Re: NullPointer at ResultSet.java:113

Hi Dave.

I do not see a difference. If I close a Statement, I still get later
a NullPointerException.

I have a question, should I actually close a Statement at that point
or not? I have no clue what I am supposed to do. For the moment, I
removed the st.close() statement in my code. Performance and resource
management are not on my list of priorities.

Sincerely,
Hans Deragon

Dave Cramer wrote:

> Hans,
>
> I rebuilt the 7.2dev driver on the download site. Let me know if that
> fixes your problem
>
> Dave
>
>
>>-----Original Message-----
>>From: pgsql-jdbc-owner(at)postgresql(dot)org
>>[mailto:pgsql-jdbc-owner(at)postgresql(dot)org] On Behalf Of Hans Deragon
>>Sent: Thursday, March 14, 2002 6:42 PM
>>To: Dave(at)micro-automation(dot)net
>>Cc: 'pgsql-jdbc'
>>Subject: Re: [JDBC] NullPointer at ResultSet.java:113
>>
>>
>>Found the problem. I do:
>>
>> public static void main(String argv[]) throws Exception
>> {
>> Class.forName("org.postgresql.Driver");
>> Connection m_connection =
>> DriverManager.getConnection(DATABASEURL, USERNAME, PASSWORD);
>>
>> ResultSet rs =null;
>> {
>> Statement st = m_connection.createStatement();
>> rs = st.executeQuery("SELECT * FROM stocksymbol");
>> st.close(); // <------ Problem!
>> }
>>
>> System.err.println("\nHANS1" + rs);
>> rs.beforeFirst();
>> System.err.println("\nHANS1b");
>> while(rs.next())
>> {
>> System.err.println("\nHANS2\n");
>> }
>>
>>As you can see, the statement is closed before the ResultSet is used.
>>It used to work with old Postgresql drivers, but not the most
>>recent. I
>> will simply remove the st.close() statement in my close. I assume
>>that there is a finalize() function in the Statement such
>>that the close
>>is done automatically when the instance is disposed.
>>
>>Still, it would be nice if we got a nice exception instead of a
>>NullPointer exception. Can someone correct the code to generate such
>>exception?
>>
>>Sorry for the delay for my response. Its a pet project I am
>>working on,
>>on spare time.
>>
>>
>>Sincerely,
>>Hans Deragon
>>
>>Dave Cramer wrote:
>>
>>
>>>Hans,
>>>
>>>Generally this means that there is nothing in the result
>>>
>>set. Can you
>>
>>>give me some code which demonstrates this bug?
>>>
>>>Dave
>>>
>>>-----Original Message-----
>>>From: pgsql-jdbc-owner(at)postgresql(dot)org
>>>[mailto:pgsql-jdbc-owner(at)postgresql(dot)org] On Behalf Of Hans Deragon
>>>Sent: Saturday, March 09, 2002 6:13 AM
>>>To: pgsql-jdbc
>>>Subject: [JDBC] NullPointer at ResultSet.java:113
>>>
>>>
>>>Greetings.
>>>
>>>
>>> Upgraded yesterday to the latest pgjdbc2.jar. I am
>>>
>>using JDK 1.4.0.
>>
>>> My database is postgresql-7.1.3-2. I get:
>>>
>>> at org.postgresql.jdbc2.ResultSet.next(ResultSet.java:113)
>>> at
>>>
>>marketmanager.database.StockSymbol.list(StockSymbol.java:93)
>>
>>> at
>>>
>>>
>>marketmanager.datacollection.stocks.YahooCollector.fetchDataFr
>>omWeb(Yaho
>>
>>>oCollector.java:56)
>>> at
>>>
>>>
>>marketmanager.datacollection.stocks.YahooCollector.fetchData(Y
>>ahooCollec
>>
>>>tor.java:111)
>>> at
>>>marketmanager.datacollection.FetchData.main(FetchData.java:13)
>>>
>>> This is a bug for sure. If there is something wrong I am doing,
>>>then
>>>
>>>it should have been caught by an exception and report to me
>>>
>>what I was
>>
>>>doing wrong. My code works with an older version of the
>>>
>>postgresql jdbc
>>
>>>driver. And my code is pretty basic.
>>>
>>> I could not find on the development website the source
>>>
>>of this code.
>>
>>> Anybody can provide a pointer? May I suggest a direct
>>>
>>hyperlink to
>>
>>>the code to the development site from the
>>>
>>http://jdbc.postgresql.org/?
>>
>>>
>>>Ciao
>>>Hans
>>>
>>>
>>>
>>>
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>>>
>>>
>>>
>>>
>>
>>
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