Java servlet java.lang.NoClassDefFoundError: org/json/JSONObject

Question

I have a very simple servlet,when I add the JSON library and try to run it i have java.lang.NoClassDefFoundError: org/json/JSONObject (without the json library every thing works fine). I am compiling like this (in ubuntu) :

javac  -classpath ":./libs/json-20160810.jar:/usr/local/tomcat/lib/servlet-api.jar:." *.java && mv *.class /usr/local/tomcat/webapps/ROOT/WEB-INF/classes/

It compiles without any errors, it occurs at runtime.

I am not using any IDE for this.

The servlet is running in a docker:

the docker file :

FROM tomcat:7

RUN apt-get update
RUN apt-get install default-jdk --yes

COPY . /src

WORKDIR /src/

RUN mkdir -p /usr/local/tomcat/webapps/ROOT/WEB-INF/classes

RUN javac  -classpath ./libs/json-20160810.jar:/usr/local/tomcat/lib/servlet-api.jar:. *.java && mv *.class /usr/local/tomcat/webapps/ROOT/WEB-INF/classes/

RUN cp web.xml /usr/local/tomcat/webapps/ROOT/WEB-INF

add this in web.xml, <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20080701</version> </dependency> — Sandeep Roy
– Sandeep Roy, Commented Oct 14, 2016 at 6:10
@SandeepRoy Looks like op do not use maven. Also you can not add a dependency in a web.xml — Jens
– Jens, Commented Oct 14, 2016 at 6:15
as @kuhajeyan mentioned, the json...jar is not in your tomcat classpath. — Jens
– Jens, Commented Oct 14, 2016 at 6:38

Peter Gelderbloem · Accepted Answer · 2016-10-14 08:23:37Z

2

It is better to add a line to copy the JSON jar to your application's WEB-INF/lib instead of Tomcat lib as your application uses it, not tomcat itself

answered Oct 14, 2016 at 8:23

Peter Gelderbloem

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1 Comment

Maxim Toyberman Over a year ago

Solved the problem.@Peter Gelderbloem

kuhajeyan · Accepted Answer · 2016-10-14 06:13:49Z

1

You need to provide json libraries in classpath when you run the application as well. Easiest way would be put them in your tomcat's lib folder put json-20160810.jar in lib of tomcat

answered Oct 14, 2016 at 6:13

kuhajeyan

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3 Comments

Maxim Toyberman Over a year ago

I need to create lib folder ? because i don't see it . @kuhajeyan

kuhajeyan Over a year ago

@Maximtoyberman there should be 'lib' folder in tomcat installation. or you need to create a one

ujulu Over a year ago

Putting the jar into tomcat lib is not a good idea. What is if the app is deployed on another server?

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