Fix checkstyle

pom.xml

@@ -24,7 +24,7 @@
     <parent>
         <groupId>com.github.jcustenborder.kafka.connect</groupId>
         <artifactId>kafka-connect-parent</artifactId>
-        <version>2.8.0-1</version>
+        <version>3.3.1-1</version>
     </parent>
     <artifactId>kafka-connect-transform-xml</artifactId>
     <version>0.1.5-SNAPSHOT</version>

src/main/java/com/github/jcustenborder/kafka/connect/transform/xml/FromXml.java

@@ -30,13 +30,23 @@
 import org.slf4j.LoggerFactory;
 import org.w3c.dom.Document;
 
-import javax.xml.bind.*;
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBElement;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Marshaller;
+import javax.xml.bind.Unmarshaller;
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.xpath.XPath;
 import javax.xml.xpath.XPathConstants;
 import javax.xml.xpath.XPathFactory;
-import java.io.*;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.File;
+import java.io.StringReader;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;

src/main/java/com/github/jcustenborder/kafka/connect/transform/xml/XSDCompiler.java

@@ -29,7 +29,12 @@
 import org.slf4j.LoggerFactory;
 import org.xml.sax.InputSource;
 
-import javax.tools.*;
+import javax.tools.Diagnostic;
+import javax.tools.DiagnosticCollector;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaFileObject;
+import javax.tools.StandardJavaFileManager;
+import javax.tools.ToolProvider;
 import javax.xml.bind.JAXBContext;
 import javax.xml.bind.JAXBException;
 import java.io.Closeable;
@@ -40,9 +45,14 @@
 import java.net.URLClassLoader;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Set;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
+import java.util.Collections;
 
 public class XSDCompiler implements Closeable {
   private static final Logger log = LoggerFactory.getLogger(XSDCompiler.class);
@@ -53,11 +63,12 @@ public class XSDCompiler implements Closeable {
 
   public XSDCompiler(FromXmlConfig config) {
     this.config = config;
-    try{
+    try {
       this.tempDirectory = Files.createTempDirectory(config.xjcPackage).toFile();
     } catch (IOException tempE) {
       throw new IllegalStateException(tempE);
     }
+
     try {
       this.classLoader = new URLClassLoader(
           new URL[]{