java.lang.NoClassDefFoundError：无法初始化类java.awt.Component

Question

When I run MATLAB install script in Ubuntu, I get the following exception:

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class java.awt.Component

longer output is available here

I know that it's a Java problem and could potentially be fixed by changing the classpath or something like that but I don't exactly know how.

Any Ideas?

Answer 1

For me this error was fixed when I installed the JRE on my system:

apt-get install default-jre

on Ubuntu 12.04, instead of having MATLAB use its own.

Answer 2

I've been battling this problem for the whole evening as well but I stumbled onto a solution that works for me at least.

After trying to install using the silent installer I got a different error with a bit more information. It turned out that a library was missing (libXtst.so.6). I was able to install that on my Ubuntu system with:

apt-get install libxtst6

After that I tried running the GUI installer (over X forwarding) and it looks like it's going to work now.

Answer 3

For MATLAB R2012a Student Edition, in Ubuntu 14.04, I had to install these prerequisites first:

sudo apt-get install default-jre libxtst6:i386 libXext6:i386 libxi6:i386 libncurses5:i386 libxt6:i386 libxpm4:i386 libxmu6:i386 libxp6:i386

Next I installed/activated per MATLAB's instructions ( sudo ./install ). I answered "yes" when the installer asked to add a symbolic link in /usr/local/bin/

Finally, when launching MATLAB, I have to specify that it run in 32-bit mode:

matlab -glnx86

I assembled those steps from this answer: https://askubuntu.com/questions/363878/how-to-install-32-bit-matlab-in-ubuntu-64-bit

and the Ubuntu MATLAB guide: https://help.ubuntu.com/community/MATLAB

Optional

I didn't want to type the -glnx86 option each time I launch MATLAB, so I replaced the matlab symbolic link in /usr/local/bin/ with a script that automatically specifies the -glnx86 option:

ls -l /usr/local/bin/matlab #note the destination of the symbolic link
sudo mv /usr/local/bin/matlab /usr/local/bin/matlab.bak
#ensure the first path below matches your symbolic link's destination
echo '/usr/local/MATLAB/R2012a_Student/bin/matlab -glnx86  "$@"' | sudo tee /usr/local/bin/matlab
sudo chmod +x /usr/local/bin/matlab

With that, I can type 'matlab' and it launches properly. (The "$@" in the script forwards all input arguments to matlab.) There's probably a more elegant way to accomplish this, but it worked.

I also encountered a "/lib/libc.so.6: not found" error on matlab startup, which I fixed by following this answer .

Answer 4

Installing gnome (sudo apt-get install gnome) fixed this problem for me. I'm sure this was total overkill, but the required libraries are now available.