Reputation: 2404
Simple problem i know but I cannot see what is wrong. I have the following code:
String dxorderId = request.getParameter("orderid");
long orderid = Long.parseLong((dxorderId));
It is inside a servlet which is called from a PL/SQL procedure. The value of dxorderid is retrieved from a parameter in the URL of the page called. Therefore it seems to be treated as a string. So I must convert the string into a long. However, when I use the code above, I get the following error:
14-Nov-2013 13:07:41 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [com.zf.proceed.service.servlets.ViewOrderServlet] in context with path [/webapp] threw exception
java.lang.NumberFormatException: null
at java.lang.Long.parseLong(Long.java:372)
at java.lang.Long.parseLong(Long.java:461)
at com.zf.proceed.service.servlets.ViewOrderServlet.doRequest(ViewOrderServlet.java:28)
at com.zf.proceed.service.servlets.ProceedBaseServlet.doRequest(ProceedBaseServlet.java:106)
at com.zf.proceed.service.servlets.ProceedBaseServlet.doGet(ProceedBaseServlet.java:39)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
I know it means that it cant be parsed but I dont Know why it cant. the value being input is 1454.
Upvotes: -1
Views: 24068
Reputation: 3197
java.lang.NumberFormatException: null
From the exception information, we can learn that dxorderid is null which causes java.lang.NumberFormatException
.
Before parsing data, you need to check whether the value to be parsed is null or empty first .
Upvotes: 0
Reputation: 4982
error is due to this line.
String dxorderId = request.getParameter("orderid");
Check whether parameter name "orderid" is correct or not or ensure that its value is not null
Upvotes: 0
Reputation: 12993
java.lang.NumberFormatException: null
If String dxorderId
is null then it will throw NumberFormatException
Solution
Check dxorderId
is not null
and not empty string
if(dxorderId != null && !dxorderId.equals(""))
{
long orderid = Long.parseLong((dxorderId));
}
From oracle docs NumberFormatException
public class NumberFormatException
extends IllegalArgumentException
Thrown to indicate that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format.
Upvotes: 3
Reputation: 3106
Well a NumberFormatException
means that the given Data can not be converted to a Long
because it does not represent a Long
-Value, so the problem lies at the source of the String, not in the Java Long-Parser.
In your specific case the Parser states that the given value was null
, so your request.getParameter("orderid");
return null
.
Upvotes: 0
Reputation: 7804
Take a look at the exception closely : java.lang.NumberFormatException: null
the above statement indicates that value for dxorderId
is null. Problem is with this line:
String dxorderId = request.getParameter("orderid");
Upvotes: 0
Reputation: 27356
I'm afraid the value is not 1454
. The value is null
, as evidenced by this line:
java.lang.NumberFormatException: null
You need to check your parameter name, and make sure you've got it right, including case and invisible characters.
Upvotes: 3