got an example of the Internet to use Digest because I want to read
xml file persistence.xml

qdo will run the line Persiste c = (Persea) digester.parse (input);
of the error below ...

I do not know where I'm missing .... if someone can help me would ...

abs


[code]
File path = / C: / workspace / TesteJPA / build / classes / META-INF / persistence.xml
java.lang.NullPointerException
At xml.PersisDriver.main (PersisDriver.java: 48)

[/ code]





[code]
public class PersisDriver (

public static void main (String [] args) (

try (



Digest digest = new Digest ();
digester.setValidating (false);

digester.addObjectCreate ( "persistence-unit", Persiste.class);

digester.addObjectCreate ( "persistence-unit/description," Description.class);
digester.addBeanPropertySetter ( "persistence-unit/description", "name");

digester.addSetNext ( "persistence-unit/description/description", "addDescription");

digester.addObjectCreate ( "persistence-unit/provider," Provider.class);
digester.addBeanPropertySetter ( "persistence-unit/provider/provider", "name");

digester.addSetNext ( "persistence-unit/description", "addProvider");

Myurl URL = Manager.class.getResource ( "/ META-INF/persistence.xml");
System.out.println ( "File Path =" + myurl.getFile ());
File input = new File (myurl.getFile ());


C = persistent (persists) digester.parse (input);

System.out.println (c.toString ());

) Catch (Exception exc) (
exc.printStackTrace ();
)
)
)

[/ code]







[code]


import java.util.Vector;

public class Persiste (
private String name;


Private Vector descriptions;
Vector private providers;

Public persists () (
Descriptions = new Vector ();
Providers = new Vector ();
)

public void addDescription (Description ds) (
Descriptions.addElement (ds);
)

public void addProvider (Provider ps) (
Providers.addElement (ps);
)

public String getName () (
Return name;
)

Public void setName (String name) (
This.Name = name;
)

Public String toString () (
String newline = System.getProperty ( "line.separator");
StringBuffer buf = new StringBuffer ();

buf.append ( "Descriptions --- ---"). append (newline);
for (int i = 0; i <descriptions.size () i + +) (
buf.append (descriptions.elementAt (i)). append (newline);
)

buf.append ( "--- --- Providers"). append (newline);
for (int i = 0; i <providers.size () i + +) (
buf.append (providers.elementAt (i)). append (newline);
)

buf.toString return ();
)

)
-------------

public class Description (


Private String name;

Public String getName () (
Return name;
)

Public void setName (String name) (
This.Name = name;
)


)
----
public class Provider (


Private String name;

Public String getName () (
Return name;
)

Public void setName (String name) (
This.Name = name;
)


)

[/ code]

- xml

[code]

<! -? Xml version = "1.0" encoding = "UTF-8 "?-->
<persistence version = "1.0" xmlns = "http://java.sun.com/xml/ns/persistence" xmlns: XSI = "http://www.w3.org/2001/XMLSchema-instance" XSI: schemaLocation = "http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/ ... ce_1_0.xsd">
<persistence-unit Name="JPA9">
<description>
Simple example of persistence using JPA.
</ description>
<provider> org.hibernate.ejb.HibernatePersistence </ provider>
<class> br.com.exemplojpa.modelo.Usuario </ class>
<class> br.com.exemplojpa.modelo.Usuario1 </ class>
<class> br.com.exemplojpa.modelo.NotaFiscal </ class>
<class> br.com.exemplojpa.modelo.NotaFiscalItem </ class>
<class> br.com.exemplojpa.modelo.Universidade </ class>
<class> br.com.exemplojpa.modelo.Centro </ class>
<class> br.com.exemplojpa.modelo.Turma </ class>
<class> br.com.exemplojpa.modelo.Aluno </ class>
<class> br.com.exemplojpa.modelo.Cliente </ class>
<class> br.com.exemplojpa.modelo.Estados </ class>
<class> br.com.exemplojpa.modelo.Cidades </ class>
<properties>
<property name="hibernate.archive.autodetetion" value="class"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="root" />
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/exemplojpa" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="update" />

<property name="hibernate.format_sql" value="true" />

</ properties>
</ persistence-unit>
[/ code]