Question: > 
> **Possible Duplicate:**  
> 
> [Real world use cases of bitwise operators](https://stackoverflow.com/questions/2096916/real-world-use-cases-of-bitwise-operators) 
> 
> 
> 

I'm not quite sure about bitwise operator `&` and `|`, can someone explain to me what exactly these operator do?
I have read tutorial in <http://www.cprogramming.com/tutorial/bitwise_operators.html> yesterday, butIi don't really know if I want to apply it in coding, can someone please give some examples .

Answer: 
There is 'hack' that I use and works fine with maven, eclipse & GF4 hot deployment. Navigate inside your workspace where you have you xhtml project. 
open .project file
edit

```
<buildCommand>
   <name>org.eclipse.m2e.core.maven2Builder</name>
   <arguments></arguments>
</buildCommand>

```

Modify to:

```
<buildCommand>
   <name>org.eclipse.m2e.core.maven2Builder</name>
   <triggers>incremental,</triggers>
   <arguments></arguments>
</buildCommand>

```

It works just fine for, but it might cause weird build issues (haven't tried for a long time so can't really say so use with case.)

============== Another workaround that I tried but run into eclipse/maven bugs==========

I managed to get this to work with eclipse. The steps were the following:

1. Double-click on glassfish->expand Publishing and make sure that you set Automatically publish when resources changes
2. Right-click on the server ->Glassfish and make sure User Jar Archives fro Deployement is unchecked
3. Then make sure you have Project-Build automatically deselected

From what I can tell maven is touching resources on save, so Glassfish restarts.
Hope it helps
If you have installed "Maven Integration for WTP" in your Eclipse, uninstall it (use m2e instead). Doing this, the hot-deployment of WebContent resources such as .xhtml and .css -files was reenabled to me. Unfortunately I don't know the reason for this workaround working.

Anyhow, I am also interested in your question of real hot-deployment (particularly of .java-files).