Java throws a NullPointerException when you try to do something with an object whose value is null (ie, its not pointing to anything). In the code below, blob is set to null then you try to call the getBinaryOutputStream() method on it. You need to be sure blob is set to a valid object before you can do anything with it.
-lkench -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick O. Thurman Sent: Friday, November 10, 2006 2:33 PM To: Post all your questions about iText here Subject: [iText-questions] what causes the NullPointerException What causes the NullPointerException and why does it happen in the following code? What are some solutions? import com.lowagie.text.Document; import com.lowagie.text.DocumentException; import com.lowagie.text.Paragraph; import com.lowagie.text.pdf.*; import java.sql.SQLException; import oracle.sql.BLOB; import java.io.FileOutputStream; import java.io.IOException; public class HelloWorld { public static BLOB doIt(oracle.sql.ARRAY args) { System.out.println("Hello World"); BLOB blob = null; Document document = new Document(); try { PdfWriter.getInstance(document, blob.getBinaryOutputStream()); document.open(); document.add(new Paragraph("Hello World")); } catch (DocumentException de) { System.err.println(de.getMessage()); } catch (SQLException se) { System.err.println(se.getMessage()); } document.close(); return(blob); } } Pat, Patrick O. Thurman Stephen F. Austin State University Information Technology Services Data Base Administrator Phone: (936) 468-1074 Fax: (936) 468-1117 ------------------------------------------------------------------------ - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions --------------------------------------------------------------------------------------------------------- This e-mail message may contain privileged and/or confidential information, and is intended to be received only by persons entitled to receive such information. If you have received this e-mail in error, please notify the sender immediately. Please delete it and all attachments from any servers, hard drives or any other media. Other use of this e-mail by you is strictly prohibited. All e-mails and attachments sent and received are subject to monitoring, reading and archival by Monsanto. The recipient of this e-mail is solely responsible for checking for the presence of "Viruses" or other "Malware". Monsanto accepts no liability for any damage caused by any such code transmitted by or accompanying this e-mail or any attachment. --------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions
