Remove unused imports.

Original pull request #1877

Author: ngocnhan-tran1996

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/JdbcCustomConversions.java

@@ -15,14 +15,11 @@
  */
 package org.springframework.data.jdbc.core.convert;
 
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 
-import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.GenericConverter.ConvertiblePair;
-import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.data.convert.CustomConversions;
 import org.springframework.data.jdbc.core.mapping.JdbcSimpleTypes;
 

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/repository/query/JdbcQueryMethod.java

@@ -28,7 +28,6 @@
 import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;
 import org.springframework.data.relational.repository.Lock;
 import org.springframework.data.relational.repository.query.RelationalEntityMetadata;
-import org.springframework.data.relational.repository.query.RelationalParameters;
 import org.springframework.data.relational.repository.query.SimpleRelationalEntityMetadata;
 import org.springframework.data.repository.core.NamedQueries;
 import org.springframework.data.repository.core.RepositoryMetadata;

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/mapping/schema/LiquibaseChangeSetWriterUnitTests.java

@@ -24,7 +24,6 @@
 import liquibase.changelog.ChangeSet;
 import liquibase.changelog.DatabaseChangeLog;
 
-import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
@@ -37,7 +36,6 @@
 import org.springframework.data.relational.core.mapping.Column;
 import org.springframework.data.relational.core.mapping.MappedCollection;
 import org.springframework.data.relational.core.mapping.RelationalMappingContext;
-import org.springframework.data.relational.core.mapping.RelationalPersistentEntity;
 
 /**
  * Unit tests for {@link LiquibaseChangeSetWriter}.

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/DataSourceConfiguration.java

@@ -24,8 +24,6 @@
 
 import javax.sql.DataSource;
 
-import com.zaxxer.hikari.HikariConfig;
-import com.zaxxer.hikari.HikariDataSource;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.awaitility.Awaitility;

spring-data-r2dbc/src/main/java/org/springframework/data/r2dbc/repository/query/ExpressionQuery.java

@@ -19,7 +19,6 @@
 import java.util.List;
 
 import org.springframework.data.repository.query.SpelQueryContext;
-import org.springframework.data.spel.ExpressionDependencies;
 
 /**
  * Query using Spring Expression Language to indicate parameter bindings. Queries using SpEL use {@code :#{…}} to

spring-data-relational/src/main/java/org/springframework/data/relational/core/conversion/SaveBatchingAggregateChange.java

@@ -16,12 +16,9 @@
 package org.springframework.data.relational.core.conversion;
 
 import java.util.ArrayList;
-import java.util.Comparator;
 import java.util.List;
 import java.util.function.Consumer;
 
-import org.springframework.data.mapping.PersistentPropertyPath;
-import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;
 import org.springframework.util.Assert;
 
 /**
@@ -35,9 +32,6 @@
  */
 public class SaveBatchingAggregateChange<T> implements BatchingAggregateChange<T, RootAggregateChange<T>> {
 
-	private static final Comparator<PersistentPropertyPath<RelationalPersistentProperty>> pathLengthComparator = //
-			Comparator.comparing(PersistentPropertyPath::getLength);
-
 	private final Class<T> entityType;
 	private final List<DbAction<?>> rootActions = new ArrayList<>();
 	/**

spring-data-relational/src/main/java/org/springframework/data/relational/core/dialect/MySqlDialect.java

@@ -15,10 +15,8 @@
  */
 package org.springframework.data.relational.core.dialect;
 
-import java.lang.reflect.Array;
 import java.util.Arrays;
 import java.util.Collection;
-import java.util.Collections;
 
 import org.springframework.data.relational.core.sql.IdentifierProcessing;
 import org.springframework.data.relational.core.sql.LockOptions;

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/render/SubselectVisitor.java

@@ -16,7 +16,6 @@
 package org.springframework.data.relational.core.sql.render;
 
 import org.springframework.data.relational.core.sql.Subselect;
-import org.springframework.lang.Nullable;
 
 public class SubselectVisitor extends TypedSubtreeVisitor<Subselect> {