Parse JSON string in Java

Question

I'm trying to parse a JSON string in Java but I cant figure out how! I'm using lib-JSON right now:

import net.sf.json.*;

.

String jsonStr = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}";
JSONObject jsonObj = (JSONObject) JSONSerializer.toJSON(jsonStr); // this line crashes

I get no compilation errors but when i run the program it says:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at ircbot.plugins.SiteTitle.<init>(SiteTitle.java:28)
    at ircbot.Main.main(Main.java:10)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    ... 14 more
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

It sounds like I'm missing some dependencies, but I don't know how to find out if or which!

Thanks in advance!

gprathour · Accepted Answer · 2011-12-02 09:14:40Z

2

It seems you have not imported need jar file for class "org.apache.commons.lang.exception.NestableRuntimeException"

There are many classes that we use in our Java program and which don't come with Java. So we need to put Suitable Jar file for them.

answered Dec 2, 2011 at 9:14

gprathour

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3 Comments

oskob Over a year ago

But I do have the apache commons lib! But now when I look inside it there is no subpackage lang.exception... I do find org.apache.commons.lang3, but still no exceptions!

gprathour Over a year ago

@oskob try this link, if you search then will see this jar file contains the class you are looking for. java2s.com/Code/Jar/ABC/Downloadcommonslang24jar.htm

oskob Over a year ago

That link looks broken :P however, it seems i used the wrong version, i tried 2.x instead of 3.x and it worked!

Liviu T. · Accepted Answer · 2011-12-02 09:18:31Z

2

I recomend grepcode Just enter the class name and you get a list of the known versions of jars

Example: here

answered Dec 2, 2011 at 9:18

Liviu T.

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Community · Accepted Answer · 2017-05-23 12:11:58Z

1

You are missing jar file. No jar file in your class path.

see this Reading JSON file error

edited May 23, 2017 at 12:11

CommunityBot

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answered Dec 2, 2011 at 9:21

subodh

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Comments

Viruzzo · Accepted Answer · 2011-12-02 09:14:34Z

0

org/apache/commons/lang -> http://commons.apache.org/lang/ Basically, use Google and get the respective jar.

answered Dec 2, 2011 at 9:14

Viruzzo

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Selvakumar Ponnusamy · Accepted Answer · 2011-12-02 09:16:34Z

0

Your JSON String also not valid, This the valid JSON,

{"string": "JSON","integer": "1","double": "2.0","boolean": "true" }

answered Dec 2, 2011 at 9:16

Selvakumar Ponnusamy

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Rifat · Accepted Answer · 2011-12-02 09:26:12Z

0

These are the dependencies -

jakarta commons-lang 2.5
jakarta commons-beanutils 1.8.0
jakarta commons-collections 3.2.1
jakarta commons-logging 1.1.1
ezmorph 1.0.6

are you sure you added all of them in your classpath.

answered Dec 2, 2011 at 9:26

Rifat

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2 Comments

oskob Over a year ago

Is there an easy way to find these dependencies? It seems like a lot of libs for just JSON parsing :S

Rifat Over a year ago

@oskob I personally use google-gson code.google.com/p/google-gson . Apache libs are like this, lots of dependencies.

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