`setMaxResults` is the same as `LIMIT` in SQL-  you are *setting the maximum number of rows you want* returned.  This is a very common use case of course.

`setFetchSize` is about *optimization*, which can change *how* Hibernate goes about sending the results to the caller (example: buffered, in different size chunks). 
`setFetchSize` is NOT implemented by all database drivers.  

`setMaxResults` limits the number of results the query will ever get.

`setFetchSize` tells the jdbc driver how many rows to return in one chunk, for large queries.  Say you want 1000 rows.  If you set the fetch size to 100, the db will return 100, then another 100 when you want more, and so on.  `setFetchSize` will do nothing if your driver does not support it.

For example, if the table has 100 records, then

    criteria.setMaxResults(25);

will only fetch 25 records out of 100 records, and

    criteria.setFetchSize(20);

will fetch 20 records at each time until it reads all 100 records from the table.

I need to get a `tr` element which contains a `td` element which contains specific text. The `td` will contain that text and only that text (so I need `text = &#39;foo&#39;` not `text contains &#39;foo&#39;` logic).

So I need the equivalent of the following &#39;pseudo jQuery&#39;:

    var tableRow = $(table td[text = &#39;foo&#39;]).parent(&#39;tr&#39;);

Can anyone provide the correct syntax?

jQuery - find table row containing table cell containing specific text

I am new in log4j. Can anyone explain how to create my own Appender? i.e. how to implement the classes and interfaces and how to override it?

How to create my own Appender in log4j?

What is difference between `setMaxResults` and `setFetchSize` in org.hibernate.Query? I just can no get it =)

What is difference between setMaxResults and setFetchSize in org.hibernate.Query?

<p>What is difference between <code>setMaxResults</code> and <code>setFetchSize</code> in org.hibernate.Query? I just can no get it =)</p>


I am writing a &quot;server-side extension&quot; for [SmartFoxServer][1] (SFS).  In my login script, I need to make a connection to MS SQL Server, which I am attempting to do using JDBC.  I have tested the JDBC code in my debug environment, and it works fine.

BUT

When I put the server-side extension in the SFS &quot;extensions&quot; folder (as per spec), I&#39;m getting a `com.microsoft.sqlserver.jdbc.SQLServerException`:

&gt; &quot;This driver is not configured for integrated authentication.&quot;.

I Googled for this error, and found that it&#39;s usually because the file `sqljdbc_auth.dll` is not in the system path; I have copied this file into a folder in my system path, and still it does not work!

Any other suggestions?


  [1]: http://smartfoxserver.com

JDBC SQLServerException: &quot;This driver is not configured for integrated authentication.&quot;

Ehcache [talks about][1] on-heap and off-heap memory. What is the difference? What JVM args are used to configure them?


  [1]: http://ehcache.org/documentation/offheap_store.html#Storage

Difference between &quot;on-heap&quot; and &quot;off-heap&quot;

I&#39;m working on a Java project that uses the JNI.  The JNI calls a custom library that I&#39;ve written myself, let&#39;s say mylib.dll, and that depends on a 3rd party library, libsndfile-1.dll.

When I run my program it crashes with 

    java.lang.UnsatisfiedLinkError:  C:\...path...\mylib.dll: Can&#39;t find dependent libraries.

I&#39;ve searched this site (and others) and I&#39;ve tried a number of fixes:

1. I ran dependency walker. DW gave a couple of warnings -- that two libraries required by libsndfile, MPR.DLL and SHLWAPI.DLL, had &quot;unresolved imports&quot; -- but the [DW FAQ][1] said that these warnings could be safely ignored. 

2. I fixed the method names in mylib.dll, as suggested [here][2].  The method names had somehow gotten mangled by the compiler, but I added linker flags and the dll method names now match those in my jni header file exactly.

3. I put all of these DLLs in the same directory -- the same directory as the .jar that calls them -- to ensure that they&#39;re on the right PATH.

No dice.

Does anyone have any idea what&#39;s going on?

I&#39;m doing my development in Visual Studio 2010 on a MacBook pro (via Parallels). I&#39;m doing my testing in Windows XP on a toshiba laptop.


  [1]: http://www.dependencywalker.com/faq.html
  [2]: http://witte-consulting.com/blog/jni-java-native-interface-exception-in-thread-main-javalangunsatisfiedlinkerror-can-t-find-dependent-libraries/

How to fix an UnsatisfiedLinkError (Can&#39;t find dependent libraries) in a JNI project

I am having `HashMap` called `testMap` which contains `String, String`.

    HashMap&lt;String, String&gt; testMap = new HashMap&lt;String, String&gt;();

When iterating the map, if `value` is match with specified string, I need to remove the key from map.

i.e.

    for(Map.Entry&lt;String, String&gt; entry : testMap.entrySet()) {
      if(entry.getValue().equalsIgnoreCase(&quot;Sample&quot;)) {
        testMap.remove(entry.getKey());
      }
    }

`testMap` contains `&quot;Sample&quot;` but I am unable to remove the key from `HashMap`. &lt;br&gt;Instead getting error :

    &quot;Exception in thread &quot;main&quot; java.util.ConcurrentModificationException
    	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
    	at java.util.HashMap$EntryIterator.next(Unknown Source)
    	at java.util.HashMap$EntryIterator.next(Unknown Source)&quot;



How to remove a key from HashMap while iterating over it?

Is there a way to create an instance of a particular class given the class name (dynamic) and pass parameters to its constructor.

Something like:

    Object object = createInstance(&quot;mypackage.MyClass&quot;,&quot;MyAttributeValue&quot;);

Where `&quot;MyAttributeValue&quot;` is an argument to the constructor of `MyClass`.

Creating an instance using the class name and calling constructor

Although this question asked many times and I have already used all the suggestion but still I am getting this error.

The User.java is

    @Entity
	@Table(name = &quot;USER&quot;)
	public class User implements UserDetails, Serializable {
	
		private static final long serialVersionUID = 2L;
	
		@Id
		@Column(name = &quot;USER_ID&quot;)
		@GeneratedValue(strategy = GenerationType.IDENTITY)
		private long id;
		@Column(name = &quot;USERNAME&quot;)
		private String username;
		@Column(name = &quot;PASSWORD&quot;)
		private String password;
		@Column(name = &quot;NAME&quot;)
		private String name;
		@Column(name = &quot;EMAIL&quot;)
		private String email;
		@Column(name = &quot;LOCKED&quot;)
		private boolean locked;
		@OneToMany(cascade=CascadeType.ALL, fetch = FetchType.EAGER)
		@ElementCollection(targetClass=Role.class)
		@Column(name = &quot;ROLE_ID&quot;)
		private Set&lt;Role&gt; roles;
	
		@Override
		public GrantedAuthority[] getAuthorities() {
			List&lt;GrantedAuthorityImpl&gt; list = new ArrayList&lt;GrantedAuthorityImpl&gt;(0);
			for (Role role : roles) {
				list.add(new GrantedAuthorityImpl(role.getRole()));
			}
			return (GrantedAuthority[]) list.toArray(new GrantedAuthority[list.size()]);
		}
	
		@Override
		public boolean isAccountNonExpired() {
			return true;
		}
	
		@Override
		public boolean isAccountNonLocked() {
			return !isLocked();
		}
	
		@Override
		public boolean isCredentialsNonExpired() {
			return true;
		}
	
		@Override
		public boolean isEnabled() {
			return true;
		}
	
		public long getId() {
			return id;
		}
	
		public void setId(long id) {
			this.id = id;
		}
	
		public String getName() {
			return name;
		}
	
		public void setName(String name) {
			this.name = name;
		}
	
		public String getEmail() {
			return email;
		}
	
		public void setEmail(String email) {
			this.email = email;
		}
	
		public boolean isLocked() {
			return locked;
		}
	
		public void setLocked(boolean locked) {
			this.locked = locked;
		}
	
		@Override
		public String getUsername() {
			return username;
		}
	
		public void setUsername(String username) {
			this.username = username;
		}
	
		@Override
		public String getPassword() {
			return password;
		}
	
		public void setPassword(String password) {
			this.password = password;
		}
	
		public void setRoles(Set&lt;Role&gt; roles) {
			this.roles = roles;
		}
	
		public Set&lt;Role&gt; getRoles() {
			return roles;
		}
	}

And the Role.java is

    @Entity
	@Table(name=&quot;ROLE&quot;)
	public class Role implements Serializable {
	
		@Id
		@GeneratedValue(strategy = GenerationType.IDENTITY)
		@Column(name=&quot;ROLE_ID&quot;)
		private long id;
		@Column(name=&quot;USERNAME&quot;)
		private String username;
		@Column(name=&quot;ROLE&quot;)
		private String role;
	
		
		public long getId() {
			return id;
		}
	
		public void setId(long id) {
			this.id = id;
		}
	
		public String getUsername() {
			return username;
		}
	
		public void setUsername(String username) {
			this.username = username;
		}
	
		public String getRole() {
			return role;
		}
	
		public void setRole(String role) {
			this.role = role;
		}
	}

This is my first attempt in hibernate annotation with JPA. So any suggestions will be very helpful. 

For hibernate the pom.xml&#39;s dependencies are:

        &lt;dependency&gt;
			&lt;groupId&gt;org.hibernate&lt;/groupId&gt;
			&lt;artifactId&gt;hibernate&lt;/artifactId&gt;
			&lt;version&gt;3.5.4-Final&lt;/version&gt;
			&lt;type&gt;pom&lt;/type&gt;
			&lt;scope&gt;compile&lt;/scope&gt;
		&lt;/dependency&gt;
		&lt;dependency&gt;
			&lt;groupId&gt;org.hibernate&lt;/groupId&gt;
			&lt;artifactId&gt;hibernate-annotations&lt;/artifactId&gt;
			&lt;version&gt;3.5.4-Final&lt;/version&gt;
			&lt;type&gt;jar&lt;/type&gt;
			&lt;scope&gt;compile&lt;/scope&gt;
		&lt;/dependency&gt;
		
		&lt;dependency&gt;
			&lt;groupId&gt;org.hibernate&lt;/groupId&gt;
			&lt;artifactId&gt;hibernate-core&lt;/artifactId&gt;
			&lt;version&gt;3.5.4-Final&lt;/version&gt;
			&lt;type&gt;jar&lt;/type&gt;
			&lt;scope&gt;compile&lt;/scope&gt;
		&lt;/dependency&gt;
		&lt;dependency&gt;
			&lt;groupId&gt;org.hibernate&lt;/groupId&gt;
			&lt;artifactId&gt;hibernate-validator&lt;/artifactId&gt;
			&lt;version&gt;3.1.0.GA&lt;/version&gt;
			&lt;type&gt;jar&lt;/type&gt;
			&lt;scope&gt;compile&lt;/scope&gt;
		&lt;/dependency&gt;
		&lt;dependency&gt;
			&lt;groupId&gt;org.hibernate&lt;/groupId&gt;
			&lt;artifactId&gt;hibernate-entitymanager&lt;/artifactId&gt;
			&lt;version&gt;3.5.4-Final&lt;/version&gt;
			&lt;type&gt;jar&lt;/type&gt;
			&lt;scope&gt;compile&lt;/scope&gt;
		&lt;/dependency&gt;

I have no clue about the fault.

Thanks.

org.hibernate.MappingException: Could not determine type for: java.util.Set

I&#39;m using my uuid as following:

    @Id
	@GeneratedValue(generator = &quot;uuid&quot;)
	@GenericGenerator(name = &quot;uuid&quot;, strategy = &quot;uuid&quot;)
	@Column(name = &quot;uuid&quot;, unique = true)
	private String uuid;

but I&#39;m getting a smart Hibernate warning:

&gt; Using
&gt; org.hibernate.id.UUIDHexGenerator
&gt; which does not generate IETF RFC 4122
&gt; compliant UUID values; consider using
&gt; org.hibernate.id.UUIDGenerator instead

So I want to switch to `org.hibernate.id.UUIDGenerator`, now my question is how should I tell it to Hibernate&#39;s generator. I saw some guy used it as a &quot;hibernate-uuid&quot; - so this is what I&#39;ve tried, but with negative result:

    @Id
	@GeneratedValue(generator = &quot;hibernate-uuid&quot;)
	@GenericGenerator(name = &quot;hibernate-uuid&quot;, strategy = &quot;hibernate-uuid&quot;)
	@Column(name = &quot;uuid&quot;, unique = true)
	private String uuid;




Using Hibernate UUIDGenerator via annotations

I had successfully written my first master child example with hibernate. After few days I took it again and upgraded some libraries. No sure what did I do but I could never make it run again. Would somebody help my figure out what is wrong in code that is returning following error message:

    org.hibernate.PersistentObjectException: detached entity passed to persist: example.forms.InvoiceItem
    	at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:127)
    	at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:799)
    	at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:791)
    	.... (truncated)

hibernate mapping:

    &lt;hibernate-mapping package=&quot;example.forms&quot;&gt;
    	&lt;class name=&quot;Invoice&quot; table=&quot;Invoices&quot;&gt;
    		&lt;id name=&quot;id&quot; type=&quot;long&quot;&gt;
    			&lt;generator class=&quot;native&quot; /&gt;
    		&lt;/id&gt;
    		&lt;property name=&quot;invDate&quot; type=&quot;timestamp&quot; /&gt;
    		&lt;property name=&quot;customerId&quot; type=&quot;int&quot; /&gt;
    		&lt;set cascade=&quot;all&quot; inverse=&quot;true&quot; lazy=&quot;true&quot; name=&quot;items&quot; order-by=&quot;id&quot;&gt;
    			&lt;key column=&quot;invoiceId&quot; /&gt;
    			&lt;one-to-many class=&quot;InvoiceItem&quot; /&gt;
    		&lt;/set&gt;
    	&lt;/class&gt;
    	&lt;class name=&quot;InvoiceItem&quot; table=&quot;InvoiceItems&quot;&gt;
    		&lt;id column=&quot;id&quot; name=&quot;itemId&quot; type=&quot;long&quot;&gt;
    			&lt;generator class=&quot;native&quot; /&gt;
    		&lt;/id&gt;
    		&lt;property name=&quot;productId&quot; type=&quot;long&quot; /&gt;
    		&lt;property name=&quot;packname&quot; type=&quot;string&quot; /&gt;
    		&lt;property name=&quot;quantity&quot; type=&quot;int&quot; /&gt;
    		&lt;property name=&quot;price&quot; type=&quot;double&quot; /&gt;
    		&lt;many-to-one class=&quot;example.forms.Invoice&quot; column=&quot;invoiceId&quot; name=&quot;invoice&quot; not-null=&quot;true&quot; /&gt;
    	&lt;/class&gt;
    &lt;/hibernate-mapping&gt;
**EDIT:** InvoiceManager.java

    class InvoiceManager {
    
    	public Long save(Invoice theInvoice) throws RemoteException {
    		Session session = HbmUtils.getSessionFactory().getCurrentSession();
    		Transaction tx = null;
    		Long id = null;
    		try {
    			tx = session.beginTransaction();
    			session.persist(theInvoice);
    			tx.commit();
    			id = theInvoice.getId();
    		} catch (RuntimeException e) {
    			if (tx != null)
    				tx.rollback();
    			e.printStackTrace();
    			throw new RemoteException(&quot;Invoice could not be saved&quot;);
    		} finally {
    			if (session.isOpen())
    				session.close();
    		}
    		return id;
    	}
    
    	public Invoice getInvoice(Long cid) throws RemoteException {
    		Session session = HbmUtils.getSessionFactory().getCurrentSession();
    		Transaction tx = null;
    		Invoice theInvoice = null;
    		try {
    			tx = session.beginTransaction();
    			Query q = session
    					.createQuery(
    							&quot;from Invoice as invoice &quot; +
    							&quot;left join fetch invoice.items as invoiceItems &quot; +
    							&quot;where invoice.id = :id &quot;)
    					.setReadOnly(true);
    			q.setParameter(&quot;id&quot;, cid);
    			theInvoice = (Invoice) q.uniqueResult();
    			tx.commit();
    		} catch (RuntimeException e) {
    			tx.rollback();
    		} finally {
    			if (session.isOpen())
    				session.close();
    		}
    		return theInvoice;
    	}
    }

Invoice.java

    public class Invoice implements java.io.Serializable {
    
    	private Long id;
    	private Date invDate;
    	private int customerId;
    	private Set&lt;InvoiceItem&gt; items;
    
    	public Long getId() {
    		return id;
    	}
    
    	public Date getInvDate() {
    		return invDate;
    	}
    
    	public int getCustomerId() {
    		return customerId;
    	}
    
    	public Set&lt;InvoiceItem&gt; getItems() {
    		return items;
    	}
    
    	void setId(Long id) {
    		this.id = id;
    	}
    
    	void setInvDate(Date invDate) {
    		this.invDate = invDate;
    	}
    
    	void setCustomerId(int customerId) {
    		this.customerId = customerId;
    	}
    
    	void setItems(Set&lt;InvoiceItem&gt; items) {
    		this.items = items;
    	}
    }

InvoiceItem.java

    public class InvoiceItem implements java.io.Serializable {
    
    	private Long itemId;
    	private long productId;
    	private String packname;
    	private int quantity;
    	private double price;
    	private Invoice invoice;
    
    	public Long getItemId() {
    		return itemId;
    	}
    
    	public long getProductId() {
    		return productId;
    	}
    
    	public String getPackname() {
    		return packname;
    	}
    
    	public int getQuantity() {
    		return quantity;
    	}
    
    	public double getPrice() {
    		return price;
    	}
    
    	public Invoice getInvoice() {
    		return invoice;
    	}
    
    	void setItemId(Long itemId) {
    		this.itemId = itemId;
    	}
    
    	void setProductId(long productId) {
    		this.productId = productId;
    	}
    
    	void setPackname(String packname) {
    		this.packname = packname;
    	}
    
    	void setQuantity(int quantity) {
    		this.quantity = quantity;
    	}
    
    	void setPrice(double price) {
    		this.price = price;
    	}
    
    	void setInvoice(Invoice invoice) {
    		this.invoice = invoice;
    	}
    }
**EDIT:** JSON object sent from client:

    {&quot;id&quot;:null,&quot;customerId&quot;:3,&quot;invDate&quot;:&quot;2005-06-07T04:00:00.000Z&quot;,&quot;items&quot;:[
    {&quot;itemId&quot;:1,&quot;productId&quot;:1,&quot;quantity&quot;:10,&quot;price&quot;:100},
    {&quot;itemId&quot;:2,&quot;productId&quot;:2,&quot;quantity&quot;:20,&quot;price&quot;:200},
    {&quot;itemId&quot;:3,&quot;productId&quot;:3,&quot;quantity&quot;:30,&quot;price&quot;:300}]}

**EDIT:** Some details:  
I have tried to save invoice by following two ways:

 1. Manually fabricated above mentioned
    json object and passed it to fresh
    session of server. In this case absolutely 
    no activity has been made prior to calling 
    save method so there should not be any open session
    except the one opened in save method

 2. Loaded existing data by using
    getInvoice method and them passed same 
    data after removing key value. This too I believe
    should close the session before saving as
    transaction is being committed in getInvoice method.

In both cases I am getting same error message that is forcing me to believe that something is wrong either with hibernate configuration file or entity classes or save method.  
  
**Please let me know if I should provide more details**

org.hibernate.PersistentObjectException: detached entity passed to persist

Facing trouble in saving parent/child object with hibernate. Any idea would be highly appreciated.

    org.hibernate.PropertyValueException: not-null property references a null or transient value: example.forms.InvoiceItem.invoice
    	at org.hibernate.engine.Nullability.checkNullability(Nullability.java:100)
            .... (truncated)

hibernate mapping:

    &lt;hibernate-mapping package=&quot;example.forms&quot;&gt;
    	&lt;class name=&quot;Invoice&quot; table=&quot;Invoices&quot;&gt;
    		&lt;id name=&quot;id&quot; type=&quot;long&quot;&gt;
    			&lt;generator class=&quot;native&quot; /&gt;
    		&lt;/id&gt;
    		&lt;property name=&quot;invDate&quot; type=&quot;timestamp&quot; /&gt;
    		&lt;property name=&quot;customerId&quot; type=&quot;int&quot; /&gt;
    		&lt;set cascade=&quot;all&quot; inverse=&quot;true&quot; lazy=&quot;true&quot; name=&quot;items&quot; order-by=&quot;id&quot;&gt;
    			&lt;key column=&quot;invoiceId&quot; /&gt;
    			&lt;one-to-many class=&quot;InvoiceItem&quot; /&gt;
    		&lt;/set&gt;
    	&lt;/class&gt;
    	&lt;class name=&quot;InvoiceItem&quot; table=&quot;InvoiceItems&quot;&gt;
    		&lt;id column=&quot;id&quot; name=&quot;itemId&quot; type=&quot;long&quot;&gt;
    			&lt;generator class=&quot;native&quot; /&gt;
    		&lt;/id&gt;
    		&lt;property name=&quot;productId&quot; type=&quot;long&quot; /&gt;
    		&lt;property name=&quot;packname&quot; type=&quot;string&quot; /&gt;
    		&lt;property name=&quot;quantity&quot; type=&quot;int&quot; /&gt;
    		&lt;property name=&quot;price&quot; type=&quot;double&quot; /&gt;
    		&lt;many-to-one class=&quot;example.forms.Invoice&quot; column=&quot;invoiceId&quot; name=&quot;invoice&quot; not-null=&quot;true&quot; /&gt;
    	&lt;/class&gt;
    &lt;/hibernate-mapping&gt;
InvoiceManager.java

    class InvoiceManager {
    
    	public Long save(Invoice theInvoice) throws RemoteException {
    		Session session = HbmUtils.getSessionFactory().getCurrentSession();
    		Transaction tx = null;
    		Long id = null;
    		try {
    			tx = session.beginTransaction();
    			session.persist(theInvoice);
    			tx.commit();
    			id = theInvoice.getId();
    		} catch (RuntimeException e) {
    			if (tx != null)
    				tx.rollback();
    			e.printStackTrace();
    			throw new RemoteException(&quot;Invoice could not be saved&quot;);
    		} finally {
    			if (session.isOpen())
    				session.close();
    		}
    		return id;
    	}
    }

Invoice.java

    public class Invoice implements java.io.Serializable {
    	private Long id;
    	private Date invDate;
    	private int customerId;
    	private Set&lt;InvoiceItem&gt; items;
    
    	public Long getId() {
    		return id;
    	}
    	public Date getInvDate() {
    		return invDate;
    	}
    	public int getCustomerId() {
    		return customerId;
    	}
    	public Set&lt;InvoiceItem&gt; getItems() {
    		return items;
    	}
    	void setId(Long id) {
    		this.id = id;
    	}
    	void setInvDate(Date invDate) {
    		this.invDate = invDate;
    	}
    	void setCustomerId(int customerId) {
    		this.customerId = customerId;
    	}
    	void setItems(Set&lt;InvoiceItem&gt; items) {
    		this.items = items;
    	}
    }

InvoiceItem.java

    public class InvoiceItem implements java.io.Serializable {
    	private Long itemId;
    	private long productId;
    	private String packname;
    	private int quantity;
    	private double price;
    	private Invoice invoice;
    
    	public Long getItemId() {
    		return itemId;
    	}
    	public long getProductId() {
    		return productId;
    	}
    	public String getPackname() {
    		return packname;
    	}
    	public int getQuantity() {
    		return quantity;
    	}
    	public double getPrice() {
    		return price;
    	}
    	public Invoice getInvoice() {
    		return invoice;
    	}
    	void setItemId(Long itemId) {
    		this.itemId = itemId;
    	}
    	void setProductId(long productId) {
    		this.productId = productId;
    	}
    	void setPackname(String packname) {
    		this.packname = packname;
    	}
    	void setQuantity(int quantity) {
    		this.quantity = quantity;
    	}
    	void setPrice(double price) {
    		this.price = price;
    	}
    	void setInvoice(Invoice invoice) {
    		this.invoice = invoice;
    	}
    }


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I just saw that a beta of Hibernate 4 was released. What&#39;s new in 4 compared to 3(.6)? I couldn&#39;t find this info in the beta announcement, nor when Googling the title of this question.

Content Type	Original Author	Original Content on Stackoverflow
Question	user590444	View Question on Stackoverflow
Solution 1 - Java	dev4life	View Answer on Stackoverflow
Solution 2 - Java	hvgotcodes	View Answer on Stackoverflow
Solution 3 - Java	Venkata Naresh Babu	View Answer on Stackoverflow

What is difference between setMaxResults and setFetchSize in org.hibernate.Query?

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