Why when using json not new JSONArray (json)

json

As stated, when we use json, first a good fight as a json statement:
String json = [{id: 1, sender: "zhangsan2", receiver: "zhangsan4", content: "This is a test", time: "2013-01-03 09:44:27.0"}]
Then use JSONArray array = new JSONArray (json); preparing parsing throws java.lang.ClassNotFoundException: org.json.JSONArray exception.
Why?
There is a problem with the statement is json?
JSON verification results <-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
Reply:
2013-1-3 17:22:15 org.apache.catalina.core.StandardWrapperValve invoke
Serious: Servlet.service () for servlet selectsx threw exception
java.lang.ClassNotFoundException: org.json.JSONArray
at org.apache.catalina.loader.WebappClassLoader.loadClass (WebappClassLoader.java: 1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass (WebappClassLoader.java: 1526)
at com.click369.sgy.wbserver.util.JSONParse.getJSON_SX (JSONParse.java: 195) / / project package
at com.click369.sgy.wbserver.servlet.DoSelectSXServlet.doPost (DoSelectSXServlet.java: 34)
at com.click369.sgy.wbserver.servlet.DoSelectSXServlet.doGet (DoSelectSXServlet.java: 22)
at javax.servlet.http.HttpServlet.service (HttpServlet.java: 617)
at javax.servlet.http.HttpServlet.service (HttpServlet.java: 717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java: 290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java: 206)
at com.click369.sgy.wbserver.filter.ServerFilter.doFilter (ServerFilter.java: 32)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java: 235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java: 206)
at org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java: 233)
at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java: 191)
at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java: 127)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java: 102)
at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java: 109)
at org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.java: 293)
at org.apache.coyote.http11.Http11Processor.process (Http11Processor.java: 859)
at org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process (Http11Protocol.java: 602)
at org.apache.tomcat.util.net.JIoEndpoint $ Worker.run (JIoEndpoint.java: 489)
at java.lang.Thread.run (Thread.java: 662)
Reply:
The error is in the JSONArray array = new JSONArray (json); this line!
Reply:
No guide json package, go online to the next
Reply:
The end result is a perversion because the jar package! !