无法使用genson序列化scala类

我遇到了一个问题，我无法让toJson与Scala类一起工作。它输出一个空的json字符串。：{}无法使用genson序列化scala类

这些类的成员变量已填充。我尝试了一个自定义的genson类和默认的genson类。两者产生相同的输出。虽然案例类工作正常。

我做错了什么？代码和输出下面

我看起来像这样的一些类：

package gensontest 
    import com.owlike.genson.annotation.JsonProperty 
    class Person (@JsonProperty("name") var name:String ,@JsonProperty("age") var age:Int,@JsonProperty("address") var address: Address) extends Serializable{ 

    } 

    package gensontest 

    import com.owlike.genson.annotation.JsonProperty 

    class Address (@JsonProperty("building") var building:Int, @JsonProperty("city") var city:String) extends Serializable{ 

    } 

package gensontest 

import com.owlike.genson._ 
import com.owlike.genson.ext.json4s._ 
import org.json4s._ 
import org.json4s.JsonDSL._ 
import org.json4s.JsonAST._ 

object CustomGenson { 
    val customGenson = new ScalaGenson(
     new GensonBuilder().useConstructorWithArguments(true).withBundle(ScalaBundle(),Json4SBundle()).create() 
    ) 


}

然后在收容有对象的main（）

package gensontest 
import CustomGenson.customGenson._ 
//import com.owlike.genson.defaultGenson._ 
import org.json4s._ 
/** 
* Hello world! 
* 
*/ 
object App{ 
    def main(args: Array[String]) : Unit = { 
    case class Addresscc(street: String, building: Int) 
    case class Personcc(name: String, age: Int, address: Option[Address1]) 
    case class Usercc(uId: Int) 

    var someAddr = new Address(157,"Paris") 
    var someone:Person = new Person("Eugen",28,someAddr) 
    val json = toJson(Personcc("foo bar", 28, Some(Addresscc("rue des lapins", 1337)))) 
    val userInstance = new User(2) 
    val userInstance1 = new Usercc(2) 

    //check if Person's members are public 
    println(someone.name) 
    println(someone.age) 
    println(someone.address.building) 
    println(someone.address.city) 
    val personS = toJson(someone) 
    val addressS = toJson(someAddr) 
    val userInstanceS = toJson(userInstance) 
    val userInstanceSCC = toJson(userInstance1) 

    println(personS) 
    println(addressS) 
    println(userInstanceS) 
    println(json) 
    println(userInstanceSCC) 
    var p1:Person1 = fromJson[Person1](json) 
    var p:Person = fromJson[Person](personS) 
    } 
}

输出是：

/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/bin/java "-javaagent:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar=64224:/Applications/IntelliJ IDEA CE.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/lib/tools.jar:/Users/kartiku/IdeaProjects/gensontestscala1/target/classes:/Users/kartiku/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.11.8.jar:/Users/kartiku/.ivy2/cache/org.scala-lang/scala-reflect/jars/scala-reflect-2.11.8.jar:/Users/kartiku/.ivy2/cache/org.scala-lang/scala-library/srcs/scala-library-2.11.8-sources.jar:/Users/kartiku/.ivy2/cache/org.scala-lang/scala-reflect/srcs/scala-reflect-2.11.8-sources.jar:/Users/kartiku/.m2/repository/org/scala-lang/scala-library/2.11.8/scala-library-2.11.8.jar:/Users/kartiku/.m2/repository/org/json4s/json4s-core_2.11/3.5.0/json4s-core_2.11-3.5.0.jar:/Users/kartiku/.m2/repository/org/json4s/json4s-ast_2.11/3.5.0/json4s-ast_2.11-3.5.0.jar:/Users/kartiku/.m2/repository/org/json4s/json4s-scalap_2.11/3.5.0/json4s-scalap_2.11-3.5.0.jar:/Users/kartiku/.m2/repository/com/thoughtworks/paranamer/paranamer/2.8/paranamer-2.8.jar:/Users/kartiku/.m2/repository/org/scala-lang/modules/scala-xml_2.11/1.0.6/scala-xml_2.11-1.0.6.jar:/Users/kartiku/.m2/repository/com/owlike/genson-scala_2.11/1.4/genson-scala_2.11-1.4.jar:/Users/kartiku/.m2/repository/com/owlike/genson/1.4/genson-1.4.jar:/Users/kartiku/.m2/repository/org/scala-lang/scala-reflect/2.11.0/scala-reflect-2.11.0.jar gensontest.App 
objc[54099]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined. 
Eugen 
28 
157 
Paris 
{} 
{} 
{} 
{"address":{"building":1337,"street":"rue des lapins"},"age":28,"name":"foo bar"} 
{"uId":2} 

Process finished with exit code 0

来源

2017-10-13 K_U

不确定你是否发布了所有的实际代码，但是使用最新版本，它对我来说工作得很好（n注意你不需要这里需要JsonProperty注解）。

import com.owlike.genson._ 
import com.owlike.genson.annotation.JsonProperty 

class Pers(var f: Int, @JsonProperty("b") var b: Int) 

object Test extends App { 
    val genson = new ScalaGenson(new GensonBuilder().withBundle(ScalaBundle()).create()) 
    println(genson.toJson(new Pers(1, 2))) 
}

尝试运行上面的示例。

来源

2017-10-14 01:45:40 eugen

无法使用genson序列化scala类

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