A Collection of Errors and Solutions faced in Spring Development ( Java EE )

SPRING_E&S.md

😈 SPRING ERRORS and SOLUTIONS 😇

Error 😬

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.modelmapper.MappingException: ModelMapper mapping errors:

1) Converter org.modelmapper.internal.converter.CollectionConverter@9b93001 failed to convert java.util.List to java.util.List.

Solution 💚

 set modelMapper.getConfiguration().setAmbiguityIgnored(true);
 
 Ref - [Gist Thread](https://github.com/modelmapper/modelmapper/issues/239) 

Error 😬

java.lang.ClassCastException: org.hibernate.hql.internal.ast.tree.SqlNode cannot be cast to org.hibernate.hql.internal.ast.tree.FromReferenceNode

Solution 💚

 if package name starts with in means change to com(since in is reserved for IN India in Hibernate)

Error 😬

Error creating bean with name 'entityManagerFactory': Invocation of init method failed; nested exception is javax.naming.NameNotFoundException:
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available

Solution 💚

  Check weather ypu have defined persistence.xml

Error 😬

Error configuring application listener of class org.springframework.web.context.ContextLoaderListener

Solution 💚

  Add maven dependencies in the projects web deployment assembly 

Error 😬

StateTransferException: java.io.EOFException: Read past end of file 
                              (or)
Could not write method invocation failure for method public abstract XYX on bean named abcBean for appname  due to: java.io.NotSerializableException: xyzVo

Solution 💚

  Please Check xyzVo implements Serializable  

Error 😬

  Unable to locate appropriate constructor on class

Solution 💚

  Please Check for Constructer in the respective class and make sure it is in Public  

Error 😬

 javax.servlet.ServletException: Could not resolve view with name 'common_error' in servlet with name 'appServlet'

Solution 💚

  Please Check weather you have deployed latest war/ear or remove war/ear and redeploy  

Error 😬

java.lang.IllegalArgumentException :org.hibernate.QueryException :NOT ALL named parameters have been SET:[ username ]

Solution 💚

  Please Check for the parameters set for the query
  resultList.setParameter("username",username);  

Error 😬

  entityManager.merge(classname); runs Select instead of Update  
                         (or)
   Transactional Required : update or delete

Solution 💚

  Please Check for the @Transactional Annotation in Service Impl

Error 😬

  Hibernate - Batch update returned unexpected row count from update: 0 actual row count: 0 expected: 1

Solution 💚

  It also can happen when you tries to UPDATE a PRIMARY KEY.

Error 😬

  java.sql.SQLException Parameter index out of range (1 > number of parameters, which is 0) 

Solution 💚

  Please Check for Entity Class Weather all the Field names Given Correctly 
   @Column(name=" ' REGISTRATION_NO '") this also cause this error
	private String registrationNo;

Error 😬

  List view Not Sowing Properly in Production But works Perfect in Staging/Local

Solution 💚

  Please Check for the select Query, If it has Cross Joins without Condtions/AND Conditions then it Wont work in Production
  Remove unwanted cross joins or Add Conditions

Error 😬

errors.rejectValue("Class.studentName", "","Enter proper Student Name");  //Displays Error Messages as studentName Instead of  Enter proper Student Name

Solution 💚

 if error code is Empty then it looks for .Property File for the Correspondent field Class.studentName i.e Student Name if no correspondent file  found then it returns the default Message
 So use  errors.rejectValue("Class.studentName", "Class.studentName.errorMessage","Enter proper Student Name");
 In PropertiesFiles
     Class.studentName= studentName
     Class.studentName.errorMessage= Enter proper Student Name   refer interface MessageSource for more details

Error 😬

Not enough space to render crosstab

Solution 💚

 Check the Jasper Report for the CrossTab Table

Error 😬

 javax.persistence.TransactionRequiredException: Executing an update/delete query

Solution 💚

 for Every Add,Delete,Update Add this Annotation in ServivceImpl 
 @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class, readOnly = false)

Error 😬

 Servlet.service() for servlet XYZ threw exception: java.lang.OutOfMemoryError: PermGen space

Solution 💚

 Restart the Server to Clear the memory

Error 😬

Exception.ServiceException: : A different object with the same identifier value was already associated with the session

Solution 💚

 Entity With AutoIncrement Doesent Have a Annotaions @GeneratedValue(strategy = GenerationType.IDENTITY)

Error 😬

File is Out Of Sync.....

Solution 💚

 Clean and Refresh the project Files 

Error 😬

Break points Not Working Properyly.....

Solution 💚

 Check weather the App and Web Servers Runs in Debug Mode or Try CTRL+ALT+B in eclipse

Error 😬

 javax.resource.ResourceException: Could not create connection....
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 

Solution 💚

 Check the Data Base Connection (mostly happens  While Building War/Ear)

Error 😬

 Caused by: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data too long for column 'XYZ' at row 1

Solution 💚

 Length of submitted data is larger than the kength of the Field in DataBase.

Error 😬

 Neither BindingResult nor plain target object for bean name 'xyxBo' available as request attribute

Solution 💚

 Data is not available in DB/Data is Deleted for the Requsted Object in DataBase
                                  (or)
  Model View name is Incorrect