Jitesh Sinha

What are the key differences between Android and web development conceptually? How different a developer's mindset should be in both cases?

Manageability is worst for 2-tier since client contains business logic. There can be any number of clients and managing an unknown number of is certainly more difficult than doing it for a known number.
1-tier and 3-tier :- We know how many hosts will contain business/presentation logic.

Thanks Jeanne!

I see this question in Mark Cade and Humphrey Sheil's book- chapter 3 :-


You have been asked to evaluate multiple web presentation technologies for ABC Corp.Their priorities are future-proofing, tooling support from IDEs and the ability to render multiple versions of the same component for different devices. What do you recommend toABC?
A)Use JSF components as part of a Servlet.
B)Use JSTL and the EL as part of JSP pages
C)Use JSF components as part of JSP pages.
D)Use JSTL and the EL as part of Servlets.


WHy is answer C correct and is better than B?The way answer is explained in the book ,it seems future-proofing and tooling support cannot be achieved by JSTL/EL?Any idea why?

can someone please help with this?I am totally stuck at this issue.

After I turn on INFO for org.hibernate packages ,I see that binding is happening fine.

2013-04-04 20:55:19,741 INFO [(hibernate.cfg.AnnotationBinder)] Binding entity from annotated class: com.xxx.pkit.entities.DocumentDetails
2013-04-04 20:55:19,795 INFO [(cfg.annotations.EntityBinder)] Bind entity com.xxx.pkit.entities.DocumentDetails on table DOCUMENT_DETAILS

What can be the issue?

I am struggling wit this error for hours now.I know it is a simple configuration but somehow it does not work for me.

Here is relevant portion of my applicationcontext.xml :-

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource"><ref local="dataSource"/></property> <property name="configurationClass"> <value>org.hibernate.cfg.AnnotationConfiguration</value> </property> <property name="packagesToScan" value="com.xxx.pkit.entities"/> <property name="hibernateProperties"> <props> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.dialect"> org.hibernate.dialect.Oracle9Dialect </prop> <prop key="connection.pool_size">10</prop> </props> </property> </bean>

I have used both "annotatedClasses" and "packagesToScan" but to no avail.Here is my entity class.



package com.xxx.pkit.entities; import java.io.Serializable; import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; @SuppressWarnings("serial") @Entity @Table(name = "DOCUMENT_DETAILS") public class DocumentDetails extends GenericEntity implements Serializable{ @Column(name = "DOCUMENT_URL") private String documentUrl ; @Column(name = "TAGGED_BY") private String taggedBy ; @Temporal(TemporalType.TIMESTAMP) @Column(name = "DATE_SUBMITTED") private Date dateSubmitted ; @Column(name = "PRIMARY_TAG") private String primaryTag ; @Column(name = "PRIMARY_TAG_PATH") private String primaryTagPath ; @Id @Column(name = "DOCUMENT_DETAILS_ID") private long documentDetailsId ; public String getDocumentUrl() { return documentUrl; } public void setDocumentUrl(String documentUrl) { this.documentUrl = documentUrl; } public String getTaggedBy() { return taggedBy; } public void setTaggedBy(String taggedBy) { this.taggedBy = taggedBy; } public Date getDateSubmitted() { return dateSubmitted; } public void setDateSubmitted(Date dateSubmitted) { this.dateSubmitted = dateSubmitted; } public String getPrimaryTag() { return primaryTag; } public void setPrimaryTag(String primaryTag) { this.primaryTag = primaryTag; } public String getPrimaryTagPath() { return primaryTagPath; } public void setPrimaryTagPath(String primaryTagPath) { this.primaryTagPath = primaryTagPath; } public long getDocumentDetailsId() { return documentDetailsId; } public void setDocumentDetailsId(long documentDetailsId) { this.documentDetailsId = documentDetailsId; } }

problem appears when I try to save anything in that entity.here is Exception stack trace :-


org.hibernate.MappingException: Unknown entity: com.xxx.pkit.entities.Document Details at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFacto ryImpl.java:550) at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:13 38) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId (AbstractSaveEventListener.java:98) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGene ratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187) at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrR

Please help.

Hi Kirk,

I have been working on Java platform for long time now and I am familiar with a few design patterns.My question is how do you go about developing a design pattern specific to an application that will ensure High Availability or scalability for example?
Thanks

It happens with all annotated beans.applicationContext.xml is under WEB-INF/classes. Here is web.xml :-
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>ZBL</display-name> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath:applicationContext-Ajax.xml classpath:applicationContext.xml </param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>zbl</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>dwr-invoker</servlet-name> <servlet-class>org.directwebremoting.spring.DwrSpringServlet</servlet-class> <init-param> <param-name>debug</param-name> <param-value>true</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>zbl</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>zbl</servlet-name> <url-pattern>/service/*</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>dwr-invoker</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> <jsp-config> <taglib> <taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri> <taglib-location>/WEB-INF/tags/c.tld</taglib-location> </taglib> <taglib> <taglib-uri>/spring</taglib-uri> <taglib-location>/WEB-INF/spring.tld</taglib-location> </taglib> </jsp-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>

It seems spring reads projectname-servlet.xml.It does not read applicationContext.xml even if it is mentioned in web.xml .
How does it work?I am totally confused.

Hi All,

I am stuck on this problem for last several hours.I have tried looking everywhere but this problem would not go away.
Here is my entity class :-

package com.abc.zbl.entities; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.SequenceGenerator; import javax.persistence.Table; import javax.xml.bind.annotation.XmlRootElement; @Entity @Table(name = "ZBL_USER_FILTER") @SequenceGenerator(name = "Zuf_Gen", sequenceName = "ZUF_ID_SEQUENCE") @XmlRootElement public class ZblUserFilter { @Id @GeneratedValue(generator = "Zuf_Gen") @Column(name = "ZUF_ID") private long zufId ; @Column(name="USER_NAME") private String userName ; @Column(name = "FILTER", length = 3000) private String filter ; public long getZufId() { return zufId; } public void setZufId(long zufId) { this.zufId = zufId; } public String getFilter() { return filter; } public void setFilter(String filter) { this.filter = filter; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } }

Here is applicationContext.xml :-

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd"> <context:annotation-config/> <context:component-scan base-package="com.abc.zbl"/> <bean id="dataSource" class="com.abc.zbl.dao.ZblDataSource"> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource"><ref local="dataSource"/></property> <property name="packagesToScan" value="com.abc.zbl.entities" /> <property name="configurationClass"> <value>org.hibernate.cfg.AnnotationConfiguration</value> </property> <property name="annotatedClasses"> <list> <value>com.abc.zbl.entities.User</value> <value>com.abc.zbl.entities.PageView</value> <value>com.abc.zbl.entities.PageEvent</value> <value>com.abc.zbl.entities.ZblFilterMapping</value> <value>com.abc.zbl.entities.ZblRuleMapping</value> <value>com.abc.zbl.entities.ZblUserFilter</value> </list> </property> <property name="hibernateProperties"> <props> <!--prop key="hibernate.hbm2ddl.auto">validate</prop --> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.dialect"> org.hibernate.dialect.Oracle9Dialect </prop> <prop key="hibernate.default_schema">zbluser_admin</prop> <prop key="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</prop> <prop key="hibernate.connection.password">xxxxxxx</prop> <prop key="hibernate.connection.url">jdbc:oracle:thin:@xxx:xxx:xxxxx</prop> <prop key="connection.pool_size">20</prop> </props> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass"><value>org.springframework.web.servlet.view.JstlView</value></property> <property name="prefix"><value>/WEB-INF/jsp/</value></property> <property name="suffix"><value>.jsp</value></property> </bean> </beans>

Java code that is giving problem is here :-
@Service(value = "zblServiceImpl") @Transactional public class ZblServiceImpl implements ZblService { @Autowired protected UserDao userDao; @Autowired protected FilterDao filterDao; @Autowired protected ZblDao zblDao; @Override public String saveFilters(String userName,String filters) { ZblUserFilter filter = new ZblUserFilter() ; filter.setUserName(userName) ; filter.setFilter(filters) ; filterDao.persist(filter) ; return "true" ; } }
error comes on filterDao.persist(filter) ;

persist method has this code snippet :-
@Override public T persist(T o) { super.getHibernateTemplate().persist(o); return o; }
Here is the exception stack trace :-

org.hibernate.MappingException: Unknown entity: com.abc.zbl.entities.ZblUserFilter at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550) at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338) at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:180) at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:512) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:70) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:38) at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:618) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:592) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:596) at org.springframework.orm.hibernate3.HibernateTemplate$21.doInHibernate(HibernateTemplate.java:796) at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406) at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374) at org.springframework.orm.hibernate3.HibernateTemplate.persist(HibernateTemplate.java:793) at com.abc.zbl.dao.GenericDaoImpl.persist(GenericDaoImpl.java:58) at com.abc.zbl.service.ZblServiceImpl.saveFilters(ZblServiceImpl.java:68) at com.abc.zbl.controller.ZblFilterController.saveFilters(ZblFilterController.java:35)

Can someone please help?Thanks!

Oracle version is 9.
Only difference from the example that you mentioned is execute instead of executeQuery on CallableStatement object.
Can that be the issue?

can someone please respond to this?Thanks.

Guyz,
I have spent several days trying to do this but have not been successful.I need to call an Oracle stored procedure from my java code.
My stored procedure looks like this :-

create or replace
PROCEDURE GET_GROUP_DATA(P_CURSOR OUT sys_refcursor) AS

L_CATEGORY VARCHAR2(250);
L_GOAL NUMBER;
L_MONTH_TO_DATE NUMBER;
L_STATUS VARCHAR2(50);


BEGIN
OPEN P_CURSOR for

SELECT
T1.CATEGORY
, T1.GOAL
, T1.MONTH_TO_DATE
,T1.status
from T1 ;

end get_group_data;


Here is my Java code :-
public String getMonthlyProgressData() { Session session = getSession() ; Connection conn = session.connection() ; ResultSet rs = null ; ResultSet rs1 = null ; CallableStatement cstmt = null ; String str = "" ; try{ cstmt = conn.prepareCall("CALL GET_GROUP_DATA(?)") ; cstmt.registerOutParameter(1,OracleTypes.CURSOR) ; cstmt.executeQuery() ; //log.debug("Result set first "+rs.getArray(1)) ; rs = (ResultSet)cstmt.getObject(1) ; while(rs.next()) { str = rs.getString(1) ; } } catch(SQLException sqex) { log.debug("sqex " +sqex.toString()) ; sqex.printStackTrace() ; } finally{ try{ if(rs!= null) rs.close() ; if(cstmt != null) cstmt.close(); if(conn != null) conn.close() ; } catch(SQLException sqex) { log.debug("exception in finally "+sqex) ; } } return str ; }

Here is the error that I get - java.sql.SQLException: ORA-06553: PL**S*(ignore all *)-306: wrong number or types of arguments in call to 'GET_GROUP_DATA'.

The error message does not have * - but Javaranch thinks I am using abbreviation for PLEASE - so I had to put in * in the middle.
Please help me guyz.Thanks!

Hi Folks,

I have searched a lot on internet trying to find sample code for my requirement.The closest solution to my problem that I can find is -
Entity @Table(name = "APPL_USER") @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorFormula(value = "SUBSCRIBER_IND") @DiscriminatorValue("N") @NamedQuery(name = "req.all", query = "select n from Requestor n") @org.hibernate.annotations.NamedNativeQuery(name = "SP_APPL_USER", query = "call SP_APPL_USER(?, :eid)", callable = true, readOnly = true, resultClass = Requestor.class) public class Requestor { @Id @Column(name = "EMPL_ID") public String getEmpid() { return empid; } public void setEmpid(String empid) { this.empid = empid; }

The part that bothers me is the resultClass attribute inside org.hibernate.annotations.NamedNativeQuery annotation.I don't have any class for this attribute since my stored procedure is going to return 2 dimensional array.Is it even possible to call this kind of stored procedure from hibernate code?