My first attempt to run Flex compiler on Ubuntu

Today I tried creating my first Flex application, so I downloaded Flex 2 SDK from Adobe website and extracted it on my just-installed Ubuntu. Then, I started to search a tutorial of Hello World program on the Internet and found one. After gradually following his steps, I got an error while the problem is being compiled by Flex compiler.

$ mxmlc first.mxml
Loading configuration file /usr/local/flex2/frameworks/flex-config.xml
Segmentation fault (core dumped)
$

I had no idea why mxmlc crashed whenever I tried to compile a mxml file. Finally, I found an article stating about this problem in LaunchPad. As a result, I did what he said immediately and it's perfect. There is no problem anymore.

According to the article, the problem is that Ubuntu’s default JRE doesn’t like Flex SDK. Thus, I need to download a new JDK from Sun or others. The instructions below is the steps to install JDK. Please be noticed on step 4, since it's very important. In my case, even though I chose to follow the option 1, I still need to do step 4 of the option 2.

How to Install JDK (Refer to Space Program Blog)

1. Option 1:
1. run: sudo apt-get install sun-java5-jdk
2. Option 2: (if option 1 doesn't work)
1. download jdk 1.5 from sun, the Self extracting linux version, .bin extension (NOT rpm)
2. run: sudo apt-get java-package
3. run: fakeroot jdk***.bin
4. run: sudo update-alternatives --config java
   - select the j2sdk1.5-sun option
5. run: java -version
   - just to make sure it's the new version