[Solved] Jetty HTTP 500 "A full JDK (not just JRE) is required"

Today I am deploying Jetty in my machine, my machine configuration is:
OS: windows 7, JDK: jdk1.7.0_25, Jetty: Jetty9
And I have configured JAVA_HOME in system environment and also add %JAVA_HOME%\bin in Path

I can start Jetty:
Java -jar start.jar

And I can see in console it successfully started.
But when I try to access the web application via browser, I met a strange problem:

ERROR:
PWC6345: There is an error in invoking javac.  A full JDK (not just JRE) is required

SOLUTION:

1. Edit jetty.xml which is under the jetty installation folder \etc folder, for example C:\Program Files\jetty-distribution-9.0.5.v20130815\etc

2. Add a section

    org.apache.jasper.compiler.disablejsr199
    true
  

within section

It's a happy world now!
The solution was referring Jetty document: http://wiki.eclipse.org/Jetty/Howto/Configure_JSP

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How to add code snippet in Google Blogger

This blog is interesting because it's a blog about Blogger itself. Google Blogger is powerful but it's not easy to use. As a developer, we often want to add some code snippet in our blog but it's not available in blogger. Fortunately there is a way to do it - The solution is to use:
SyntaxHighlighter (http://alexgorbatchev.com/SyntaxHighlighter/)

Step1: go to blogger dashboard -->Template--> Edit HTML

Step2: In the part, add the codes below to enable SyntaxHighlighter.

http://alexgorbatchev.com/SyntaxHighlighter/manual/brushes/

    
     
     
     
    
 
 
 -->-->

to add more language support, for example SQL, you can add the js below in the codes we added to head section:

3. In the blog you write, edit html, add the codes For example, below is what I put:

And when publish or preview the post, it looks great!

Bingo! We can write more nice posts now.

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[Solved] Chrome Debugger Cannot Modify Local Variable

I found it's strange that Chrome Debugger doesn't allow modify modify local variables. For example:

you have a variable: instanceType, which original value is "VERTICA"
in the console, you write:
instanceType="MAPR"
But when you type instanceType again, it still shows
"VERTICA"

I did some search but found it's a know problem, and yet not be fixed in latest Chrome build. Luckily I found an easy solution, which is to use Canary Chrome:
 https://www.google.com/intl/en/chrome/browser/canary.html

With the debugger tool of Chrome Canary,

Aha, what a happy world!

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Use CURL to test POST RESTful API

I was working one specific task about RESTful API and it took me sometime, and after finish it I think it's worth sharing.

The task is: I need to implement a POST RESTful API, which accepts multiple parameters. And I will make it be able to call by a C++ or shell script.

The API looks like this, and in JAVA codes:

@POST
@Path("updatecache")
public void postCache(@QueryParam("instanceID") String instanceID, @QueryParam("startTime") String startTime, @QueryParam("endTime") String endTime) {
        /*The implementation details are hidden herer*/
}

To test it in POSTMAN

To test it in CURL, it took me really a long time, and

curl -H "user:abc" -H "password:abc" -X POST "http://localhost:8080/dsm/resources/heatmap/updatecache?instanceID=96&startTime=2013-06-29%2000:00:00&endTime=2013-07-02%2010:00:00"

Note: the URL should be double quoted. Because Typing & in the command line means run the preceding command in the background , because of this anything after the & is being treated as a new command.

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Windows 7 Free Partition Tool - EaseUS Partition Master Edition

I have been using Norton Partition Magic since Windows XP era, but on Windows 7 it doesn't work very well. Fortunately there is a good tool which can well replace partition magic for Win7, and the name is:

EaseUS Partition Master Free Edition

You can download it here here or here

For normal users, the free edition is good enough. The features I used most are: 

• Resize/Move partitions to avoid data loss, like extending NTFS system partition without reboot to maximize PC performance
• Create multiple-partitions, delete partition
• Safely merge two adjacent partitions into a bigger one without data loss.

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