The [JPA repository section][1] query creation has the following methods.

    True	findByActiveTrue()	… where x.active = true
    False	findByActiveFalse()	… where x.active = false

My guess would be to use

    @Query
    public Iterable&lt;Entity&gt; findByEnabledTrue();


  [1]: https://docs.spring.io/spring-data/data-jpa/docs/current/reference/html/#jpa.query-methods.query-creation

The `@Query` anotation can even be skipped. So it should just work just like this:

    public Iterable&lt;Entity&gt; findByEnabledTrue();

In the video [AngularJS MTV Meetup: Best Practices (2012/12/11)][1], Miško explains &quot;..if you use ng-model there has to be a dot somewhere. If you don&#39;t have a dot, you&#39;re doing it wrong..&quot;

However, the very first example (The Basics) in the [Angular.JS website][2] seems to contradict it. What gives? Has Angular.JS changed since the MTV meetup that it&#39;s now more forgiving with ng-model?


  [1]: http://www.youtube.com/watch?feature=player_detailpage&amp;v=ZhfUv0spHCY#t=1758s
  [2]: http://angularjs.org/

Why don&#39;t the AngularJS docs use a dot in the model directive?

In python classes, the @property is a nice decorator that avoids using explicit setter and getter functions. However, it comes at a cost of an overhead 2-5 times that of a &quot;classical&quot; class function. In my case, this is quite OK in the case of setting a property, where the overhead is insignificant compared to the processing that needs to be done when setting. 

However, I need no processing when getting the property. It is always just &quot;return self.property&quot;. Is there an elegant way to use the setter but not using the getter, without needing to use a different internal variable?

Just to illustrate, the class below has the property &quot;var&quot; which refers to the internal variable &quot;_var&quot;. It takes longer to call &quot;var&quot; than &quot;_var&quot; but it would be nice if developers and users alike could just use &quot;var&quot; without having to keep track of &quot;_var&quot; too.

    class MyClass(object):
      def __init__(self):
        self._var = None
      
      # the property &quot;var&quot;. First the getter, then the setter
      @property
      def var(self):
        return self._var
      @var.setter
      def var(self, newValue):
        self._var = newValue
        #... and a lot of other stuff here
      
      # Use &quot;var&quot; a lot! How to avoid the overhead of the getter and not to call self._var!
      def useAttribute(self):
        for i in xrange(100000):
          self.var == &#39;something&#39;

For those interested, on my pc calling &quot;var&quot; takes 204 ns on average while calling &quot;_var&quot; takes 44 ns on average.

Python class @property: use setter but evade getter?

Is it possible to query by Boolean properties in Spring Data JPA without using method parameters?

Basically I would like this to work without using custom @Query annotation:

    @Query(&quot;SELECT c FROM Entity c WHERE c.enabled = true&quot;)
    public Iterable&lt;Entity&gt; findAllEnabled();



Query by Boolean properties in spring-data-jpa without using method parameters

Is it possible to query by Boolean properties in Spring Data JPA without using method parameters?
Basically I would like this to work without using custom @Query annotation:
<pre><code class="hljs language-csharp">@Query("SELECT c FROM Entity c WHERE c.enabled = true")
public Iterable&#x3C;Entity> findAllEnabled();
</code></pre>

I pointed the `JAVA_HOME` to `C:\Program Files (x86)\Java\jre7`. It works fine. Afterwards, I unzipped ant and set up the environment variables related to Ant, I got the following error messages after typing `&quot;ant -version&quot;`

 ![image][1]

  [1]: http://i.stack.imgur.com/CZc7p.png

I searched this forum. Looks like one solution is to point Java to JDK instead of JRE. I am not exactly sure whether this should be the solution. In other words, in general, which one should JAVA_HOME point to? JDK or JRE?

Should JAVA_HOME point to JDK or JRE?

What are all of the supported values for `@SuppressWarnings` in Android Studio?

I couldn&#39;t find any documentation on it, and I know it isn&#39;t the same as Eclipse because &quot;null&quot; doesn&#39;t work. You can catch null warnings with &quot;all&quot;, but as you can imagine I&#39;d rather not.

Supported @SuppressWarnings Values in Android Studio

Right now I have an instance of `org.fasterxml.jackson.databind.ObjectMapper` and would like to get a `String` with pretty JSON. All of the results of my Google searches have come up with Jackson 1.x ways of doing this and I can&#39;t seem to find the proper, non-deprecated way of doing this with 2.2. Even though I don&#39;t believe that code is absolutely necessary for this question, here&#39;s what I have right now:

    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(Include.NON_NULL);
    System.out.println(&quot;\n\n----------REQUEST-----------&quot;);
    StringWriter sw = new StringWriter();
    mapper.writeValue(sw, jsonObject);
    // Want pretty version of sw.toString() here

Pretty printing JSON from Jackson 2.2&#39;s ObjectMapper

I test the following DAO with JUnit:

    @Repository
    public class MyDao {

        @Autowired
        private SessionFactory sessionFactory;

        // Other stuff here

    }

As you can see, the sessionFactory is autowired using Spring. When I run the test, sessionFactory remains null and I get a null pointer exception.


This is the sessionFactory configuration in Spring:

	&lt;bean id=&quot;sessionFactory&quot;
		class=&quot;org.springframework.orm.hibernate3.LocalSessionFactoryBean&quot;&gt;
		&lt;property name=&quot;dataSource&quot; ref=&quot;dataSource&quot; /&gt;
		&lt;property name=&quot;configLocation&quot;&gt;
			&lt;value&gt;classpath:hibernate.cfg.xml&lt;/value&gt;
		&lt;/property&gt;
		&lt;property name=&quot;configurationClass&quot;&gt;
			&lt;value&gt;org.hibernate.cfg.AnnotationConfiguration&lt;/value&gt;
		&lt;/property&gt;
		&lt;property name=&quot;hibernateProperties&quot;&gt;
			&lt;props&gt;
				&lt;prop key=&quot;hibernate.dialect&quot;&gt;${jdbc.dialect}&lt;/prop&gt;
				&lt;prop key=&quot;hibernate.show_sql&quot;&gt;true&lt;/prop&gt;
			&lt;/props&gt;
		&lt;/property&gt;
	&lt;/bean&gt;

What&#39;s wrong? How can I enable autowiring for unit testings too?

Update: I don&#39;t know if it&#39;s the only way to run JUnit tests, but note that I&#39;m running it in Eclipse with right-clicking on the test file and selecting &quot;run as&quot;-&gt;&quot;JUnit test&quot;

Spring not autowiring in unit tests with JUnit

I have looked through previous questions, but none had the answer I was looking for.
How do I convert milliseconds from a StopWatch method to Minutes and Seconds?
I have:
   

     watch.start();

to start the stopwatch and
  

      watch.stop();

to stop the watch. I later have 
  

      watch.getTime();

which returns Milliseconds. I want it to return in Seconds and Minutes. How do I go about doing so? **I&#39;m looking for a way to do it without multiplying/dividing by 1000 but rather a method that will make the whole computation more readable and less error-prone.**


Converting Milliseconds to Minutes and Seconds?

In Spring CrudRepository, do we have support for &quot;IN clause&quot; for a field? ie something similar to the following? 


     findByInventoryIds(List&lt;Long&gt; inventoryIdList) 


If such support is not available, what elegant options can be considered? Firing queries for each id may not be optimal.

Spring CrudRepository findByInventoryIds(List&lt;Long&gt; inventoryIdList) - equivalent to IN clause

I have a table `Stuff` defined as...

    id, &lt;fields&gt;..., active

Active is the soft-delete flag and is always `1` or `0`. Long term this may go away in favor of a historical table.

    public interface StuffRepository extends JpaRepository&lt;StuffEntity, Long&gt; {} 

In code, we *always*  use active records. Is there any way to get Spring to always append an `active=1` condition to queries generated for this repository? Or more ideally allow me to extend the grammar used to generate the queries?

I understand that I can create named `@queues` everywhere but then I lose the convenience of the generated queries. I also want to avoid polluting the interface with &quot;active&quot; methods.

I am using Hibernate 4.2 as my JPA implementation if that matters.

Handling soft-deletes with Spring JPA

I try to make an application with Spring-Data-JPA on a table in order by ASC but it gives me an error:

    Invalid derived query! No property asc found for type java.util.Calendar

Why ?

    List&lt;Foo&gt; findAllOrderByDateAsc();

or

    @Query(&quot;SELECT * FROM foo ORDER BY date ASC&quot;)
	List&lt;Foo&gt; findAllOrderByDateAsc();

Order By Date ASC with Spring Data

I have a spring-mvc project that is using spring-data-jpa for data access. I have a domain object called ``Travel`` which I want to allow the end-user to apply a number of filters to it.

For that, I&#39;ve implemented the following controller:

    @Autowired
    private TravelRepository travelRep;
    
    @RequestMapping(&quot;/search&quot;)  
    public ModelAndView search(
            @RequestParam(required= false, defaultValue=&quot;&quot;) String lastName, 
            Pageable pageable) {  
    	ModelAndView mav = new ModelAndView(&quot;travels/list&quot;);  
    	Page&lt;Travel&gt; travels  = travelRep.findByLastNameLike(&quot;%&quot;+lastName+&quot;%&quot;, pageable);
    	PageWrapper&lt;Travel&gt; page = new PageWrapper&lt;Travel&gt;(travels, &quot;/search&quot;);
    	mav.addObject(&quot;page&quot;, page);
    	mav.addObject(&quot;lastName&quot;, lastName);
    	return mav;
    }

This works fine: The user has a form with a ``lastName`` input box which can be used to filter the Travels. 

Beyond lastName, my ``Travel`` domain object has a lot more attributes by which I&#39;d like to filter. I think that if these attributes were all strings then I could add them as ``@RequestParam``s and add a spring-data-jpa method to query by these. For instance I&#39;d add a method ``findByLastNameLikeAndFirstNameLikeAndShipNameLike``.


However, I don&#39;t know how should I do it when I need to filter for foreign keys. So my ``Travel`` has a ``period`` attribute that is a foreign key to the ``Period`` domain object, which I need to have it as a dropdown for the user to select the ``Period``. 

What I want to do is when the period is null I want to retrieve all travels filtered by the lastName and when the period is not null I want to retrieve all travels for this period filtered by the lastName. 

I know that this can be done if I implement two methods in my repository and use an ``if`` to my controller:

    public ModelAndView search(
           @RequestParam(required= false, defaultValue=&quot;&quot;) String lastName,
           @RequestParam(required= false, defaultValue=null) Period period, 
           Pageable pageable) {  
      ModelAndView mav = new ModelAndView(&quot;travels/list&quot;);  
      Page travels = null;
      if(period==null) {
        travels  = travelRep.findByLastNameLike(&quot;%&quot;+lastName+&quot;%&quot;, pageable);
      } else {
        travels  = travelRep.findByPeriodAndLastNameLike(period,&quot;%&quot;+lastName+&quot;%&quot;, pageable);
      }
      mav.addObject(&quot;page&quot;, page);
      mav.addObject(&quot;period&quot;, period);
      mav.addObject(&quot;lastName&quot;, lastName);
      return mav;
    }

Is there a way to do this *without* using the ``if`` ? My Travel has not only the period but also other attributes that need to be filtered using dropdowns !! As you can understand, the complexity would be exponentially increased when I need to use more dropdowns because all the combinations&#39;d need to be considered :(

&lt;b&gt;Update 03/12/13&lt;/b&gt;: Continuing from M. Deinum&#39;s excelent answer, and after actually implementing it, I&#39;d like to provide some comments for completeness of the question/asnwer:

1. Instead of implementing ``JpaSpecificationExecutor`` you should implement ``JpaSpecificationExecutor&lt;Travel&gt;`` to avoid type check warnings.

2. Please take a look at kostja&#39;s excellent answer to this question 
https://stackoverflow.com/questions/11138118/really-dynamic-jpa-criteriabuilder
since you *will* need to implement this if you want to have correct filters.

3. The best documentation I was able to find for the Criteria API was http://www.ibm.com/developerworks/library/j-typesafejpa/. This is a rather long read but I totally recommend it - after reading it most of my questions for Root&lt;T&gt; and CriteriaBuilder were answered :)

4. Reusing the ``Travel`` object was not possible because it contained various other objects (who also contained other objects) which I needed to search for using ``Like`` - instead I used a ``TravelSearch`` object that contained the fields I needed to search for.

&lt;b&gt;Update 10/05/15&lt;/b&gt;: As per @priyank&#39;s request, here&#39;s how I implemented the TravelSearch object:

    public class TravelSearch {
    	private String lastName;
    	private School school;
    	private Period period;
    	private String companyName;
    	private TravelTypeEnum travelType;
    	private TravelStatusEnum travelStatus;
        // Setters + Getters
    }

This object was used by TravelSpecification (most of the code is domain specific but I&#39;m leaving it there as an example):

    public class TravelSpecification implements Specification&lt;Travel&gt; {
    	private TravelSearch criteria;
    	
    
        public TravelSpecification(TravelSearch ts) {
        	criteria= ts;
        }
    	
    	@Override
    	public Predicate toPredicate(Root&lt;Travel&gt; root, CriteriaQuery&lt;?&gt; query, 
                CriteriaBuilder cb) {
    		Join&lt;Travel, Candidacy&gt; o = root.join(Travel_.candidacy);
    		
    		Path&lt;Candidacy&gt; candidacy = root.get(Travel_.candidacy);
    		Path&lt;Student&gt; student = candidacy.get(Candidacy_.student);
    		Path&lt;String&gt; lastName = student.get(Student_.lastName);
    		Path&lt;School&gt; school = student.get(Student_.school);
    		
    		Path&lt;Period&gt; period = candidacy.get(Candidacy_.period);
    		Path&lt;TravelStatusEnum&gt; travelStatus = root.get(Travel_.travelStatus);
    		Path&lt;TravelTypeEnum&gt; travelType = root.get(Travel_.travelType);
    		
    		Path&lt;Company&gt; company = root.get(Travel_.company);
    		Path&lt;String&gt; companyName = company.get(Company_.name);
    		
    		final List&lt;Predicate&gt; predicates = new ArrayList&lt;Predicate&gt;();
    		if(criteria.getSchool()!=null) {
    			predicates.add(cb.equal(school, criteria.getSchool()));
    		}
    		if(criteria.getCompanyName()!=null) {
    			predicates.add(cb.like(companyName, &quot;%&quot;+criteria.getCompanyName()+&quot;%&quot;));
    		}
    		if(criteria.getPeriod()!=null) {
    			predicates.add(cb.equal(period, criteria.getPeriod()));
    		}
    		if(criteria.getTravelStatus()!=null) {
    			predicates.add(cb.equal(travelStatus, criteria.getTravelStatus()));
    		}
    		if(criteria.getTravelType()!=null) {
    			predicates.add(cb.equal(travelType, criteria.getTravelType()));
    		}
    		if(criteria.getLastName()!=null ) {
    			predicates.add(cb.like(lastName, &quot;%&quot;+criteria.getLastName()+&quot;%&quot;));
    		}
    		return cb.and(predicates.toArray(new Predicate[predicates.size()]));
    		
    	}
    }

Finally, here&#39;s my search method:

    @RequestMapping(&quot;/search&quot;)  
    public ModelAndView search(
    		@ModelAttribute TravelSearch travelSearch,
    		Pageable pageable) {  
    	ModelAndView mav = new ModelAndView(&quot;travels/list&quot;);  
    
    	TravelSpecification tspec = new TravelSpecification(travelSearch);
    		
    	Page&lt;Travel&gt; travels  = travelRep.findAll(tspec, pageable);
    		
    	PageWrapper&lt;Travel&gt; page = new PageWrapper&lt;Travel&gt;(travels, &quot;/search&quot;);
    		
    	mav.addObject(travelSearch);
    		
    	mav.addObject(&quot;page&quot;, page);
    	mav.addObject(&quot;schools&quot;, schoolRep.findAll() );
    	mav.addObject(&quot;periods&quot;, periodRep.findAll() );
    	mav.addObject(&quot;travelTypes&quot;, TravelTypeEnum.values());
    	mav.addObject(&quot;travelStatuses&quot;, TravelStatusEnum.values());
    	return mav;
    }

Hope I helped!

Filtering database rows with spring-data-jpa and spring-mvc

Are you supposed to have one repository per table in JPA? If not, how do you resolve the generics in the repository database?

For example, below is a `StoreRepository`. It handles _CRUD_ operations on the `Store` object. If I wanted the repository to save a `StoreEvent` object as well, how would I go about changing the interface below to accommodate both objects?

    @Repository
    public interface StoreRepository extends JpaRepository&lt;Store, String&gt; {
        public Store findByGuid(String guid);
    }

Are you supposed to have one repository per table in JPA?

Well, I searched Google and found many results, but none of them was able to answer my problem. So, here it goes.

I am trying to study Spring MVC and Spring Data JPA by doing a minimal implementation of pinterest clone. So, following is the parts of code which I think is relevant to my problem.

**Models/Entities**

    @Entity
    @Table(name = &quot;pin_item&quot;)
    public class PinItem implements Serializable {
        // properties ...
        @JoinColumn(name = &quot;board_id&quot;, referencedColumnName = &quot;user_board_id&quot;)
        @ManyToOne(optional = false)
        private UserBoard board;

        // getters and setters...
    }

    @Entity
    @Table(name = &quot;user_board&quot;)
    public class UserBoard implements Serializable {
        // properties ...
        @OneToMany(cascade = CascadeType.ALL, mappedBy = &quot;board&quot;)
        private List&lt;PinItem&gt; pinItemList;

        // getters and setters...
    }

**Service**

    @Service
    @Transactional(readOnly = true)
    public class BoardServiceImpl implements BoardService {
        @Autowired
        private UserBoardRepository boardRepository;

        @Override
        public List&lt;UserBoard&gt; findLatestBoards() {
            PageRequest request = new PageRequest(
                         0, PresentationUtil.PAGE_SIZE, 
                         Sort.Direction.DESC, &quot;boardId&quot;
            );
            return boardRepository.findAll(request).getContent();
        }

        // Other Methods
    }

**Repository**

    public interface UserBoardRepository extends JpaRepository&lt;UserBoard, Integer&gt; {
        
    }

Now, when I call the `findLatestBoards` method in `BoardService`, &quot;No Property Found&quot; exception is thrown on the line `return boardRepository.findAll(request).getContent();`. Here is the excerpt from tomcat log.

**DEBUG LOG**

    12:28:44,254 DEBUG AnnotationTransactionAttributeSource:106 - Adding transactional method &#39;findLatestBoards&#39; with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; &#39;&#39;
    12:28:44,254 DEBUG DefaultListableBeanFactory:246 - Returning cached instance of singleton bean &#39;transactionManager&#39;
    12:28:44,254 DEBUG JpaTransactionManager:366 - Creating new transaction with name [com.tecnooc.picpin.service.impl.BoardServiceImpl.findLatestBoards]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; &#39;&#39;
    12:28:44,254 DEBUG JpaTransactionManager:369 - Opened new EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194] for JPA transaction
    12:28:44,255 DEBUG AbstractTransactionImpl:158 - begin
    12:28:44,255 DEBUG LogicalConnectionImpl:212 - Obtaining JDBC connection
    12:28:44,255 DEBUG DriverManagerDataSource:162 - Creating new JDBC DriverManager Connection to [jdbc:mysql://localhost:3306/pic_pin]
    12:28:44,266 DEBUG LogicalConnectionImpl:218 - Obtained JDBC connection
    12:28:44,267 DEBUG JdbcTransaction:69 - initial autocommit status: true
    12:28:44,267 DEBUG JdbcTransaction:71 - disabling autocommit
    12:28:44,267 DEBUG JpaTransactionManager:401 - Exposing JPA transaction as JDBC transaction [org.springframework.orm.jpa.vendor.HibernateJpaDialect$HibernateConnectionHandle@370da60e]
    12:28:44,274 DEBUG TransactionalRepositoryProxyPostProcessor$CustomAnnotationTransactionAttributeSource:286 - Adding transactional method &#39;findAll&#39; with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; &#39;&#39;
    12:28:44,274 DEBUG DefaultListableBeanFactory:246 - Returning cached instance of singleton bean &#39;transactionManager&#39;
    12:28:44,274 DEBUG JpaTransactionManager:332 - Found thread-bound EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194] for JPA transaction
    12:28:44,274 DEBUG JpaTransactionManager:471 - Participating in existing transaction
    12:28:44,279 DEBUG CachedIntrospectionResults:159 - Not strongly caching class [java.io.Serializable] because it is not cache-safe
    12:28:44,281 DEBUG JpaTransactionManager:851 - Participating transaction failed - marking existing transaction as rollback-only
    12:28:44,281 DEBUG JpaTransactionManager:559 - Setting JPA transaction on EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194] rollback-only
    12:28:44,283 DEBUG JpaTransactionManager:844 - Initiating transaction rollback
    12:28:44,284 DEBUG JpaTransactionManager:534 - Rolling back JPA transaction on EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194]
    12:28:44,284 DEBUG AbstractTransactionImpl:203 - rolling back
    12:28:44,284 DEBUG JdbcTransaction:164 - rolled JDBC Connection
    12:28:44,285 DEBUG JdbcTransaction:126 - re-enabling autocommit
    12:28:44,285 DEBUG JpaTransactionManager:594 - Closing JPA EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194] after transaction
    12:28:44,285 DEBUG EntityManagerFactoryUtils:338 - Closing JPA EntityManager
    12:28:44,286 DEBUG LogicalConnectionImpl:232 - Releasing JDBC connection
    12:28:44,286 DEBUG LogicalConnectionImpl:250 - Released JDBC connection
    12:28:44,287 DEBUG ExceptionHandlerExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.tecnooc.picpin.controller.BoardController.latest(javax.servlet.http.HttpSession,org.springframework.ui.Model)]: org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
    12:28:44,289 DEBUG ResponseStatusExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.tecnooc.picpin.controller.BoardController.latest(javax.servlet.http.HttpSession,org.springframework.ui.Model)]: org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
    12:28:44,290 DEBUG DefaultHandlerExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.tecnooc.picpin.controller.BoardController.latest(javax.servlet.http.HttpSession,org.springframework.ui.Model)]: org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
    12:28:44,291 DEBUG DispatcherServlet:959 - Could not complete request

**Exception**

The exception is &quot;`org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard`&quot;. But, if I understood correctly, the property `board` is present in `PinItem` and is correctly mapped with `mappedBy = &quot;board&quot;` in `UserBoard`.

    org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
        at org.springframework.data.mapping.PropertyPath.&lt;init&gt;(PropertyPath.java:75)
        at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:327)
        at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:353)
        at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:307)
        at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:271)
        at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:245)
        at org.springframework.data.jpa.repository.query.QueryUtils.toJpaOrder(QueryUtils.java:408)
        at org.springframework.data.jpa.repository.query.QueryUtils.toOrders(QueryUtils.java:372)
        at org.springframework.data.jpa.repository.support.SimpleJpaRepository.getQuery(SimpleJpaRepository.java:456)
        at org.springframework.data.jpa.repository.support.SimpleJpaRepository.getQuery(SimpleJpaRepository.java:437)
        at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:319)
        at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:289)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:333)
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:318)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.data.jpa.repository.support.LockModeRepositoryPostProcessor$LockModePopulatingMethodIntercceptor.invoke(LockModeRepositoryPostProcessor.java:92)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
        at com.sun.proxy.$Proxy147.findAll(Unknown Source)
        at com.tecnooc.picpin.service.impl.BoardServiceImpl.findLatestBoards(BoardServiceImpl.java:45)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
        at com.sun.proxy.$Proxy148.findLatestBoards(Unknown Source)
        at com.tecnooc.picpin.controller.BoardController.latest(BoardController.java:31)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:744)

I don&#39;t get why this exception is thrown. Any idea why it is happening?

**Note:** I am using Hibernate as Persistence provider. Also, the code portion I put here is what I thought is relevant to the problem. If it is not, let me know and I will update the question with required portion. 

Spring Data JPA - &quot;No Property Found for Type&quot; Exception


I want to write a query like `SELECT * FROM Release_date_type a LEFT JOIN cache_media b on a.id=b.id`. I am new to Spring Data JPA. I don&#39;t know how to write entities for Join query. Here is an attempt:

    @Entity
    @Table(name = &quot;Release_date_type&quot;)
    public class ReleaseDateType {
    
    	@Id
    	@GeneratedValue(strategy=GenerationType.TABLE)
    	private Integer release_date_type_id;
    	// ...
    	@Column(nullable = true) 
    	private Integer media_Id;
        // with getters and setters...
    }
    

 Another entity is: 

    @Entity
    @Table(name = &quot;Cache_Media&quot;)
    public class CacheMedia {
    
	    @Id
	    @GeneratedValue(strategy=GenerationType.TABLE)
    	private Integer id;
	    // ...
    	private Date loadDate; //with the getter and setter ..
    }

I want to write a `crudRepository` interface such as 

    public interface ReleaseDateTypeRepository extends CrudRepository&lt;ReleaseDateType, Long&gt;{
        @Query(&quot;SELECT * FROM Release_date_type a LEFT JOIN cache_media b on a.id=b.id&quot;)
        public List&lt;ReleaseDateType&gt; FindAllWithDescriptionQuery();
    }

Content Type	Original Author	Original Content on Stackoverflow
Question	Mike Minicki	View Question on Stackoverflow
Solution 1 - Java	orangegoat	View Answer on Stackoverflow
Solution 2 - Java	megalucio	View Answer on Stackoverflow

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