You should be able to set a break-point, go into debug mode, open the variables views and here change the content of the variables.

![enter image description here][1]


  [1]: http://i.stack.imgur.com/SYlsT.png

You can access variables through the [Variables view][1]. There you can right click on any variable and select &quot;[Change value ...][2]&quot;.

---

**Resources :**

 - [standford.edu - eclipse guide][3]
 - [help.eclipse.org - change var value][4]


  [1]: http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.user/reference/views/variables/ref-variables_view.htm
  [2]: http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.user/reference/views/shared/ref-changevarvalue.htm
  [3]: http://www.stanford.edu/class/cs108/JavaTools/eclipse-guide/
  [4]: http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.user/reference/views/shared/ref-changevarvalue.htm

... and you can do much, much more:-) Just to give you and idea.  
You may change the code during debug which is hot swapped and is effectively changed (recompiled) in given debug session.
You may run given method run (e.g. after catching breakpoint) few times without rerunning debug -&gt; use drop to frame feature on method stack.

After you have changed the code you have to save it (cntrl-S) to make it effective.
You will see your running application respond to the code-change after the cntrl-S

I hope this works for you. it took me some time to figure this out.

Run your application in debug mode then go to variables window. select the parameter then change values according to your requirements. then save (ctrl+s). and go ahead with your changes.  Hope this will help. 

If variables window is missing. then goto eclipse window-&gt;show views-&gt;variables

What is the difference between encasing part of a regular expression in () (parentheses) and doing it in [] (square brackets)?  

How does this:

    [a-z0-9]

differ from this:

    (a-z0-9)

?

What&#39;s the difference between () and [] in regular expression patterns?

Is there an elegant way to turn an array of primitives into an array of the corresponding container objects -- turn a `byte[]` into a `Byte[]`, for example?  Or am I stuck with looping through it and doing it manually?

Yeah, the `for` loop isn&#39;t exactly difficult.  Just kinda ugly.



Converting Array of Primitives to Array of Containers in Java

Using Eclipse, when debugging is it possible to change the value of variables during runtime of a project for testing purposes.

For example, say I have a method that returns the number 5 but for testing purposes i want to output 10 instead. This isn&#39;t the problem I&#39;m facing its a little more complex but its just to get my idea across.


Changing variables in realtime when debugging in eclipse?

<p>Using Eclipse, when debugging is it possible to change the value of variables during runtime of a project for testing purposes.</p>
<p>For example, say I have a method that returns the number 5 but for testing purposes i want to output 10 instead. This isn't the problem I'm facing its a little more complex but its just to get my idea across.</p>


On a question for Java at the university, there was this snippet of code:

    class MyExc1 extends Exception {}
    class MyExc2 extends Exception {}
    class MyExc3 extends MyExc2 {}
    
    public class C1 {
        public static void main(String[] args) throws Exception {
            try {
                System.out.print(1);
                q();
            }
            catch (Exception i) {
                throw new MyExc2();
            }
            finally {
                System.out.print(2);
                throw new MyExc1();
            }
        }
        
        static void q() throws Exception {
            try {
                throw new MyExc1();
            }
            catch (Exception y) {
            }
            finally {
                System.out.print(3);
                throw new Exception();
            }
        }
    }

I was asked to give its output.  I answered `13Exception in thread main MyExc2`, but the correct answer is `132Exception in thread main MyExc1`. Why is it that? I just can&#39;t understand where does `MyExc2` go.

Exception thrown in catch and finally clause

What is the equivalent of a Java long in the context of MySql variables?

Java long to MySql

In my app I need to do a lot of INSERTS. Its a Java app and I am using plain JDBC to execute the queries. The DB being Oracle. I have enabled batching though, so it saves me network latencies to execute queries. But the queries execute serially as separate INSERTs:

    insert into some_table (col1, col2) values (val1, val2)
    insert into some_table (col1, col2) values (val3, val4)
    insert into some_table (col1, col2) values (val5, val6)

I was wondering if the following form of INSERT might be more efficient:

    insert into some_table (col1, col2) values (val1, val2), (val3, val4), (val5, val6)

i.e. collapsing multiple INSERTs into one.

Any other tips for making batch INSERTs faster?


Efficient way to do batch INSERTS with JDBC

What is the best way to save user settings in java desktop app securely? For example If I want to save an Ftp account settings what is the best way to do that?

Thanks

What is the best way to save user settings in java application?

I have this ugly code:

    if ( v &gt; 10 ) size = 6;
    if ( v &gt; 22 ) size = 5;
    if ( v &gt; 51 ) size = 4;
    if ( v &gt; 68 ) size = 3;
    if ( v &gt; 117 ) size = 2;
    if ( v &gt; 145 ) size = 1;
    return size;

How can I get rid of the multiple if statements?

Get rid of ugly if statements

I am starting to develop Android applications. Which version of Eclipse should I use?

I see there are 11 versions. I am confused with these:

 1. Eclipse IDE for Java Developers
 2. Eclipse Classic 3.6.1
 3. Eclipse IDE for Java EE Developers
 4. Pulsar for Mobile Developers


Which Eclipse version should I use for an Android app?

I have created a minimal maven project with a single child module in eclipse helios.

In the src/test/resources folder I have put a single file &quot;install.xml&quot;. In the folder src/test/java I have created a single package with a single class that does:

      @Test
      public void doit() throws Exception {
        URL url = this.getClass().getClassLoader().getResource(&quot;install.xml&quot;);
        System.out.println(url.getPath());
    
      }

but when I run the code as a junit 4 unit test I just get a NullPointerException. This has worked fine a million of times before. Any ideas?

I have followed this guide:

http://www.fuyun.org/2009/11/how-to-read-input-files-in-maven-junit/

but still get the same error.

this.getClass().getClassLoader().getResource(&quot;...&quot;) and NullPointerException

I am trying to run my project, but Eclipse is saying I have errors. But there are no errors, just a red cross where the project name is. I have tried deleting the R.java and generating a new one, but that didn&#39;t work.

Eclipse shows errors but I can&#39;t find them

I can&#39;t seem to debug the tomcat application through Eclipse.  I&#39;ve set 

`CATALINA_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n`

and then I run `bin/catalina.sh`, where I see output saying it&#39;s listening for `dt_socket` on `port 8000`.  But whenever I try to connect to port `8000` in Eclipse (by adding an entry in the remote java application menu), it complains about a refused connect.  Any ideas?

Remote debugging Tomcat with Eclipse

What is the name of the command (or a keyboard shortcut) for jumping to a file in Eclipse?  I&#39;ve seen &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;Shift&lt;/kbd&gt;+&lt;kbd&gt;R&lt;/kbd&gt;, but neither this nor &lt;kbd&gt;Cmd&lt;/kbd&gt;+&lt;kbd&gt;Shift&lt;/kbd&gt;+&lt;kbd&gt;R&lt;/kbd&gt; work on Mac.

What is the keyboard shortcut to go to a file in Eclipse on Mac OS X?

Which is better to use, and why, on a large project:

    #if DEBUG
        public void SetPrivateValue(int value)
        { ... }
    #endif

or

    [System.Diagnostics.Conditional(&quot;DEBUG&quot;)]
    public void SetPrivateValue(int value)
    { ... }

#if DEBUG vs. Conditional(&quot;DEBUG&quot;)

I know you are all going to answer &quot;use a debugging proxy server like Fiddler&quot; but it&#39;s not that simple.

Here&#39;s my situation: I have some code that runs on a server, in an ASP.NET page code-behind (aspx.cs), which (among other things) establishes a connection to _another_ server, grabs some stuff, and then formats it and returns it to the browser.

The problem is that the other server is doing the wrong thing, and so I want to be able to pass a debugging flag into the page (via the query string, e.g. ?debug=true) so that it will print out the _completely raw_ HTTP request that it is sending to the other server so I can see what the heck is wrong.  This code is running in several places so I want to be able to just pass in this flag on dev, staging, or production and just see the request, without having to figure out whether the production servers can talk to some proxy server that exists somewhere, etc.

You would think that it would be easy to do this, right?  So I feel like I&#39;m crazy or something but I looked at the reference for HttpWebRequest and its parent class WebRequest and -- nothing.  No can do.  You would think Microsoft would have thought of this.  The closest thing is that you can access the &quot;Headers&quot; collection but when I tried it, it omitted some really important headers like &quot;content length&quot; -- so it must be &quot;lying&quot; to me (I know it&#39;s lying, because I know for a fact that the remote server is returning a 200 status -- the request is successful, it&#39;s just returning bad/different/wrong data)

Here is the asked-for code example:

    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(&quot;http://www.whatever.com&quot;);
    req.Method = ... whatever ...;
    ... other setup for the request ...
    /* At this point we are about to send the request.
       What does the raw HTTP request look like? */
    HttpWebResponse resp = (HttpWebResponse)req.GetResponse();



How do I see the raw HTTP request that the HttpWebRequest class sends?

When I debug my ASP.NET webapp in VS2010, a dialog appears with the title &quot;Downloading public symbols&quot;.

How do I instruct Visual Studio *not* to attempt this?

Disable VS&#39; &quot;downloading public symbols&quot;

When I got something like this

    ERROR/AndroidRuntime(18677): Caused by: java.lang.NullPointerException
    ERROR/AndroidRuntime(18677):     at com.companyname.a.a.a(Unknown Source)

How can I know where the problem is and debug this issue?
I only got the mapping output from ProGuard and don&#39;t know the line number.
Thanks.


How to debug with obfuscated (with ProGuard) applications on Android?

Something is happening with one of my class&#39;s instance variables. I want to make the variable a property, and whenever it is accessed I want to print out the stack trace of all the code leading up to that point, so I can see where it&#39;s being messed with. How do I print out the stack trace when no exception has been raised? I know if there is an exception I can do something like `traceback.format_tb(sys.exc_info()[2])`.

Also what might be useful is to print only the last 3-4 levels, since the first few are probably not going to be that interesting.

print python stack trace without exception being raised

I thought I was an experienced Maven user, but I am having a mental block on how to do this!

I&#39;ve been able to use the Maven sql plugin to drop, create, and install a schema in a database via plugin executions I&#39;ve defined and bound to the `pre-integration-test` phase.

However, now I&#39;d like to use that same sql plugin to insert some sample data whenever I want from the command line -- that is, not bound to any lifecycle goal.  There are a few different sets of sample data, so I&#39;d like to define a few different executions.

But is there a way to run one of these executions from the command line by using the execution ID perhaps?

Run a single Maven plugin execution?

Using intellij and maven pom files, how do i debug tests run inside the maven test goal?

When i run them directly in the code, it complains something about profiles missing, which i&#39;ve ticked inside intellij&#39;s Maven Projects.

In IntelliJ, how do i debug a maven test goal?

[This fabulous answer](https://stackoverflow.com/questions/717026/how-can-i-test-my-webpage-using-different-browsers/1583030#1583030) suggests there’s no way to run multiple versions of Google Chrome on one machine.

Every now and then you’ll get a website user stuck on an old version of Chrome (no idea how, but it happens — maybe they installed [the standalone version](http://googlesystem.blogspot.com/2009/03/standalone-offline-installer-for-google.html)?) with an issue, and you need to be able to verify it. Bit difficult to do that without their browser version around.

Does anyone know if there’s actually a way to do this? I.e.

1. Obtain an installer for an older version of Google Chrome (Google seems to keep very quiet about versions, which is great for users, less great for developers trying to support old versions)
2. Run two versions of Google Chrome on one machine

Can I run multiple versions of Google Chrome on the same machine? (Mac or Windows)

I need mock some class with final method using mockito. I have wrote something like this 

    @Test
    public void test() {
        B b = mock(B.class);
        doReturn(&quot;bar called&quot;).when(b).bar();   
        assertEquals(&quot;must be \&quot;overrided\&quot;&quot;, &quot;bar called&quot;, b.bar());
        //bla-bla
    }
    
    
    class B {
        public final String bar() {
            return &quot;fail&quot;;
        }
    }
But it fails. 
I tried some &quot;hack&quot; and it works.

       @Test
       public void hackTest() {
            class NewB extends B {
                public String barForTest() {
                    return bar();
                }
            }
            NewB b = mock(NewB.class);
            doReturn(&quot;bar called&quot;).when(b).barForTest();
            assertEquals(&quot;must be \&quot;overrided\&quot;&quot;, &quot;bar called&quot;, b.barForTest());
        }
It works, but &quot;smells&quot;.

So, Where is the right way?

Thanks.



Final method mocking

Reading [this question][1] has helped me solidify some of the problems I&#39;ve always had with unit-testing, TDD, et al.

Since coming across the TDD approach to development I knew that it was the right path to follow. Reading various tutorials helped me understand how to make a start, but they have always been very simplistic - not really something that one can apply to an active project. The best I&#39;ve managed is writing tests around small parts of my code - things like libraries, that are used by the main app but aren&#39;t integrated in any way. While this has been useful it equates to about 5% of the code-base. There&#39;s very little out there on how to go to the next step, to help me get some tests into the main app.

Comments such as &quot;[*Most code without unit tests is built with hard dependencies (i.e.&#39;s new&#39;s all over the place) or static methods.*][2]&quot; and &quot;[*...it&#39;s not rare to have a high level of coupling between classes, hard-to-configure objects inside your class [...] and so on.*][3]&quot; have made me realise that the next step is understanding how to de-couple code to make it testable.

What should I be looking at to help me do this? Is there a specific set of design patterns that I need to understand and start to implement which will allow easier testing?


  [1]: https://stackoverflow.com/questions/67299
  [2]: https://stackoverflow.com/questions/67299#comment-2006643
  [3]: https://stackoverflow.com/questions/67299#answer-67432

Content Type	Original Author	Original Content on Stackoverflow
Question	Julio	View Question on Stackoverflow
Solution 1 - Java	aioobe	View Answer on Stackoverflow
Solution 2 - Java	Colin Hebert	View Answer on Stackoverflow
Solution 3 - Java	Gadolin	View Answer on Stackoverflow
Solution 4 - Java	martie	View Answer on Stackoverflow
Solution 5 - Java	Gaurav Shubham	View Answer on Stackoverflow

Changing variables in realtime when debugging in eclipse?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Solution 4 - Java

Solution 5 - Java

Converting Array of Primitives to Array of Containers in Java

What's the difference between () and [] in regular expression patterns?

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