fix warnings

210/src/main/scala/io/circe/jackson/JacksonCompat.scala

@@ -29,9 +29,13 @@ private[jackson] trait JacksonCompat {
   protected def handleUnexpectedToken(context: DeserializationContext)(
     klass: Class[_],
     parser: JsonParser
-  ): Unit =
+  ): Unit = {
     context.handleUnexpectedToken(klass, parser)
+    ()
+  }
 
   protected def objectNodeSetAll(node: ObjectNode, fields: java.util.Map[String, JsonNode]): JsonNode =
     node.setAll[JsonNode](fields)
+
+  protected def currentName(jp: JsonParser): String = jp.currentName
 }

25/src/main/scala/io/circe/jackson/JacksonCompat.scala

@@ -15,4 +15,7 @@ private[jackson] trait JacksonCompat {
 
   protected def objectNodeSetAll(node: ObjectNode, fields: java.util.Map[String, JsonNode]): JsonNode =
     node.setAll(fields)
+
+  protected def currentName(jp: JsonParser): String = jp.getCurrentName
+
 }

27/src/main/scala/io/circe/jackson/JacksonCompat.scala

@@ -34,4 +34,7 @@ private[jackson] trait JacksonCompat {
 
   protected def objectNodeSetAll(node: ObjectNode, fields: java.util.Map[String, JsonNode]): JsonNode =
     node.setAll(fields)
+
+  protected def currentName(jp: JsonParser): String = jp.getCurrentName
+
 }

28/src/main/scala/io/circe/jackson/JacksonCompat.scala

@@ -29,9 +29,13 @@ private[jackson] trait JacksonCompat {
   protected def handleUnexpectedToken(context: DeserializationContext)(
     klass: Class[_],
     parser: JsonParser
-  ): Unit =
+  ): Unit = {
     context.handleUnexpectedToken(klass, parser)
+    ()
+  }
 
   protected def objectNodeSetAll(node: ObjectNode, fields: java.util.Map[String, JsonNode]): JsonNode =
     node.setAll(fields)
+
+  protected def currentName(jp: JsonParser): String = jp.getCurrentName
 }

build.sbt

@@ -24,6 +24,7 @@ val baseSettings = Seq(
   coverageEnabled := (if (scalaVersion.value.startsWith("3")) false else coverageEnabled.value),
   libraryDependencies ++= Seq(
     "io.circe" %% "circe-core" % circeVersion,
+    "org.scala-lang.modules" %% "scala-collection-compat" % "2.12.0",
     "io.circe" %% "circe-jawn" % circeVersion % Test,
     "io.circe" %% "circe-testing" % circeVersion % Test,
     "org.typelevel" %% "discipline-munit" % disciplineMunitVersion % Test,
@@ -109,7 +110,6 @@ lazy val jackson28 = project
       "-sourcepath",
       (LocalRootProject / baseDirectory).value.getAbsolutePath
     ),
-    git.remoteRepo := "[email protected]:circe/circe-jackson.git",
     autoAPIMappings := true,
     apiURL := Some(url("https://circe.github.io/circe-jackson/api/")),
     mimaPreviousArtifacts := Set("io.circe" %% "circe-jackson28" % previousCirceJacksonVersion)

shared/src/main/scala/io/circe/jackson/CirceJsonDeserializer.scala

@@ -25,9 +25,10 @@ import io.circe.Json
 import io.circe.JsonBigDecimal
 
 import java.util.ArrayList
+import scala.annotation.nowarn
 import scala.annotation.switch
 import scala.annotation.tailrec
-import scala.collection.JavaConverters._
+import scala.jdk.CollectionConverters._
 
 private[jackson] sealed trait DeserializerContext {
   def addValue(value: Json): DeserializerContext
@@ -51,7 +52,7 @@ private[jackson] final case class ReadingMap(content: ArrayList[(String, Json)])
     throw new Exception("Cannot add a value on an object without a key, malformed JSON object!")
 }
 
-private[jackson] final class CirceJsonDeserializer(factory: TypeFactory, klass: Class[_])
+private[jackson] final class CirceJsonDeserializer(@nowarn factory: TypeFactory, klass: Class[_])
     extends JsonDeserializer[Object]
     with JacksonCompat {
   override final def isCachable: Boolean = true
@@ -92,7 +93,7 @@ private[jackson] final class CirceJsonDeserializer(factory: TypeFactory, klass:
 
       case JsonTokenId.ID_FIELD_NAME =>
         parserContext match {
-          case (c: ReadingMap) :: stack => (None, c.setField(jp.getCurrentName) +: stack)
+          case (c: ReadingMap) :: stack => (None, c.setField(currentName(jp)) +: stack)
           case _ => throw new RuntimeException("We weren't reading an object, something went wrong")
         }
 
@@ -118,8 +119,11 @@ private[jackson] final class CirceJsonDeserializer(factory: TypeFactory, klass:
       case maybeValue =>
         jp.nextToken()
         val toPass = maybeValue.map { v =>
-          val previous :: stack = nextContext
-          (previous.addValue(v)) +: stack
+          nextContext match {
+            case previous :: stack =>
+              (previous.addValue(v)) +: stack
+            case Nil => nextContext
+          }
         }.getOrElse(nextContext)
 
         deserialize(jp, ctxt, toPass)

shared/src/main/scala/io/circe/jackson/package.scala

@@ -22,7 +22,7 @@ import com.fasterxml.jackson.databind.node._
 import java.io._
 import java.math.{ BigDecimal => JBigDecimal }
 import java.nio.ByteBuffer
-import scala.collection.JavaConverters._
+import scala.jdk.CollectionConverters._
 
 /**
  * Support for Jackson-powered parsing and printing for circe.
@@ -49,10 +49,6 @@ package object jackson extends WithJacksonMapper with JacksonParser with Jackson
     sw.toString
   }
 
-  private[this] class EnhancedByteArrayOutputStream extends ByteArrayOutputStream {
-    def toByteBuffer: ByteBuffer = ByteBuffer.wrap(this.buf, 0, this.size)
-  }
-
   final def jacksonPrintByteBuffer(json: Json): ByteBuffer = {
     val bytes = new EnhancedByteArrayOutputStream
     writeJson(new BufferedWriter(new OutputStreamWriter(bytes, "UTF-8")), json)
@@ -87,7 +83,7 @@ package object jackson extends WithJacksonMapper with JacksonParser with Jackson
             try {
               DecimalNode.valueOf(new JBigDecimal(x))
             } catch {
-              case nfe: NumberFormatException => TextNode.valueOf(x)
+              case _: NumberFormatException => TextNode.valueOf(x)
             }
         },
     TextNode.valueOf(_),
@@ -119,3 +115,9 @@ package object jackson extends WithJacksonMapper with JacksonParser with Jackson
   }
 
 }
+
+package jackson {
+  private[jackson] class EnhancedByteArrayOutputStream extends ByteArrayOutputStream {
+    def toByteBuffer: ByteBuffer = ByteBuffer.wrap(this.buf, 0, this.size)
+  }
+}