You need to enclose that in &lt;%!  %&gt; as follows:

    &lt;%!
    
    public String getQuarter(int i){
    String quarter;
    switch(i){
            case 1: quarter = &quot;Winter&quot;;
            break;
    
            case 2: quarter = &quot;Spring&quot;;
            break;
    
            case 3: quarter = &quot;Summer I&quot;;
            break;
    
            case 4: quarter = &quot;Summer II&quot;;
            break;
    
            case 5: quarter = &quot;Fall&quot;;
            break;
    
            default: quarter = &quot;ERROR&quot;;
    }
    
    return quarter;
    }
    
    %&gt;

You can then invoke the function within scriptlets or expressions:

    &lt;%
         out.print(getQuarter(4));
    %&gt;
    
**or**

    &lt;%= getQuarter(17) %&gt;



What are the best practices for creating exceptions? I just saw this, and I don&#39;t know if I should be horrified, or like it. I read several times in books that exceptions should never ever hold a string, because strings themselves can throw exceptions. Any real truth to this?

Basically from my understanding from the scripts is that this was done so all the inhouse Python libraries will have a common error message format (something that is desperately needed) so I can understand why putting the error message string is a good idea. (Almost every method throws exceptions due to the utter need for nothing invalid getting through).

The code in question is the following:

    &quot;&quot;&quot;
	Base Exception, Error
    &quot;&quot;&quot;
    class Error(Exception):
        def __init__(self, message):
            self.message = message

        def __str__(self):
            return &quot;[ERROR] %s\n&quot; % str(self.message)

        def log(self):
            ret = &quot;%s&quot; % str(self.message)
            if(hasattr(self, &quot;reason&quot;)):
                return &quot;&quot;.join([ret, &quot;\n==&gt; %s&quot; % str(self.reason)])
            return ret

    class PCSException(Error):
        def __init__(self, message, reason = None):
            self.message = message
            self.reason = reason
        def __str__(self):
            ret = &quot;[PCS_ERROR] %s\n&quot; % str(self.message)
            if(self.reason != None):
                ret += &quot;[REASON] %s\n&quot; % str(self.reason)
            return ret

This is just the tip of the iceberg, but can someone give me some insight in what makes this a terrible idea? Or if there is a much better exception coding process/style.

Best Practices for Python Exceptions?

normally when you touch the text input area, the keyboard pops up and when you touch the empty area of screen, the keyboard disappeared. How to make that happen?

just like what we experienced on iphone safari...

Thank you

how to hide the keyboard when empty area is touched on iphone

I come from PHP world, where declaring a function in the middle of a php page is pretty simple.
I tried to do the same in JSP:

    public String getQuarter(int i){
	String quarter;
	switch(i){
		case 1: quarter = &quot;Winter&quot;;
		break;
		
		case 2: quarter = &quot;Spring&quot;;
		break;
		
		case 3: quarter = &quot;Summer I&quot;;
		break;
		
		case 4: quarter = &quot;Summer II&quot;;
		break;
		
		case 5: quarter = &quot;Fall&quot;;
		break;
		
		default: quarter = &quot;ERROR&quot;;
	}
	
	return quarter;
    }

I get the following error:

    An error occurred at line: 20 in the jsp file: /headers.jsp
    Illegal modifier for the variable getQuarter; only final is permitted return;
    


Declaring functions in JSP?

I come from PHP world, where declaring a function in the middle of a php page is pretty simple.
I tried to do the same in JSP:
<pre><code class="hljs language-ini">public String getQuarter(int i){
String quarter;
switch(i){
	case 1: quarter = "Winter";
	break;
	
	case 2: quarter = "Spring";
	break;
	
	case 3: quarter = "Summer I";
	break;
	
	case 4: quarter = "Summer II";
	break;
	
	case 5: quarter = "Fall";
	break;
	
	default: quarter = "ERROR";
}

return quarter;
}
</code></pre>
I get the following error:
<pre><code class="hljs language-kotlin">An error occurred at line: 20 in the jsp file: /headers.jsp
Illegal modifier for the variable getQuarter; only final is permitted return;
</code></pre>

How can I check the size of a collection with JSTL?

Something like:

    &lt;c:if test=&quot;${companies.size() &gt; 0}&quot;&gt;
    
    &lt;/c:if&gt;

Check a collection size with JSTL

I have a Map keyed by Integer. Using EL, how can I access a value by its key?

    Map&lt;Integer, String&gt; map = new HashMap&lt;Integer, String&gt;();
    map.put(1, &quot;One&quot;);
    map.put(2, &quot;Two&quot;);
    map.put(3, &quot;Three&quot;);

I thought this would work but it doesn&#39;t (where map is already in the request&#39;s attributes):

    &lt;c:out value=&quot;${map[1]}&quot;/&gt;

**Follow up:** I tracked down the problem. Apparently `${name[1]}` does a map lookup with the number as a `Long`. I figured this out when I changed `HashMap` to `TreeMap` and received the error:

    java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long

If I change my map to be:

    Map&lt;Long, String&gt; map = new HashMap&lt;Long, String&gt;();
    map.put(1L, &quot;One&quot;);

then `${name[1]}` returns &quot;One&quot;. What&#39;s with that? Why does `&lt;c:out&gt;` treat a number as a long. Seems counterintuitive to me (as int is more commonly used than long).

So my new question is, is there a EL notation to access a map by an `Integer` value?

EL access a map value by Integer key

What are the scoping rules for variables in a jsp page with pages added to them using &lt;jsp:include&gt; tags?

My understanding is that an included page is essentially copied verbatim into the page, which would lead me to assume that if I&#39;ve declared a variable in a Parent JSP that it would be available in the child ones.

However Eclipse complains about this (understandably because I could feasibly include the pages in any page or use them as stand alone. And when I try to start the tomcat server it fails to start.

I basically want to get a couple of variables from the session in the parent page and use them in the child pages. This doesn&#39;t work.

So I&#39;ve struck ont he idea of getting them from the session in each of the child pages, however I was wondering if I could give them all the same variable names, or if I&#39;d have to pick different variable names for them in each page so they didn&#39;t clash.


Also what about imports if I import log4net in the parent jss do I also have to import it in the child ones?

Variables in jsp pages with &quot;included&quot; pages

I have a Java EE project which build fine with Ant, deploys perfectly to JBoss, and runs without any trouble. This project includes a few **custom** tag libraries (which is not [JSTL][1]!), which are also working without any difficulties.

The problem is with the Eclipse IDE (Ganymede): in every single JSP file which uses our custom tags, the JSP parser flags the taglib include line with with this error:

`Cannot find the tag library descriptor for (example).tld`

This also causes every use of the tab library to be flagged as an error, and since the IDE doesn&#39;t have their definition, it can&#39;t check tag parameters, etc.

Our perfectly-working JSP files are a sea of red errors, and my eyes are beginning to burn.

How can I simply tell Eclipse, &quot;The tag library descriptor you are looking for is &quot;src/web/WEB-INF/(example)-taglib/(example).tld&quot;?

I&#39;ve already asked this question on the Eclipse support forums, with no helpful results.


  [1]: https://stackoverflow.com/tags/jstl/info

Eclipse &quot;cannot find the tag library descriptor&quot; for custom tags (not JSTL!)

At work I&#39;ve been tasked with turning a bunch of `HTML` files into a simple `JSP` project. It&#39;s really all static, no serverside logic to program. I should mention I&#39;m completely new to Java. JSP files seem to make it easy to work with common includes and variables, much like `PHP`, but I&#39;d like to know a simple way to get something like template inheritance (`Django` style) or at least be able to have a base.jsp file containing the header and the footer, so I can insert content later.

*Ben Lings* seems to offer some hope in his answer here:
https://stackoverflow.com/questions/490390/jsp-template-inheritance
Can someone explain how to achieve this?

Given that I don&#39;t have much time I think dynamic routing is a little much, so I&#39;m happy to just to have URLs map directly onto `.jsp` files, but I&#39;m open to suggestion.

*Thanks.*

**edit:** I don&#39;t want to use any external libraries, because it would increase the learning curve for myself and others who work on the project, and the company I work for has been contracted to do this.

**Another edit:** I&#39;m not sure if `JSP tags` will be useful because my content doesn&#39;t really have any template variables. What I need is a way to be able to do this:

`base.html:`

    &lt;html&gt;&lt;body&gt;
    { content.body }
    &lt;/body&gt;&lt;/html&gt;

`somepage.html`

    &lt;wrapper:base.html&gt;
    &lt;h1&gt;Welcome&lt;/h1&gt;
    &lt;/wrapper&gt;

with the output being:

    &lt;html&gt;&lt;body&gt;
    &lt;h1&gt;Welcome&lt;/h1&gt;
    &lt;/body&gt;&lt;/html&gt;

I think this would give me enough versatility to do everything I need. It could be achieved with `includes` but then I would need a top and a bottom include for each wrapper, which is kind of messy.

JSP tricks to make templating easier?

How can I find the number of arguments of a Python function? I need to know how many normal arguments it has and how many named arguments.

Example:

    def someMethod(self, arg1, kwarg1=None):
        pass

This method has 2 arguments and 1 named argument.

How can I find the number of arguments of a Python function?

I&#39;m trying to figure out Python lambdas. Is `lambda` one of those &quot;interesting&quot; language items that in real life should be forgotten? 

I&#39;m sure there are some edge cases where it might be needed, but given the obscurity of it, the potential of it being redefined in future releases (my assumption based on the various definitions of it) and the reduced coding clarity - should it be avoided?  

This reminds me of overflowing (buffer overflow) of C types - pointing to the top variable and overloading to set the other field values.  It feels like sort of a techie showmanship but maintenance coder nightmare.


How are lambdas useful?

I would like a JavaScript function to have optional arguments which I set a default on, which get used if the value isn&#39;t defined (and ignored if the value is passed). In Ruby you can do it like this:

    def read_file(file, delete_after = false)
      # code
    end

Does this work in JavaScript?

    function read_file(file, delete_after = false) {
      // Code
    }


Set a default parameter value for a JavaScript function

I have created a Queue class in javascript and I would like to store functions as data in a queue. That way I can build up requests (function calls) and respond to them when I need to (actually executing the function).

Is there any way to store a function as data, somewhat similar to

    .setTimeout(&quot;doSomething()&quot;, 1000);

except it would be

    functionQueue.enqueue(doSomething());

Where it would store doSomething() as data so when I retrieve the data from the queue, the function would be executed.

I&#39;m guessing I would have to have doSomething() in quotes -&gt; &quot;doSomething()&quot; and some how make it call the function using a string, anyone know how that could be done?


How do I store javascript functions in a queue for them to be executed eventually

I got a string like:

    settings.functionName + &#39;(&#39; + t.parentNode.id + &#39;)&#39;;

that I want to translate into a function call like so:

    clickedOnItem(IdofParent);

This of course will have to be done in JavaScript.  When I do an alert on `settings.functionName + &#39;(&#39; + t.parentNode.id + &#39;)&#39;;` it seems to get everything correct.  I just need to call the function that it would translate into.

Legend:

    settings.functionName = clickedOnItem
    
    t.parentNode.id = IdofParent

Content Type	Original Author	Original Content on Stackoverflow
Question	Nathan H	View Question on Stackoverflow
Solution 1 - Jsp	karim79	View Answer on Stackoverflow

Declaring functions in JSP?

Jsp Problem Overview

Jsp Solutions

Solution 1 - Jsp

how to hide the keyboard when empty area is touched on iphone

Best Practices for Python Exceptions?

Attributions