParty=true -Dhttp.keepAlive=false -Dmaven.wagon.http.pool=false -Dmaven.wagon.http.retryHandler.count=3 -Dmaven.wagon.httpconnectionManager.ttlSeconds=120
 
     strategy:
       fail-fast: false

.github/workflows/docker.yml

@@ -54,7 +54,6 @@ jobs:
         run: |
           ./mvnw -B package \
                  -Dmaven.test.skip=true \
-                 -Dcheckstyle.skip=true \
                  -Dlicense.skipAddThirdParty=true \
                  -Dhttp.keepAlive=false \
                  -Dmaven.wagon.http.pool=false \

.github/workflows/license.yml

@@ -67,7 +67,7 @@ jobs:
             ${{ runner.os }}-maven-
       - name: Generate THIRD-PARTY
         run: |
-          ./mvnw clean license:aggregate-add-third-party -DskipTests -Dcheckstyle.skip -U
+          ./mvnw clean license:aggregate-add-third-party -DskipTests -U
       - name: Check LICENSE file
         run: |
           python3 tools/dependencies/license.py seatunnel-dist/target/THIRD-PARTY.txt seatunnel-dist/release-docs/LICENSE true

.github/workflows/publish-docker.yaml

@@ -68,7 +68,6 @@ jobs:
           ./mvnw -B clean deploy \
           -Dmaven.test.skip \
           -Dmaven.javadoc.skip \
-          -Dmaven.checkstyle.skip \
           -Dlicense.skipAddThirdParty=true \
           -Dmaven.deploy.skip \
           -Ddocker.tag=${{ github.sha }} \

docs/en/contribution/setup.md

@@ -36,7 +36,9 @@ Otherwise, your code could not start in JetBrains IntelliJ IDEA correctly.
 ```
 
 ### Building SeaTunnel from source
+
 After you install the maven, you can use the follow command to compile and package.
+
 ```
 mvn clean package -pl seatunnel-dist -am -Dmaven.test.skip=true
 ```
@@ -52,13 +54,19 @@ See [install plugins for IDEA](https://www.jetbrains.com/help/idea/managing-plug
 Before running the following example, you should also install JetBrains IntelliJ IDEA's [Lombok plugin](https://plugins.jetbrains.com/plugin/6317-lombok).
 See [install plugins for IDEA](https://www.jetbrains.com/help/idea/managing-plugins.html#install-plugins) if you want to.
 
-### Install JetBrains IDEA CheckStyle-IDEA Plugin
+### Code Style
 
-Before coding, you should also install JetBrains IntelliJ IDEA's [CheckStyle-IDEA plugin](https://plugins.jetbrains.com/plugin/1065-checkstyle-idea).
-See [install plugins for IDEA](https://www.jetbrains.com/help/idea/managing-plugins.html#install-plugins) if you want to.
-Next, you should go to `Preferences -> Editor -> Code style -> Scheme -> Import Scheme -> CheckStyle Configration` and import `tools/checkstyle/checkStyle.xml`
-![checkstyle.png](../images/checkstyle.png)
-If you want to change to automatically formatting, these configurations are also required.
+SeaTunnel uses `Spotless` for code style and formatting checks.
+You could run the following command and `Spotless` will automatically fix
+the code style and formatting errors for you:
+
+```shell
+./mvnw spotless:apply
+```
+
+You could copy the `pre-commit hook` file `/tools/style/pre-commit` to your `.git/hooks/`
+directory so that every time you commit your code with `git commit`, `Spotless` will automatically
+fix things for you.
 
 ## Run Simple Example
 
@@ -69,7 +77,6 @@ it in IDEA](https://www.jetbrains.com/help/idea/run-debug-configuration.html) as
 Here we use `seatunnel-examples/seatunnel-flink-examples/src/main/java/org/apache/seatunnel/example/flink/LocalFlinkExample.java`
 as an example, when you run it successfully you could see the output as below:
 
-
 ```log
 +I[Ricky Huo, 71]
 +I[Gary, 12]
@@ -83,7 +90,7 @@ as an example, when you run it successfully you could see the output as below:
 
 All our examples use simple source and sink to make it less dependent and easy to run. You can change the example configuration
 in `resources/examples`. You could change your configuration as below, if you want to use PostgreSQL as the source and
-sink to console. 
+sink to console.
 
 ```conf
 env {
@@ -103,3 +110,4 @@ sink {
   ConsoleSink {}
 }
 ```
+