Databases
StackOverflow2013
Postsdbo
PONumberFormatException using <c:url in jsp
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PONumberFormatException using <c:url in jsp
    primarykey
    data
    text
    <p>In my web app,I have an Item class with </p> <pre><code>public class Item { private Long item_id; private String name; ... } ... &lt;servlet-mapping&gt; &lt;servlet-name&gt;edititemservlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/edititem&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; ... </code></pre> <p>While listing the items,I tried to use <pre><code>&lt;a href="&lt;c:url value="editItem?itemId=${item.item_id}" /&gt;" &gt;${item.name}&lt;/a&gt; </code></pre> <p>This works .But, when I tried the following to use </p> <pre><code>&lt;c:url value="editItem" var="editItemurl"&gt; &lt;c:param name="itemId" value="${item.item_id}" /&gt; &lt;/c:url&gt; &lt;c:forEach var="item" items="${items}" varStatus="itemslistCount"&gt; &lt;tr&gt;&lt;td&gt;${itemslistCount.count} &lt;/td&gt; &lt;td&gt;&lt;a href="${editItemurl}" &gt;${item.name}&lt;/a&gt;&lt;/td&gt; </code></pre> <p>I expected to get the same result. But this causes NumbeFformatException .</p> <pre><code>java.lang.NumberFormatException: For input string: "" java.lang.NumberFormatException.forInputString(NumberFormatException.java:48) java.lang.Long.parseLong(Long.java:424) </code></pre> <p>I tried to print ${editItemurl} and it displays an empty string.</p> <p>Any idea how I can correct this?</p> <p>thanks</p> <p>mark</p> <p>p.s: here is the stack trace</p> <pre><code>java.lang.NumberFormatException: For input string: "" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48) at java.lang.Long.parseLong(Long.java:424) at java.lang.Long.parseLong(Long.java:461) at myshop.servlets.ItemEditServlet.doGet(Unknown Source) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619) </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USmarkjason72
    1. USmarkjason72
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PONumberFormatException using <c:url in jsp
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PONumberFormatException using <c:url in jsp
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI'm not sure about the cause of the exception. Do you have some more stacktrace? Please also mention which JSTL version you're using. Regardless, you should actually be placing the `<c:url>` inside the `<c:forEach>` in order to have access to `${item}`.
      singulars
      1. PONumberFormatException using <c:url in jsp
      1. USBalusC
    2. CO@BalusC .sorry for the foolish mistake..I should have figured it out myself..thanks a million
      singulars
      1. PONumberFormatException using <c:url in jsp
      1. USmarkjason72
    3. CODid it solve the problem? I'll repost the comment as an answer. I however still wonder why the NFE is been thrown. I wouldn't expect it to be thrown in this construct. Can you please include the entire stacktrace?
      singulars
      1. PONumberFormatException using <c:url in jsp
      1. USBalusC
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload