Adapt Checkstyle in microbenchmarks module (#4397)
### Changes
- **circe-checksum module:**
- Removed unused imports such as `java.nio.ByteBuffer` and `java.util.zip.Checksum` in `Java8IntHash.java`.
- Removed `java.io.IOException` import in `NativeUtils.java`.
- **microbenchmarks module:**
- Modified the `pom.xml` to enforce Checkstyle by removing the `<skip>true</skip>` configuration.
- Removed unused `ByteBufList` imports from `ProtocolBenchmark.java` and `DigestManagerBenchmark.java`.
Signed-off-by: ZhangJian He <shoothzj@gmail.com>
diff --git a/circe-checksum/src/main/java/com/scurrilous/circe/checksum/Java8IntHash.java b/circe-checksum/src/main/java/com/scurrilous/circe/checksum/Java8IntHash.java
index 2825c61..0065bae 100644
--- a/circe-checksum/src/main/java/com/scurrilous/circe/checksum/Java8IntHash.java
+++ b/circe-checksum/src/main/java/com/scurrilous/circe/checksum/Java8IntHash.java
@@ -22,8 +22,6 @@
import com.scurrilous.circe.IncrementalIntHash;
import com.scurrilous.circe.crc.StandardCrcProvider;
import io.netty.buffer.ByteBuf;
-import java.nio.ByteBuffer;
-import java.util.zip.Checksum;
public class Java8IntHash implements IntHash {
diff --git a/circe-checksum/src/main/java/com/scurrilous/circe/utils/NativeUtils.java b/circe-checksum/src/main/java/com/scurrilous/circe/utils/NativeUtils.java
index 988264c..bd95061 100644
--- a/circe-checksum/src/main/java/com/scurrilous/circe/utils/NativeUtils.java
+++ b/circe-checksum/src/main/java/com/scurrilous/circe/utils/NativeUtils.java
@@ -23,7 +23,6 @@
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
-import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
diff --git a/microbenchmarks/pom.xml b/microbenchmarks/pom.xml
index 2abc99b..2815aa9 100644
--- a/microbenchmarks/pom.xml
+++ b/microbenchmarks/pom.xml
@@ -116,9 +116,6 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
- <configuration>
- <skip>true</skip>
- </configuration>
</plugin>
<plugin>
<groupId>com.github.spotbugs</groupId>
diff --git a/microbenchmarks/src/main/java/org/apache/bookkeeper/bookie/package-info.java b/microbenchmarks/src/main/java/org/apache/bookkeeper/bookie/package-info.java
new file mode 100644
index 0000000..f7c6e14
--- /dev/null
+++ b/microbenchmarks/src/main/java/org/apache/bookkeeper/bookie/package-info.java
@@ -0,0 +1,19 @@
+/*
+ * 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.
+ */
+
+package org.apache.bookkeeper.bookie;
diff --git a/microbenchmarks/src/main/java/org/apache/bookkeeper/proto/ProtocolBenchmark.java b/microbenchmarks/src/main/java/org/apache/bookkeeper/proto/ProtocolBenchmark.java
index 3084636..a448908 100644
--- a/microbenchmarks/src/main/java/org/apache/bookkeeper/proto/ProtocolBenchmark.java
+++ b/microbenchmarks/src/main/java/org/apache/bookkeeper/proto/ProtocolBenchmark.java
@@ -34,7 +34,6 @@
import org.apache.bookkeeper.proto.BookkeeperProtocol.OperationType;
import org.apache.bookkeeper.proto.BookkeeperProtocol.ProtocolVersion;
import org.apache.bookkeeper.proto.BookkeeperProtocol.Request;
-import org.apache.bookkeeper.util.ByteBufList;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
diff --git a/microbenchmarks/src/main/java/org/apache/bookkeeper/proto/checksum/DigestManagerBenchmark.java b/microbenchmarks/src/main/java/org/apache/bookkeeper/proto/checksum/DigestManagerBenchmark.java
index 04fa500..cdf8f5a 100644
--- a/microbenchmarks/src/main/java/org/apache/bookkeeper/proto/checksum/DigestManagerBenchmark.java
+++ b/microbenchmarks/src/main/java/org/apache/bookkeeper/proto/checksum/DigestManagerBenchmark.java
@@ -26,7 +26,6 @@
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import org.apache.bookkeeper.proto.DataFormats.LedgerMetadataFormat.DigestType;
-import org.apache.bookkeeper.util.ByteBufList;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
