You are missing json-simple-1.1.1.jar from your classpath.
if you are using Maven, add below into your pom.xml.
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
Or you can download it from here.
Answer from Sundararaj Govindasamy on Stack OverflowYou are missing json-simple-1.1.1.jar from your classpath.
if you are using Maven, add below into your pom.xml.
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
Or you can download it from here.
Firstly, you don't need the json-simple.jar in your project.
Therefore remove the import org.json.simple.*
Secondly, the best practice is to import only the required classes from your jar.Therefore you can replace import org.json.*; by
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONString;
java - The type of the expression must be an array type but it resolved to JSONArray - Stack Overflow
import org.json.simple.JSONArray; how do I resolve this error? (java newbie)
java - org.json.simple cannot be resolved - Stack Overflow
Cannot deserialize the current JSON array.
I have tried downloading this and adding it to my project on eclipse as an external file yet an error keeps showing up?
http://www.java2s.com/Code/Jar/j/Downloadjavajsonjar.htm
Probably your simple json.jar file isn't in your classpath.
I was facing same issue in my Spring Integration project. I added below JSON dependencies in pom.xml file. It works for me.
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20090211</version>
</dependency>
A list of versions can be found here: https://mvnrepository.com/artifact/org.json/json
You did not share the most import bits of the code. I'm guessing the type T passed to the generic method is a single type while the response is an array.
@AgaveJoe is right, based on image posted you have a Json Array.
You have to Deserialize into an Array or List.
Excetion message is telling you what should be done
To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.
Packageless classes are invisible for classes inside a package. Since JSP's are compiled into a class in a servletcontainer-specific package, the packageless JSONCore class is invisible for the JSP.
Put the JSONCore class in a package and use either the full qualified class name to declare and instantiate it, or use the @page import statement.
That said, the JSP is the wrong place for the job. You should be using (indirectly) a Servlet class for the job. See also How to avoid Java code in JSP files.
You need to use JSP import directive to let Java know where to get the implementation of your class from. JSP get translated to java and therefore follow the same rules as regular Java code.
I thought this was something that came with java and an external jar is not needed
No - JsonObject is only in JavaEE. JSONObject isn't included in JavaSE, it needs an external library. You can find it on github. However, if you use JavaEE, it is included.
If you are using gradle, add the following to your build.gradle file (available in maven central):
dependencies {
compile "org.json:json:20171018"
}
You need to use the following library in Java SE: https://jsonp.java.net/
The JSR 353: Java API for JSON Processing is only in Java EE by default, not in Java SE.
I'm going to start by saying I'm a complete novice in Java. I've started computer science recently and I've got a project where I have to create a project to represent a server using sockets. The server will has to function as a control a library's book record/register. My professor provided a .json file with the book lists which I have to use.
I tried creating the project on VS Code, but after following these steps:
Downloaded the library from the Maven Repository.
Created a lib folder in your project's root directory and move the json-20230303.jar file to this folder.
My code couldn't import the library and this error appeared every time I tried to use the library:
"src\Gerenciador.java:2: error: package org.json does not exist import org.json.JSONArray;"
After a while I thought it would be easier to import the library on the Ide Eclipse, but after creating the project and adding it via the Build Path option, it still didn't work. Even though the library appeared in the Libraries section in the Java Build Path.
This error: "The type org.json.JSONObject is not accessible" keeps appearing.
I don't know how to fix the problem. I think I'm calling on the library wrong, but I don't know how I should do it. If there is any information missing, let me know and I'll provide it, it's my first time asking for help on a programming forum.