diff --git a/examples/.idea/misc.xml b/examples/.idea/misc.xml
index 11f86d2..542659b 100644
--- a/examples/.idea/misc.xml
+++ b/examples/.idea/misc.xml
@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="PDMPlugin">
+    <option name="skipTestSources" value="false" />
+  </component>
   <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build" />
   </component>
diff --git a/src/main/java/rife/bld/extension/CheckstyleOperation.java b/src/main/java/rife/bld/extension/CheckstyleOperation.java
index b36c7bb..34e6e72 100644
--- a/src/main/java/rife/bld/extension/CheckstyleOperation.java
+++ b/src/main/java/rife/bld/extension/CheckstyleOperation.java
@@ -79,6 +79,8 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
     /**
      * Directory/file to exclude from CheckStyle. The path can be the full, absolute path, or relative to the current
      * path. Multiple excludes are allowed.
+     *
+     * @see #sourceDir(Collection)
      */
     public CheckstyleOperation exclude(String... path) {
         for (var p : path) {
@@ -87,6 +89,19 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
         return this;
     }
 
+    /**
+     * Directory/file to exclude from CheckStyle. The path can be the full, absolute path, or relative to the current
+     * path. Multiple excludes are allowed.
+     *
+     * @see #exclude(String...)
+     */
+    public CheckstyleOperation exclude(Collection<String> path) {
+        for (var p : path) {
+            optionsWithArg.put("-e", p);
+        }
+        return this;
+    }
+
     /**
      * Directory/file pattern to exclude from CheckStyle. Multiple excludes are allowed.
      */
@@ -219,12 +234,24 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
 
     /**
      * Specified the file(s) or folder(s) containing the source files to check.
+     *
+     * @see #sourceDir(Collection)
      */
     public CheckstyleOperation sourceDir(String... dir) {
         sourceDirs.addAll(Arrays.asList(dir));
         return this;
     }
 
+    /**
+     * Specified the file(s) or folder(s) containing the source files to check.
+     *
+     * @see #sourceDir(String...)
+     */
+    public CheckstyleOperation sourceDir(Collection<String> dir) {
+        sourceDirs.addAll(dir);
+        return this;
+    }
+
     /**
      * Sets the length of the tab character. Used only with the {@link #lineColumn(String) lineColum} option.
      * Default value is {@code 8}.
diff --git a/src/test/java/rife/bld/extension/CheckstyleOperationTest.java b/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
index 650dc1f..edd223f 100644
--- a/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
+++ b/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
@@ -24,13 +24,17 @@ import rife.bld.operations.exceptions.ExitStatusException;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.List;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
 
 
 class CheckstyleOperationTest {
+    private static final String ADD = "add";
     private static final String BAR = "bar";
     private static final String FOO = "foo";
+    private static final String REMOVE = "remove";
 
     @Test
     void branchMatchingXpath() {
@@ -47,15 +51,17 @@ class CheckstyleOperationTest {
     @Test
     void debug() {
         var op = new CheckstyleOperation().fromProject(new Project()).debug(true);
-        assertThat(op.options.contains("-d")).as("add").isTrue();
+        assertThat(op.options.contains("-d")).as(ADD).isTrue();
         op = op.debug(false);
-        assertThat(op.options.contains("-d")).as("remove").isFalse();
+        assertThat(op.options.contains("-d")).as(REMOVE).isFalse();
     }
 
     @Test
     void exclude() {
         var op = new CheckstyleOperation().fromProject(new Project()).exclude(FOO);
         assertThat(op.optionsWithArg.get("-e")).isEqualTo(FOO);
+        op = new CheckstyleOperation().fromProject(new Project()).exclude(List.of(FOO));
+        assertThat(op.optionsWithArg.get("-e")).as("as list").isEqualTo(FOO);
     }
 
     @Test
@@ -66,7 +72,7 @@ class CheckstyleOperationTest {
 
     @Test
     void execute() throws IOException, ExitStatusException, InterruptedException {
-        var tmpFile = File.createTempFile("checkstyle", ".txt");
+        var tmpFile = File.createTempFile("checkstyle-google", ".txt");
         tmpFile.deleteOnExit();
         var op = new CheckstyleOperation()
                 .fromProject(new WebProject())
@@ -90,19 +96,32 @@ class CheckstyleOperationTest {
                 .startsWith("java -cp ")
                 .endsWith(
                         "com.puppycrawl.tools.checkstyle.Main " +
-                        "-d -E " +
-                        "-p config/checkstyle.properties " +
-                        "-b xpath " +
-                        "-c config/checkstyle.xml " +
-                        "src/main/java src/test/java");
+                                "-d -E " +
+                                "-p config/checkstyle.properties " +
+                                "-b xpath " +
+                                "-c config/checkstyle.xml " +
+                                "src/main/java src/test/java");
     }
 
     @Test
     void executeIgnoredModules() {
         var op = new CheckstyleOperation().fromProject(new Project()).executeIgnoredModules(true);
-        assertThat(op.options.contains("-E")).as("add").isTrue();
+        assertThat(op.options.contains("-E")).as(ADD).isTrue();
         op = op.executeIgnoredModules(false);
-        assertThat(op.options.contains("-E")).as("remove").isFalse();
+        assertThat(op.options.contains("-E")).as(REMOVE).isFalse();
+    }
+
+    @Test
+    void executeSunChecks() throws IOException {
+        var tmpFile = File.createTempFile("checkstyle-sun", ".txt");
+        tmpFile.deleteOnExit();
+        var op = new CheckstyleOperation()
+                .fromProject(new WebProject())
+                .sourceDir(List.of("src/main/java", "src/test/java"))
+                .configurationFile("src/test/resources/sun_checks.xml")
+                .output(tmpFile.getAbsolutePath());
+        assertThatCode(op::execute).isInstanceOf(ExitStatusException.class);
+        assertThat(tmpFile).exists();
     }
 
     @Test
@@ -114,17 +133,17 @@ class CheckstyleOperationTest {
     @Test
     void generateXpathSuppression() {
         var op = new CheckstyleOperation().fromProject(new Project()).generateXpathSuppression(true);
-        assertThat(op.options.contains("-g")).as("add").isTrue();
+        assertThat(op.options.contains("-g")).as(ADD).isTrue();
         op = op.generateXpathSuppression(false);
-        assertThat(op.options.contains("-g")).as("remove").isFalse();
+        assertThat(op.options.contains("-g")).as(REMOVE).isFalse();
     }
 
     @Test
     void javadocTree() {
         var op = new CheckstyleOperation().fromProject(new Project()).javadocTree(true);
-        assertThat(op.options.contains("-j")).as("add").isTrue();
+        assertThat(op.options.contains("-j")).as(ADD).isTrue();
         op = op.javadocTree(false);
-        assertThat(op.options.contains("-j")).as("remove").isFalse();
+        assertThat(op.options.contains("-j")).as(REMOVE).isFalse();
     }
 
     @Test
@@ -162,24 +181,24 @@ class CheckstyleOperationTest {
     @Test
     void tree() {
         var op = new CheckstyleOperation().fromProject(new Project()).tree(true);
-        assertThat(op.options.contains("-t")).as("add").isTrue();
+        assertThat(op.options.contains("-t")).as(ADD).isTrue();
         op = op.tree(false);
-        assertThat(op.options.contains("-t")).as("remove").isFalse();
+        assertThat(op.options.contains("-t")).as(REMOVE).isFalse();
     }
 
     @Test
     void treeWithComments() {
         var op = new CheckstyleOperation().fromProject(new Project()).treeWithComments(true);
-        assertThat(op.options.contains("-T")).as("add").isTrue();
+        assertThat(op.options.contains("-T")).as(ADD).isTrue();
         op = op.treeWithComments(false);
-        assertThat(op.options.contains("-T")).as("remove").isFalse();
+        assertThat(op.options.contains("-T")).as(REMOVE).isFalse();
     }
 
     @Test
     void treeWithJavadoc() {
         var op = new CheckstyleOperation().fromProject(new Project()).treeWithJavadoc(true);
-        assertThat(op.options.contains("-J")).as("add").isTrue();
+        assertThat(op.options.contains("-J")).as(ADD).isTrue();
         op = op.treeWithJavadoc(false);
-        assertThat(op.options.contains("-J")).as("remove").isFalse();
+        assertThat(op.options.contains("-J")).as(REMOVE).isFalse();
     }
 }
\ No newline at end of file
diff --git a/src/test/resources/sun_checks.xml b/src/test/resources/sun_checks.xml
new file mode 100644
index 0000000..1278ab7
--- /dev/null
+++ b/src/test/resources/sun_checks.xml
@@ -0,0 +1,198 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+          "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+          "https://checkstyle.org/dtds/configuration_1_3.dtd">
+
+<!--
+
+  Checkstyle configuration that checks the sun coding conventions from:
+
+    - the Java Language Specification at
+      https://docs.oracle.com/javase/specs/jls/se11/html/index.html
+
+    - the Sun Code Conventions at https://www.oracle.com/java/technologies/javase/codeconventions-contents.html
+
+    - the Javadoc guidelines at
+      https://www.oracle.com/technical-resources/articles/java/javadoc-tool.html
+
+    - the JDK Api documentation https://docs.oracle.com/en/java/javase/11/
+
+    - some best practices
+
+  Checkstyle is very configurable. Be sure to read the documentation at
+  https://checkstyle.org (or in your downloaded distribution).
+
+  Most Checks are configurable, be sure to consult the documentation.
+
+  To completely disable a check, just comment it out or delete it from the file.
+  To suppress certain violations please review suppression filters.
+
+  Finally, it is worth reading the documentation.
+
+-->
+
+<module name="Checker">
+  <!--
+      If you set the basedir property below, then all reported file
+      names will be relative to the specified directory. See
+      https://checkstyle.org/config.html#Checker
+
+      <property name="basedir" value="${basedir}"/>
+  -->
+  <property name="severity" value="error"/>
+
+  <property name="fileExtensions" value="java, properties, xml"/>
+
+  <!-- Excludes all 'module-info.java' files              -->
+  <!-- See https://checkstyle.org/filefilters/index.html -->
+  <module name="BeforeExecutionExclusionFileFilter">
+    <property name="fileNamePattern" value="module\-info\.java$"/>
+  </module>
+
+  <!-- https://checkstyle.org/filters/suppressionfilter.html -->
+  <module name="SuppressionFilter">
+    <property name="file" value="${org.checkstyle.sun.suppressionfilter.config}"
+              default="checkstyle-suppressions.xml" />
+    <property name="optional" value="true"/>
+  </module>
+
+  <!-- Checks that a package-info.java file exists for each package.     -->
+  <!-- See https://checkstyle.org/checks/javadoc/javadocpackage.html#JavadocPackage -->
+  <module name="JavadocPackage"/>
+
+  <!-- Checks whether files end with a new line.                        -->
+  <!-- See https://checkstyle.org/checks/misc/newlineatendoffile.html -->
+  <module name="NewlineAtEndOfFile"/>
+
+  <!-- Checks that property files contain the same keys.         -->
+  <!-- See https://checkstyle.org/checks/misc/translation.html -->
+  <module name="Translation"/>
+
+  <!-- Checks for Size Violations.                    -->
+  <!-- See https://checkstyle.org/checks/sizes/index.html -->
+  <module name="FileLength"/>
+  <module name="LineLength">
+    <property name="fileExtensions" value="java"/>
+  </module>
+
+  <!-- Checks for whitespace                               -->
+  <!-- See https://checkstyle.org/checks/whitespace/index.html -->
+  <module name="FileTabCharacter"/>
+
+  <!-- Miscellaneous other checks.                   -->
+  <!-- See https://checkstyle.org/checks/misc/index.html -->
+  <module name="RegexpSingleline">
+    <property name="format" value="\s+$"/>
+    <property name="minimum" value="0"/>
+    <property name="maximum" value="0"/>
+    <property name="message" value="Line has trailing spaces."/>
+  </module>
+
+  <!-- Checks for Headers                                -->
+  <!-- See https://checkstyle.org/checks/header/index.html   -->
+  <!-- <module name="Header"> -->
+  <!--   <property name="headerFile" value="${checkstyle.header.file}"/> -->
+  <!--   <property name="fileExtensions" value="java"/> -->
+  <!-- </module> -->
+
+  <module name="TreeWalker">
+
+    <!-- Checks for Javadoc comments.                     -->
+    <!-- See https://checkstyle.org/checks/javadoc/index.html -->
+    <module name="InvalidJavadocPosition"/>
+    <module name="JavadocMethod"/>
+    <module name="JavadocType"/>
+    <module name="JavadocVariable"/>
+    <module name="JavadocStyle"/>
+    <module name="MissingJavadocMethod"/>
+
+    <!-- Checks for Naming Conventions.                  -->
+    <!-- See https://checkstyle.org/checks/naming/index.html -->
+    <module name="ConstantName"/>
+    <module name="LocalFinalVariableName"/>
+    <module name="LocalVariableName"/>
+    <module name="MemberName"/>
+    <module name="MethodName"/>
+    <module name="PackageName"/>
+    <module name="ParameterName"/>
+    <module name="StaticVariableName"/>
+    <module name="TypeName"/>
+
+    <!-- Checks for imports                              -->
+    <!-- See https://checkstyle.org/checks/imports/index.html -->
+    <module name="AvoidStarImport"/>
+    <module name="IllegalImport"/> <!-- defaults to sun.* packages -->
+    <module name="RedundantImport"/>
+    <module name="UnusedImports">
+      <property name="processJavadoc" value="false"/>
+    </module>
+
+    <!-- Checks for Size Violations.                    -->
+    <!-- See https://checkstyle.org/checks/sizes/index.html -->
+    <module name="MethodLength"/>
+    <module name="ParameterNumber"/>
+
+    <!-- Checks for whitespace                               -->
+    <!-- See https://checkstyle.org/checks/whitespace/index.html -->
+    <module name="EmptyForIteratorPad"/>
+    <module name="GenericWhitespace"/>
+    <module name="MethodParamPad"/>
+    <module name="NoWhitespaceAfter"/>
+    <module name="NoWhitespaceBefore"/>
+    <module name="OperatorWrap"/>
+    <module name="ParenPad"/>
+    <module name="TypecastParenPad"/>
+    <module name="WhitespaceAfter"/>
+    <module name="WhitespaceAround"/>
+
+    <!-- Modifier Checks                                    -->
+    <!-- See https://checkstyle.org/checks/modifier/index.html -->
+    <module name="ModifierOrder"/>
+    <module name="RedundantModifier"/>
+
+    <!-- Checks for blocks. You know, those {}'s         -->
+    <!-- See https://checkstyle.org/checks/blocks/index.html -->
+    <module name="AvoidNestedBlocks"/>
+    <module name="EmptyBlock"/>
+    <module name="LeftCurly"/>
+    <module name="NeedBraces"/>
+    <module name="RightCurly"/>
+
+    <!-- Checks for common coding problems               -->
+    <!-- See https://checkstyle.org/checks/coding/index.html -->
+    <module name="EmptyStatement"/>
+    <module name="EqualsHashCode"/>
+    <module name="HiddenField"/>
+    <module name="IllegalInstantiation"/>
+    <module name="InnerAssignment"/>
+    <module name="MagicNumber"/>
+    <module name="MissingSwitchDefault"/>
+    <module name="MultipleVariableDeclarations"/>
+    <module name="SimplifyBooleanExpression"/>
+    <module name="SimplifyBooleanReturn"/>
+
+    <!-- Checks for class design                         -->
+    <!-- See https://checkstyle.org/checks/design/index.html -->
+    <module name="DesignForExtension"/>
+    <module name="FinalClass"/>
+    <module name="HideUtilityClassConstructor"/>
+    <module name="InterfaceIsType"/>
+    <module name="VisibilityModifier"/>
+
+    <!-- Miscellaneous other checks.                   -->
+    <!-- See https://checkstyle.org/checks/misc/index.html -->
+    <module name="ArrayTypeStyle"/>
+    <module name="FinalParameters"/>
+    <module name="TodoComment"/>
+    <module name="UpperEll"/>
+
+    <!-- https://checkstyle.org/filters/suppressionxpathfilter.html -->
+    <module name="SuppressionXpathFilter">
+      <property name="file" value="${org.checkstyle.sun.suppressionxpathfilter.config}"
+                default="checkstyle-xpath-suppressions.xml" />
+      <property name="optional" value="true"/>
+    </module>
+
+  </module>
+
+</module>