IGNITE-13197: Import order rule added.

checkstyle/checkstyle.xml

@@ -39,6 +39,15 @@
         <!-- Import Checks. See: http://checkstyle.sourceforge.net/config_imports.html -->
         <module name="RedundantImport"/>
         <module name="UnusedImports"/>
+        <module name="CustomImportOrder">
+            <property name="customImportOrderRules"
+                      value="STANDARD_JAVA_PACKAGE###SPECIAL_IMPORTS###THIRD_PARTY_PACKAGE###STATIC"/>
+            <property name="standardPackageRegExp" value="^java\."/>
+            <property name="specialImportsRegExp" value="^javax\."/>
+            <property name="sortImportsInGroupAlphabetically" value="true"/>
+            <property name="separateLineBetweenGroups" value="false"/>
+        </module>
+        <module name="AvoidStarImport"/>
 
         <!-- Whitespaces: See: https://checkstyle.sourceforge.io/config_whitespace.html -->
         <module name="WhitespaceAround">

examples/src/main/java-lgpl/org/apache/ignite/examples/datagrid/SpatialQueryExample.java

@@ -17,13 +17,15 @@
 
 package org.apache.ignite.examples.datagrid;
 
-import org.apache.ignite.*;
+import java.util.Collection;
+import java.util.Random;
+import javax.cache.Cache;
+import org.apache.ignite.Ignite;
+import org.apache.ignite.IgniteCache;
+import org.apache.ignite.Ignition;
 import org.apache.ignite.cache.query.SqlQuery;
-import org.apache.ignite.cache.query.annotations.*;
-import org.apache.ignite.configuration.*;
-
-import javax.cache.*;
-import java.util.*;
+import org.apache.ignite.cache.query.annotations.QuerySqlField;
+import org.apache.ignite.configuration.CacheConfiguration;
 import org.apache.ignite.examples.ExampleNodeStartup;
 import org.locationtech.jts.geom.Geometry;
 import org.locationtech.jts.io.WKTReader;

examples/src/main/java/org/apache/ignite/examples/binary/computegrid/ComputeClientBinaryTaskExecutionExample.java

@@ -22,9 +22,9 @@
 import java.util.Collection;
 import org.apache.ignite.Ignite;
 import org.apache.ignite.Ignition;
+import org.apache.ignite.binary.BinaryObject;
 import org.apache.ignite.examples.model.Address;
 import org.apache.ignite.examples.model.Employee;
-import org.apache.ignite.binary.BinaryObject;
 
 /**
  * This example demonstrates use of binary objects with task execution.

examples/src/main/java/org/apache/ignite/examples/binary/computegrid/ComputeClientTask.java

@@ -20,12 +20,12 @@
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
+import org.apache.ignite.binary.BinaryObject;
 import org.apache.ignite.compute.ComputeJob;
 import org.apache.ignite.compute.ComputeJobAdapter;
 import org.apache.ignite.compute.ComputeJobResult;
 import org.apache.ignite.compute.ComputeTaskSplitAdapter;
 import org.apache.ignite.lang.IgniteBiTuple;
-import org.apache.ignite.binary.BinaryObject;
 import org.jetbrains.annotations.Nullable;
 
 /**

examples/src/main/java/org/apache/ignite/examples/client/ClientPutGetExample.java

@@ -18,11 +18,11 @@
 package org.apache.ignite.examples.client;
 
 import org.apache.ignite.Ignition;
-import org.apache.ignite.examples.model.Address;
 import org.apache.ignite.client.ClientCache;
+import org.apache.ignite.client.ClientException;
 import org.apache.ignite.client.IgniteClient;
 import org.apache.ignite.configuration.ClientConfiguration;
-import org.apache.ignite.client.ClientException;
+import org.apache.ignite.examples.model.Address;
 
 /**
  * Demonstrates how to use Ignite thin client for basic put/get cache operations.

examples/src/main/java/org/apache/ignite/examples/datagrid/DataRegionsExample.java

@@ -24,8 +24,8 @@
 import org.apache.ignite.cache.CacheAtomicityMode;
 import org.apache.ignite.cache.CacheMode;
 import org.apache.ignite.configuration.CacheConfiguration;
-import org.apache.ignite.configuration.DataStorageConfiguration;
 import org.apache.ignite.configuration.DataRegionConfiguration;
+import org.apache.ignite.configuration.DataStorageConfiguration;
 import org.apache.ignite.examples.ExampleNodeStartup;
 
 /**

examples/src/main/java/org/apache/ignite/examples/ml/dataset/AlgorithmSpecificDatasetExample.java

@@ -17,9 +17,9 @@
 
 package org.apache.ignite.examples.ml.dataset;
 
-import com.github.fommil.netlib.BLAS;
 import java.io.Serializable;
 import java.util.Arrays;
+import com.github.fommil.netlib.BLAS;
 import org.apache.ignite.Ignite;
 import org.apache.ignite.IgniteCache;
 import org.apache.ignite.Ignition;

examples/src/main/java/org/apache/ignite/examples/ml/inference/h2o/H2OMojoModelParserExample.java

@@ -26,14 +26,14 @@
 import org.apache.ignite.Ignite;
 import org.apache.ignite.Ignition;
 import org.apache.ignite.internal.util.IgniteUtils;
+import org.apache.ignite.ml.h2o.H2OMojoModelParser;
 import org.apache.ignite.ml.inference.Model;
 import org.apache.ignite.ml.inference.builder.AsyncModelBuilder;
 import org.apache.ignite.ml.inference.builder.IgniteDistributedModelBuilder;
 import org.apache.ignite.ml.inference.reader.FileSystemModelReader;
 import org.apache.ignite.ml.inference.reader.ModelReader;
 import org.apache.ignite.ml.math.primitives.vector.NamedVector;
 import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
-import org.apache.ignite.ml.h2o.H2OMojoModelParser;
 
 /**
  * This example demonstrates how to import H2O MOJO model and use imported model for distributed inference in Apache

examples/src/main/java/org/apache/ignite/examples/model/Address.java

@@ -18,9 +18,9 @@
 package org.apache.ignite.examples.model;
 
 import org.apache.ignite.binary.BinaryObjectException;
-import org.apache.ignite.binary.Binarylizable;
 import org.apache.ignite.binary.BinaryReader;
 import org.apache.ignite.binary.BinaryWriter;
+import org.apache.ignite.binary.Binarylizable;
 
 /**
  * Employee address.

examples/src/main/java/org/apache/ignite/examples/opencensus/OpenCensusMetricsExporterExample.java

@@ -17,15 +17,15 @@
 
 package org.apache.ignite.examples.opencensus;
 
-import io.opencensus.exporter.stats.prometheus.PrometheusStatsCollector;
-import io.prometheus.client.exporter.HTTPServer;
 import java.awt.Desktop;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.net.URLConnection;
+import io.opencensus.exporter.stats.prometheus.PrometheusStatsCollector;
+import io.prometheus.client.exporter.HTTPServer;
 import org.apache.commons.io.IOUtils;
 import org.apache.ignite.Ignite;
 import org.apache.ignite.IgniteCache;

examples/src/main/spark/org/apache/ignite/examples/spark/JavaIgniteDataFrameWriteExample.java

@@ -17,6 +17,7 @@
 
 package org.apache.ignite.examples.spark;
 
+import java.util.List;
 import org.apache.ignite.Ignite;
 import org.apache.ignite.IgniteCache;
 import org.apache.ignite.Ignition;
@@ -30,8 +31,6 @@
 import org.apache.spark.sql.SaveMode;
 import org.apache.spark.sql.SparkSession;
 
-import java.util.List;
-
 import static org.apache.ignite.internal.util.IgniteUtils.resolveIgnitePath;
 import static org.apache.spark.sql.functions.col;
 import static org.apache.spark.sql.functions.reverse;

examples/src/main/spark/org/apache/ignite/examples/spark/SharedRDDExample.java

@@ -17,6 +17,8 @@
 
 package org.apache.ignite.examples.spark;
 
+import java.util.ArrayList;
+import java.util.List;
 import org.apache.ignite.spark.JavaIgniteContext;
 import org.apache.ignite.spark.JavaIgniteRDD;
 import org.apache.log4j.Level;
@@ -31,9 +33,6 @@
 import org.apache.spark.sql.Dataset;
 import scala.Tuple2;
 
-import java.util.ArrayList;
-import java.util.List;
-
 /**
  * This example demonstrates how to create an JavaIgnitedRDD and share it with multiple spark workers. The goal of this
  * particular example is to provide the simplest code example of this logic.

examples/src/test/java/org/apache/ignite/examples/CacheExamplesSelfTest.java

@@ -18,10 +18,10 @@
 package org.apache.ignite.examples;
 
 import org.apache.ignite.examples.datagrid.CacheAffinityExample;
+import org.apache.ignite.examples.datagrid.CacheApiExample;
 import org.apache.ignite.examples.datagrid.CacheContinuousQueryExample;
 import org.apache.ignite.examples.datagrid.CacheDataStreamerExample;
 import org.apache.ignite.examples.datagrid.CacheEntryProcessorExample;
-import org.apache.ignite.examples.datagrid.CacheApiExample;
 import org.apache.ignite.examples.datagrid.CachePutGetExample;
 import org.apache.ignite.examples.datagrid.CacheQueryExample;
 import org.apache.ignite.examples.datagrid.CacheTransactionExample;

idea/ignite_codeStyle.xml

@@ -21,6 +21,8 @@
   </option>
   <option name="IMPORT_LAYOUT_TABLE">
     <value>
+      <package name="java" withSubpackages="true" static="false" />
+      <package name="javax" withSubpackages="true" static="false" />
       <package name="" withSubpackages="true" static="false" />
       <emptyLine />
       <package name="" withSubpackages="true" static="true" />

modules/aop/src/test/java/org/apache/ignite/gridify/BasicAopSelfTest.java

@@ -17,15 +17,14 @@
 
 package org.apache.ignite.gridify;
 
+import java.util.Collection;
+import java.util.List;
 import org.apache.ignite.compute.ComputeJob;
 import org.apache.ignite.compute.ComputeJobResult;
 import org.apache.ignite.compute.gridify.Gridify;
 import org.apache.ignite.compute.gridify.GridifyArgument;
 import org.apache.ignite.compute.gridify.GridifyTaskSplitAdapter;
 import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
-
-import java.util.Collection;
-import java.util.List;
 import org.junit.Test;
 
 /**

modules/aws/src/main/java/org/apache/ignite/spi/checkpoint/s3/S3CheckpointSpi.java

@@ -17,16 +17,6 @@
 
 package org.apache.ignite.spi.checkpoint.s3;
 
-import com.amazonaws.AmazonClientException;
-import com.amazonaws.AmazonServiceException;
-import com.amazonaws.ClientConfiguration;
-import com.amazonaws.auth.AWSCredentials;
-import com.amazonaws.services.s3.AmazonS3;
-import com.amazonaws.services.s3.AmazonS3Client;
-import com.amazonaws.services.s3.model.ObjectListing;
-import com.amazonaws.services.s3.model.ObjectMetadata;
-import com.amazonaws.services.s3.model.S3Object;
-import com.amazonaws.services.s3.model.S3ObjectSummary;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -37,6 +27,16 @@
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.Map;
+import com.amazonaws.AmazonClientException;
+import com.amazonaws.AmazonServiceException;
+import com.amazonaws.ClientConfiguration;
+import com.amazonaws.auth.AWSCredentials;
+import com.amazonaws.services.s3.AmazonS3;
+import com.amazonaws.services.s3.AmazonS3Client;
+import com.amazonaws.services.s3.model.ObjectListing;
+import com.amazonaws.services.s3.model.ObjectMetadata;
+import com.amazonaws.services.s3.model.S3Object;
+import com.amazonaws.services.s3.model.S3ObjectSummary;
 import org.apache.ignite.Ignite;
 import org.apache.ignite.IgniteCheckedException;
 import org.apache.ignite.IgniteLogger;

modules/aws/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/elb/TcpDiscoveryAlbIpFinder.java

@@ -16,6 +16,10 @@
  */
 package org.apache.ignite.spi.discovery.tcp.ipfinder.elb;
 
+import java.net.InetSocketAddress;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
 import com.amazonaws.auth.AWSCredentialsProvider;
 import com.amazonaws.services.ec2.AmazonEC2;
 import com.amazonaws.services.ec2.AmazonEC2ClientBuilder;
@@ -27,10 +31,6 @@
 import com.amazonaws.services.elasticloadbalancingv2.model.DescribeTargetHealthRequest;
 import com.amazonaws.services.elasticloadbalancingv2.model.TargetDescription;
 import com.amazonaws.services.elasticloadbalancingv2.model.TargetHealthDescription;
-import java.net.InetSocketAddress;
-import java.util.Collection;
-import java.util.LinkedList;
-import java.util.List;
 import org.apache.http.conn.util.InetAddressUtils;
 import org.apache.ignite.spi.IgniteSpiConfiguration;
 import org.apache.ignite.spi.IgniteSpiException;

modules/aws/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/elb/TcpDiscoveryElbIpFinder.java

@@ -16,6 +16,10 @@
  */
 package org.apache.ignite.spi.discovery.tcp.ipfinder.elb;
 
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
 import com.amazonaws.auth.AWSCredentialsProvider;
 import com.amazonaws.services.ec2.AmazonEC2;
 import com.amazonaws.services.ec2.AmazonEC2ClientBuilder;
@@ -26,15 +30,10 @@
 import com.amazonaws.services.elasticloadbalancing.model.DescribeLoadBalancersRequest;
 import com.amazonaws.services.elasticloadbalancing.model.Instance;
 import com.amazonaws.services.elasticloadbalancing.model.LoadBalancerDescription;
-import java.util.ArrayList;
 import org.apache.ignite.spi.IgniteSpiConfiguration;
 import org.apache.ignite.spi.IgniteSpiException;
 import org.apache.ignite.spi.discovery.tcp.ipfinder.TcpDiscoveryIpFinderAdapter;
 
-import java.net.InetSocketAddress;
-import java.util.Collection;
-import java.util.List;
-
 import static com.amazonaws.util.StringUtils.isNullOrEmpty;
 
 /**

modules/aws/src/test/java/org/apache/ignite/spi/checkpoint/s3/S3CheckpointSpiSelfTest.java

@@ -17,16 +17,16 @@
 
 package org.apache.ignite.spi.checkpoint.s3;
 
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.concurrent.ThreadLocalRandom;
 import com.amazonaws.AmazonClientException;
 import com.amazonaws.auth.AWSCredentials;
 import com.amazonaws.auth.BasicAWSCredentials;
 import com.amazonaws.services.s3.AmazonS3;
 import com.amazonaws.services.s3.AmazonS3Client;
 import com.amazonaws.services.s3.model.ObjectListing;
 import com.amazonaws.services.s3.model.S3ObjectSummary;
-import java.net.InetAddress;
-import java.net.UnknownHostException;
-import java.util.concurrent.ThreadLocalRandom;
 import org.apache.ignite.GridTestIoUtils;
 import org.apache.ignite.IgniteCheckedException;
 import org.apache.ignite.internal.IgniteInterruptedCheckedException;

modules/aws/src/test/java/org/apache/ignite/spi/discovery/tcp/ipfinder/s3/client/DummyObjectListing.java

@@ -17,14 +17,14 @@
 
 package org.apache.ignite.spi.discovery.tcp.ipfinder.s3.client;
 
-import com.amazonaws.services.s3.model.ObjectListing;
-import com.amazonaws.services.s3.model.S3ObjectSummary;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Set;
 import java.util.stream.Collectors;
+import com.amazonaws.services.s3.model.ObjectListing;
+import com.amazonaws.services.s3.model.S3ObjectSummary;
 
 /**
  * Class to simulate the functionality of {@link ObjectListing}.

modules/aws/src/test/java/org/apache/ignite/spi/discovery/tcp/ipfinder/s3/client/DummyObjectListingTest.java

@@ -17,11 +17,11 @@
 
 package org.apache.ignite.spi.discovery.tcp.ipfinder.s3.client;
 
-import com.amazonaws.services.s3.model.ObjectListing;
-import com.amazonaws.services.s3.model.S3ObjectSummary;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
+import com.amazonaws.services.s3.model.ObjectListing;
+import com.amazonaws.services.s3.model.S3ObjectSummary;
 import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
 import org.junit.Test;
 

modules/aws/src/test/java/org/apache/ignite/spi/discovery/tcp/ipfinder/s3/client/DummyS3Client.java

@@ -17,6 +17,17 @@
 
 package org.apache.ignite.spi.discovery.tcp.ipfinder.s3.client;
 
+import java.io.File;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
 import com.amazonaws.AmazonWebServiceRequest;
 import com.amazonaws.HttpMethod;
 import com.amazonaws.SdkClientException;
@@ -146,17 +157,6 @@
 import com.amazonaws.services.s3.model.inventory.InventoryConfiguration;
 import com.amazonaws.services.s3.model.metrics.MetricsConfiguration;
 import com.amazonaws.services.s3.waiters.AmazonS3Waiters;
-import java.io.File;
-import java.io.InputStream;
-import java.net.URL;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Set;
-import java.util.stream.Collectors;
 
 /**
  * Class to simulate the functionality of {@link AmazonS3Client}.