CascadeType *defaults to the empty array* . See [CascadeType in Annotation Type OneToOne][1]


  [1]: http://download.oracle.com/javaee/5/api/javax/persistence/OneToOne.html#cascade%28%29

&gt; By default no operations are cascaded. 

You can check the source of `@OneToOne` at [here][1] . No operations are cascaded  by default

      /**
         * (Optional) The operations that must be cascaded to
          * the target of the association.
         *
         * &lt;p&gt; By default no operations are cascaded.
         */
       CascadeType[] cascade() default {};

Read more: http://kickjava.com/src/javax/persistence/OneToOne.java.htm#ixzz1d6ZWMM2y


  [1]: http://kickjava.com/src/javax/persistence/OneToOne.java.htm

I have been using [jsFiddle][1] to assist in helping answer questions around Stack Overflow, and some of the old code/scripts have started disappearing - seems like it expires after a certain length of inactivity.

I tried looking at the jsFiddle [documentation][2], and searching Google, but couldn&#39;t find any info on how long they store the scripts for.

Does anyone happen to know how long jsFiddle hosts your code for?


  [1]: http://www.jsfiddle.net
  [2]: http://doc.jsfiddle.net

How long does jsFiddle host your code for?

I have two tables `rooms` and `rooms facilities` and I have to select the rooms with desired facilities.

If I select a room with one facility (facility with id=4 - id_fu - ). using the following query Everything it&#39;s ok:

    SELECT u.* FROM rooms u 
    JOIN facilities_r fu 
    ON fu.id_uc = u.id_uc 
        AND fu.id_fu = &#39;4&#39; 
    WHERE 1 
        AND vizibility=&#39;1&#39; 
    GROUP BY id_uc 
    ORDER BY u_premium desc, id_uc DESC 

But if I want to select the room with more facilities, let&#39;s say facilities with id=4, and id=3 ..using the following query it doesn&#39;t work:

    SELECT u.* FROM room u 
    JOIN facilities_r fu 
    ON fu.id_uc=u.id_uc 
        AND fu.id_fu = &#39;4&#39; 
        AND fu.id_fu = &#39;3&#39; 
    WHERE 1 
        AND vizibility = &#39;1&#39; 
    GROUP BY id_uc 
    ORDER BY u_premium DESC, id_uc DESC 

I don&#39;t understand why it doesn&#39;t work, but I can&#39;t figure up how to put the condition.

Having issues with a MySQL Join that needs to meet multiple conditions

I am using Hibernate to persist this bean.

    import javax.persistence.*;

    @Entity
    public class Person {
        @Id @GeneratedValue
        private int id;
        @Column
        private String name;
        @OneToOne
        private Address addr;
    }

What is the `CascadeType` for `addr`?

default value for CascadeType in Hibernate

I am using Hibernate to persist this bean.
<pre><code class="hljs language-less">import javax.persistence.*;

@Entity
public class Person {
 @Id @GeneratedValue
 private int id;
 @Column
 private String name;
 @OneToOne
 private Address addr;
}
</code></pre>
What is the <code>CascadeType</code> for <code>addr</code>?

I am trying to implement password based encryption algorithm, but I get this exception:

&gt; javax.crypto.BadPaddingException: Given final block not properly padded

What might be the problem?

Here is my code:

    public class PasswordCrypter {
    
    	private Key key;

    	public PasswordCrypter(String password)  {
			try{
			    KeyGenerator generator;
				generator = KeyGenerator.getInstance(&quot;DES&quot;);
				SecureRandom sec = new SecureRandom(password.getBytes());
				generator.init(sec);
				key = generator.generateKey();
			} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    
    	
    	public byte[] encrypt(byte[] array) throws CrypterException {
    		try{
    			Cipher cipher = Cipher.getInstance(&quot;DES/ECB/PKCS5Padding&quot;);
    			cipher.init(Cipher.ENCRYPT_MODE, key);
    			 
			    return cipher.doFinal(array);
    		} catch (Exception e) {	
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	public byte[] decrypt(byte[] array) throws CrypterException{
        	try{
        		Cipher cipher = Cipher.getInstance(&quot;DES/ECB/PKCS5Padding&quot;);
        	    cipher.init(Cipher.DECRYPT_MODE, key);
        	    
        	    return cipher.doFinal(array);
        	} catch(Exception e ){
        		e.printStackTrace();
        	}
            return null;
    	}
    }
    
    
(The JUnit Test)
     
    public class PasswordCrypterTest {

    	private static final byte[] MESSAGE = &quot;Alpacas are awesome!&quot;.getBytes();
    	private PasswordCrypter[] passwordCrypters;
    	private byte[][] encryptedMessages;
    
    	@Before
    	public void setUp() {
    		passwordCrypters = new PasswordCrypter[] {
    			new PasswordCrypter(&quot;passwd&quot;),
    			new PasswordCrypter(&quot;passwd&quot;),
    			new PasswordCrypter(&quot;otherPasswd&quot;)
    		};
    
    		encryptedMessages = new byte[passwordCrypters.length][];
    		for (int i = 0; i &lt; passwordCrypters.length; i++) {
    			encryptedMessages[i] = passwordCrypters[i].encrypt(MESSAGE);
    		}
    	}
    
    	@Test
    	public void testEncrypt() {
    		for (byte[] encryptedMessage : encryptedMessages) {
    			assertFalse(Arrays.equals(MESSAGE, encryptedMessage));
    		}
    
    		assertFalse(Arrays.equals(encryptedMessages[0], encryptedMessages[2]));
    		assertFalse(Arrays.equals(encryptedMessages[1], encryptedMessages[2]));
    	}
    
    	@Test
    	public void testDecrypt() {
    		for (int i = 0; i &lt; passwordCrypters.length; i++) {
    			assertArrayEquals(MESSAGE, passwordCrypters[i].decrypt(encryptedMessages[i]));
    		}
    
    		assertArrayEquals(MESSAGE, passwordCrypters[0].decrypt(encryptedMessages[1]));
    		assertArrayEquals(MESSAGE, passwordCrypters[1].decrypt(encryptedMessages[0]));
    
    		try {
    			assertFalse(Arrays.equals(MESSAGE, passwordCrypters[0].decrypt(encryptedMessages[2])));
    		} catch (CrypterException e) {
    			// Anything goes as long as the above statement is not true.
    		}
    
    		try {
    			assertFalse(Arrays.equals(MESSAGE, passwordCrypters[2].decrypt(encryptedMessages[1])));
    		} catch (CrypterException e) {
    			// Anything goes as long as the above statement is not true.
    		}
    	}
    }




Given final block not properly padded

What will the command 

    Class.forName(&quot;oracle.jdbc.driver.OracleDriver&quot;)

exactly do while connecting to a Oracle database? Is there an alternate way of doing the same thing?

What is the actual use of Class.forName(&quot;oracle.jdbc.driver.OracleDriver&quot;) while connecting to a database?

I&#39;ve seen the wildcard &lt;?&gt; used before to mean any object - but recently saw a use of:

    &lt;? extends Object&gt;

Since all objects extend Object, are these two usages synonymous?

What&#39;s the difference between &lt;?&gt; and &lt;? extends Object&gt; in Java Generics?

I know this question has been asked  here a few times before. But i haven&#39;t seen any possible solution yet.
Before i make the project &#39;Run as Android Application&#39; , if i do not clean it, i receive the following error and have to restart Eclipse ... and clean again.

    Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define
         Lcom/jstun/core/attribute/MessageAttributeInterface;

com.jstun.core... is a part of my src folder, of course i can&#39;t remove it. And even if i remove that package, another package will show up as an error like:

    Unable to execute dex: Multiple dex files define
         Landroid/support/v4/app/ActivityCompatHoneycomb;

I&#39;ve seen this error since updating to ADT 15, i&#39;m using Eclipse Galileo on Ubuntu
Do you have any idea? Thanks for any reply!


Unable to execute dex: Multiple dex files define

I am framing a regex to check if a word starts with `http://` or `https://` or `ftp://`, my code is as follows,

         public static void main(String[] args) {
		try{
			String test = &quot;http://yahoo.com&quot;;
			System.out.println(test.matches(&quot;^(http|https|ftp)://&quot;));
		} finally{
			
		}
	}

It prints `false`. I also checked stackoverflow post https://stackoverflow.com/questions/4643142/regex-to-test-if-string-begins-with-http-or-https

The regex seems to be right but why is it not matching?. I even tried `^(http|https|ftp)\://` and `^(http|https|ftp)\\://`

Regex to check with starts with http://, https:// or ftp://

How would I achieve this using Hibernate Restrictions?

    (((A=&#39;X&#39;) and (B in(&#39;X&#39;,Y))) or ((A=&#39;Y&#39;) and (B=&#39;Z&#39;)))


Hibernate Criteria Restrictions AND / OR combination

I wish I knew what exactly does each item in this list, how it works, what the consequences and when is the correct time to use.

 1. Refresh
 2. Evict
 3. Replicate
 4. Flush

I even wonder what each one does, but I&#39;m not absolutely sure, so I&#39;m asking for your help, cause I really want to understand it.

I know it&#39;s a pretty generic question, but I think really useful to know about it all.

Thanks.

Hibernate: Refresh, Evict, Replicate and Flush

Before I posted this question, I already looked [this][1], but I couldn&#39;t get what I was looking for.

I know that for the query I wrote there may exist only one row or none at all. So, there is not reason for me to use `getResultList()`.
 
Here is my code:

    String hql=&quot;from DrawUnusedBalance where unusedBalanceDate= :today&quot;;
    Query query=em.createQuery(hql);
    query.setParameter(&quot;today&quot;,new LocalDate());
    
    DrawUnusedBalance drawUnusedBalance= 
        (DrawUnusedBalance)query.getSingleResult();// we can have only a
                                                   // single datum per day
    //`System.out.println(drawUnusedBalance.toString());`

The problem is, if there is no row, it throws an exception, and if not it works fine. I know the problem but I am also looking for the best solution. 

What I wanted is, if there is no row in the DB I wanted to get a null object (instead of getting an exception) so I will insert a new data, if it is not null, I just want to update it.

There is one way to handle this, which I believe is not the right way to do it. It is: I will have a try-catch block and if it throws an exception I can write to insert new data in to the DB on the catch block. But I believe there will be a better way.

  [1]: https://stackoverflow.com/questions/4848776/no-entity-found-for-query-exception

javax.persistence.NoResultException: No entity found for query

I have a method annotated with @Transactional. I retrieve an object from my Oracle DB, change a field, and then return from the method. I forgot to save the object, but discovered that the database gets updated anyway.

applicationContext

    &lt;tx:annotation-driven /&gt;
    &lt;bean id=&quot;transactionManager&quot; class=&quot;org.springframework.orm.hibernate3.HibernateTransactionManager&quot;&gt;
        &lt;property name=&quot;sessionFactory&quot; ref=&quot;sessionFactory&quot; /&gt;
    &lt;/bean&gt;

my method

    @Transactional
    public void myMethod(long id) {
        MyObject myObj = dao.getMstAttributeById(id);
        myObj.setName(&quot;new name&quot;);
        //dao.update(myObj);
    }

my question is why does MyObject get persisted to the database?


Transactional saves without calling update method

I&#39;ve been playing around with a very simple JPA example and am trying to tweak it to an existing database.  But I can&#39;t get past this error.  (Below.)  It just has to be some simple thing I am not seeing.

    org.hibernate.hql.internal.ast.QuerySyntaxException: FooBar is not mapped [SELECT r FROM FooBar r]
      org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:180)
      org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:110)
      org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:93)

In the DocumentManager class below (a simple servlet, as that is my target goal) does two things:

 1. insert a row
 1. return all rows

The insertion works perfectly--all is good there.  The problem is with the retrieval.  I&#39;ve tried all sorts of values for the `Query q = entityManager.createQuery` parameters, but no luck, and I&#39;ve tried variously more explicate annotations of the class (like column types), all without success.

Please save me from myself.  I&#39;m certain it is something small.  My inexperience with JPA is preventing me from going any farther.


**My ./src/ch/geekomatic/jpa/FooBar.java file:**

    @Entity
    @Table( name = &quot;foobar&quot; )
    public class FooBar {
        @Id 
        @GeneratedValue(strategy=GenerationType.IDENTITY) 
        @Column(name=&quot;id&quot;)
        private int id;
	
        @Column(name=&quot;rcpt_who&quot;)
        private String rcpt_who;
	
        @Column(name=&quot;rcpt_what&quot;)
        private String rcpt_what;
	
        @Column(name=&quot;rcpt_where&quot;)
        private String rcpt_where;
	
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
	
        public String getRcpt_who() {
            return rcpt_who;
        }
        public void setRcpt_who(String rcpt_who) {
            this.rcpt_who = rcpt_who;
        }
	
        //snip...the other getters/setters are here
    }

**My ./src/ch/geekomatic/jpa/DocumentManager.java class**

    public class DocumentManager extends HttpServlet {
        private EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory( &quot;ch.geekomatic.jpa&quot; );
        
        protected void tearDown() throws Exception {
            entityManagerFactory.close();
        }
    
       @Override
       public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
           FooBar document = new FooBar();
           document.setRcpt_what(&quot;my what&quot;);
           document.setRcpt_who(&quot;my who&quot;);
           
           persist(document);
           
           retrieveAll(response);
       }
        
       public void persist(FooBar document) {
           EntityManager entityManager = entityManagerFactory.createEntityManager();
           entityManager.getTransaction().begin();
           entityManager.persist( document );
           entityManager.getTransaction().commit();
           entityManager.close();
       }
       
        public void retrieveAll(HttpServletResponse response) throws IOException {
            EntityManager entityManager = entityManagerFactory.createEntityManager();
            entityManager.getTransaction().begin();
            
            //  *** PROBLEM LINE ***
            Query q = entityManager.createQuery( &quot;SELECT r FROM foobar r&quot;, FooBar.class );
            List&lt;FooBar&gt; result = q.getResultList();
            
            for ( FooBar doc : result ) {
                response.getOutputStream().write(event.toString().getBytes());
                System.out.println( &quot;Document &quot; + doc.getId()  );
            }
            entityManager.getTransaction().commit();
            entityManager.close();
        }
    }

**The {tomcat-home}/webapps/ROOT/WEB-INF/classes/METE-INF/persistance.xml file**

    &lt;persistence xmlns=&quot;http://java.sun.com/xml/ns/persistence&quot;
        xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
        xsi:schemaLocation=&quot;http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd&quot;
        version=&quot;2.0&quot;&gt;
        
    &lt;persistence-unit name=&quot;ch.geekomatic.jpa&quot;&gt;
        &lt;description&gt;test stuff for dc&lt;/description&gt;

        &lt;class&gt;ch.geekomatic.jpa.FooBar&lt;/class&gt;

        &lt;properties&gt;
            &lt;property name=&quot;javax.persistence.jdbc.driver&quot;   value=&quot;com.mysql.jdbc.Driver&quot; /&gt;
            &lt;property name=&quot;javax.persistence.jdbc.url&quot;      value=&quot;jdbc:mysql://svr:3306/test&quot; /&gt;
            &lt;property name=&quot;javax.persistence.jdbc.user&quot;     value=&quot;wafflesAreYummie&quot; /&gt;
            &lt;property name=&quot;javax.persistence.jdbc.password&quot; value=&quot;poniesRock&quot; /&gt;

            &lt;property name=&quot;hibernate.show_sql&quot;     value=&quot;true&quot; /&gt;
            &lt;property name=&quot;hibernate.hbm2ddl.auto&quot; value=&quot;create&quot; /&gt;
        &lt;/properties&gt;

    &lt;/persistence-unit&gt;
    &lt;/persistence&gt;

**The MySQL table description:**


    mysql&gt; describe foobar;
    +------------+--------------+------+-----+---------+----------------+
    | Field      | Type         | Null | Key | Default | Extra          |
    +------------+--------------+------+-----+---------+----------------+
    | id         | int(11)      | NO   | PRI | NULL    | auto_increment |
    | rcpt_what  | varchar(255) | YES  |     | NULL    |                |
    | rcpt_where | varchar(255) | YES  |     | NULL    |                |
    | rcpt_who   | varchar(255) | YES  |     | NULL    |                |
    +------------+--------------+------+-----+---------+----------------+
    4 rows in set (0.00 sec)


Content Type	Original Author	Original Content on Stackoverflow
Question	wannik	View Question on Stackoverflow
Solution 1 - Java	Sandeep Pathak	View Answer on Stackoverflow
Solution 2 - Java	Ken Chan	View Answer on Stackoverflow

default value for CascadeType in Hibernate

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Having issues with a MySQL Join that needs to meet multiple conditions

How long does jsFiddle host your code for?

Attributions