Skipping over groovy metadata class + groovy test.

jr-objects/pom.xml

@@ -40,6 +40,12 @@ has no other dependencies, and provides additional builder-style content generat
  <artifactId>jackson-core</artifactId>
  <version>${jackson.version.core}</version>
  </dependency>
+ <dependency>
+ <groupId>org.codehaus.groovy</groupId>
+ <artifactId>groovy</artifactId>
+ <version>3.0.18</version>
+ <scope>test</scope>
+ </dependency>
  </dependencies>
 
  <build>
@@ -64,9 +70,6 @@ has no other dependencies, and provides additional builder-style content generat
  <goal>replace</goal>
  </goals>
  <phase>generate-sources</phase>
-<!--
- <phase>process-sources</phase>
--->
  </execution>
  </executions>
  <configuration>

jr-objects/src/main/java/com/fasterxml/jackson/jr/ob/impl/BeanPropertyIntrospector.java

@@ -88,7 +88,7 @@ private POJODefinition _construct(Class<?> beanType, int features)
  private static void _introspect(Class<?> currType, Map<String, PropBuilder> props,
  int features)
  {
- if (currType == null || currType == Object.class) {
+ if (currType == null || currType == Object.class || isGroovyMetaClass(currType)) {
  return;
  }
  // First, check base type
@@ -117,7 +117,7 @@ private static void _introspect(Class<?> currType, Map<String, PropBuilder> prop
  // 13-Jun-2015, tatu: Skip synthetic, bridge methods altogether, for now
  // at least (add more complex handling only if absolutely necessary)
  if (Modifier.isStatic(flags)
- || m.isSynthetic() || m.isBridge()) {
+ || m.isSynthetic() || m.isBridge() || isGroovyMetaClass(m.getReturnType())) {
  continue;
  }
  Class<?> argTypes[] = m.getParameterTypes();
@@ -158,12 +158,7 @@ private static void _introspect(Class<?> currType, Map<String, PropBuilder> prop
  }
 
  private static PropBuilder _propFrom(Map<String,PropBuilder> props, String name) {
- PropBuilder prop = props.get(name);
- if (prop == null) {
- prop = Prop.builder(name);
- props.put(name, prop);
- }
- return prop;
+ return props.computeIfAbsent(name, Prop::builder);
  }
 
  private static String decap(String name) {
@@ -182,4 +177,13 @@ private static String decap(String name) {
  return name;
  }
 
+ /**
+ * Another helper method to deal with Groovy's problematic metadata accessors
+ *
+ * @implNote Groovy MetaClass have cyclic reference, and hence the class containing it should not be serialised without
+ * either removing that reference, or skipping over such references.
+ */
+ protected static boolean isGroovyMetaClass(Class<?> clazz) {
+ return clazz.getName().startsWith("groovy.lang");
+ }
 }

jr-objects/src/test/java/com/fasterxml/jackson/jr/GroovyTest.groovy

@@ -0,0 +1,58 @@
+package com.fasterxml.jackson.jr
+
+import com.fasterxml.jackson.jr.ob.JSON
+import com.fasterxml.jackson.jr.ob.TestBase
+
+class GroovyTest extends TestBase {
+
+ void testSimpleObject() throws Exception {
+ var data = JSON.std.asString(new MyClass())
+ var expected = """{"AAAAA_A_Field_Starting_With_Two_Capital_Letters":"XYZ","aDouble":0.0,"aPublicInitializedInteger":56,"aPublicInitializedIntegerObject":1516,"aPublicUninitializedInteger":0,"anInitializedIntegerObject":1112,"anInitializedPublicString":"stringData","anInitializedString":"ABC","anInteger":0,"anIntegerWithValue":12}"""
+ assertEquals(data, expected)
+ }
+
+ private class MyClass {
+ int anInteger
+ int anIntegerWithValue = 12
+
+ static int anStaticInteger = 34
+ static int anStaticIntegerWithValue = 34
+
+ public int aPublicUninitializedInteger
+ public int aPublicInitializedInteger = 56
+
+ private int aPrivateUninitializedInteger
+ private int aPrivateInitializedInteger = 78
+
+ public static int aPublicStaticUninitializedInteger
+ public static int aPublicStaticInitializedInteger = 910
+
+ Integer anIntegerObject
+ Integer anInitializedIntegerObject = 1112
+
+ static Integer aStaticIntegerObject
+ static Integer aStaticInitializedIntegerObject = 1314
+
+ public Integer aPublicUninitializedIntegerObject
+ public Integer aPublicInitializedIntegerObject = 1516
+
+ public static Integer aPublicStaticUninitializedIntegerObject
+ public static Integer aPublicStaticInitializedIntegerObject = 1718
+
+ String aString
+ String anInitializedString = "ABC"
+
+ static String aStaticString = "jacksonJR"
+
+ public String aPublicString
+ public String anInitializedPublicString = "stringData"
+
+ public String AAAAA_A_Field_Starting_With_Two_Capital_Letters = "XYZ"
+ //Other Items
+ public static String staticStr = "jacksonJR" // Public Static Object
+ static int anStaticInt // Uninitialized Static Object
+ public double aDouble // uninitialized primitive
+ public Double aDoubleObject // testing boxing object
+ private int hiddenvalue = 123 // private value
+ }
+}