Juri Glass

MaheshS Kumbhar wrote:Hi

How can we access default variable using object reference variable directly as in following code segment

class abc
{
int i;
public static void main(String[]s)
{
abc a = new abc();
System.out.print(a.i);
}
}

This code compiles and gives you the value of i. Hints:
* Since you don't initialize your variable, it's autoinitialized to 0.
* You are using print. Try using println instead, it appends a newline. You then may see your output.

Best
Juri

Hi

When I do:
ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); URL resource = classLoader.getResource(name);
resource is null, the Java API says that getResource returns "A URL object for reading the resource, or null if the resource could not be found or the invoker doesn't have adequate privileges to get the resource."

So, how do I determine where the classloader is looking for the resource?

Best
Juri

Hi

I have a maven2 project which builds me a war file to run in a glassfish. Now I want to read from a file located in WEB-INF (can be moved if necessary).

In a servlet I can do:ServletContext context = getServletContext(); InputStream in = context.getResourceAsStream("WEB-INF/some.file");

How to test that with a JUnit 4.7 testcase?
How to refer to the files in WEB-INF in the JUnit tests? How do I set the context?

The maven project has this structure (shortened):- src - main - java - webapp - WEB-INF - test

Best Juri

EDIT: Typo

Ok, I removed the
@GeneratedValue(strategy = GenerationType.AUTO)
and its working.

But now I have to submit for every instance an id. Nice would be something like:
If no id given, generate one.

Hi

I want to set a auto-incremented key by myself. How to achieve this?

The class looks at the moment like this:
@Entity public class MyItem implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO) @Basic(optional = false) private Integer id; ... }

The corresponding field in the database has the auto-increment flag attached.

I am using JPA/Hibernate/MySQL/Tomcat. Btw.: I cannot change the database schema.

Edit:
If I set the id in an instance and commit it, I get this exception:
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: foo.bar.MyItem at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:79) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:38) at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:618) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:592) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:596) at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:220)

Hi

I want to initialize some things after tomcat is started.
As far as I know, there are two approaches:

* Write a Servlet and configure it in the web.xml with load-on-startup. But this seems to me like a hack. I want to init some stuff and don't serve someone.

* Add a LifecycleListener. How to configure this? In http://docs.sun.com/source/817-6087/dglfcycl.html#wp16901 is talked about a domain.xml, sometimes about a server.xml. I don't have neither.

Which is the 'right' way?

Best