help interpreting error/ warning messages (installation problem??)

**george27** · 12-30-2011, 10:35 AM

I am using a software program that is built on top of Java and uses Java to run code. I am having a bit of a problem compiling a piece of code. When I try to compile I get a long series of identical warnings: "debugln warning: unknown attribute type in class file: StackMapTable", and after that the error "error writing to *name*.java"
I know the code is correct because it works on a different PC so I was wondering whether there might be an issue with the installation or with some setting... Could anyone help out?

**mwr1976** · 12-30-2011, 10:43 AM

it sounds like you are tying to compile to a different version of java than that which is installed on your computer.Which IDE are you using and what SDK version?

**Norm** · 12-30-2011, 01:27 PM

Those error messages don't sound like they came from the javac compiler program. For example the javac program does not write a .java file: "error writing to *name*.java"

**george27** · 12-30-2011, 10:33 PM

Thanks. I am using jdk1.7.0 and jre7. I have both jre6 and jre7 installed on my pc, do you think that could be part of the problem?

**george27** · 12-30-2011, 10:34 PM

well the error messages are from the program I am using but I think they have something to do with the Java component, because everything else seems to be working..

**Norm** · 12-30-2011, 10:36 PM

the error messages are from the program I am using

Can you look at the program and see why it is outputting those error messages?
Make sure you have a call to the printStackTrace() method in all catch blocks.

**george27** · 01-01-2012, 01:55 PM

Thanks for your replies.
After re-installing Java it is working again now (so no more error message), but still gives all the warnings.

Can you look at the program and see why it is outputting those error messages?
Make sure you have a call to the printStackTrace() method in all catch blocks.

-> I'm going through the program now, I just don't understand why it worked (without warnings) on a different PC...

**quad64bit** · 01-03-2012, 02:03 AM

I'm going through the program now, I just don't understand why it worked (without warnings) on a different PC...

Could be different JRE version. If you use packages from java 1.4.2 on a java 1.4.2 machine, no warnings. Now, move to a java 1.7 machine where those packages are deprecated, and you'll get deprecation warnings and the like. It'll still work, just with warnings.