Here a link that explains the java.lang.ClassFormatError:
http://craftingjava.blogspot.co.il/2012/07/reason-for-javalangclassformaterror.html
--------------------
"this error would be thrown when the java virtual machine attempts to read a class file and founds that the class file has been altered in such a way that it loses its integrity."
Here they are trying to say that "if a class file has been modified in a complicated way then this error would be thrown."
There may be two possible ways a class file can get corrupted as far i know.
1.May be the compiler have some unresolved bugs in it.
2.The programmer may intentionally change the class file for some reasons.----------------------
In your case this error does not seem to depend on your code.
So, I can suggest you to use Oracle JDK instead OpenJDK, this because I had some problems using NetBeans and then I got that suggestion, that helped me.
Angelo
On Tue, Jan 27, 2015 at 1:35 AM, Kevin Cummings <cummings@xxxxxxxxxxxxxxxxxx> wrote:
I updated to java-1.7.0-openjdk.x86_64 1:1.7.0.75-2.5.4.2.fc20 today
(along with the java-1.7.0-openjdk-headless and java-1.7.0-openjdk-devel
packages). After the upgrade, nothing java related would run. (not the
compiler, not the jar command, and I couldn't run any pre-built .jars.)
The error was:
> Error occurred during initialization of VM
> java/lang/ClassFormatError: Unknown constant tag 99 in class file java/lang/Class
Downgrading back to java-1.7.0-openjdk.x86_64 1:1.7.0.60-2.4.3.0.fc20 et
al fixed the problem.
--
Kevin J. Cummings
kjchome@xxxxxxxxxxx
cummings@xxxxxxxxxxxxxxxxxx
cummings@xxxxxxxxxxxxxxxxxxxxxxx
Registered Linux User #1232 (http://www.linuxcounter.net/)
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