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classcastexception: java.util.linkedhashmap cannot be cast Gson on custom android roms


classcastexception: java.util.linkedhashmap cannot be cast Gson on custom android roms

By : Mike
Date : November 21 2020, 07:31 AM
hop of those help? Well, instead of using Vector I changed every vector i need to store on gson to ArrayList this solved my problem on whole of the devices have no idea why but it works
code :


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java.lang.ClassCastException: Cannot cast java.util.LinkedHashMap to Specific class

java.lang.ClassCastException: Cannot cast java.util.LinkedHashMap to Specific class


By : Kushal Rusia
Date : March 29 2020, 07:55 AM
wish helps you I want to have common method for inserting and getting objects from MongoDB collection. For all mongo db operations I am using Jongo library. Here's my code: , If you only need to map documents to UserModel objects
code :
collection.findOne("{name:'John'}").as(UserModel.class);
public <T> T get(String query, Class<T> clazz) {
  return collection.findOne(query).as(clazz);
}
...
UserModel user = this.get("{name:'John'}", UserModel.class);
java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast

java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast


By : Rodrigo Vitor
Date : March 29 2020, 07:55 AM
wish of those help In older versions of Spring, Spring couldn't (or rather wouldn't) determine that
code :
@RequestBody List<OrderDetails> od
public class OrderDetailsList extends ArrayList<OrderDetails> {}
@RequestBody OrderDetailsList od
java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.testing.models.Account

java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.testing.models.Account


By : aizen
Date : March 29 2020, 07:55 AM
will help you The issue's coming from Jackson. When it doesn't have enough information on what class to deserialize to, it uses LinkedHashMap.
Since you're not informing Jackson of the element type of your ArrayList, it doesn't know that you want to deserialize into an ArrayList of Accounts. So it falls back to the default.
code :
ObjectMapper mapper = new ObjectMapper();

JsonNode accounts = given().when().expect().statusCode(expectedResponseCode)
    .get("accounts/" + newClub.getOwner().getCustId() + "/clubs")
    .as(JsonNode.class);


//Jackson's use of generics here are completely unsafe, but that's another issue
List<Account> accountList = mapper.convertValue(
    accounts, 
    new TypeReference<List<Account>>(){}
);

assertThat(accountList.get(0).getId()).isEqualTo(expectedId);
SDN4: java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to [EntityNode]

SDN4: java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to [EntityNode]


By : Ayomide Aregbede
Date : March 29 2020, 07:55 AM
this one helps. Mapping to entities in a @QueryResult and @ResultColumn is not yet supported in SDN 4. You'll need to return the ID of the Item instead and load it using the repository, session or template. An example of query results can be found here:
Repository: https://github.com/spring-projects/spring-data-neo4j/blob/4.0.x/spring-data-neo4j/src/test/java/org/springframework/data/neo4j/examples/movies/repo/UserRepository.java
java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to java.util.LinkedHashMap

java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to java.util.LinkedHashMap


By : Olivier Collin
Date : March 29 2020, 07:55 AM
hope this fix your issue Reposting the solution as an answer.
It is not recommended to cast to concrete classes if you do not use their specific features. In this case, it is better to cast to Map instead of LinkedHashMap. Gson's LinkedTreeMap is a Map too, so no problem should arise.
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