Himu\’s Attempt at Blogging

Tidbits from my thoughts

2012 in review

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The WordPress.com stats helper monkeys prepared a 2012 annual report for this blog.

Here’s an excerpt:

4,329 films were submitted to the 2012 Cannes Film Festival. This blog had 56,000 views in 2012. If each view were a film, this blog would power 13 Film Festivals

Click here to see the complete report.

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Written by mhimu

December 31, 2012 at 12:20 pm

Posted in Uncategorized

Multiple Choices in Spring Injection – @Resource, @Autowired and @Inject

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I just came up with this wonderful blog post by David Kessler. Kudos David!

Spring Injection with @Resource, @Autowired and @Inject.

Written by mhimu

April 5, 2012 at 1:35 pm

Posted in Java, spring

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Oracle 11g EM & Password Expiry

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I’ve faced this issue twice now – passwords expired after a certain time by default in Oracle 11g. But this also messes up EM (dbconsole) by locking up SYSMAN (status shown as LOCKED(TIMED)). The following link has the details on how to deal with change of password of SYSMAN and DBSNMP in Enterprise Manager: https://forums.oracle.com/forums/thread.jspa?threadID=1011436

In short:

  1. Reset password and unlock SYSMAN
    1. sqlplus /nolog
    2. conn / as sysdba
    3. alter user sysman identified by <pass>
    4. alter user sysman account unlock
  2. Make EM pick up the change
    1. emctl stop dbconsole
    2. emctl setpasswd dbconsole
    3. emctl secure dbconsole
    4. emctl start dbconsole
  3. Fireup EM and log on using SYS as SYSDBA
    1. EM will ask to change all expired/soon-to-be-expired passwords
  4. For DBSNMP please see the given link above

Written by mhimu

February 6, 2012 at 5:03 pm

Posted in Uncategorized

Spring MVC Error Handling

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This is not a tutorial of any sort. I’m adding this post to record the error-handling techniques of Spring MVC.

Catching

Errors can be caught in two places:

  1. Inside a validator (extended from Validator)
  2. Inside a controller

1. Validator

In the validate() overridden method, we can use two approaches:

a) Using the errors object:

errors.rejectValue(field, code, defaultMessage) → for field errors
errors.reject(code, defaultMessage)  → for global/general errors

b) Using ValidationUtils.rejectXxx(…) methods

2. Controller

In the onSubmit(request, response, command, BindException errors) overridden method:

errors.rejectValue(field, code, defaultMessage) → for field errors
errors.reject(code, defaultMessage)  → for global/general errors

return new ModelAndView(getFormView(), errors.getModel())

getFormView() returns us to the input form. The call to errors.getModel() is crucial here.

Reporting with JSP

<form:form command=”commandNameIfChangeFromDefault”>
<span class=”…”>
<spring:hasBindErrors name=”command”>
<c:forEach items=”${errors.allErrors} var=”error”> <!– or errors.globalErrors or errors.fieldErrors –>
<spring:message code=”${error.code}” text=”${error.defaultMessage}”/>
</c:forEach>
</spring:hasBindErrors>
</span>
</form:form>

Written by mhimu

September 27, 2010 at 3:41 pm

Posted in Java, spring

Spring MVC Tutorial – Using Tiles 2

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This post is also based on my previous work:

  1. Spring MVC Tutorial – Hibernate Integration – build a Spring MVC app using Hibernate from the ground up.
  2. Spring MVC Tutorial – Paging through Hibernate and Selection Handling – add table/list browsing support utilizing paging in Hibernate, add a page navigation bar, add checkbox handling against table rows.

Here I will not add any new functionality – just move the view technology to Tiles 2 that comes bundled with Spring complete distribution.

The new completed project is available as ibank-v3.zip.

Till now, I have repeated header/footer/menu code in all the JSP files. Tiles 2 can be used to remove that repetition. Let’s begin.

Read the rest of this entry »

Written by mhimu

December 9, 2009 at 2:53 pm

Posted in Java, spring

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Spring MVC Tutorial – Paging Through Hibernate and Selection Handling

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In this installment, I’m expanding the project done in Spring MVC Tutorial – Hibernate Integration to include:

  1. Browsing/paging through a table with a navigation bar found in various forum sites and ASP.NET GridView (e.g. First 3 4 5 6 7 Last)
  2. Showing checkboxes against each row of the table for selective action

The related project code download is ibank-v2.zip

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Written by mhimu

November 26, 2009 at 3:31 pm

Spring MVC Tutorial – Hibernate Integration

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After a long gap…

For introduction to Spring MVC in particular, see Spring MVC Tutorial and Spring MVC Tutorial 2.

The project done in STS can be downloaded from my Box.net account. The project libraries you will have to edit to match your setup.

Along with learning to integrate Hibernate, I’ll be introducing some new pieces of Spring MVC.
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Written by mhimu

November 16, 2009 at 2:44 pm

Posted in Java, spring

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