Re: Help with NSXMLOutputStream/NSSMLInputStream

Wed, 14 Dec 2005 09:42:31 -0800

You are correct after inserting the null check the error has moved to line 58:
  xmlos = new NSXMLOutputStream(os); <<--- line 58

New exception:

[2005-12-14 11:35:14 EST] <main> java.lang.ExceptionInInitializerError
at ProcessorService.serialize(ProcessorService.java:58)
at Application.<init>(Application.java:52)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:308)
at java.lang.Class.newInstance(Class.java:261)
at com.webobjects.appserver.WOApplication.main(WOApplication.java:323)
at Application.main(Application.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.webobjects._bootstrap.WOBootstrap.main(WOBootstrap.java:71)
Caused by: java.lang.IllegalArgumentException: No attributes are implemented
at org.apache.crimson.jaxp.DocumentBuilderFactoryImpl.setAttribute(DocumentBuilderFactoryImpl.java:93)
at com.webobjects.foundation.xml.NSXMLOutputStream.<clinit>(NSXMLOutputStream.java:445)
... 15 more

On Dec 14, 2005, at 11:27 AM, Jean-François Veillette wrote:

hmmm ...
if xmlos is null, would it be that the exception is thrown before the assignation ?  so the error would either on :
  os = new BufferedOutputStream(new FileOutputStream(fileName));
if there is a problem creating the bufferedOutputStream (bad file output stream).

or if os is valid, it would be on that line :
  xmlos = new NSXMLOutputStream(os);

If there is a problem on one of those lines, then the variables (os, xmlos) won't be initialized, and entering the finally will throw another exception with the actual code.
In the finally clause, wrap the 'flush'/'close' in a null condition  'if(xmlos != null) {...}'

Look at the error logs, there must be something  in there that catch(...) reported.

- jfv

Le 05-12-14, à 11:16, Robert Walker a écrit :

Oops sorry again.  Ignore last posting....

Line 70 is actually

                       xmlos.flush();

On Dec 14, 2005, at 11:06 AM, Jean-François Veillette wrote:

  at ProcessorService.serialize(ProcessorService.java:70)

where is line 70 ?

- jfv

Le 05-12-14, à 11:01, Robert Walker a écrit :

I need to serialize some objects for use in web services and am getting the following exception for this example code:

Error occurs on both Xcode 2.0/WO 5.2.4 and Xcode 2.2/WO 5.3.1... Simply calling this static method from Application class as a test. Doesn't seem to matter where it's called: also tried calling it from an action method on Main page.

  public static void serialize() {
  String fileName = "/tmp/example.xml";
  BufferedOutputStream os = null;
  NSXMLOutputStream xmlos = null;

 

  try {
  // File output stream
  os = new BufferedOutputStream(new FileOutputStream(fileName));

 

  // XML output stream
  xmlos = new NSXMLOutputStream(os);

 

  // Write the data
  xmlos.writeObject("Hello World!");
  xmlos.writeInt(5);
  } catch (Exception e) {
  NSLog.err.appendln("Exception encountered: " + e.getMessage());
  if (NSLog.debugLoggingAllowedForLevel(NSLog.DebugLevelCritical)) {
  NSLog.debug.appendln(e);
  }
  } finally {
  try {
  // close the streams
  xmlos.flush();
  xmlos.close();
  os.close();
  } catch (Exception e) {
  NSLog.err.appendln("Exception encountered: " + e.getMessage());
  if (NSLog.debugLoggingAllowedForLevel(NSLog.DebugLevelCritical)) {
  NSLog.debug.appendln(e);
  }
  }
  }
  }

------------------------
Exception:

[2005-12-14 10:56:29 EST] <main> java.lang.NullPointerException
  at ProcessorService.serialize(ProcessorService.java:70)
  at Application.<init>(Application.java:52)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
  at java.lang.Class.newInstance0(Class.java:308)
  at java.lang.Class.newInstance(Class.java:261)
  at com.webobjects.appserver.WOApplication.main(WOApplication.java:323)
  at Application.main(Application.java:19)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:324)
  at com.webobjects._bootstrap.WOBootstrap.main(WOBootstrap.java:71)

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