NoSuchMethodError using JSONArray in org.json

Question

Error Message

java.lang.NoSuchMethodError: org.json.JSONArray.isEmpty()Z

My Scenario

I tried using the isEmpty() method of JSONArrayfrom the org.json JAR.

I'm using IntelliJ as my IDE. I'm not using anything close to reflection in my code. I declare a JSONArray, and after some lines trying to check if it is empty or not, however I get this Error when trying to use isEmpty().

I did work around the issue simply by using jsonArray.length() > 0, but the error message is what fascinates me. I looked into the de-compiled .class file of JSONArray, and the method isEmpty() exists, and has a public access modifier. Futhermore, InteliiJ is suggesting me I can use isEmpty() when typing the code. So what could be causing this error to occur?

Code Example

JSONArray filesJsonArray = new JSONArray();

JSONObject fileObject = new JSONObject();
fileObject.put("fileId",fileId);
fileObject.put("fileName",fileName);
fileObject.put("mimeType",mimeType);

filesJsonArray.put(fileObject);

if (!filesJsonArray.isEmpty()){ //the condition check here throws the error.
}

(Catch blocks were dismissed for brevity)

My Imports

In the class I'm using this code, this is all my imports

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.nio.ByteBuffer;
import java.sql.*;
import java.util.Base64;

Which package are you using? org.json.simple.JSONArray this has isEmpty() method. org.json.JSONArray this one does not have the method. — Prashant Zombade
– Prashant Zombade, Commented Jan 29, 2019 at 10:21
According to the documentation there is no isEmpty() method. Maybe you have an issue with IntelliJ, have you tried compiling from the command line? Maybe check File->Project structure to see that IntelliJ uses the right library — Joakim Danielson
– Joakim Danielson, Commented Jan 29, 2019 at 10:21
@DanielB., check with org.json.simple.JSONArray . You will have to handle JSONException while putting the objects. — Prashant Zombade
– Prashant Zombade, Commented Jan 29, 2019 at 10:28
@PrashantZombade There is a catch block for JSONException in my code. I'm not using org.json.simple.JSONArray, Im not familiar with this pacakge. — Daniel B.
– Daniel B., Commented Jan 29, 2019 at 10:51

curious · Accepted Answer · 2019-09-16 10:38:23Z

11

If you are using spring boot, then you can try this:

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.skyscreamer</groupId>
                <artifactId>jsonassert</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

It worked for me..

answered Sep 16, 2019 at 10:38

curious

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Comments

hanseltime · Accepted Answer · 2021-01-22 21:40:33Z

For anyone still looking at this, the main problem is with JSONAssert.

To confirm, use whatever dependency graph tool you have to verify that JSONAssert is adding "android-json".

Example for maven:

mvn dependency:tree

android-json provides its own implementations of org.json.* objects that aren't up to date. So exclude them as JSONAssert dependencies.

Example for maven:

<dependency>
   <groupId>org.skyscreamer</groupId>
   <artifactId>jsonassert</artifactId>
   <version>1.5.0</version>
   <scope>test</scope>
   <exclusions>
       <exclusion>
           <groupId>com.vaadin.external.google</groupId>
           <artifactId>android-json</artifactId>
       </exclusion>
   </exclusions>
</dependency>

That should save you from this problem while letting you use the great output of JSONAssert!

Gregzenegair · Accepted Answer · 2021-06-29 21:16:04Z

2

You need to clean the package of org.json dependency from spring-boot-starter-test artifactId, here is how to clean any depency (considering I was using spring-boot-starter-parent 2.4.4)

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.json</groupId>
                <artifactId>json</artifactId>
            </exclusion>
            <exclusion>
                <groupId>com.vaadin.external.google</groupId>
                <artifactId>android-json</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.skyscreamer</groupId>
                <artifactId>jsonassert</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

answered Jun 29, 2021 at 21:16

Gregzenegair

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1 Comment

Gregzenegair Over a year ago

And how to find these dependecies conflicts ? Type mvn dependency:tree into your root folder from a command line tool, it will give you the list of dependencies used, it can looks tedious, but this is the easiest way

Naya · Accepted Answer · 2019-01-29 10:25:28Z

0

I believe you added to your project

compile group: 'com.googlecode.json-simple', name: 'json-simple', version: '1.1'

Cause it seems like you've confused 2 classes: org.json.JSONArray with org.json.simple.JSONArray. First one doesn't have that method and the second one does. Here are code examples for both classes:

https://www.programcreek.com/java-api-examples/org.json.JSONArray

https://www.programcreek.com/java-api-examples/org.json.simple.JSONArray

So as a solution i’d recommend clean and rebuild the project.

answered Jan 29, 2019 at 10:25

Naya

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2 Comments

Daniel B. Over a year ago

This is not the case. I'm not using org.json.simple.JSONArray anywhere in my code. Just org.json.JSONArray

Naya Over a year ago

@DanielB. SO you say that cleaning and rebuilding the project doesn't work?

Alexey Simonov · Accepted Answer · 2019-03-19 13:53:28Z

I've got the same error after i added to my project:

<dependency>    
  <groupId>com.fasterxml.jackson.datatype</groupId>
  <artifactId>jackson-datatype-json-org</artifactId>
  <version>2.9.2</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.datatype</groupId>
  <artifactId>jackson-datatype-jsr310</artifactId>
  <version>2.9.2</version>
</dependency>

After that I cleaned and updated dependencies,

<dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20180813</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
            <version>2.9.7</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-json-org</artifactId>
            <version>2.9.7</version>
            <exclusions>
                <exclusion>
                    <groupId>org.json</groupId>
                    <artifactId>json</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

and it was gone.

Jeeka · Accepted Answer · 2023-10-17 19:45:04Z

I know this is old, but posting this in case this might be useful to someone.

Here is what my updated dependency

  <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-test</artifactId>
  <scope>test</scope>
  <exclusions>
    <exclusion>
      <groupId>org.json</groupId>
      <artifactId>json</artifactId>
    </exclusion>
    <exclusion>
      <groupId>com.vaadin.external.google</groupId>
      <artifactId>android-json</artifactId>
    </exclusion>
  </exclusions>
</dependency>

In my case, the JSONArray from com.vaadin.external.google from android-json was being used, instead of org.json.JSONArray which has the spliterator() throwing

Caused by: java.lang.NoSuchMethodError: org.json.JSONArray.spliterator()Ljava/util/Spliterator;

here is the code which threw that

  JSONArray someJsonArray = getSomeJsonArray();
  if (someJsonArray != null) {
    List<SecretEntry> secretEntries = (List)StreamSupport.stream(someJsonArray.spliterator(), false).map((obj) -> {
      return (JSONObject)obj;
...

And, I could not exclude org.skyscreamer.jsonassert, since it was being used by the assertJSONEqual() called by andExpect(content().json(getJsonBody()))

here is the code

 private MockMvc mockMvc;

 @Inject
 private WebApplicationContext webApplicationContext;

 mockMvc = webAppContextSetup(webApplicationContext).build();
 MvcResult result = mockMvc.perform(
        get("basePath").header(
            "headerName", "headerValue")).andExpect(content().contentType("application/json"))
    .andExpect(status().isOk()).andExpect(content().json(getJsonBody())).andReturn();

}

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