Generate default constructor with JavaDoc for Xdoclint

src/main/java/org/openrewrite/java/template/processor/RefasterTemplateProcessor.java

@@ -177,12 +177,15 @@ public void visitClassDef(JCTree.JCClassDecl classDecl) {
 
                     StringBuilder recipe = new StringBuilder();
                     String refasterRuleClassName = classDecl.sym.fullname.toString().substring(classDecl.sym.packge().fullname.length() + 1);
-                    recipe.append("/**\n * OpenRewrite recipe created for Refaster template `").append(refasterRuleClassName).append("`.\n */\n");
+                    recipe.append("/**\n * OpenRewrite recipe created for Refaster template {@code ").append(refasterRuleClassName).append("}.\n */\n");
                     String recipeName = templateFqn.substring(templateFqn.lastIndexOf('.') + 1);
                     recipe.append("@NonNullApi\n");
                     recipe.append(descriptor.classDecl.sym.outermostClass() == descriptor.classDecl.sym ?
-                            "public class " : "public static class ").append(recipeName).append(" extends Recipe {\n");
-                    recipe.append("\n");
+                            "public class " : "public static class ").append(recipeName).append(" extends Recipe {\n\n");
+                    recipe.append("    /**\n");
+                    recipe.append("     * Instantiates a new instance.\n");
+                    recipe.append("     */\n");
+                    recipe.append("    public ").append(recipeName).append("() {}\n\n");
                     recipe.append(recipeDescriptor(classDecl,
                             "Refaster template `" + refasterRuleClassName + '`',
                             "Recipe created for the following Refaster template:\\n```java\\n" + escape(templateCode) + "\\n```\\n."
@@ -335,9 +338,13 @@ public void visitClassDef(JCTree.JCClassDecl classDecl) {
                             }
 
                             if (outerClassRequired) {
-                                out.write("/**\n * OpenRewrite recipes created for Refaster template `" + inputOuterFQN + "`.\n */\n");
+                                out.write("/**\n * OpenRewrite recipes created for Refaster template {@code " + inputOuterFQN + "}.\n */\n");
                                 String outerClassName = className.substring(className.lastIndexOf('.') + 1);
                                 out.write("public class " + outerClassName + " extends Recipe {\n");
+                                out.write("    /**\n");
+                                out.write("     * Instantiates a new instance.\n");
+                                out.write("     */\n");
+                                out.write("    public " + outerClassName + "() {}\n\n");
                                 out.write(recipeDescriptor(classDecl,
                                         String.format("`%s` Refaster recipes", inputOuterFQN.substring(inputOuterFQN.lastIndexOf('.') + 1)),
                                         String.format("Refaster template recipes for `%s`.", inputOuterFQN)));

src/main/java/org/openrewrite/java/template/processor/TemplateProcessor.java

@@ -215,9 +215,17 @@ public void visitIdent(JCTree.JCIdent ident) {
                                 }
 
                                 out.write("\n");
-                                out.write("/**\n * OpenRewrite `" + templateName.getValue() + "` template created for  `" + templateFqn.split("_")[0] + "`.\n */\n");
-                                out.write("public class " + templateFqn.substring(templateFqn.lastIndexOf('.') + 1) + " {\n");
-                                out.write("    /**\n     * @return `JavaTemplate` to match or replace.\n     */\n");
+                                out.write("/**\n * OpenRewrite `" + templateName.getValue() + "` template created for {@code " + templateFqn.split("_")[0] + "}.\n */\n");
+                                String templateClassName = templateFqn.substring(templateFqn.lastIndexOf('.') + 1);
+                                out.write("public class " + templateClassName + " {\n");
+                                out.write("    /**\n");
+                                out.write("     * Instantiates a new instance.\n");
+                                out.write("     */\n");
+                                out.write("    public " + templateClassName + "() {}\n\n");
+                                out.write("    /**\n");
+                                out.write("     * Get the {@code JavaTemplate.Builder} to match or replace.\n");
+                                out.write("     * @return the JavaTemplate builder.\n");
+                                out.write("     */\n");
                                 out.write("    public static JavaTemplate.Builder getTemplate() {\n");
                                 out.write("        return JavaTemplate\n");
                                 out.write("                .builder(\"" + templateSource + "\")");

src/test/resources/refaster/EscapesRecipes.java

@@ -37,6 +37,8 @@
 import com.sun.tools.javac.util.Constants;
 
 public class EscapesRecipes extends Recipe {
+    public EscapesRecipes() {}
+
     @Override
     public String getDisplayName() {
         return "`Escapes` Refaster recipes";
@@ -57,6 +59,7 @@ public List<Recipe> getRecipeList() {
 
     @NonNullApi
     public static class ConstantsFormatRecipe extends Recipe {
+        public ConstantsFormatRecipe() {}
 
         @Override
         public String getDisplayName() {
@@ -103,6 +106,7 @@ public J visitMethodInvocation(J.MethodInvocation elem, ExecutionContext ctx) {
 
     @NonNullApi
     public static class SplitRecipe extends Recipe {
+        public SplitRecipe() {}
 
         @Override
         public String getDisplayName() {

src/test/resources/refaster/MatchingRecipes.java

@@ -35,6 +35,9 @@
 
 
 public class MatchingRecipes extends Recipe {
+
+    public MatchingRecipes() {}
+
     @Override
     public String getDisplayName() {
         return "Static analysis";
@@ -60,6 +63,8 @@ public List<Recipe> getRecipeList() {
     @NonNullApi
     public static class StringIsEmptyRecipe extends Recipe {
 
+        public StringIsEmptyRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Use String length comparison";

src/test/resources/refaster/MethodThrowsRecipe.java

@@ -40,6 +40,8 @@
 @NonNullApi
 public class MethodThrowsRecipe extends Recipe {
 
+    public MethodThrowsRecipe() {}
+
     @Override
     public String getDisplayName() {
         return "Refaster template `MethodThrows`";

src/test/resources/refaster/MultipleDereferencesRecipes.java

@@ -37,6 +37,9 @@
 import java.nio.file.Path;
 
 public class MultipleDereferencesRecipes extends Recipe {
+
+    public MultipleDereferencesRecipes() {}
+
     @Override
     public String getDisplayName() {
         return "`MultipleDereferences` Refaster recipes";
@@ -59,6 +62,8 @@ public List<Recipe> getRecipeList() {
     @NonNullApi
     public static class VoidTypeRecipe extends Recipe {
 
+        public VoidTypeRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Refaster template `MultipleDereferences.VoidType`";
@@ -104,6 +109,8 @@ public J visitMethodInvocation(J.MethodInvocation elem, ExecutionContext ctx) {
     @NonNullApi
     public static class StringIsEmptyRecipe extends Recipe {
 
+        public StringIsEmptyRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Refaster template `MultipleDereferences.StringIsEmpty`";
@@ -145,6 +152,8 @@ public J visitMethodInvocation(J.MethodInvocation elem, ExecutionContext ctx) {
     @NonNullApi
     public static class EqualsItselfRecipe extends Recipe {
 
+        public EqualsItselfRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Refaster template `MultipleDereferences.EqualsItself`";

src/test/resources/refaster/NestedPreconditionsRecipe.java

@@ -41,6 +41,8 @@
 @NonNullApi
 public class NestedPreconditionsRecipe extends Recipe {
 
+    public NestedPreconditionsRecipe() {}
+
     @Override
     public String getDisplayName() {
         return "Refaster template `NestedPreconditions`";

src/test/resources/refaster/ParameterReuseRecipe.java

@@ -37,6 +37,8 @@
 @NonNullApi
 public class ParameterReuseRecipe extends Recipe {
 
+    public ParameterReuseRecipe() {}
+
     @Override
     public String getDisplayName() {
         return "Refaster template `ParameterReuse`";

src/test/resources/refaster/ShouldAddImportsRecipes.java

@@ -38,6 +38,9 @@
 import static java.util.Objects.hash;
 
 public class ShouldAddImportsRecipes extends Recipe {
+
+    public ShouldAddImportsRecipes() {}
+
     @Override
     public String getDisplayName() {
         return "`ShouldAddImports` Refaster recipes";
@@ -60,6 +63,8 @@ public List<Recipe> getRecipeList() {
     @NonNullApi
     public static class StringValueOfRecipe extends Recipe {
 
+        public StringValueOfRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Refaster template `ShouldAddImports.StringValueOf`";
@@ -101,6 +106,8 @@ public J visitMethodInvocation(J.MethodInvocation elem, ExecutionContext ctx) {
     @NonNullApi
     public static class ObjectsEqualsRecipe extends Recipe {
 
+        public ObjectsEqualsRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Refaster template `ShouldAddImports.ObjectsEquals`";
@@ -158,6 +165,8 @@ public J visitMethodInvocation(J.MethodInvocation elem, ExecutionContext ctx) {
     @NonNullApi
     public static class StaticImportObjectsHashRecipe extends Recipe {
 
+        public StaticImportObjectsHashRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Refaster template `ShouldAddImports.StaticImportObjectsHash`";

src/test/resources/refaster/ShouldSupportNestedClassesRecipes.java

@@ -35,6 +35,9 @@
 
 
 public class ShouldSupportNestedClassesRecipes extends Recipe {
+
+    public ShouldSupportNestedClassesRecipes() {}
+
     @Override
     public String getDisplayName() {
         return "`ShouldSupportNestedClasses` Refaster recipes";
@@ -56,6 +59,8 @@ public List<Recipe> getRecipeList() {
     @NonNullApi
     public static class NestedClassRecipe extends Recipe {
 
+        public NestedClassRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Refaster template `ShouldSupportNestedClasses.NestedClass`";
@@ -97,6 +102,8 @@ public J visitBinary(J.Binary elem, ExecutionContext ctx) {
     @NonNullApi
     public static class AnotherClassRecipe extends Recipe {
 
+        public AnotherClassRecipe() {}
+
         @Override
         public String getDisplayName() {
             return "Refaster template `ShouldSupportNestedClasses.AnotherClass`";

src/test/resources/refaster/SimplifyBooleansRecipe.java

@@ -37,6 +37,8 @@
 @NonNullApi
 public class SimplifyBooleansRecipe extends Recipe {
 
+    public SimplifyBooleansRecipe() {}
+
     @Override
     public String getDisplayName() {
         return "Refaster template `SimplifyBooleans`";

src/test/resources/refaster/UseStringIsEmptyRecipe.java

@@ -40,6 +40,8 @@
 @NonNullApi
 public class UseStringIsEmptyRecipe extends Recipe {
 
+    public UseStringIsEmptyRecipe() {}
+
     @Override
     public String getDisplayName() {
         return "Replace `s.length() > 0` with `!s.isEmpty()`";

src/test/resources/template/ParameterReuseRecipe$1_before.java

@@ -17,6 +17,8 @@
 import org.openrewrite.java.*;
 
 public class ParameterReuseRecipe$1_before {
+    public ParameterReuseRecipe$1_before() {}
+
     public static JavaTemplate.Builder getTemplate() {
         return JavaTemplate
                 .builder("#{s:any(java.lang.String)}.equals(#{s})");

src/test/resources/template/ShouldAddClasspathRecipe$FullyQualifiedRecipe$1_after.java

@@ -17,6 +17,8 @@
 import org.openrewrite.java.*;
 
 public class ShouldAddClasspathRecipes$FullyQualifiedRecipe$1_after {
+    public ShouldAddClasspathRecipes$FullyQualifiedRecipe$1_after() {}
+
     public static JavaTemplate.Builder getTemplate() {
         return JavaTemplate
                 .builder("org.slf4j.LoggerFactory.getLogger(#{message:any(java.lang.String)})")

src/test/resources/template/ShouldAddClasspathRecipe$FullyQualifiedRecipe$1_before.java

@@ -17,6 +17,8 @@
 import org.openrewrite.java.*;
 
 public class ShouldAddClasspathRecipes$FullyQualifiedRecipe$1_before {
+    public ShouldAddClasspathRecipes$FullyQualifiedRecipe$1_before() {}
+
     public static JavaTemplate.Builder getTemplate() {
         return JavaTemplate
                 .builder("System.out.println(#{message:any(java.lang.String)})");

src/test/resources/template/ShouldAddClasspathRecipe$PrimitiveRecipe$1_after.java

@@ -17,6 +17,8 @@
 import org.openrewrite.java.*;
 
 public class ShouldAddClasspathRecipes$PrimitiveRecipe$1_after {
+    public ShouldAddClasspathRecipes$PrimitiveRecipe$1_after() {}
+
     public static JavaTemplate.Builder getTemplate() {
         return JavaTemplate
                 .builder("System.out.print(#{i:any(int)})");

src/test/resources/template/ShouldAddClasspathRecipe$PrimitiveRecipe$1_before.java

@@ -17,6 +17,8 @@
 import org.openrewrite.java.*;
 
 public class ShouldAddClasspathRecipes$PrimitiveRecipe$1_before {
+    public ShouldAddClasspathRecipes$PrimitiveRecipe$1_before() {}
+
     public static JavaTemplate.Builder getTemplate() {
         return JavaTemplate
                 .builder("System.out.println(#{i:any(int)})");

src/test/resources/template/ShouldAddClasspathRecipe$UnqualifiedRecipe$1_after.java

@@ -17,6 +17,8 @@
 import org.openrewrite.java.*;
 
 public class ShouldAddClasspathRecipes$UnqualifiedRecipe$1_after {
+    public ShouldAddClasspathRecipes$UnqualifiedRecipe$1_after() {}
+
     public static JavaTemplate.Builder getTemplate() {
         return JavaTemplate
                 .builder("org.slf4j.LoggerFactory.getLogger(#{message:any(java.lang.String)})")

src/test/resources/template/ShouldAddClasspathRecipe$UnqualifiedRecipe$1_before.java

@@ -17,6 +17,8 @@
 import org.openrewrite.java.*;
 
 public class ShouldAddClasspathRecipes$UnqualifiedRecipe$1_before {
+    public ShouldAddClasspathRecipes$UnqualifiedRecipe$1_before() {}
+
     public static JavaTemplate.Builder getTemplate() {
         return JavaTemplate
                 .builder("System.out.println(#{message:any(java.lang.String)})");