To quote the [Maven documentation on this](http://maven.apache.org/pom.html#Profiles):

&lt;blockquote&gt;A profile element contains both an optional activation (a profile trigger) and the set of changes to be made to the POM if that profile has been activated. For example, a project built for a test environment may point to a different database than that of the final deployment. &lt;i&gt;Or dependencies may be pulled from different repositories based upon the JDK version used&lt;/i&gt;.&lt;/blockquote&gt;

(Emphasis is mine)

Just put the dependency for the `release` profile inside the profile declaration itself and do the same for `debug`.
&lt;pre&gt;
&amp;lt;profiles&amp;gt;
	&amp;lt;profile&amp;gt;
		&amp;lt;id&amp;gt;debug&amp;lt;/id&amp;gt;
		…
		&amp;lt;dependencies&amp;gt;
			&amp;lt;dependency&amp;gt;…&amp;lt;/dependency&amp;gt;
		&amp;lt;/dependencies&amp;gt;
		…
	&amp;lt;/profile&amp;gt;
	&amp;lt;profile&amp;gt;
		&amp;lt;id&amp;gt;release&amp;lt;/id&amp;gt;
		…
		&amp;lt;dependencies&amp;gt;
			&amp;lt;dependency&amp;gt;…&amp;lt;/dependency&amp;gt;
		&amp;lt;/dependencies&amp;gt;
		…
	&amp;lt;/profile&amp;gt;
&amp;lt;/profiles&amp;gt;
&lt;/pre&gt;

Your groupId, artifactId should be tokenized in your profiles as properties and you can move your dependencies to the generic section.

Is there a way to suppress warnings in Xcode?

For example I am calling an undocumented method and since the method is not in the header I get a warning on compile. I know I can add it to my header to stop the warning, but I am wondering if there is a way other than adding it to the header (so I can keep the headers clean and standard) to suppress the warning? A pragma or something?

Is there a way to suppress warnings in Xcode?

This may be a matter of style, but there&#39;s a bit of a divide in our dev team and I wondered if anyone else had any ideas on the matter...

Basically, we have some debug print statements which we turn off during normal development. Personally I prefer to do the following:

    //---- SomeSourceFile.cpp ----

    #define DEBUG_ENABLED (0)

    ...

    SomeFunction()
    {
        int someVariable = 5;

    #if(DEBUG_ENABLED)
        printf(&quot;Debugging: someVariable == %d&quot;, someVariable);
    #endif
    }

Some of the team prefer the following though:

    // #define DEBUG_ENABLED

    ...

    SomeFunction()
    {
        int someVariable = 5;

    #ifdef DEBUG_ENABLED
        printf(&quot;Debugging: someVariable == %d&quot;, someVariable);
    #endif
    }

...which of those methods sounds better to you and why? My feeling is that the first is safer because there is always something defined and there&#39;s no danger it could destroy other defines elsewhere.

#ifdef vs #if - which is better/safer as a method for enabling/disabling compilation of particular sections of code?

Is it possible to have a different set of dependencies in a maven pom.xml file for different profiles?

e.g.

    mvn -P debug
    mvn -P release

I&#39;d like to pick up a different dependency jar file in one profile that has the same class names and different implementations of the same interfaces.

Different dependencies for different build profiles

Is it possible to have a different set of dependencies in a maven pom.xml file for different profiles?
e.g.
<pre><code class="hljs language-css">mvn -P debug
mvn -P release
</code></pre>
I'd like to pick up a different dependency jar file in one profile that has the same class names and different implementations of the same interfaces.

I am currently investigating how to make a connection to a SQL Server database from my Java EE web application using Windows Authentication instead of SQL Server authentication. I am running this app off of Tomcat 6.0, and am utilizing the Microsoft JDBC driver. My connection properties file looks as follows:

    dbDriver              = com.microsoft.sqlserver.jdbc.SQLServerDriver
    dbUser                = user
    dbPass                = password
    dbServer              = localhost:1433;databaseName=testDb
    dbUrl                 = jdbc:sqlserver://localhost:1433

I have zero problems with connecting to a SQL Server database in this fashion when using SQL Server authentication.

Is there any way I can retrieve the credentials of the user&#39;s Windows Authentication and use __that__ authentication for SQL Server?

__UPDATE__: I know in ASP.net there is a way to set up Windows Authentication for access to the webapp, which is exactly what I am looking for, except I want to pass that token off to SQL Server for access to the database.

Can I connect to SQL Server using Windows Authentication from Java EE webapp?

We&#39;re running a web app on Tomcat 6 and Apache mod_proxy 2.2.3.  Seeing a lot of 502 errors like this:

&gt; Bad Gateway!
&gt; The proxy server received an invalid response from an upstream server.
&gt; 
&gt; The proxy server could not handle the request GET /the/page.do.
&gt;
&gt; Reason: Error reading from remote server
&gt;
&gt; If you think this is a server error, please contact the webmaster.
&gt;
&gt; Error 502 

Tomcat has plenty of threads, so it&#39;s not thread-constrained. We&#39;re pushing 2400 users via JMeter against the app.  All the boxes are sitting inside our firewall on a fast unloaded network, so there shouldn&#39;t be any network problems.  

Anyone have any suggestions for things to look at or try?  We&#39;re heading to tcpdump next.

UPDATE 10/21/08: Still haven&#39;t figured this out. Seeing only a very small number of these under load.  The answers below haven&#39;t provided any magical answers...yet. :)

Bad Gateway 502 error with Apache mod_proxy and Tomcat

In the same spirit of other platforms, it seemed logical to follow up with this question: What are common non-obvious mistakes in Java? Things that seem like they ought to work, but don&#39;t.

I won&#39;t give guidelines as to how to structure answers, or what&#39;s &quot;too easy&quot; to be considered a gotcha, since that&#39;s what the voting is for.

See also:

  - [Perl - Common gotchas][1]
  - [.NET - Common gotchas][2]


  [1]: https://stackoverflow.com/questions/166653/perl-common-gotchas
  [2]: https://stackoverflow.com/questions/66117/aspnet-common-gotchas

Java - Common Gotchas

I realize that since UNIX sockets are platform-specific, there has to be some non-Java code involved.  Specifically, we&#39;re interested in using JDBC to connect to a MySQL instance which only has UNIX domain sockets enabled.  

It doesn&#39;t look like this is supported, but from what I&#39;ve read it should be at least possible to write a SocketFactory for JDBC based on UNIX sockets *if* we can find a decent implementation of UNIX sockets for Java.  

Has anyone tried this?  Does anyone know of such an implementation?

UNIX socket implementation for Java?

I&#39;ve always been able to allocate 1400 megabytes for Java SE running on 32-bit Windows XP (Java 1.4, 1.5 and 1.6).

    java -Xmx1400m ...

Today I tried the same option on a new Windows XP machine using Java 1.5\_16 and 1.6.0\_07 and got the error:

    Error occurred during initialization of VM
    Could not reserve enough space for object heap
    Could not create the Java virtual machine.

Through trial and error it seems 1200 megabytes is the most I can allocate on this machine.

Any ideas why one machine would allow 1400 and another only 1200?

Edit: The machine has 4GB of RAM with about 3.5GB that Windows can recognize.

Java maximum memory on Windows XP

How can you depend on test code from another module in Maven?  

Example, I have 2 modules:

* Base
* Main

I would like a test case in Main to extend a base test class in Base.  Is this possible?

Update: Found an [acceptable answer][1], which involves creating a test jar.


  [1]: https://stackoverflow.com/questions/174560/sharing-test-code-in-maven#174670

Sharing Test code in Maven

My team uses an internal team maven repo that is shared from a development server using Apache. We also run the Continuum CI server on the same machine. Maven builds in Continuum are run with the &quot;install&quot; goal, which copies the final artifact directly into the shared directory.

The question is, what is the difference between adding files to the shared repo using `mvn install` and using the deploy goal (mvn-deploy plugin)?

It seems to me that using `mvn deploy` creates additional configuration hassles, but I have read somewhere that installing files into a shared repo is a bad idea for some reason related to the internal workings of maven.

update: I get the functional differences between `deploy` and `install`; I am actually more interested in the low level details in terms of what files are created in the maven repo.

What is the difference between &quot;mvn deploy&quot; to a local repo and &quot;mvn install&quot;?

I just realized from an article in CACM that Doxygen works with Java (and several other languages) too. But Java has already the Javadoc tool. Can someone explain what are the pros and cons of either approach? Are they mutually exclusive? Is there a Maven plugin for Doxygen?

Doxygen vs Javadoc

i would like to release a snapshot project &#39;foo-1.0-SNAPSHOT&#39; using the maven release plugin. The project depends on a 3rd party module &#39;bar-1.0-SNAPSHOT&#39; which is not released yet.
I use the option &#39;allowTimestampedSnapshots&#39; in my project&#39;s pom.xml to allow timestamped snapshots but i assume that the 3rd party module (bar) is not timestamped unless i build it myself as maven still complains about unresolved SNAPSHOT dependencies.

Is there a way to release the project foo regardless of dependent SNAPSHOT projects and if not how could i add a timestamp to the 3rd party project?


 

how to release a project which depends on a 3rd party SNAPSHOT project in maven

Is there a way to compile multiple java source directories in a single maven project? 

Maven compile with multiple src directories

&gt; **Possible Duplicate:**  
&gt; [What are the obj and bin folders (created by Visual Studio) used for?](https://stackoverflow.com/questions/5308491/what-are-the-obj-and-bin-folders-created-by-visual-studio-used-for)  

&lt;!-- End of automatically inserted text --&gt;

The default output path for any project is Visual studio is **`bin/Debug`**, but I have noticed that `obj` folder is also generated which again contains `dll` and `pdb` files. Can someone tell me why is this folder generated?

What is obj folder generated for?

Does anyone know how to tell VS(2008) where to save the obj folder when building the solution? We have it save the bin folder to another path in order to keep the source file folders small (ie. emailable), but can&#39;t find any way to tell it to do the same with obj...

VisualStudio: How to save the obj folder somewhere else

I am working on an open source C++ project, for code that compiles on Linux and Windows. I use CMake to build the code on Linux. For ease of development setup and political reasons, I must stick to Visual Studio project files/editor on Windows (I can&#39;t switch to [Code::Blocks][1], for example). I see instructions to generate Visual Studio files using CMake, as [here][2].

Have you used CMake to generate Visual Studio files before? How has been your experience? Suppose I want to add a new file to my project. What is the workflow for this?

  [1]: http://en.wikipedia.org/wiki/Code::Blocks
  [2]: http://www.opentissue.org/mediawiki/index.php/Using_CMake


Using CMake to generate Visual Studio C++ project files

Most Stackoverflow answers that I have found in regards to the Perl build process and unit testing and code coverage simply point me to CPAN for the documentation there.  There&#39;s absolutely nothing wrong with pointing to CPAN modules because that&#39;s where the full documentation is supposed to reside.  I&#39;ve had trouble finding complete working code examples in many cases, though.  

I&#39;ve been searching all over the Internet for actual working code samples that I can download or paste into my IDE, like your typical tutorial &quot;Hello World&quot; example source code, but of an example that demonstrates the build process with unit testing and code coverage analysis.  Does anyone have a small example of a complete working project that demonstrates these technologies and processes?  

*(I do have a small working example and I will answer my own question with it, but there are probably other SO users who have better examples than the ones I came up with.)*


Perl build, unit testing, code coverage: A complete working example

A few years ago, I read the [Recursive Make Considered Harmful](http://aegis.sourceforge.net/auug97.pdf) paper and implemented the idea in my own build process.  Recently, I read another article with ideas about how to [implement non-recursive `make`](http://sites.e-advies.nl/nonrecursive-make.html).  So I have a few data points that non-recursive `make` works for at least a few projects.

But I&#39;m curious about the experiences of others.  Have you tried non-recursive `make`?  Did it make things better or worse?  Was it worth the time?

What is your experience with non-recursive make?

I am trying to run some unit tests in a C# Windows Forms application (Visual Studio 2005), and I get the following error:

&gt; System.IO.FileLoadException: Could not load file or assembly &#39;Utility, Version=1.2.0.200, Culture=neutral, PublicKeyToken=764d581291d764f7&#39; or one of its dependencies. The located assembly&#39;s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)**
&gt;
&gt; at x.Foo.FooGO()
&gt;
&gt; at x.Foo.Foo2(String groupName_) in Foo.cs:line 123
&gt;
&gt; at x.Foo.UnitTests.FooTests.TestFoo() in FooTests.cs:line 98**
&gt;
&gt; System.IO.FileLoadException: Could not load file or assembly &#39;Utility, Version=1.2.0.203, Culture=neutral, PublicKeyToken=764d581291d764f7&#39; or one of its dependencies. The located assembly&#39;s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

I look in my references, and I only have a reference to `Utility version 1.2.0.203` (the other one is old).

Any suggestions on how I figure out what is trying to reference this old version of this DLL file?

Besides, I don&#39;t think I even have this old assembly on my hard drive.
Is there any tool to search for this old versioned assembly?


The located assembly&#39;s manifest definition does not match the assembly reference

How do I determine the dependencies of a .NET application? Does [Dependency Walker](http://www.dependencywalker.com/) work with managed apps? I&#39;ve downloaded the latest and tried profiling the app, but it just exits without much of an explanation. If it doesn&#39;t work with .NET, then is there some other tool that would help me debug a run-time DLL loading issue?

How do I determine the dependencies of a .NET application?

Using Maven 2, is there a way I can list out the jar dependencies as just the file names?

    mvn dependency:build-classpath 

can list the jar files, but that will include the full path to their location in my local repository. What I need is essentially just a list of the file names (or the file names that the copy-dependencies goal copied).

So the list I need would be something like

    activation-1.1.jar,antlr-2.7.6.jar,aopalliance-1.0.jar etc...

ideally as a maven property, but I guess, a file such as build-classpath can generate will do.

What I am trying to achieve is writing a `Bundle-ClassPath` to an otherwise manually maintained MANIFEST.MF file for a OSGi bundle. (You shouldn&#39;t need to understand this bit to answer the question.)

To clarify: The question is **not** about how to write manifest headers into the MANIFEST.MF file in a jar (that is easily googleble). I am asking about how to get the data I want to write, namely the list shown above.

List of dependency jar files in Maven

I have the following makefile that I use to build a program (a kernel, actually) that I&#39;m working on. Its from scratch and I&#39;m learning about the process, so its not perfect, but I think its powerful enough at this point for my level of experience writing makefiles.

    AS	=	nasm
    CC	=	gcc
    LD	=	ld
    
    TARGET		=	core
    BUILD		=	build
    SOURCES		=	source
    INCLUDE     =   include
    ASM 		= 	assembly
    
    VPATH = $(SOURCES)
    
    CFLAGS	=	-Wall -O -fstrength-reduce -fomit-frame-pointer -finline-functions \
    			-nostdinc -fno-builtin -I $(INCLUDE)
    ASFLAGS	=	-f elf
    
    #CFILES		=	core.c consoleio.c system.c
    CFILES		=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
    SFILES		=	assembly/start.asm
    
    SOBJS	=	$(SFILES:.asm=.o)
    COBJS	=	$(CFILES:.c=.o)
    OBJS	=	$(SOBJS) $(COBJS)
    
    build : $(TARGET).img
    
    $(TARGET).img : $(TARGET).elf
    	c:/python26/python.exe concat.py stage1 stage2 pad.bin core.elf floppy.img
    
    $(TARGET).elf : $(OBJS)
    	$(LD) -T link.ld -o $@ $^
    
    $(SOBJS) : $(SFILES)
    	$(AS) $(ASFLAGS) $&lt; -o $@
    
    %.o: %.c
    	@echo Compiling $&lt;...
    	$(CC) $(CFLAGS) -c -o $@ $&lt;
    	
    #Clean Script - Should clear out all .o files everywhere and all that.
    clean:
    	-del *.img
    	-del *.o
    	-del assembly\*.o
    	-del core.elf



My main issue with this makefile is that when I modify a header file that one or more C files include, the C files aren&#39;t rebuilt. I can fix this quite easily by having all of my header files be dependencies for all of my C files, but that would effectively cause a complete rebuild of the project any time I changed/added a header file, which would not be very graceful.

What I want is for only the C files that *include* the header file I change to be rebuilt, and for the entire project to be linked again. I can do the linking by causing all header files to be dependencies of the target, but I cannot figure out how to make the C files be invalidated when their included header files are newer.

I&#39;ve heard that GCC has some commands to make this possible (so the makefile can somehow figure out which files need to be rebuilt) but I can&#39;t for the life of me find an actual implementation example to look at. Can someone post a solution that will enable this behavior in a makefile?

EDIT: I should clarify, I&#39;m familiar with the concept of putting the individual targets in and having each target.o require the header files. That requires me to be editing the makefile every time I include a header file somewhere, which is a bit of a pain. I&#39;m looking for a solution that can derive the header file dependencies on its own, which I&#39;m fairly certain I&#39;ve seen in other projects.

How can I have a Makefile automatically rebuild source files that include a modified header file? (In C/C++)

How do I take a jar file that I have and add it to the dependency system in maven 2?  I will be the maintainer of this dependency and my code needs this jar in the class path so that it will compile.

Content Type	Original Author	Original Content on Stackoverflow
Question	izb	View Question on Stackoverflow
Solution 1 - Java	Aleksandar Dimitrov	View Answer on Stackoverflow
Solution 2 - Java		View Answer on Stackoverflow

Different dependencies for different build profiles

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

#ifdef vs #if - which is better/safer as a method for enabling/disabling compilation of particular sections of code?

Is there a way to suppress warnings in Xcode?

Attributions