Fix code smell and avoid cycle in exception use

crd-generator/cli/src/main/java/io/fabric8/crd/generator/cli/CRDGeneratorCLI.java

@@ -314,24 +314,4 @@ static CommandLine createCommandLine(CRDGeneratorCLI crdGeneratorCLI) {
         .setExecutionExceptionHandler(new CRDGeneratorExecutionExceptionHandler(crdGeneratorCLI));
   }
 
-  /**
-   * Exception to indicate that no custom resource classes
-   * have been retained after scanning and filtering.
-   */
-  static class CustomResourceClassNotFoundException extends CRDGeneratorCliException {
-    CustomResourceClassNotFoundException() {
-      super("No Custom Resource class retained after filtering");
-    }
-  }
-
-  private static class CRDGeneratorCliException extends RuntimeException {
-    CRDGeneratorCliException(String message) {
-      super(message);
-    }
-
-    CRDGeneratorCliException(String message, Throwable cause) {
-      super(message, cause);
-    }
-  }
-
 }

crd-generator/cli/src/main/java/io/fabric8/crd/generator/cli/CRDGeneratorCliException.java

@@ -0,0 +1,11 @@
+package io.fabric8.crd.generator.cli;
+
+class CRDGeneratorCliException extends RuntimeException {
+  CRDGeneratorCliException(String message) {
+    super(message);
+  }
+
+  CRDGeneratorCliException(String message, Throwable cause) {
+    super(message, cause);
+  }
+}

crd-generator/cli/src/main/java/io/fabric8/crd/generator/cli/CRDGeneratorExecutionExceptionHandler.java

@@ -48,7 +48,7 @@ public int handleExecutionException(
       return CRDGeneratorExitCode.CR_CLASS_LOADING;
     }
 
-    if (ex instanceof CRDGeneratorCLI.CustomResourceClassNotFoundException) {
+    if (ex instanceof CustomResourceClassNotFoundException) {
       commandLine.getErr().println();
       commandLine.getErr().println("Check JAR files and directories considered to be scanned " +
           "as well as your filters. At least one Custom Resource class " +

crd-generator/cli/src/main/java/io/fabric8/crd/generator/cli/CustomResourceClassNotFoundException.java

@@ -0,0 +1,11 @@
+package io.fabric8.crd.generator.cli;
+
+/**
+ * Exception to indicate that no custom resource classes have been retained after scanning and
+ * filtering.
+ */
+class CustomResourceClassNotFoundException extends CRDGeneratorCliException {
+  CustomResourceClassNotFoundException() {
+    super("No Custom Resource class retained after filtering");
+  }
+}