Null pointer exception is thrown when USING DEPENDENCY INJECTION in Service layer. The DAO class bean is NULL
Question
I am using Struts, hibernate. The project was working fine. Now, I used dependency injection gor creating the dao object in service layer. It isnt working. Please tell me what has gone wrong here.
<!-- properties declares that the contained properties form an alternate key. The name
attribute allows an alternate key to be used as the target of a property-ref. -->
<!ELEMENT properties (
(property|many-to-one|component|dynamic-component)*
)>
<!ATTLIST properties name CDATA #REQUIRED>
<!ATTLIST properties unique (true|false) "false">
<!ATTLIST properties insert (true|false) "true">
<!ATTLIST properties update (true|false) "true">
<!ATTLIST properties optimistic-lock (true|false) "true">
<!ATTLIST properties node CDATA #IMPLIED>
<!-- The parent element maps a property of the component class as a pointer back to
the owning entity. -->
<!ELEMENT parent EMPTY>
<!ATTLIST parent name CDATA #REQUIRED>
<!-- Collection declarations nested inside a class declaration indicate a foreign key
relationship from the collection table to the enclosing class. -->
<!ELEMENT map (
meta*,
subselect?,
cache?,
synchronize*,
comment?,
key,
(map-key|composite-map-key|map-key-many-to-many|index|composite-index|index-many-to-many|index-many-to-any),
(element|one-to-many|many-to-many|composite-element|many-to-any),
loader?,sql-insert?,sql-update?,sql-delete?,sql-delete-all?,
filter*
)>
<!ATTLIST map name CDATA #REQUIRED>
<!ATTLIST map access CDATA #IMPLIED>
<!ATTLIST map table CDATA #IMPLIED> <!-- default: name -->
<!ATTLIST map schema CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST map subselect CDATA #IMPLIED>
<!ATTLIST map catalog CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST map lazy (true|false|extra) #IMPLIED>
<!ATTLIST map mutable (true|false) "true">
<!ATTLIST map inverse (true|false) "false">
<!ATTLIST map sort CDATA "unsorted"> <!-- unsorted|natural|"comparator class", default: unsorted -->
<!ATTLIST map cascade CDATA #IMPLIED>
<!ATTLIST map order-by CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST map where CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST map batch-size CDATA #IMPLIED>
<!ATTLIST map outer-join (true|false|auto) #IMPLIED>
<!ATTLIST map fetch (join|select|subselect) #IMPLIED>
<!ATTLIST map check CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST map persister CDATA #IMPLIED>
<!ATTLIST map collection-type CDATA #IMPLIED>
<!ATTLIST map optimistic-lock (true|false) "true"> <!-- only supported for properties of a class (not component) -->
<!ATTLIST map node CDATA #IMPLIED>
<!ATTLIST map embed-xml (true|false) "true">
<!ELEMENT set (
meta*,
subselect?,
cache?,
synchronize*,
comment?,
key,
(element|one-to-many|many-to-many|composite-element|many-to-any),
loader?,sql-insert?,sql-update?,sql-delete?,sql-delete-all?,
filter*
)>
<!ATTLIST set name CDATA #REQUIRED>
<!ATTLIST set access CDATA #IMPLIED>
<!ATTLIST set table CDATA #IMPLIED> <!-- default: name -->
<!ATTLIST set schema CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST set catalog CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST set subselect CDATA #IMPLIED>
<!ATTLIST set lazy (true|false|extra) #IMPLIED>
<!ATTLIST set sort CDATA "unsorted"> <!-- unsorted|natural|"comparator class" -->
<!ATTLIST set inverse (true|false) "false">
<!ATTLIST set mutable (true|false) "true">
<!ATTLIST set cascade CDATA #IMPLIED>
<!ATTLIST set order-by CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST set where CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST set batch-size CDATA #IMPLIED>
<!ATTLIST set outer-join (true|false|auto) #IMPLIED>
<!ATTLIST set fetch (join|select|subselect) #IMPLIED>
<!ATTLIST set persister CDATA #IMPLIED>
<!ATTLIST set collection-type CDATA #IMPLIED>
<!ATTLIST set check CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST set optimistic-lock (true|false) "true"> <!-- only supported for properties of a class (not component) -->
<!ATTLIST set node CDATA #IMPLIED>
<!ATTLIST set embed-xml (true|false) "true">
<!ELEMENT bag (
meta*,
subselect?,
cache?,
synchronize*,
comment?,
key,
(element|one-to-many|many-to-many|composite-element|many-to-any),
loader?,sql-insert?,sql-update?,sql-delete?,sql-delete-all?,
filter*
)>
<!ATTLIST bag name CDATA #REQUIRED>
<!ATTLIST bag access CDATA #IMPLIED>
<!ATTLIST bag table CDATA #IMPLIED> <!-- default: name -->
<!ATTLIST bag schema CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST bag catalog CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST bag subselect CDATA #IMPLIED>
<!ATTLIST bag lazy (true|false|extra) #IMPLIED>
<!ATTLIST bag inverse (true|false) "false">
<!ATTLIST bag mutable (true|false) "true">
<!ATTLIST bag cascade CDATA #IMPLIED>
<!ATTLIST bag order-by CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST bag where CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST bag batch-size CDATA #IMPLIED>
<!ATTLIST bag outer-join (true|false|auto) #IMPLIED>
<!ATTLIST bag fetch (join|select|subselect) #IMPLIED>
<!ATTLIST bag persister CDATA #IMPLIED>
<!ATTLIST bag collection-type CDATA #IMPLIED>
<!ATTLIST bag check CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST bag optimistic-lock (true|false) "true"> <!-- only supported for properties of a class (not component) -->
<!ATTLIST bag node CDATA #IMPLIED>
<!ATTLIST bag embed-xml (true|false) "true">
<!ELEMENT idbag (
meta*,
subselect?,
cache?,
synchronize*,
comment?,
collection-id,
key,
(element|many-to-many|composite-element|many-to-any),
loader?,sql-insert?,sql-update?,sql-delete?,sql-delete-all?,
filter*
)>
<!ATTLIST idbag name CDATA #REQUIRED>
<!ATTLIST idbag access CDATA #IMPLIED>
<!ATTLIST idbag table CDATA #IMPLIED> <!-- default: name -->
<!ATTLIST idbag schema CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST idbag catalog CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST idbag subselect CDATA #IMPLIED>
<!ATTLIST idbag lazy (true|false|extra) #IMPLIED>
<!ATTLIST idbag mutable (true|false) "true">
<!ATTLIST idbag cascade CDATA #IMPLIED>
<!ATTLIST idbag order-by CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST idbag where CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST idbag batch-size CDATA #IMPLIED>
<!ATTLIST idbag outer-join (true|false|auto) #IMPLIED>
<!ATTLIST idbag fetch (join|select|subselect) #IMPLIED>
<!ATTLIST idbag persister CDATA #IMPLIED>
<!ATTLIST idbag collection-type CDATA #IMPLIED>
<!ATTLIST idbag check CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST idbag optimistic-lock (true|false) "true"> <!-- only supported for properties of a class (not component) -->
<!ATTLIST idbag node CDATA #IMPLIED>
<!ATTLIST idbag embed-xml (true|false) "true">
<!ELEMENT list (
meta*,
subselect?,
cache?,
synchronize*,
comment?,
key,
(index|list-index),
(element|one-to-many|many-to-many|composite-element|many-to-any),
loader?,sql-insert?,sql-update?,sql-delete?,sql-delete-all?,
filter*
)>
<!ATTLIST list name CDATA #REQUIRED>
<!ATTLIST list access CDATA #IMPLIED>
<!ATTLIST list table CDATA #IMPLIED> <!-- default: name -->
<!ATTLIST list schema CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST list catalog CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST list subselect CDATA #IMPLIED>
<!ATTLIST list lazy (true|false|extra) #IMPLIED>
<!ATTLIST list inverse (true|false) "false">
<!ATTLIST list mutable (true|false) "true">
<!ATTLIST list cascade CDATA #IMPLIED>
<!ATTLIST list where CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST list batch-size CDATA #IMPLIED>
<!ATTLIST list outer-join (true|false|auto) #IMPLIED>
<!ATTLIST list fetch (join|select|subselect) #IMPLIED>
<!ATTLIST list persister CDATA #IMPLIED>
<!ATTLIST list collection-type CDATA #IMPLIED>
<!ATTLIST list check CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST list optimistic-lock (true|false) "true"> <!-- only supported for properties of a class (not component) -->
<!ATTLIST list node CDATA #IMPLIED>
<!ATTLIST list embed-xml (true|false) "true">
<!ELEMENT array (
meta*,
subselect?,
cache?,
synchronize*,
comment?,
key,
(index|list-index),
(element|one-to-many|many-to-many|composite-element|many-to-any),
loader?,sql-insert?,sql-update?,sql-delete?,sql-delete-all?
)>
<!ATTLIST array name CDATA #REQUIRED>
<!ATTLIST array access CDATA #IMPLIED>
<!ATTLIST array table CDATA #IMPLIED> <!-- default: name -->
<!ATTLIST array schema CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST array catalog CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST array subselect CDATA #IMPLIED>
<!ATTLIST array inverse (true|false) "false">
<!ATTLIST array mutable (true|false) "true">
<!ATTLIST array element-class CDATA #IMPLIED>
<!ATTLIST array cascade CDATA #IMPLIED>
<!ATTLIST array where CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST array batch-size CDATA #IMPLIED>
<!ATTLIST array outer-join (true|false|auto) #IMPLIED>
<!ATTLIST array fetch (join|select|subselect) #IMPLIED>
<!ATTLIST array persister CDATA #IMPLIED>
<!ATTLIST array collection-type CDATA #IMPLIED>
<!ATTLIST array check CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST array optimistic-lock (true|false) "true"> <!-- only supported for properties of a class (not component) -->
<!ATTLIST array node CDATA #IMPLIED>
<!ATTLIST array embed-xml (true|false) "true">
<!ELEMENT primitive-array (
meta*,
subselect?,
cache?,
synchronize*,
comment?,
key,
(index|list-index),
element,
loader?,sql-insert?,sql-update?,sql-delete?,sql-delete-all?
)>
<!ATTLIST primitive-array name CDATA #REQUIRED>
<!ATTLIST primitive-array access CDATA #IMPLIED>
<!ATTLIST primitive-array table CDATA #IMPLIED> <!-- default: name -->
<!ATTLIST primitive-array schema CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST primitive-array catalog CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST primitive-array subselect CDATA #IMPLIED>
<!ATTLIST primitive-array mutable (true|false) "true">
<!ATTLIST primitive-array where CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST primitive-array batch-size CDATA #IMPLIED>
<!ATTLIST primitive-array outer-join (true|false|auto) #IMPLIED>
<!ATTLIST primitive-array fetch (join|select|subselect) #IMPLIED>
<!ATTLIST primitive-array persister CDATA #IMPLIED>
<!ATTLIST primitive-array collection-type CDATA #IMPLIED>
<!ATTLIST primitive-array check CDATA #IMPLIED> <!-- default: none -->
<!ATTLIST primitive-array optimistic-lock (true|false) "true"> <!-- only supported for properties of a class (not component) -->
<!ATTLIST primitive-array node CDATA #IMPLIED>
<!ATTLIST primitive-array embed-xml (true|false) "true">
<!-- Declares the element type of a collection of basic type -->
<!ELEMENT element ( (column|formula)*, type? )>
<!ATTLIST element column CDATA #IMPLIED>
<!ATTLIST element node CDATA #IMPLIED>
<!ATTLIST element formula CDATA #IMPLIED>
<!ATTLIST element type CDATA #IMPLIED>
<!ATTLIST element length CDATA #IMPLIED>
<!ATTLIST element precision CDATA #IMPLIED>
<!ATTLIST element scale CDATA #IMPLIED>
<!ATTLIST element not-null (true|false) "false">
<!ATTLIST element unique (true|false) "false">
<!-- One to many association. This tag declares the entity-class
element type of a collection and specifies a one-to-many relational model -->
<!ELEMENT one-to-many EMPTY>
<!ATTLIST one-to-many class CDATA #IMPLIED>
<!ATTLIST one-to-many not-found (exception|ignore) "exception">
<!ATTLIST one-to-many node CDATA #IMPLIED>
<!ATTLIST one-to-many embed-xml (true|false) "true">
<!ATTLIST one-to-many entity-name CDATA #IMPLIED>
<!-- No column declaration attributes required in this case. The primary
key column of the associated class is already mapped elsewhere.-->
<!-- Many to many association. This tag declares the entity-class
element type of a collection and specifies a many-to-many relational model -->
<!ELEMENT many-to-many (meta*,(column|formula)*,filter*)>
<!ATTLIST many-to-many class CDATA #IMPLIED>
<!ATTLIST many-to-many node CDATA #IMPLIED>
<!ATTLIST many-to-many embed-xml (true|false) "true">
<!ATTLIST many-to-many entity-name CDATA #IMPLIED>
<!ATTLIST many-to-many column CDATA #IMPLIED>
<!ATTLIST many-to-many formula CDATA #IMPLIED>
<!ATTLIST many-to-many not-found (exception|ignore) "exception">
<!ATTLIST many-to-many outer-join (true|false|auto) #IMPLIED>
<!ATTLIST many-to-many fetch (join|select) #IMPLIED>
<!ATTLIST many-to-many lazy (false|proxy) #IMPLIED>
<!ATTLIST many-to-many foreign-key CDATA #IMPLIED>
<!ATTLIST many-to-many unique (true|false) "false">
<!ATTLIST many-to-many where CDATA #IMPLIED>
<!ATTLIST many-to-many order-by CDATA #IMPLIED>
<!ATTLIST many-to-many property-ref CDATA #IMPLIED>
<!-- A composite element allows a collection to hold instances of an arbitrary
class, without the requirement of joining to an entity table. Composite elements
have component semantics - no shared references and ad hoc null value semantics.
Composite elements may not hold nested collections. -->
<!ELEMENT composite-element (
(meta*),
parent?,
tuplizer*,
(property|many-to-one|any|nested-composite-element)*
)>
<!ATTLIST composite-element class CDATA #REQUIRED>
<!ATTLIST composite-element node CDATA #IMPLIED>
<!ELEMENT nested-composite-element (
parent?,
tuplizer*,
(property|many-to-one|any|nested-composite-element)*
)>
<!ATTLIST nested-composite-element class CDATA #REQUIRED>
<!ATTLIST nested-composite-element name CDATA #REQUIRED>
<!ATTLIST nested-composite-element access CDATA #IMPLIED>
<!ATTLIST nested-composite-element node CDATA #IMPLIED>
<!-- Declares the column name of a foreign key. -->
<!ELEMENT key (column*)>
<!ATTLIST key column CDATA #IMPLIED>
<!ATTLIST key property-ref CDATA #IMPLIED>
<!ATTLIST key foreign-key CDATA #IMPLIED>
<!ATTLIST key on-delete (cascade|noaction) "noaction">
<!ATTLIST key not-null (true|false) #IMPLIED>
<!ATTLIST key update (true|false) #IMPLIED>
<!ATTLIST key unique (true|false) #IMPLIED>
<!-- Declares the type and column mapping for a collection index (array or
list index, or key of a map). -->
<!ELEMENT list-index (column?)>
<!ATTLIST list-index column CDATA #IMPLIED>
<!ATTLIST list-index base CDATA "0">
<!ELEMENT map-key ((column|formula)*,type?)>
<!ATTLIST map-key column CDATA #IMPLIED>
<!ATTLIST map-key formula CDATA #IMPLIED>
<!ATTLIST map-key type CDATA #IMPLIED>
<!ATTLIST map-key length CDATA #IMPLIED>
<!ATTLIST map-key node CDATA #IMPLIED>
<!ELEMENT index (column*)>
<!ATTLIST index column CDATA #IMPLIED>
<!ATTLIST index type CDATA #IMPLIED> <!-- required for maps -->
<!ATTLIST index length CDATA #IMPLIED>
<!-- Many to many association mapped to the key of a map. ie. a map keyed
on entities. -->
<!ELEMENT map-key-many-to-many ((column|formula)*)>
<!ATTLIST map-key-many-to-many class CDATA #IMPLIED>
<!ATTLIST map-key-many-to-many entity-name CDATA #IMPLIED>
<!ATTLIST map-key-many-to-many column CDATA #IMPLIED>
<!ATTLIST map-key-many-to-many formula CDATA #IMPLIED>
<!ATTLIST map-key-many-to-many foreign-key CDATA #IMPLIED>
<!ELEMENT index-many-to-many (column*)>
<!ATTLIST index-many-to-many class CDATA #REQUIRED>
<!ATTLIST index-many-to-many entity-name CDATA #IMPLIED>
<!ATTLIST index-many-to-many column CDATA #IMPLIED>
<!ATTLIST index-many-to-many foreign-key CDATA #IMPLIED>
<!-- Composite index of a map ie. a map keyed on components. -->
<!ELEMENT composite-map-key ( (key-property|key-many-to-one)+ )>
<!ATTLIST composite-map-key class CDATA #REQUIRED>
<!ELEMENT composite-index ( (key-property|key-many-to-one)+ )>
<!ATTLIST composite-index class CDATA #REQUIRED>
<!-- A "many to any" defines a polymorphic association to any table
with the given identifier type. The first listed column is a VARCHAR column
holding the name of the class (for that row). -->
<!ELEMENT many-to-any (meta-value*,column, column+)>
<!ATTLIST many-to-any id-type CDATA #REQUIRED>
<!ATTLIST many-to-any meta-type CDATA #IMPLIED> <!--- default: Hibernate.CLASS -->
<!ELEMENT index-many-to-any (column, column+)>
<!ATTLIST index-many-to-any id-type CDATA #REQUIRED>
<!ATTLIST index-many-to-any meta-type CDATA #IMPLIED> <!--- default: Hibernate.CLASS -->
<!ELEMENT collection-id (meta*, column*, generator)>
<!ATTLIST collection-id column CDATA #REQUIRED>
<!ATTLIST collection-id type CDATA #REQUIRED>
<!ATTLIST collection-id length CDATA #IMPLIED>
<!-- Generators generate unique identifiers. The class attribute specifies a Java
class implementing an id generation algorithm. -->
<!ELEMENT generator (param*)>
<!ATTLIST generator class CDATA #REQUIRED>
<!ELEMENT param (#PCDATA)>
<!ATTLIST param name CDATA #REQUIRED>
<!-- The column element is an alternative to column attributes and required for
mapping associations to classes with composite ids. -->
<!ELEMENT column (comment?)>
<!ATTLIST column name CDATA #REQUIRED>
<!ATTLIST column length CDATA #IMPLIED> <!-- default: 255 -->
<!ATTLIST column precision CDATA #IMPLIED>
<!ATTLIST column scale CDATA #IMPLIED>
<!ATTLIST column not-null (true|false) #IMPLIED> <!-- default: false (except for id properties) -->
<!ATTLIST column unique (true|false) #IMPLIED> <!-- default: false (except for id properties) -->
<!ATTLIST column unique-key CDATA #IMPLIED> <!-- default: no unique key -->
<!ATTLIST column sql-type CDATA #IMPLIED> <!-- override default column type for hibernate type -->
<!ATTLIST column index CDATA #IMPLIED>
<!ATTLIST column check CDATA #IMPLIED> <!-- default: no check constraint -->
<!ATTLIST column default CDATA #IMPLIED> <!-- default: no default value -->
<!ATTLIST column read CDATA #IMPLIED> <!-- default: column name -->
<!ATTLIST column write CDATA #IMPLIED> <!-- default: parameter placeholder ('?') -->
<!-- The formula and subselect elements allow us to map derived properties and
entities. -->
<!ELEMENT formula (#PCDATA)>
<!ELEMENT subselect (#PCDATA)>
<!-- The cache element enables caching of an entity class. -->
<!ELEMENT cache EMPTY>
<!ATTLIST cache usage (read-only|read-write|nonstrict-read-write|transactional) #REQUIRED>
<!ATTLIST cache region CDATA #IMPLIED> <!-- default: class or collection role name -->
<!ATTLIST cache include (all|non-lazy) "all">
<!-- The comment element allows definition of a database table or column comment. -->
<!ELEMENT comment (#PCDATA)>
<!-- The loader element allows specification of a named query to be used for fetching
an entity or collection -->
<!ELEMENT loader EMPTY>
<!ATTLIST loader query-ref CDATA #REQUIRED>
<!-- The query element declares a named Hibernate query string -->
<!ELEMENT query (#PCDATA|query-param)*>
<!ATTLIST query name CDATA #REQUIRED>
<!ATTLIST query flush-mode (auto|never|always) #IMPLIED>
<!ATTLIST query cacheable (true|false) "false">
<!ATTLIST query cache-region CDATA #IMPLIED>
<!ATTLIST query fetch-size CDATA #IMPLIED>
<!ATTLIST query timeout CDATA #IMPLIED>
<!ATTLIST query cache-mode (get|ignore|normal|put|refresh) #IMPLIED>
<!ATTLIST query read-only (true|false) #IMPLIED>
<!ATTLIST query comment CDATA #IMPLIED>
<!-- The sql-query element declares a named SQL query string -->
<!ELEMENT sql-query (#PCDATA|return-scalar|return|return-join|load-collection|synchronize|query-param)*>
<!ATTLIST sql-query name CDATA #REQUIRED>
<!ATTLIST sql-query resultset-ref CDATA #IMPLIED>
<!ATTLIST sql-query flush-mode (auto|never|always) #IMPLIED>
<!ATTLIST sql-query cacheable (true|false) "false">
<!ATTLIST sql-query cache-region CDATA #IMPLIED>
<!ATTLIST sql-query fetch-size CDATA #IMPLIED>
<!ATTLIST sql-query timeout CDATA #IMPLIED>
<!ATTLIST sql-query cache-mode (get|ignore|normal|put|refresh) #IMPLIED>
<!ATTLIST sql-query read-only (true|false) #IMPLIED>
<!ATTLIST sql-query comment CDATA #IMPLIED>
<!ATTLIST sql-query callable (true|false) "false">
<!-- The query-param element is used only by tools that generate
finder methods for named queries -->
<!ELEMENT query-param EMPTY>
<!ATTLIST query-param name CDATA #REQUIRED>
<!ATTLIST query-param type CDATA #REQUIRED>
<!-- The resultset element declares a named resultset mapping definition for SQL queries -->
<!ELEMENT resultset (return-scalar|return|return-join|load-collection)*>
<!ATTLIST resultset name CDATA #REQUIRED>
<!--
Defines a return component for a sql-query. Alias refers to the alias
used in the actual sql query; lock-mode specifies the locking to be applied
when the query is executed. The class, collection, and role attributes are mutually exclusive;
class refers to the class name of a "root entity" in the object result; collection refers
to a collection of a given class and is used to define custom sql to load that owned collection
and takes the form "ClassName.propertyName"; role refers to the property path for an eager fetch
and takes the form "owningAlias.propertyName"
-->
<!ELEMENT return (return-discriminator?,return-property)*>
<!ATTLIST return alias CDATA #IMPLIED>
<!ATTLIST return entity-name CDATA #IMPLIED>
<!ATTLIST return class CDATA #IMPLIED>
<!ATTLIST return lock-mode (none|read|upgrade|upgrade-nowait|write) "read">
<!ELEMENT return-property (return-column*)>
<!ATTLIST return-property name CDATA #REQUIRED>
<!ATTLIST return-property column CDATA #IMPLIED>
<!ELEMENT return-column EMPTY>
<!ATTLIST return-column name CDATA #REQUIRED>
<!ELEMENT return-discriminator EMPTY>
<!ATTLIST return-discriminator column CDATA #REQUIRED>
<!ELEMENT return-join (return-property)*>
<!ATTLIST return-join alias CDATA #REQUIRED>
<!ATTLIST return-join property CDATA #REQUIRED>
<!ATTLIST return-join lock-mode (none|read|upgrade|upgrade-nowait|write) "read">
<!ELEMENT load-collection (return-property)*>
<!ATTLIST load-collection alias CDATA #REQUIRED>
<!ATTLIST load-collection role CDATA #REQUIRED>
<!ATTLIST load-collection lock-mode (none|read|upgrade|upgrade-nowait|write) "read">
<!ELEMENT return-scalar EMPTY>
<!ATTLIST return-scalar column CDATA #REQUIRED>
<!ATTLIST return-scalar type CDATA #IMPLIED>
<!ELEMENT synchronize EMPTY>
<!ATTLIST synchronize table CDATA #REQUIRED>
<!-- custom sql operations -->
<!ELEMENT sql-insert (#PCDATA)>
<!ATTLIST sql-insert callable (true|false) "false">
<!ATTLIST sql-insert check (none|rowcount|param) #IMPLIED>
<!ELEMENT sql-update (#PCDATA)>
<!ATTLIST sql-update callable (true|false) "false">
<!ATTLIST sql-update check (none|rowcount|param) #IMPLIED>
<!ELEMENT sql-delete (#PCDATA)>
<!ATTLIST sql-delete callable (true|false) "false">
<!ATTLIST sql-delete check (none|rowcount|param) #IMPLIED>
<!ELEMENT sql-delete-all (#PCDATA)>
<!ATTLIST sql-delete-all callable (true|false) "false">
<!ATTLIST sql-delete-all check (none|rowcount|param) #IMPLIED>
<!--
Element for defining "auxiliary" database objects. Must be one of two forms:
#1 :
<database-object>
<definition class="CustomClassExtendingAuxiliaryObject"/>
</database-object>
#2 :
<database-object>
<create>CREATE OR REPLACE ....</create>
<drop>DROP ....</drop>
</database-object>
-->
<!ELEMENT database-object ( (definition|(create,drop)), dialect-scope* )>
<!ELEMENT definition EMPTY>
<!ATTLIST definition class CDATA #REQUIRED>
<!ELEMENT create (#PCDATA)>
<!ELEMENT drop (#PCDATA)>
<!--
dialect-scope element allows scoping auxiliary-objects to a particular
Hibernate dialect implementation.
-->
<!ELEMENT dialect-scope (#PCDATA)>
<!ATTLIST dialect-scope name CDATA #REQUIRED>
I am using Struts, hibernate. The project was working fine. Now, I used dependency injection gor creating the dao object in service layer. It isnt working. Please tell me what has gone wrong here.
2 answers
solution1
0 2016-06-23 10:24:46
You need to start the Spring Container by enabling the ContextLoaderListener in your web.xml:
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
solution2
0 2016-06-23 10:31:40
Add below listener in web.xml
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
In LeaveService.java, add below constructor: Spring while creating bean for LeaveService, it will call below constructor and will set the value for field leaveDAO
LeaveService(LeaveDAO leaveDAO ){
this.leaveDAO = leaveDAO ;
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
sessionFactory bean : null pointer exception while using setter injection
Null Pointer Exception - Dependency Injection - Google Guice
Null pointer exception thrown in Autowired service class when I used JWT Authentication
Null Pointer Exception Thrown
How to resolve Null pointer exception while invoke the driver instance fron one class to another class using Dependency injection with cucumber
Service layer EJB null pointer exception
Null pointer exception when using @Autowired annotation to inject bean
Null pointer exception using weblogic 10g bean injection jpa/ejb
Null pointer exception thrown when creating a Double to test null check
JDBC Null pointer Exception thrown
Related Tags