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java.lang.ClassCastException: api.Json cannot be cast to java.lang.String	at com.fasterxml.jackson.databind.ser.std.StringSerializer.serialize(StringSerializer.java:49)	at com.fasterxml.jackson.module.scala.ser.OptionSerializer.serialize(OptionSerializerModule.scala:145)	at com.fasterxml.jackson.module.scala.ser.OptionSerializer.serialize(OptionSerializerModule.scala:60)	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:672)	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:678)	at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:378)	at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:338)	at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:342)	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:686)	at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:157)	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:130)	at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1428)	at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:930)	at com.fasterxml.jackson.jaxrs.base.ProviderBase.writeTo(ProviderBase.java:635)	at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.invokeWriteTo(WriterInterceptorExecutor.java:265)	at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:250)	at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)	at org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:106)	at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)	at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:86)